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3800 series 3 swap wiring harness by quadsource
Started on: 08-09-2018 09:07 AM
Replies: 34 (754 views)
Last post by: Dennis LaGrua on 08-17-2018 11:53 PM
quadsource
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Report this Post08-09-2018 09:07 AM Click Here to See the Profile for quadsourceClick Here to Email quadsourceSend a Private Message to quadsourceEdit/Delete MessageReply w/QuoteDirect Link to This Post
Hello all,

New to the forum. I have a 2008 3800sc donor motor. Is anyone doing the swap harnesses? I see lots of threads, but not sure who/if any are doing them.

Thanks,
Mark
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Dennis LaGrua
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Report this Post08-09-2018 09:20 AM Click Here to See the Profile for Dennis LaGruaClick Here to Email Dennis LaGruaSend a Private Message to Dennis LaGruaEdit/Delete MessageReply w/QuoteDirect Link to This Post
One source:
http://swapspecialties.com/...esses-and-pcms-3800/
Possible second source: Phil Dull/Injection Technology 501-216-7350
Possible other source Phonedawgz on this forum.

------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

[This message has been edited by Dennis LaGrua (edited 08-09-2018).]

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Report this Post08-09-2018 10:04 PM Click Here to See the Profile for quadsourceClick Here to Email quadsourceSend a Private Message to quadsourceEdit/Delete MessageReply w/QuoteDirect Link to This Post
I put in a call this morning. Hopefully they're still doing them. Thanks for the info!

[This message has been edited by quadsource (edited 08-09-2018).]

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Dennis LaGrua
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Report this Post08-10-2018 12:03 PM Click Here to See the Profile for Dennis LaGruaClick Here to Email Dennis LaGruaSend a Private Message to Dennis LaGruaEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by quadsource:

I put in a call this morning. Hopefully they're still doing them. Thanks for the info!



Mark: I would recommend wiring your series III (DBW) engine like a series II and use the cable operated throttle body and a series II PCM. If you are going automatic then you must use the 03 GTP PCM. If you are going stick any year 3800SC series II computer will work but in every case reprogramming is required..

------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

[This message has been edited by Dennis LaGrua (edited 08-12-2018).]

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Report this Post08-11-2018 10:39 PM Click Here to See the Profile for quadsourceClick Here to Email quadsourceSend a Private Message to quadsourceEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Dennis LaGrua:


Mark: I would recommend wiring your series III (DBW) engine like a series II and use the cable operated throttle body and a series II PCM. If you are going automatic then you must use the 04 GTP PCM. If you are going stick any year 3800SC series II computer will work but in every case reprogramming is required..



I have not gotten a reply on the wiring harness. I called twice and emailed this week. I have the pcm and harness that came with the motor..... 08' GTP.

So I have a few areas I'm not sure of:

*Wiring

*Emissions for the 3800 (what to keep / delete)

*Upgrades for the 3800 before install

*What trans to run ( 86 GT auto with shift kit)

*Pulleys and tensioners (plan to keep the AC)

*Engine & trans brackets (spoke with Fierorog)

I have a full fab shop with a hoist. I'm not opposed to buying them since the engineering portion has been done.

Any recommendations would be appreciated.

Thanks,
Mark
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Report this Post08-12-2018 11:03 AM Click Here to See the Profile for qwikgtaClick Here to Email qwikgtaSend a Private Message to qwikgtaEdit/Delete MessageReply w/QuoteDirect Link to This Post
or just do it yourself. remove all the wires from the harness, then using the pinouts off Sinisters web site (http://www.gmtuners.com/) you can run each wire from the sensor to the clip. wire in the stock Fiero wires to/from the C500/C203. Its not that difficult and you get to run the wires where you want them, not where GM put them.

Rob

[This message has been edited by qwikgta (edited 08-12-2018).]

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Dennis LaGrua
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Report this Post08-12-2018 11:23 AM Click Here to See the Profile for Dennis LaGruaClick Here to Email Dennis LaGruaSend a Private Message to Dennis LaGruaEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by quadsource:


I have not gotten a reply on the wiring harness. I called twice and emailed this week. I have the pcm and harness that came with the motor..... 08' GTP.

So I have a few areas I'm not sure of:

*Wiring

*Emissions for the 3800 (what to keep / delete)

*Upgrades for the 3800 before install

*What trans to run ( 86 GT auto with shift kit)

*Pulleys and tensioners (plan to keep the AC)

*Engine & trans brackets (spoke with Fierorog)

I have a full fab shop with a hoist. I'm not opposed to buying them since the engineering portion has been done.

Any recommendations would be appreciated.

Thanks,
Mark


I would not recommend using the 86GT TH125 automatic.It was designed to handle much less power. Even with upgrade mods ( longer clutch pack, shift kit etc) it's still only a three speed box. Much better to use the 4T65eHD that was designed to handle the power. It will give you FAR better mileage as well.
You do realize that the 04-08 3800 engines were drive by wire. You can use that mode of operation but IMO its much harder to get the swap working. You will need the gas pedal module and when programming you will need to deal with the traction control feature. Its been done before but much easier to use the 03 GTP PCM with the earlier cable operated throttle body. If you must do the harness yourself, you can keep everything wired up on the original harness. Just use the GTP power center and just wire in the power, cooling fan, fuel pump and A/C on connections. I did my first one this way and ended up with the PCM behind the drivers seat but it worked perfect.

------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

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Dennis LaGrua
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Report this Post08-12-2018 11:30 AM Click Here to See the Profile for Dennis LaGruaClick Here to Email Dennis LaGruaSend a Private Message to Dennis LaGruaEdit/Delete MessageReply w/QuoteDirect Link to This Post
........

[This message has been edited by Dennis LaGrua (edited 08-12-2018).]

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Report this Post08-12-2018 07:26 PM Click Here to See the Profile for quadsourceClick Here to Email quadsourceSend a Private Message to quadsourceEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Dennis LaGrua:


I would not recommend using the 86GT TH125 automatic.It was designed to handle much less power. Even with upgrade mods ( longer clutch pack, shift kit etc) it's still only a three speed box. Much better to use the 4T65eHD that was designed to handle the power. It will give you FAR better mileage as well.
You do realize that the 04-08 3800 engines were drive by wire. You can use that mode of operation but IMO its much harder to get the swap working. You will need the gas pedal module and when programming you will need to deal with the traction control feature. Its been done before but much easier to use the 03 GTP PCM with the earlier cable operated throttle body. If you must do the harness yourself, you can keep everything wired up on the original harness. Just use the GTP power center and just wire in the power, cooling fan, fuel pump and A/C on connections. I did my first one this way and ended up with the PCM behind the drivers seat but it worked perfect.



I didn't realize the 08' engine TB was DBW. I want it un-complicated as possible so I'll take you advice and go with 03' GTP PCM. Do I need the PCM, TB and the throttle cable assembly? Wiring is not my strong point, but I think I can manage. What do you use for shifting the 4T65eHD? Stock or retro fit the a GTP shifter? Is the stock Fiero PCM still used with the GTP power center?

Thanks again,
Mark

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Report this Post08-12-2018 07:27 PM Click Here to See the Profile for quadsourceClick Here to Email quadsourceSend a Private Message to quadsourceEdit/Delete MessageReply w/QuoteDirect Link to This Post

quadsource

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Member since Aug 2018
 
quote
Originally posted by qwikgta:

or just do it yourself. remove all the wires from the harness, then using the pinouts off Sinisters web site (http://www.gmtuners.com/) you can run each wire from the sensor to the clip. wire in the stock Fiero wires to/from the C500/C203. Its not that difficult and you get to run the wires where you want them, not where GM put them.

Rob



Thanks Rob! I'll check out the site tonight.

Mark
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Report this Post08-12-2018 09:20 PM Click Here to See the Profile for Buck531Click Here to Email Buck531Send a Private Message to Buck531Edit/Delete MessageReply w/QuoteDirect Link to This Post
James Brown on Facebook did my swap harness. It was done very well. Danny Mclloyle (I think?) also does them . I think the price is around $400 but don't quote me.

Best thing to do is search, search, search and when you thought you had it.. search more.

------------------
03 Buick Regal. 13.0x @103
87 Fiero GT. L67, XP, Ported heads, SD headers, FSIC, 2.8 pulley. 12.1@111 1.7 60'.

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Report this Post08-12-2018 11:45 PM Click Here to See the Profile for quadsourceClick Here to Email quadsourceSend a Private Message to quadsourceEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Buck531:

James Brown on Facebook did my swap harness. It was done very well. Danny Mclloyle (I think?) also does them . I think the price is around $400 but don't quote me.

Best thing to do is search, search, search and when you thought you had it.. search more.



I may be interested in getting it done. Do you have contact info?

Thanks,
Mark
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Report this Post08-13-2018 03:58 PM Click Here to See the Profile for OntarioKevSend a Private Message to OntarioKevEdit/Delete MessageReply w/QuoteDirect Link to This Post
You can use the Fiero shifter for the 4t65e-hd transmission. You need to either fab up something or purchase shifter cable adapter to handle the mid engine conversion.

Its been awhile since I researched this (just swapped my Muncie 4 speed to a 4t65e-hd), I am not sure if the 08 transmission works correctly with an 03 or earlier PCM.

Don't waste your money on getting a throttlebody from a l67 engine. Get a 4.9l NorthStar throttlebody, an adapter and an LQ4 MAF, it should be better. Is your donor car a Grand Prix? If so you have the desirable Gen V blower on it.

What are your power goals. There are plenty of upgrades available for the 3800SC, and we can recommend any number of upgrades depending on goals/budget.
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Report this Post08-13-2018 08:33 PM Click Here to See the Profile for Dennis LaGruaClick Here to Email Dennis LaGruaSend a Private Message to Dennis LaGruaEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by OntarioKev:

You can use the Fiero shifter for the 4t65e-hd transmission.
Don't waste your money on getting a throttlebody from a l67 engine. Get a 4.9l NorthStar throttlebody, an adapter and an LQ4 MAF, it should be better. Is your donor car a Grand Prix? If so you have the desirable Gen V blower on it.


Shifter can be used with a new shift cable bracket and either a reversing bellcrank or the shortening of the GTP trans gear selector arm.
As for the throttle body, . It requires using an adapter plate on the series V supercharger. . I prefer the using larger N* TB but again it dd require reprogramming to work correctly as do the use of the LS1 or L4 MAF sensors.
AFAIK the 3800 engine did not have a supercharged version offered in 2008.

------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

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Report this Post08-13-2018 10:19 PM Click Here to See the Profile for quadsourceClick Here to Email quadsourceSend a Private Message to quadsourceEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by OntarioKev:

You can use the Fiero shifter for the 4t65e-hd transmission. You need to either fab up something or purchase shifter cable adapter to handle the mid engine conversion.

Its been awhile since I researched this (just swapped my Muncie 4 speed to a 4t65e-hd), I am not sure if the 08 transmission works correctly with an 03 or earlier PCM.

Don't waste your money on getting a throttlebody from a l67 engine. Get a 4.9l NorthStar throttlebody, an adapter and an LQ4 MAF, it should be better. Is your donor car a Grand Prix? If so you have the desirable Gen V blower on it.

What are your power goals. There are plenty of upgrades available for the 3800SC, and we can recommend any number of upgrades depending on goals/budget.


I was told the motor came from a 2008 GTP. Maybe it was a late 2007 (Dennis)? Either way I guess I could confirm with the serial number.
Power wise: 280-300hp on motor would be a minimum goal. NorthStar TB, L4 mass air and headers would get me close? Recommendations / sources are welcome.
Shifter: Use the stock Fiero shifter and cable with a modified bracket?
Throttle: Use stock Fiero accl cable with NorthStar TB?

Thanks,
Mark
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Report this Post08-13-2018 11:47 PM Click Here to See the Profile for OntarioKevSend a Private Message to OntarioKevEdit/Delete MessageReply w/QuoteDirect Link to This Post
2006+ GTPs had an LS4 V8, the GT models had the 3800SC. In 08 there was only a non SC 3800, and the LS4 available. Do you have a picture of the engine you can post by any chance?

NorthStar throttlebody with an LQ4 MAF (or LS1 either is fine).

I had to make my throttle cable longer, but someone had monkeyed with it before I got the car, so I can't say if a stock cable would work. I wouldn't bother with headers for your power goals. Stock manifolds with a nice free flowing exhaust, autolite 104 spark plugs, and a smaller blower pully, probably 3.5 or 3.4", and obviously a re-tuned PCM.


If you want to make a little more power, bigger injectors, an intercooler and a smaller blower pully, Cam is always nice. But for a modest 280-290whp on a dyno the mods above should do it. If you want a full size intercooler instead of the short stack, it will take some modifications to the read deck lid to fit.

[This message has been edited by OntarioKev (edited 08-13-2018).]

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Report this Post08-14-2018 06:32 PM Click Here to See the Profile for Dennis LaGruaClick Here to Email Dennis LaGruaSend a Private Message to Dennis LaGruaEdit/Delete MessageReply w/QuoteDirect Link to This Post
My Fiero setup is listed below in my signature. As for the throttle cable, I mounted my N* throttle body with the throttle pulley to the front. The stock throttle cable had no problem reaching it. Adding the larger TB and LS1 or LQ4 MAF sensor plus a 3.4" pulley, should free up a few more horsepower but I have found that with the series V supercharger an intercooler was necessary. The stock 3800SC series III engine provides 260HP stock. To reach 300 should not be that hard but you will probably need to change the cam to get there.

------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

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Report this Post08-14-2018 09:23 PM Click Here to See the Profile for OntarioKevSend a Private Message to OntarioKevEdit/Delete MessageReply w/QuoteDirect Link to This Post
On my previous setup I hit 305 whp with a 3.0" pulley, 60lb injectors and a full size intercooler on an l67 with a gen 3 blower. I suspect with a gen V you could do it with a 3.2 or 3.1 pulley. And that's WHP, which is more likely 320 to 325 crank hp. With an intercooler, a cam would not me needed to hit the modest goals of 300 crank hp. Just by getting rid of the factory u-bend the grand prixs are saddled with frees up 5hp or so.
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Report this Post08-14-2018 10:05 PM Click Here to See the Profile for quadsourceClick Here to Email quadsourceSend a Private Message to quadsourceEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by OntarioKev:

On my previous setup I hit 305 whp with a 3.0" pulley, 60lb injectors and a full size intercooler on an l67 with a gen 3 blower. I suspect with a gen V you could do it with a 3.2 or 3.1 pulley. And that's WHP, which is more likely 320 to 325 crank hp. With an intercooler, a cam would not me needed to hit the modest goals of 300 crank hp. Just by getting rid of the factory u-bend the grand prixs are saddled with frees up 5hp or so.


That's all good info, Thanks!

Mark
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Report this Post08-14-2018 10:11 PM Click Here to See the Profile for quadsourceClick Here to Email quadsourceSend a Private Message to quadsourceEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Dennis LaGrua:

My Fiero setup is listed below in my signature. As for the throttle cable, I mounted my N* throttle body with the throttle pulley to the front. The stock throttle cable had no problem reaching it. Adding the larger TB and LS1 or LQ4 MAF sensor plus a 3.4" pulley, should free up a few more horsepower but I have found that with the series V supercharger an intercooler was necessary. The stock 3800SC series III engine provides 260HP stock. To reach 300 should not be that hard but you will probably need to change the cam to get there.



What model car/truck can I find these....
Northstar TB, LS1 MAF?
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quadsource

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Member since Aug 2018
 
quote
Originally posted by Dennis LaGrua:

My Fiero setup is listed below in my signature. As for the throttle cable, I mounted my N* throttle body with the throttle pulley to the front. The stock throttle cable had no problem reaching it. Adding the larger TB and LS1 or LQ4 MAF sensor plus a 3.4" pulley, should free up a few more horsepower but I have found that with the series V supercharger an intercooler was necessary. The stock 3800SC series III engine provides 260HP stock. To reach 300 should not be that hard but you will probably need to change the cam to get there.



I also noticed several different size MAF Sensors. Which is best?

Thanks!
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Report this Post08-14-2018 10:30 PM Click Here to See the Profile for OntarioKevSend a Private Message to OntarioKevEdit/Delete MessageReply w/QuoteDirect Link to This Post
I used an LQ4 MAF, this is the part# when I bought one from Rock Auto. I would not recommend a used MAF.

WALKER PRODUCTS (there are other manufactures as well)
2451107 (245-1107)


I believe any Cadillac with the northstar 4.6 from 00-04 works. I think I got mine from a Seville STS.
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Report this Post08-14-2018 10:37 PM Click Here to See the Profile for hnthompsClick Here to Email hnthompsSend a Private Message to hnthompsEdit/Delete MessageReply w/QuoteDirect Link to This Post
In addition to the cam, intercooler, N* TV, Gen V SC, and a 3??" pulley, you may want to add headers to the vehicle. I currently have a 3800 SC Series III converted to a cable type throttle. I do not have a performance cam (XP) in mine but did use a VS cam for a more streetable vehicle. My intercooler is a ZZP short stack, ZZP fuel logs, and I currently have a 3.4" pulley installed plus a conservative tune. The dyno indicated about 300 ft lbs of torque and just a hair under 300 hp at the wheels. If I do want to modify the tune I have a 3.2" modular pulley that I can use to get some more hp out of the car.



Nelson

[This message has been edited by hnthomps (edited 08-14-2018).]

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Report this Post08-14-2018 10:39 PM Click Here to See the Profile for quadsourceClick Here to Email quadsourceSend a Private Message to quadsourceEdit/Delete MessageReply w/QuoteDirect Link to This Post
Is a 2000 4T65eHD from a GTP a good candidate?

Thanks


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quote
Originally posted by hnthomps:

In addition to the cam, intercooler, N* TV, Gen V SC, and a 3??" pulley, you may want to add headers to the vehicle. I currently have a 3800 SC Series III converted to a cable type throttle. I do not have a performance cam (XP) in mine but did use a VS cam for a more streetable vehicle. My intercooler is a ZZP short stack, ZZP fuel logs, and I currently have a 3.4" pulley installed plus a conservative tune. The dyno indicated about 300 ft lbs of torque and just a hair under 300 hp at the wheels. If I do want to modify the tune I have a 3.2" modular pulley that I can use to get some more hp out of the car.



Nelson



That's looks neat and clean! Someone mentioned a 4.9 NorthStar TB. Is the 4.6 different? I'll check Rock Auto for the MAF sensor.
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Report this Post08-14-2018 10:57 PM Click Here to See the Profile for quadsourceClick Here to Email quadsourceSend a Private Message to quadsourceEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by OntarioKev:

I used an LQ4 MAF, this is the part# when I bought one from Rock Auto. I would not recommend a used MAF.

WALKER PRODUCTS (there are other manufactures as well)
2451107 (245-1107)


I believe any Cadillac with the northstar 4.6 from 00-04 works. I think I got mine from a Seville STS.


New on Amazon 245-1107 about $70.00 shipped.
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Report this Post08-14-2018 11:00 PM Click Here to See the Profile for OntarioKevSend a Private Message to OntarioKevEdit/Delete MessageReply w/QuoteDirect Link to This Post
I typed the 4.9, I meant 4.6 NorthStar.

Yes a 2000 4t65e-hd from a GTP is a great candidate, that's what I am using actually.

You will want both axles from the donor car, as you will use them plus part of a fiero axle to make the passengers side axle for the conversion.

I would also recommend popping the pan off and looking at the internals. A lot of these turn out to have the clutches burned and sometimes other issues. Transmission problems are usually one of the reasons the 3800SC cars are taken off the road.
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quadsource
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Report this Post08-14-2018 11:23 PM Click Here to See the Profile for quadsourceClick Here to Email quadsourceSend a Private Message to quadsourceEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by OntarioKev:

I typed the 4.9, I meant 4.6 NorthStar.

Yes a 2000 4t65e-hd from a GTP is a great candidate, that's what I am using actually.

You will want both axles from the donor car, as you will use them plus part of a fiero axle to make the passengers side axle for the conversion.

I would also recommend popping the pan off and looking at the internals. A lot of these turn out to have the clutches burned and sometimes other issues. Transmission problems are usually one of the reasons the 3800SC cars are taken off the road.


It seems they're trans eaters...
I'll take a look at it before I buy. States rebuilt prior and functions with no issues for $250.00. At least a good core. He also has the both axles.
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Dennis LaGrua
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Report this Post08-15-2018 09:01 AM Click Here to See the Profile for Dennis LaGruaClick Here to Email Dennis LaGruaSend a Private Message to Dennis LaGruaEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by OntarioKev:
I would also recommend popping the pan off and looking at the internals. A lot of these turn out to have the clutches burned and sometimes other issues. Transmission problems are usually one of the reasons the 3800SC cars are taken off the road.


The 4T65eHD is a very strong transmission. Forum member Darkhorizon ran numerous 9 and 10 second quarter mile runs with one. IMO, if the 4T65eHD is failing in a 3800 swap, its because the trans oil temperatures are too high. The trans cooler in the Fiero radiator is just barely adequate for the larger transmission. I run a Champion Radiator and a 180*F thermostat and trans temps stay around that temperature but if you use a higher temp thermostat the trans temps will rise accordingly.

------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

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Report this Post08-15-2018 10:21 AM Click Here to See the Profile for OntarioKevSend a Private Message to OntarioKevEdit/Delete MessageReply w/QuoteDirect Link to This Post
Dennis,

They are great transmissions in the Fiero because we are so much lighter. They often fail in the Grand Prixs though, which is why I recommend looking inside before you install it. For example the one I got was "working great" according to the pervious owner. All the clutches were burned, and a couple of the hard parts needed to be replaced as well.

With 10-20 year old transmissions, its better to look at them before installing to save yourself the time from removing it right away after you complete your swap.
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Report this Post08-15-2018 08:22 PM Click Here to See the Profile for quadsourceClick Here to Email quadsourceSend a Private Message to quadsourceEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Dennis LaGrua:


The 4T65eHD is a very strong transmission. Forum member Darkhorizon ran numerous 9 and 10 second quarter mile runs with one. IMO, if the 4T65eHD is failing in a 3800 swap, its because the trans oil temperatures are too high. The trans cooler in the Fiero radiator is just barely adequate for the larger transmission. I run a Champion Radiator and a 180*F thermostat and trans temps stay around that temperature but if you use a higher temp thermostat the trans temps will rise accordingly.


Thanks for that info!
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quadsource
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Report this Post08-15-2018 08:25 PM Click Here to See the Profile for quadsourceClick Here to Email quadsourceSend a Private Message to quadsourceEdit/Delete MessageReply w/QuoteDirect Link to This Post

quadsource

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Member since Aug 2018
Where is everyone mounting there coil packs? I seen in the battery tray area. However I just replaced mine among other areas in the trunk.

Thanks!
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Report this Post08-15-2018 08:32 PM Click Here to See the Profile for quadsourceClick Here to Email quadsourceSend a Private Message to quadsourceEdit/Delete MessageReply w/QuoteDirect Link to This Post
I noticed you have several block off plates on the upper intake. Also are you running EGR? I'm excited to get started and trying to trim the FAT .
Will I need the Northstar Adapter Plate from ZZP? Will it work with NorthStar and LS1 TB?

Thanks,
Mark

[This message has been edited by quadsource (edited 08-15-2018).]

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OntarioKev
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Report this Post08-15-2018 10:19 PM Click Here to See the Profile for OntarioKevSend a Private Message to OntarioKevEdit/Delete MessageReply w/QuoteDirect Link to This Post
The NorthStar adapter plate works with the NorthStar throttle body, the LS1 is a totally different engine/throttle body.

The ZZP NorthStar adapter kit I believe is sold by the actual manufacturer on ebay for a little less (that's where I got mine)
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Report this Post08-17-2018 11:53 PM Click Here to See the Profile for Dennis LaGruaClick Here to Email Dennis LaGruaSend a Private Message to Dennis LaGruaEdit/Delete MessageReply w/QuoteDirect Link to This Post
The standard easy series III operation uses the 2000-2004 N* throttle body (using the adapter) with either an LQ4 or early LS1 MAF sensor. Just be aware that its not a plug and play job. PCM tuning is required and to start the LS1 or LQ4 MAF table must be imported into the program and fueling tweaked accordingly. If you change tire size then further adjustments are necessary for speedometer calibration and for maintaining proper shift points. Its a job for a professional.

------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

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