I have blown series II 3800. It seems much cheaper for me to find a used series III than series II and I'll get lower miles. Before I go out and buy a 3800 series III, I wanted to double check with people here on the forum if they have encountered any problems in doing this switch. I plan on swapping the intake from the series II to the series III so that I can use series II electronics. Will there be any other challenges such as different brackets, engine mounts, sensors, etc, or will I be able to pull the components from the series II and use them on series III?

It's pretty straight forward. You can keep the aluminum intake if you want to make an adapter for the series II throttle body. You can keep the returnless fuel rail and make the regulator circuit like Darth does. The aluminum oil pan will be fine. If you used the big U shaped bracket from the series II, you will need to notch the bracket in a few places to clear the pan. I had issues with the series III knock sensors, not everyone does.

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Turbo 3800 E85 5spd spec5
11.53@126.7

[This message has been edited by Justinbart (edited 06-16-2011).]

If I use the the plastic intake, that requires me to swap out the lower intake as well correct?

Yes. Make sure you flush the oil out well a few times. If just a tiny bit of water gets in the oil it could be a disaster.

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Turbo 3800 E85 5spd spec5
11.53@126.7

So...I got my new motor and I'm quite pleased. 2008 3800 Series III with 4000 miles. Manifolds, EGR, spark plug wires, and correct oil filter bracket all installed and ready to go. The thing looks brand spankin new. Since the motor is so fresh, I am really really hesitant to remove the intake and related components to put my crappy plastic intake on, So I have a few more questions. If I use the metal intake, is it necessary to use the fuel rail thats already on it (seriesIII) or can I use the fuel rail and injectors off of the series II? if so, that makes it an absolute no brainer for me to keep the metal intake. as I wont have to do any fuel system mods. With regards to the adapter plate. Does anyone have dimensions for it? I have access to aluminum and a cnc at school, so I probably can come up with an adapter plate a lot cheaper than buying one from ZZperformance for a $100.

The series two rail should fit, wont hurt anything to try. I don't have any dimensions on the adapter plate but I did make my own. You will probably need to block the off the brake booster hole. I'm not sure if you can use the s3 MAP sensor. I suppose you could just leave it there unpluged and run your S2 or take it off and plug the hole.


Just an idea for the one I made on the cheap.

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Turbo 3800 E85 5spd spec5
11.53@126.7

why block off the brake booster? that one is the largest vacuum hose on the distribution block on top of the supercharger. doesnt that one just go the fiero hardline in the firewall?

quote Originally posted by americasfuture2k: why block off the brake booster? that one is the largest vacuum hose on the distribution block on top of the supercharger. doesnt that one just go the fiero hardline in the firewall?

I'm not sure how he had it set up before but the aluminum intake has a large port on the back side of the intake. I have always used the large port on the seies 2 throttle body that is on the front side, near the stock fiero location.

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Turbo 3800 E85 5spd spec5
11.53@126.7

My plastic intake also had that large vacuum port on the back side. Its kinda messy, but I was able to run the brake booster line up over the intake to this port. The port on the throttle body goes to fuel pressure regulator and EVAP

Got my motor in. I was just doing some browsing about 3800 series III intake running with series II throttle body. Is there anything that I have to do to get a fully functioning PCV valve. I believe that the inlet for this is the nipple on the top of the intake. currently I just have this plugged off. Will i need to give this a vacuum source or something of the like?

quote Originally posted by FieroFish: Got my motor in. I was just doing some browsing about 3800 series III intake running with series II throttle body. Is there anything that I have to do to get a fully functioning PCV valve. I believe that the inlet for this is the nipple on the top of the intake. currently I just have this plugged off. Will i need to give this a vacuum source or something of the like?

The PCV valve is internal to the intake manifold (located under a removable cover plate) and it has access to manifold vacuum directly via a passage. That nipple you plugged off on the top of the intake is for the crankcase breather passage which is the other half of the PCV system. It is essential that you don't plug that off. If you did, and you didn't run an open element oil cap breather, the crankcase would be sealed and that would allow the PCV to pull a vacuum on your crankcase which could suck in some oil seals and cause some problems for your engine. You can get an open element breather filter that will clamp right onto that nipple on the top of your intake OR you can run a hose from that nipple to your air induction system somewhere between your air filter and throttle body. Make sure you don't just leave it open without some kind of filter on it, because air (and any dust or dirt in the air) will get drawn in there when the engine is running and you don't want that ending up in your engine.

-ryan

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OVERKILL IS UNDERRATED

Custom GM OBD1 & OBD2 Tuning | Engine Conversions & more | www.gmtuners.com

Upgrading to a series III engine is easy. All it takes is an adapter kit sold by ZZ Performance that will mount the N* TB. Then add an LS 1 or LQ4 MAF sensor download the new MAF values to the program table and you're in business.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, 3.4" Pulley, N* TB, LS1 MAF, Flotech Exhaust Autolite 104's Custom CAI 4T65eHD w. custom axles, 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 "

@ Darth: Do you know where I can get one of those clamp on breathers for the intake. I did some searching and cant seem to find any for that application.

@ Dennis: I was unaware of having to do anything with the MAF sensor. will the engine even run without switching that out and reprogramming? and if not where do I come across the correct MAF values to program it with? I live just down the street from ZZperformance, so I could stop there and have them do the reprogramming.

quote Originally posted by FieroFish: @ Darth: Do you know where I can get one of those clamp on breathers for the intake. I did some searching and cant seem to find any for that application. @ Dennis: I was unaware of having to do anything with the MAF sensor. will the engine even run without switching that out and reprogramming? and if not where do I come across the correct MAF values to program it with? I live just down the street from ZZperformance, so I could stop there and have them do the reprogramming.

The 3800SC series II MAF (which is integral with the TB) won't fit on the series III engine w, gen V supercharger. I guess you could make a custom adapter plate but I don't believe that commercially available adapters are available. ZZ might have one though so check with them.. If you cannot fabiricate an adapter plate or buy one, then you can get a N* adapter plate. If you use this then the LQ4 or LS-1 MAF can just fit in the intake air tube and be plugged in (adapter) or wired in. The simple solution is to adpat the series II parts but the perfornace solution is to use the larger N* TB and larger MAF. BTW, ZZ Performance sells the breathers that fit in the oil fill hole.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, 3.4" Pulley, N* TB, LS1 MAF, Flotech Exhaust Autolite 104's Custom CAI 4T65eHD w. custom axles, 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 "

quote Originally posted by Dennis LaGrua: The 3800SC series II MAF (which is integral with the TB) won't fit on the series III engine w, gen V supercharger. I guess you could make a custom adapter plate but I don't believe that commercially available adapters are available. ZZ might have one though so check with them.. If you cannot fabiricate an adapter plate or buy one, then you can get a N* adapter plate. If you use this then the LQ4 or LS-1 MAF can just fit in the intake air tube and be plugged in (adapter) or wired in. The simple solution is to adpat the series II parts but the perfornace solution is to use the larger N* TB and larger MAF. BTW, ZZ Performance sells the breathers that fit in the oil fill hole.

I plan on using the series II throttle body on the series III intake. ZZperformance has an adapter, but I am going to try to fabricate my own first. I have found the breathers that fit in the oil fill hole, but I would prefer one that sits on top of the intake and caps the original crankcase breather hole.

I'm doing a Series III to Series II downgrade right now. I might have some parts you need. I've got a full set of injectors and a throttle body.

quote Originally posted by Rolling Thunder: I'm doing a Series III to Series II downgrade right now. I might have some parts you need. I've got a full set of injectors and a throttle body.

Really the only part that I need is a throttle body adapter to use Series II throttle body on Series III Upper intake

I'm actually going to be just using the pedal assembly thats for the electrical throttle body that comes with the L26. Any downfalls to that?

quote Originally posted by Justinbart: The series two rail should fit, wont hurt anything to try. I don't have any dimensions on the adapter plate but I did make my own. You will probably need to block the off the brake booster hole. I'm not sure if you can use the s3 MAP sensor. I suppose you could just leave it there unpluged and run your S2 or take it off and plug the hole. Just an idea for the one I made on the cheap.

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JSzpotek's 3800NA Series III L26 White 87 Fiero GT

[This message has been edited by JSzpotek (edited 10-02-2011).]

quote Originally posted by JSzpotek: I'm actually going to be just using the pedal assembly thats for the electrical throttle body that comes with the L26. Any downfalls to that?

The throttle control module takes in serial data, it would be interesting to see if it'll work without that input. Here is the diagram for the module:

Thank you for the diagram! I'll be seeing if it works this week/weekend. Waiting on the wiring harness to come in!

quote Originally posted by raccoons: The throttle control module takes in serial data, it would be interesting to see if it'll work without that input. Here is the diagram for the module:

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JSzpotek's 3800NA Series III L26 White 87 Fiero GT

I have these for sell in the mall. Thanks Lonnie