I have the possibility of obtaining what is described as a 3.5L V6 from a Pontiac G6. I'm told the swap is "just like the 3.4 Pushrod motor. I'm suspicious there may be a little more to it.

Can anyone enlighten me on such an engine swap to my '88 with 5 Spd. Getrag? I have the 7730 ECM as well (not yet installed).

Thanks!

I think they meant it is like the 3400 swap.... This is an engine swap like a 3800 or other engine. You do not keep any of your old engine, like the 3.4 swap.

Its the same as the 3400 swap. You will need a whole harness. You can modify one from a early 90s 3.1 obd1 setup cavalier, sunbird, bereTta which use the 7730 pcm. The 3500 is one hell of a motor. There's a lot of guys on v6z24 swapping them into 2nd gen cavaliers pushin some good numbers. I personally contemplated the install but couldn't pass up a good running low miled 3.1 I got for free!

Thanks guys did some more searching and found some good information/advice!

There are also issues with the crank position sensor that need to addressed, you can't just throw a 7730 or standard OBDII ECM at it without additional parts, along with different style sensors in some places as well... this is not just the same as a 3400 swap. But its a good swap none the less.

[This message has been edited by carbon (edited 10-12-2010).]

Actually the 3500 is a little easier sensor wise it doesn't use a crank trigger such as the 3400 it has just the one in the block which is what thwe 7730 ecu is set to read to begin with. Now if going obd2 you will run to problems due to 3400s using the crank trigger

It's the same effort as a 3400 swap except you'll need a manual throttlebody adaptor plate and an internal or external crank trigger wheel all of which can be had from the 60 degree V6 WOT store.

You can not use the stock trigger wheel on the 3500 crank with the 730 ecm.

http://60degreev6.com/forum...9)-swap-into-a-Fiero

[This message has been edited by Joseph Upson (edited 10-12-2010).]

quote Originally posted by kikinz24: Actually the 3500 is a little easier sensor wise it doesn't use a crank trigger such as the 3400 it has just the one in the block which is what thwe 7730 ecu is set to read to begin with. Now if going obd2 you will run to problems due to 3400s using the crank trigger

3500s don't have the 6x with a 7th notch at an offset, they're not the same as the older 3100/3400s

quote Originally posted by kikinz24: Actually the 3500 is a little easier sensor wise it doesn't use a crank trigger such as the 3400 it has just the one in the block which is what the 7730 ecu is set to read to begin with. Now if going obd2 you will run to problems due to 3400s using the crank trigger

You don't know what you are talking about, sorry...

The 3400 has a 7x reluctor on the crank and works directly with the earlier DIS ignition modules which can be controlled from the 7730 or OBDII. The 24x wheel can be ignored with the 7730 but is used with OBDII to smooth out low speed engine operation with more accurate timing...

The 3500 has a fancy pants 52x reluctor on the crank that is tied directly to the stock ECM, which then controls the more basic ignition module used on the 3500. There is no 24x sensor on the 3500.

just for the record - you can use a 3100 or 3400 engine with the top half (everything heads and up) from your Fiero.

here's a link to one already done with good info on what parts make a good combo.

http://www.fierosound.com/34engine/3400details.htm

[This message has been edited by gtxbullet (edited 10-13-2010).]

quote Originally posted by gtxbullet: just for the record - you can use a 3100 or 3400 engine with the top half (everything heads and up) from your Fiero.

Why would you want to do that? You'll basically end up with the equivalent of a 3.4 Camaro engine that only produces about 160hp, maybe a little more - if you put iron heads on one of these newer engines. But by the time you paid for gaskets, hardware, and put your time into swapping everything over, you would probably be better off and dollars ahead just finding a Camaro 3.4 to use in your swap.

The newer generation 3100/3400/3500/3900 engines benefit from having larger port aluminum heads which outflow GM 60 deg V6 iron heads, hands-down. And that's where the biggest difference is in power output comes from aside from having better flowing intakes (which only work with the aluminum heads). Newer generation 3500/3900 engines that come with VVT (variable valve timing) make even more power, but you can't retain that stock power level and curve without a functioning VVT system. And a 7730 ECM isn't going to help you here since it cannot properly control a VVT system.

HP Tuners does have tuning software that supports many VVT 3500 and 3900 applications, and it looks like it can disable VATS in these newer generation OBD2 ECMs too. Which means you could do a swap using a VVT engine without needing to buy aftermarket conversion sensors or going to the trouble of disabling the VVT system.

Just some food for thought...

-ryan


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7+ years on this same swap -- NO engine or transmission failures...

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

[This message has been edited by Darth Fiero (edited 10-13-2010).]

i had the LX9 from an 06 malibu in my car. some mechanical issues led me to yank the motor and give it back to my brother and go with a series III 3800 SC'd. its a good awesome sounding motor.

the malibu motor was chosen because of the lack of power steering pump.

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First LX9 Fiero GT, 1987 | My Fiero Fuel Economy | MPG Display for OBD I
Youtube Videos of My GT | modernize your fiero with technology!
If you can't fix it with a hammer, you've got an electrical problem
Fiero's are people too. We pay just as much attention to them, if not more than our loved ones
screw paying those bastards. im not going to become rich by paying for things.....

since i seem to be getting so many PM's about my hitch, ill answer right here
the trailor hitch/bike rack hitch jack, lifting and resting points...

quote Originally posted by Darth Fiero: Why would you want to do that? You'll basically end up with the equivalent of a 3.4 Camaro engine that only produces about 160hp, maybe a little more - if you put iron heads on one of these newer engines. But by the time you paid for gaskets, hardware, and put your time into swapping everything over, you would probably be better off and dollars ahead just finding a Camaro 3.4 to use in your swap. The newer generation 3100/3400/3500/3900 engines benefit from having larger port aluminum heads which outflow GM 60 deg V6 iron heads, hands-down. And that's where the biggest difference is in power output comes from aside from having better flowing intakes (which only work with the aluminum heads). Newer generation 3500/3900 engines that come with VVT (variable valve timing) make even more power, but you can't retain that stock power level and curve without a functioning VVT system. And a 7730 ECM isn't going to help you here since it cannot properly control a VVT system. HP Tuners does have tuning software that supports many VVT 3500 and 3900 applications, and it looks like it can disable VATS in these newer generation OBD2 ECMs too. Which means you could do a swap using a VVT engine without needing to buy aftermarket conversion sensors or going to the trouble of disabling the VVT system. Just some food for thought... -ryan

Well, it's a nice documented way to get compression up to 9.8:1 and still look stock. The roller cam also make for a quieter engine. Before I made a mess of going to the Trueleo intake and '7730 ECM at the same time, I put down 187rwhp and 249 ft*lbs with the Fiero ECM. That's Caddy 4.9 country from where I'm standing.
https://www.fiero.nl/forum/Forum2/HTML/075502.html

Really, before the intake and ECM change, it was a stump puller and I snapped 2 axles.

[This message has been edited by lou_dias (edited 10-15-2010).]

quote Originally posted by lou_dias: Well, it's a nice documented way to get compression up to 9.8:1 and still look stock. The roller cam also make for a quieter engine. Before I made a mess of going to the Trueleo intake and '7730 ECM at the same time, I put down 187rwhp and 249 ft*lbs with the Fiero ECM. That's Caddy 4.9 country from where I'm standing. https://www.fiero.nl/forum/Forum2/HTML/075502.html Really, before the intake and ECM change, it was a stump puller and I snapped 2 axles.

Those are impressive power numbers, but I would like to note (just for the sake of this thread) you didn't make that amount of power using stock (unported) iron heads. I also don't think having a roller cam makes the engine quieter. It does reduce friction and allows you to run a more aggressive lift ramp profile on your cam lobes vs. flat tappet cams tho... Still, 187hp and 249tq out of an iron-head equipped 60deg V6 is still pretty impressive. However, the new alum heads being used on the 3900 engines have intake port flow rates approaching that of LS series V8 engines. So there is a lot of potential there.

I'm not knocking the old all-iron 60deg V6; those of you who want to keep the stock appearance of the Fiero (using the stock intake and distributor) don't have much choice but to keep iron heads on whatever 60 deg pushrod V6 you decide on stuffing in there. But if your goal is power, using the complete modern 60deg V6 engine (alum heads and all) is probably going to be your most cost effective way of getting there. I've seen a number of iron-head 60 deg V6 build sheets total over $3000 in machining and parts costs and not even hit the 200hp mark. Just my opinion, but there are better ways to spend your money to get more power.