Attempting LY7 Fiero

[sYkboy]

Hey fellow 60ºers. I am new to the site and figured you guys might lend more info than I have been able to find anywhere else. I could really use assistance in finding info on wiring harness and such to put an LY7 in a Fiero. Haven't purchased engine yet, may wait for LY7/6spd auto combo from the '07s. Though using the 4T65E combo from a LaCrosse or Rendezvous would probably be easier. I want to get my ducks in a row or better yet a flying 60º Vee!

Thanks,
Jay

[onefastV6]

Hey fellow 60ºers. I am new to the site and figured you guys might lend more info than I have been able to find anywhere else. I could really use assistance in finding info on wiring harness and such to put an LY7 in a Fiero. Haven't purchased engine yet, may wait for LY7/6spd auto combo from the '07s. Though using the 4T65E combo from a LaCrosse or Rendezvous would probably be easier. I want to get my ducks in a row or better yet a flying 60º Vee!

Thanks,
Jay

Nice choice on the engine, I would love to see a completed 3.6L swap.
The wiring harness is going to be pain, but I suggest starting with the 3.6L wiring harness and going from there. Also I am not sure how GM is handling their tranny programming now days as I was told by a friend that his 07 Trail Blazer SS had a separate PCM that controlled the tranny. If this is the case for the 3.6, it might make the swap easier.

HPtuners supports the 3.6L, so that should help iron out most of the codes and security issues.

[sYkboy]

Yep

That is basically what I was thinking. HPtuners lists them but I will have to get mucho supporto for that. I haven't jacked with tuning anything yet and the 3.6 may be a beatch to start with. I don't know. I think the project could be wonderful and worthwhile but will probably put me in the loony bin. I am not going to let that stop me though. What may stop me is the fact that I just found 2 Short Stars with rel. low mileage at the bone yard in complete cars. Mmmust Re...re..sist the temptation.........

[sYkboy]

Yep

I KNOW the 3.6 would be the bomb. Especially if I could find a tanked Acadia/Outlook/Enclave.

[sYkboy]

OK, apparently there is not much interest or no one has a lot of info, yet.

Thanks anyway, I will share when I find out something.

jay

[bszopi]

Yeah, these engines are new enough that people either don't mess with them in the cars that they came in, or they are pretty high priced, and as you are discovering, its hard to get info about them. I've love to pick one up to mess with, but I have too many other things going on to warrant it (and 4 other engines already sitting in the basement waiting for love).

[sYkboy]

Yeah, not much out there, I think the best route for me will be a LaCrosse or Randezvous with a 4t65e for starters, then the 6spd auto later on.

[sYkboy]

Going to look into what the off-road guys are doing. Another member has a 3.6 in a rail. I am getting warmer, I can almost smell the rubber burning.

[Bluegoose]

Who has the 3.6 in a rail? I really need to talk to him. I just recently aquired a 2004 CTS crate motor from the Factory to go in my rail. It sure is nice to have relatives at the factory.

Ronnie

[corrmaster]

I have an 87 gt fiero, and a 3.6 alloytec HFV6 Global engine sitting in the garage. The cradle is out, where do I go from here? According to the crew here the engine needs the origional harness, ecm is part of the engine, PCM and PIM and origional remote key, to run. Or a Wolfe controller.. but .. will this engine even fit in a fiero?

[Blackrider]

Nice choice on the engine, I would love to see a completed 3.6L swap.
The wiring harness is going to be pain, but I suggest starting with the 3.6L wiring harness and going from there. Also I am not sure how GM is handling their tranny programming now days as I was told by a friend that his 07 Trail Blazer SS had a separate PCM that controlled the tranny. If this is the case for the 3.6, it might make the swap easier.

HPtuners supports the 3.6L, so that should help iron out most of the codes and security issues.

The 6T70 uses an internal TCU, however is till receives input from various sources such as the braking system for its automatic downhill assist system. Due to the ECU being internal I can guess that the only way to program it for performance is via a tuner of some sorts, no mail order TCU.

Good luck on the swap the LY7/ 6T70 combo should be petty amazing.

[Joseph Upson]

I have an 87 gt fiero, and a 3.6 alloytec HFV6 Global engine sitting in the garage. The cradle is out, where do I go from here? According to the crew here the engine needs the origional harness, ecm is part of the engine, PCM and PIM and origional remote key, to run. Or a Wolfe controller.. but .. will this engine even fit in a fiero?

The Northstar and 3.4 DOHC fit, I can't see how the 3.6 wouldn't. the most simplified approach is to install a 7x reluctor wheel and manage it with a preexisting OBD II PCM. The camshaft actuators with a little creativity can be locked into a specific position to function like a non VVT engine. The 3.4 DOHC programming is probably the closest thing to its programming data from a basic standpoint as a starting point. I used aluminum tubing to lock the cam actuator in the 3900 at 0 deg at TDC for my engine which is what the cam regrind specs called for.

The OE PCM would be the best controller without question, but there is a lot of extra vehicle related nonsense in it for what you are trying to swap it into and very little support for it and what little that is available in my opinion is impractically high priced relative to other options due to its newness. EFI-Live for example should have programming equipment for it at over $700 but I don't know what it's capable of.

[corrmaster]

Thank you for your input.. Being in Australia, the 6t70 isn't even available here, which is frustrating.. but the vvt engine is.. and disabling the vvt sort of defeats the purpose of doing the swap as wanting it all is why one would do it in the first place.. I did get this from one who knows more than me..
rob@memcals.com wrote:
> it should all run with the original modules& you will need a remote keypad from the car as well.
> the VZ(GM Holden Commadore) uses a standalone trans module so if the engine controller is setup as a manual, it will work in theory, ill get the wiring diagrams organised asap ok.
Meanwhile, the whole project is looking daunting.. I wonder what would happen if I just bolted it up to the existing 3 sp auto.. ..

[Fiero Brick]

I would hunt you down and kill you.

And take the engine.

[Nightingale]

I am still trying to work out the details with my 3.9L swap. I am in the same boat with the wiring. I am probably going to order a pontiac g6 shop manual so I have some schematics to work with, and I am talking with efilive in hopes that they might be able to help me eliminate the need for the bcm or at the very least stop the pcm from going into limp mode just because the abs, air bags, etc aren't hooked up. This website here has a complete 3.6L swap for off-road applications, but I bet they'd sell you just the harness and computer if you contact them direct http://www.mechtech-ms.com/ctsv6.php .