I have the tuning nightmare 96 Grand Prix SE 3100 auto trans.
Is there a simple fuel/spark piggyback controller I can use for my custom turbo project instead of going 12:1 FMU?
Technical is ok, I have a good strong ability to make things work.
Just need advice on the perfect fuel/spark controller. Nothing fancy or special, just a basic fuel/spark tune for turbo.
Thanks!
EDIT: Something that works well with a wideband O2 would be nice since I have the WB already.
Are there any piggyback fuel injector pulse time reducers? If I had a Walbro high pressure pump and larger injectors, I would be injecting more fuel then factory had tuned for. It seems a simple dial in reduction of injector pulse width would do the trick. Advise? Suggestions?
you SHOULD be able to swap in a 97 3100 PCM from a 97 GP/MC/CS/Regal/Lumina without much trouble and then it would be tuneable with HPT. your 96 is tuneable with DHP.
if you're interested in swapping in a newer PCM, let me know and i'll get you the wiring diagrams...
1995 Monte Carlo LS 3100, 4T60E, OBD1 Conversion...for now, future plans include a 3900, T04E-46 (Knock-Off) turbo (For the 3100, ~T61 for the 3900), and a F40.
you SHOULD be able to swap in a 97 3100 PCM from a 97 GP/MC/CS/Regal/Lumina without much trouble and then it would be tuneable with HPT. your 96 is tuneable with DHP.
if you're interested in swapping in a newer PCM, let me know and i'll get you the wiring diagrams...
Finding DHP is going to be hard, so I'm not counting on DHP. Out with the old, in with the new.
Yeah, I think swapping the PCM would be the best choice. Wire diagrams would be fantastic! Plus a little advise on few areas where I may get stumped. As long as it is straight forward, I can do it.
Much better to swap PCM's then buying AFPR, 12:1 FMU and all that jazz.
Now, if I am not going to need an FMU, will stock fuel pump hold up to 5psig boost?
HPT is a bit expensive but worth it in the long run. Might be cheaper to considering all the additional parts I wont need.
Yes please. Wiring diagrams would be real nice. I have a good head on my shoulders (../retain some modesty) so rewiring shouldn't be too hard.
1995 Monte Carlo LS 3100, 4T60E, OBD1 Conversion...for now, future plans include a 3900, T04E-46 (Knock-Off) turbo (For the 3100, ~T61 for the 3900), and a F40.
Finding DHP is going to be hard, so I'm not counting on DHP. Out with the old, in with the new.
Yeah, I think swapping the PCM would be the best choice. Wire diagrams would be fantastic! Plus a little advise on few areas where I may get stumped. As long as it is straight forward, I can do it.
Much better to swap PCM's then buying AFPR, 12:1 FMU and all that jazz.
Now, if I am not going to need an FMU, will stock fuel pump hold up to 5psig boost?
HPT is a bit expensive but worth it in the long run. Might be cheaper to considering all the additional parts I wont need.
Yes please. Wiring diagrams would be real nice. I have a good head on my shoulders (../retain some modesty) so rewiring shouldn't be too hard.
Your stock pump and injectors should be fine for 5 psi, for years turbo and SC kits have been relying on stock equipment for 7 psi. Keep in mind that if you have a vacuum signal at the stock fuel pressure regulator you will see increased fuel pressure under boost to help compensate for the added air. Not sure on your particular engine if that is a feature. If the turbo is blowing through a MAF sensor I believe that would also be more helpful than just a MAP sensor alone since the actual quantity of air flowing into the engine is being measured.
Now, this may seem like a silly question but, are the pin#'s ordered the same way for both 96-97? As in the 96 pin sequence is 1-40 starting bottom left working right.
Beyond that, this is great. With this info I can easily swap the PCM's. And with HP Tuner, man, I'll have great control. Shift points, injector pulse width and I will even have from scratch program ability. My brother is a freakin wize with all types of programing languages.
Do you happen to know what program language the PCM uses? Is it a typical stripped down version of Linux?
Your stock pump and injectors should be fine for 5 psi, for years turbo and SC kits have been relying on stock equipment for 7 psi. Keep in mind that if you have a vacuum signal at the stock fuel pressure regulator you will see increased fuel pressure under boost to help compensate for the added air. Not sure on your particular engine if that is a feature. If the turbo is blowing through a MAF sensor I believe that would also be more helpful than just a MAP sensor alone since the actual quantity of air flowing into the engine is being measured.
Yes, I have MAF. It is a 3100 (gen III) w/ 3400 top swap. Thats the only real mod so far. Turbo soon, hahaha, I'm so darn excited to get welding, wiring and then tearing down the highway!!!
Question, my stock injectors are old and the plastic band above the o-ring is warping from age/heat ect. Make it short, they are being replaced.
Is it ok to put in 36# injectors under stock pump? (tuning of course)
Cause I will be upgrading the boost down the road with stronger internals, the works. Having the 36#'ers ahead of that would be nice.
Are all the wire functions similar? I understand the pin# will vary, but are the functions identical in nature of their operation?
Seems like silly questions but I like to cover every angle ahead of time. Sometimes it bids me to ask away, but that is just who I am. I am a perfectionist at heart. I'm not happy until my spark plug wires are linear to each other and strapped down nice and neat.
Then again, there are no stupid questions, just stupid people, lol.
Thanks again Rob, you have been a great help. I'll be sure to post pics and some vids of the final product.
96 PCM - PIN 10 BLANK
97 PCM - PIN 10 Hot Coolant Lamp Control
My car doesn't have a change oil soon light or hot coolant lamp. I guess I could leave blank because non of the 3 extra wires on the 97 pcm will throw a DTC code.
Knowing that all 96 PCM pins are equally meet by the 97 PCM, all functions of the 1996 vehicle should work, right? It seems so, doesn't it? BUT, If the 97 PCM has a Tach Signal that 96 doesn't have, will I loss the Tach in the Cabin gauges?
All looks good now. The only question I have is whether I will loss the tach meter in the cabin factory dash gauges?
Originally Posted by robertisaar
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