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Old 07-25-2003, 11:00 AM   #1
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Default Bonnie vs GP PCM

My question is this: If I have two GM cars from the same year and both are SE'* and Pontiacs. Can I swap PCM'* out? Will that PCM in turn run the car its swapped into more agreesively or about the same. The reason I'm asking this is because the stock PCM from my GP GT/SE is sitting on the floor of my room. Just got this wild hair up my but and thought I'd ask about this. Was wondering if it would drive my Bonnie SE any faster.
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Old 07-25-2003, 03:19 PM   #2
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98 GP and 98 Bonnie use the identical L36. Personally (keep in mind this is ME talking, I'm an impulse kind of guy) I would try it.
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Old 07-25-2003, 03:19 PM   #3
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I am pretty sure it wouldn't even hook up, but if it did, I HIGHLY doubt it would help your performance any...now if it were a DHP PCM that would be different, but the stock PCM'* are close enough that you probably wouldn't notice a difference. I also know that if you put a GP PCM in a Regal it will run fine, but you won't have any guages but your speedometer, so maybe it will fit and you will lose guages or something.
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Old 07-25-2003, 05:16 PM   #4
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dbtk is right on. You may have options that the GP didn't, or the other way around. Also remember the hp and torque ratings are slightly different. The PCM'* are each tuned for their respective stock setups.

The GP has a more restrictive exhaust than the Bonneville. Your gear ratios are probably different too, so your shiftpoints will be all screwy.
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Old 07-25-2003, 07:25 PM   #5
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Hummmm........ Wonder what the final drive ratio of the GP GT/SE 3.8ltr. tranny is vs the Bonne SE 3.8ltr. Aren't they both 4T65E trannys? Agian both cars are 1998'*.
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Old 07-25-2003, 07:27 PM   #6
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Quote:
Originally Posted by willwren
dbtk is right on. You may have options that the GP didn't, or the other way around. Also remember the hp and torque ratings are slightly different. The PCM'* are each tuned for their respective stock setups.

The GP has a more restrictive exhaust than the Bonneville. Your gear ratios are probably different too, so your shiftpoints will be all screwy.
Actually the GP had more mods than the Bonne.
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Old 07-25-2003, 08:52 PM   #7
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The final drive ratios are different between the GP and Bonneville, even in the same model year.
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Old 07-25-2003, 10:33 PM   #8
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Quote:
Originally Posted by willwren
The final drive ratios are different between the GP and Bonneville, even in the same model year.
Do you or anyone else think it might be ok to send the stock PCM off the ASE and have it reprogramed with a Bonneville code in it? I'm sure that I'm not the only one who'* thought of doing this.

thoughts please..........

My sargent told me a long time ago that the only dumb question is the one you didn't ask.
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Old 07-26-2003, 09:02 PM   #9
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Quote:
The final drive ratios are different between the GP and Bonneville, even in the same model year.
All series II L67'* are 2.93 final drive.
All series II L36'* are 3.29 final drive.
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Old 07-31-2003, 02:31 AM   #10
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Quote:
Originally Posted by dbtk2
All series II L67'* are 2.93 final drive.
All series II L36'* are 3.29 final drive.
I don't know for sure about GP'*..
but for bonnies with series II

SSEI has final drive ratio is 2.93 :1
SE is 2.86 and available with 3.05:1
SLE standard drive ratio is 3.05:1
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