GTP' supercharger Louder than SSEI's?? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 09-05-2003, 06:47 PM   #11
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So you mean to tell me that a GTP is tuned the exact same way as an SSEI? I find that a little hard to believe. Exact same spool up engagement time, as well as same stock pcm programming? I don't think that it is correct.
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Old 09-06-2003, 07:32 PM   #12
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All engine parameters are the same,Only on the 97-99 cars. 00 up has much more computer involvement I have talked with Charles from DHP, about doing my custom PCM, and he can do it, but we will have to do it on a dyno.
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Old 09-06-2003, 11:03 PM   #13
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Quote:
So you mean to tell me that a GTP is tuned the exact same way as an SSEI? I find that a little hard to believe. Exact same spool up engagement time, as well as same stock pcm programming? I don't think that it is correct.
Since both cars have the same engine and tranny the computers in each car (ssei and gtp) control the engines the same way. The fuel tables are the same, the boost is the same, the shift points and speed limiters are the same. The only thing different between the computers is the traction control, and the difference in wiring for the different body, which is why you can't use the same computer. But GM has no reason to come up with different control systems for the same drivetrain, that would only cost them more money.
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Old 09-07-2003, 12:40 AM   #14
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not too get off subject, but since both are set up identically does this mean that the SSEI is slower?? im assuming it wieghes more.
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Old 09-07-2003, 10:53 AM   #15
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Yes, my SSEI stock was consistently about a second off of a good stock GTP time

Intense explains it well here.

How fast is my L67-powered car in stock form?

We get asked this question all the time, so we’re going to give this our best shot…

If you have a ’97 to ’02 GTP or GS, your car will run about 14.8 in the quarter mile in stock form. There are lots of variables here, but this is a realistic average based on our experiences. If you have an SSEi, your car will be about one second slower. The Bonneville’* are only a few hundred pounds heavier, but they are slower for several other reasons too:

additional weight (several hundred pounds)
poor weight distribution for drag racing (things like the battery in the back seat, aluminum hood, aluminum control arms and aluminum front bumper all work to reduce the percentage of weight on the front tires, resulting in less traction during acceleration)
larger front brakes (more rotating mass reduces power put to the ground)
larger tires and wheels (increased rotating mass takes more power to accelerate)
restrictive PCM (much more aggressive traction control system cannot be overridden by simply pulling a fuse; PCM will actually retard ignition timing if you try to power-brake the car)
no Performance Shift function (so shift points are lower and shifts are slower)
no air opening behind the headlight means that removing the headlight won’t give you any cold air
The Regal GS is slightly (a couple tenths) slower than a similarly equipped GTP, for some of the same reasons as the SSEi.



Although alot of the speed curses are only related to 2000 and newer cars, That is why I wanted a low mile 98 or 99 when I was looking for my car.
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Old 09-12-2003, 08:11 PM   #16
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So if the GTP and the SSEi have the same sound then the Buick Park Avenue Ultra, the Regal GS, Rivera, LSS and the other series II */c car that i don't remember has the same sound.
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Old 09-12-2003, 08:27 PM   #17
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Quote:
additional weight (several hundred pounds)
poor weight distribution for drag racing (things like the battery in the back seat, aluminum hood, aluminum control arms and aluminum front bumper all work to reduce the percentage of weight on the front tires, resulting in less traction during acceleration)
larger front brakes (more rotating mass reduces power put to the ground)
larger tires and wheels (increased rotating mass takes more power to accelerate)
restrictive PCM (much more aggressive traction control system cannot be overridden by simply pulling a fuse; PCM will actually retard ignition timing if you try to power-brake the car)
no Performance Shift function (so shift points are lower and shifts are slower)
no air opening behind the headlight means that removing the headlight won’t give you any cold air
The Regal GS is slightly (a couple tenths) slower than a similarly equipped GTP, for some of the same reasons as the SSEi.
This is interesting. It'* obviously written about a 00 or newer, considering the location of the battery quoted.

In comparison my 93 SSEi:
My battery is in under the hood. My hood is steel, fenders plastic, but all the suspension is steel as well.

I only have 10" rotors, so my rotating mass is lower than a stock GTP.

My wheels are only 16". Not a problem with mass there, either.

Non-restrictive PCM (ok, I cheat. I have Jet Stage 2), and my traction can be disabled, but it never retarded timing, anyway. Uses applied braking when it'* on.

Not only do I have performance shift, but the Jet raised my shiftpoints.

I have large openings behind my headlight. 2 large 3" diameter holes, to be specific.
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