GXP Horsepower Update - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Bonneville GXP/ Northstar Powered Cars Discuss your Bonneville GXP and/or any other Northstar powered Olds or Cadillac... Including the 3.5L Twin Cam V6 (Short Star ) 4.0L and 4.6L Northstar V8's. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-29-2004, 04:03 PM   #11
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Quote:
Originally Posted by GXP Gauger
I work for Scott but not for Intense and I have the other GXP. I believe that something is in the works but it is a lower priority right now. I know all the 3800 guys will welcome the latest Intense offering, a complete intercooler kit. I would not expect anything in '04 but Scott has surprised me before. Scott did dyno the GXP earlier this year and the results were a little dissapointing :( . But as Scott said there is plenty of room for improvement

Do you have a pic of the K&N setup you can post? What is the part number?
Just found the part number, it is K&N #33-2063-1 for the GXP air filter. Fits perfect, although I am not for sure how much horsepower it has "unleashed". Since you work for Scott, I have been corresponding with TY from DP and he has suggested I go with a turbo once the computer is cracked. I just have to wait until someone fabricates one. I am ready to buy now, any advise on your end??
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Old 10-29-2004, 05:45 PM   #12
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33-2063-1 is the K&N replacement for 1992-1995 L27 and L67 Bonneville'*, Park Avenue'*, Lesabre'*, 98'*, and 88'*.
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Old 10-29-2004, 07:26 PM   #13
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I spoke to Scott today about it. He is sure that he can make some improvements as soon a he has access to the PCM. The big question is when he will be able to gain access. I know it is being worked on but there is no time table. I think GM made a huge mistake not putting more horsepower in this car, especailly with the 300c coming out. I am sure Scott will post as soon as he has something available, and since he signs my paycheck, I am not going to speculate as to when that will be .
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Old 11-04-2004, 08:43 PM   #14
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Are you sure about those HP numbers? 250 sounds about right at the wheels, but not the crank. Did he already pull the engine out to get that measurement, or is there a way to measure at the crank without pulling it?
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Old 11-04-2004, 11:00 PM   #15
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Quote:
Originally Posted by dpjones
Are you sure about those HP numbers? 250 sounds about right at the wheels, but not the crank. Did he already pull the engine out to get that measurement, or is there a way to measure at the crank without pulling it?
Yes, we were all pretty disappointed with the dyno numbers. I forget what the wheel numbers were exactly but I want to say it was around 205-210 at the wheel. So we assume 20 percent drivetrain loss (whether this is true or not I don't know) that gives about 256 or so at the crank. In fact we had another club member with another GXP who actually thought about going to get his car to dyno just to compare.
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Old 11-05-2004, 12:09 AM   #16
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Like I just side else were FWI the northstar tarnnies loss is 24%
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Old 11-05-2004, 12:45 AM   #17
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20% seems high and 24% seems outrageous. I've always heard 10-15% was more like it. It would be nice to know exactly what the motor was putting out. I think it was 5 - 6 years ago when Mustang Cobra owners were getting their cars dynoed and finding they were down around 40HP. Enough people complained and Ford looked into the problem and discovered there was a problem with the intake manifold causing the loss in HP. Ford paid to have the intakes replaced on those cars. I would like to get mine put on a dyno, but I don't want to until I have some mods available to do a before and after.
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Old 11-05-2004, 01:00 AM   #18
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Wish it was lower but it IS 24% I was a northstar owner before the SSEi spoke with seveal members who dyno'ed their STS, ETC and Auroras before just to gather info for when I dynoed my aurora, btw my stock #'* were so close to other stock 4.0'* than after intake and bored TB was like 216 @ wheels estamated 270ish crank.
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Old 11-05-2004, 01:56 AM   #19
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Thats what I am putting down right now with a gutted/K&N intake and cat back exhaust...about 270 brake HP with 24% 4T80E power loss to the tires, putting me down to 215 FWHP. *itches for bored out TB* to bad RSM went and jacked the prices up on me

Mid to low 20% points in tranny losses for a full sized sedan isnt bad really considering Chrysler and Ford sedans have much worse power loses.

Its not fair to compare the tranny and engine in a 5.0L Mustang V8 to a Bonneville, its to apples-to-oranges type comparision. Frankly I would rather have a long living high geared electronically controlled tranny with 24% power loss from GM then deal with some of the other garbage trannies in domestic cars.
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Old 11-05-2004, 02:23 AM   #20
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Quote:
Originally Posted by OLBlueEyesBonne
33-2063-1 is the K&N replacement for 1992-1995 L27 and L67 Bonneville'*, Park Avenue'*, Lesabre'*, 98'*, and 88'*.
Oops!! I just realized I was wrong here. The above filter is the replacement filter for 1997-1999 Grand Prix 3800'* for starters. There were many other GM applications on the list of vehicles using this filter. No Bonneville'* or Series I L67 and L27'* though.
My bad.
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