Why Only 275 Horsepower? - 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 05-27-2004, 12:42 AM   #11
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Quote:
Originally Posted by BadSSEi
I just brought home a new GPX and I have two comments:

1) Damn, is this thing SLOW!

2) Other than the above problem, this is one of the nicest cars I've ever ridden in, driven or seen.

Maybe I'll have to focus a little on the first issue...

Scott
Congrat'* Scott. Can we expect to see you at Bonnevillefest?
BTW, what color and any clues on what the mods list will be looking like?
Probably hard to guess the mods yet, until you get to know the N* like the L67.
Anyhow, be sure to keep us updated on what our speed-demon GXP is progressing.
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Old 05-27-2004, 12:48 AM   #12
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Scott....feel free to work on the Northstar, dont forget the 4.0L in your plans
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Old 05-27-2004, 09:27 AM   #13
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Quote:
Originally Posted by BadSSEi
I just brought home a new GPX and I have two comments:

1) Damn, is this thing SLOW!

2) Other than the above problem, this is one of the nicest cars I've ever ridden in, driven or seen.

Maybe I'll have to focus a little on the first issue...

Scott
It'* going to look funny having that 04 Bonneville GXP 15 @ 95 in your sig
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Old 05-27-2004, 05:12 PM   #14
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Quote:
Originally Posted by BadSSEi
I just brought home a new GPX and I have two comments:

1) Damn, is this thing SLOW!

2) Other than the above problem, this is one of the nicest cars I've ever ridden in, driven or seen.

Maybe I'll have to focus a little on the first issue...

Scott
I agree with you on #2 - the Bonneville GXP is a very sharp looking car...the nicest in Pontiac'* lineup IMO.

Maybe you should forget #1 Scott and figure out where the cruise control is

Cheers,
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Old 05-27-2004, 06:01 PM   #15
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Quote:
Originally Posted by Rogue
It'* going to look funny having that 04 Bonneville GXP 15 @ 95 in your sig
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Old 05-27-2004, 08:20 PM   #16
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i guess going from your SSei to almost anything would be slow. I bet to you my car would feel like its barely moving all the time
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Old 05-27-2004, 11:54 PM   #17
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BadGXP... Hrm, you sure you wanna race out a nice car like that? j/k....

You better be at the national meet in july, and you better have that sucker running 12'*

Other then that, congrats, you've earned it working hard for the 3800 community, and now you have a whole new bag of worms...
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Old 05-27-2004, 11:59 PM   #18
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Getting back to the differences in the two motors.

After a bit of digging the cylinder heads are diff. the caddy gets 2 (1.425in) intake valves same as the gxp but the caddy gets 2 (1.42 in) exhaust valves while the gxp only gets 2 (1.102 in) exhaust valves.
Also cadilac has a cam shaft posistion actuator system that allows the ecm to adjust cam shaft timming of all 4 cams while the engine is running, not the gxp.

I would think these two facts might add up to the 25hp drop in the gxp?
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Old 05-28-2004, 03:56 AM   #19
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pics of this GXP?? i'll believe it when i see it!
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Old 05-29-2004, 01:04 PM   #20
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Quote:
Originally Posted by PontiacDad
Getting back to the differences in the two motors.

After a bit of digging the cylinder heads are diff. the caddy gets 2 (1.425in) intake valves same as the gxp but the caddy gets 2 (1.42 in) exhaust valves while the gxp only gets 2 (1.102 in) exhaust valves.
Also cadilac has a cam shaft posistion actuator system that allows the ecm to adjust cam shaft timming of all 4 cams while the engine is running, not the gxp.

I would think these two facts might add up to the 25hp drop in the gxp?
the 300hp version uses bigger cams also. its the SLS (also gxp now) vs the STS motor
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