Why Only 275 Horsepower? - Page 3 - 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 06-14-2004, 06:15 PM   #21
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Monday, Tuesday, Thursday, Wednesday!!!!!

What'* it matter what you start with? Same block, done. Everything else is modifiable. What you end up with, now that'* the question.

Start: 275hp or 300hp. <-- same block, and most internals
Finish: Whatever your pocketbook lets ya, lumpy cam, stroked, injectors, wow...

Now I'm all confused...

Hot 'n' bothered, too...
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Old 06-14-2004, 09:24 PM   #22
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Quote:
Monday, Tuesday, Thursday, Wednesday!!!!!
The Godfather

Todd mentioned something about Intense doing a supercharged Northstar
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Old 06-15-2004, 10:05 AM   #23
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Quote:
Originally Posted by Jim W
Quote:
Monday, Tuesday, Thursday, Wednesday!!!!!
The Godfather

Todd mentioned something about Intense doing a supercharged Northstar
Can't wait to see the numbers on that one!!


Yep, "The Godfather". My wife and I loved that series. (I, II, III)
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Old 08-08-2004, 05:24 AM   #24
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SC northsar done already by XMS

SC with roots already done by another source..seceret.

Turbo already done by Cadillac Hotrod Fabricators. Among a few oothers.

Mild cam work with a stocker is the best way to gain "some" hp while waiting for greter options.

Ty
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Old 08-09-2004, 03:27 PM   #25
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Quote:
Originally Posted by speedyguy
SC with roots already done by another source..seceret.
Secret?!?! Pfft...lotta good that does us...



:P
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Old 08-11-2004, 10:14 PM   #26
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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?
I thought only the new RWD northstar applications got the variable cam phasing version of the engine?

Scott may want to consider developing products that work with both fwd and rwd/awd applications - given caddy'* new performance image and success. The RWD northstar is in the new XLR roadster, SRX cross-over, and forthcoming 05 STS. I believe caddy is going to offer a supercharged version is the "v-series" of all these cars.
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Old 12-31-2004, 08:28 AM   #27
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When is GM going to wise-up and start putting the 320 HP Caddy North* motor and tranny in the Bonneville GXP??,.....seems to me that GM Pontiac better start keeping pace with the rest of the recent Caddy HP upgrades if they want to keep GXP buyers still interested,....besides,what GXP owner wants to be totally blown-off by some fat-cat driving a hemi 300C??
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Old 04-04-2005, 12:57 PM   #28
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Lets see... what happens when you drop a 320 horse motor in a front-wheel drive car? The 300C driver would be consoled by the sight of the Bonneville that beat him torque-steering into the weeds. Unless Pontiac made a trick drive system like Honda'* SH-AWD. Unlikely on a platform about to be discontinued Those bean-counting bastards! "Unless you're willing to spend money,you're pretty likely not to make any "

next-gen car
AWD or rear-drive
Ls2 390 hp.
6speed auto or manumatic
slick styling
under $45,000
Seeing the end of the 300C -priceless
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Old 12-31-2005, 08:19 PM   #29
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Greetings:

I am a total n00b to these forums (first post). I just bought a 2005 Bonneville GXP. It is a tri-color white/gold with the 4.6L Northstar. Great car!

I joined these forums to look for performance modifications and to see what the other Bonneville owners had to say about the GXPs. Looks like we all have the same questions.

Anyway, I look forward to getting to know you all better.

BTW: any '05 GXP owners had trouble with the Goodyear tires? I have had three replaced already and the new ones have been in three times for balancing and still shake. Very irritating!

Cactus Kid
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Old 02-08-2006, 07:17 PM   #30
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Quote:
Originally Posted by GXP4me
Lets see... what happens when you drop a 320 horse motor in a front-wheel drive car? The 300C driver would be consoled by the sight of the Bonneville that beat him torque-steering into the weeds. Unless Pontiac made a trick drive system like Honda'* SH-AWD. Unlikely on a platform about to be discontinued Those bean-counting bastards! "Unless you're willing to spend money,you're pretty likely not to make any "

next-gen car
AWD or rear-drive
Ls2 390 hp.
6speed auto or manumatic
slick styling
under $45,000
Seeing the end of the 300C -priceless

Torque-steer is not problem with my GXP. In the newer grand prix with the 5.3 its a different story.
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