Love my GXP,but it needs more HP - 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 07-09-2004, 12:09 AM   #1
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Default Love my GXP,but it needs more HP

I took my new GXP (780 miles) to Kil-Kare Dragway in Xenia tonight,and I was disappointed in the on track performance.Only made two passes. The first was a [email protected] and the second was a bit better [email protected]r making my runs I met a nice young man from Columbus.He told me about this website.He also told me to unhook the sensors on the front hubs,and that would fool the traction control system,and improve HP.Does anyone else know some easy mods to make on this 4.6 Northstar.Testing later proved that wheel spin did reduce HP.The GXP seems to run extremely better when the front tires do not spin at all.Any help is appreciated. Thanks,Doug

P.*. Very nice to find a web site for the Bonneville!
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Old 07-09-2004, 12:27 AM   #2
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Have no fear...INTENSE racing just bought a GXP...in due time you will fly

For now, I would start with the exhaust
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Old 07-09-2004, 12:43 AM   #3
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Welcome to the club!!!! Glad to hear Todd sent you here. Those times aren't too bad, as for mods, you need to wait a little bit, but first make some kinda cold air intake and open up the exhaust. Parts will be coming soon.
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Old 07-09-2004, 12:57 AM   #4
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Glad you found the site Doug, was good to talk to you this evening. There are rumors of a supercharger being made available for the northstar in the 05 models. I'm sure INTENSE will look at retrofitting that to the GXP as the owner has one now. The exhaust on the GXP is pretty free flowing so I would concentrate on opening the intake (not sure what the stock TB size is but betting 72 might look at porting that to 80 and doing a cold air intake or FWI or ram air. Not a ton of stuff for the N* yet but that will change in the near future im sure.

Welcome and you may want to introduce yourself in the introduction forums.

Todd
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Old 07-09-2004, 01:01 AM   #5
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I try How true is that rumor for the Northstar supercharger? What color is your GXP 04GXP?
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Old 07-09-2004, 01:05 AM   #6
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Quote:
Originally Posted by ssesc93
I try How true is that rumor for the Northstar supercharger? What color is your GXP 04GXP?
How true is any rumor? It was goldish, bronze mist maybe?
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Old 07-09-2004, 01:06 AM   #7
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I'm 99% sure the TB is already 80mm and it'* drive by wire too. I forgot about the exhaust is free flowing, I believe their Corsa mufflers and tips actually, the sound is little quiter though than their aftermarket kits. Mine was louder but cost a small fortune to add, your'* has same free flow design and came with the car. You could put a hi flow cat on, but get some kind of cone filter going.
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Old 07-09-2004, 01:09 AM   #8
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I'm waiting for INTENSE to come out with a 4cam set for the N*. 2 over each head. Wont that be a fun project...
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Old 07-09-2004, 02:17 AM   #9
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Watched an episode of 'Trucks' on the weekend on spike tv and Stacy was at the Sema show, anyways there was a tricked out truck with 4.6 northstar with a 112 super charger bolted on
The camera did nothing more than glance at the engine but Stacy went on about the styling of the front entry truck (very cool) and custom paint.
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Old 07-09-2004, 02:47 AM   #10
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Build up an intake system for colder air, sorta like I did. You don't need to spend 300 bux on some pre fab system...

http://www.bonnevilleclub.com/forum/...ic.php?t=15624

Get a colder stat.

Northstars use 75 MM TB'* stock, unless this motor is new and different then all the rest...
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