**Need Throttle body help** - 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 01-31-2006, 01:48 PM   #1
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Default **Need Throttle body help**

<edit to post , Fri. Feb. 5 I Started this post to find some basic knowledge of what engine was and what it came in and after 5 days and learned a few tidbits.GM is tightlipped bout engine, it doesnt have any gm racing applications so that makes it harder to figure out what mods will work and where the heck to get em. i thank the people who helped and ask that posts on LD8 go in Intense'* post (why 275 hp?) as I feel I'm stepping on his idea for post and hindering the collection of a database for engine. and thanx gm4life, toasted oats, and elmachogeracho for your input..I'm going to start watching Intenses thread and editing similarty of mypost subject out~thanx DIZ ...OMG sounding like a moderator, quess years are catchin up with the life long hippie.
Re-edit Feb.3 changed post title cause I need help NOT trying to give help

I recently bought a Nitrous oxide kit for my Northstar and i will posts pics when It'* in and that will trick it out nicely for those little displays of power,... but I spent alot of cash so far and would like to take to the track in the future after the warranty and for a double fogger ( a later ugrade to nitrous) I need alot more cfm. Anyone know for sure which other GM models with exact engine model as ours. If someone came forward and could tell me a bigger rated throttle body that would just bolt on,I would fall over dead and get back back up and run to GM and buy it. Fingers and toes crossed for news that Intense puts out a PCM-the checks ready to mail. Thanx~ Diz
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Old 01-31-2006, 01:56 PM   #2
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its the northstar that was used in the old seville sls. i dont think its used any more. they went to the 320hp one in the new caddys
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Old 01-31-2006, 04:07 PM   #3
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Default Re: which variant Is the 275hp northstar

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Originally Posted by gxp rules
I was talking to a guy at TPIS Performance about adapting their 90mm 1200 cfm throttle body to gxp and well he said he'd get back to me, ya ok, but he thought it was same as CTS-V.. does our northstar even come in a caddy? or was it made expressly for pontiac-buick applications. Poured myself thru web sites all day yesterday and didn't get any closer to finding anything. It'* like asking for ferrari parts or something.
I think the new Northstars use Variable valve timing and ours dont. I drove a new caddy and found it to feel much more resposive then my GXP. Its still a grreat car motor.

The product information page at the dealer states the Bonnevelle GXP is the most technologically advanced perfomance package ever offered in a pontiac. Even more advanced then the new Grand Prix GXP I guess due to the 32 valve engine.
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Old 01-31-2006, 10:59 PM   #4
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Wait a min....the 4.6 has an option for a 90mm TB?!

The Aurora 4.0 has a 72mm, with the option for boring to 80mm, as well as the mounting plate to match. I had NO idea the 4.6 had a 90mm TB

I need this verified. If so, can it be adapted to another variant of the Northstar..ie a 4.6L TB mounted to the 4.0 intake.
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Old 02-01-2006, 02:05 AM   #5
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whoooooooooooooooooo! nelly! not even sure of Northstar throttle body size yet , just seeing if their throttle body can be adapted but looks like have to pay for custom mounting plate and would put current pcm in a tizzy, anyway. I'm the kind of guy who put a carter afb on a 65 mustang with an adapter plate after dremeling out the two barrel manifold enuff to accomadate the cfm....had to do things that way , way back when and its sad to see kids these days rely on bolt on aftermarket mods. think the northstar orphan might have to use some of that old backyard philosophy. Anyway it'* nitrous for now and I'm gonna keep brainstorming.

Do I smell burnin gears or somethin?
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Old 02-01-2006, 11:54 AM   #6
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your doing nitrous on your GXP
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Old 02-01-2006, 01:23 PM   #7
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YES! nitrous is on the way.....wonder if it'* a first for a Bonnie in club?
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Old 02-01-2006, 01:26 PM   #8
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Quote:
Originally Posted by gxp rules
Bought and paid for even includes little cap plug if i have to pull off system off to take to dealer this car'* covered bumper to bumper for 72000 miles on extended premium GM warranty i figure might as well get my moneys worth

4 im done gonna make you ssei guys think ya drivin vegas remember them lol
jest ribbin ya
wow, thats awesome, you have some balls. we need to be kept up to date on the progress on this
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Old 02-01-2006, 01:40 PM   #9
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cahonies yes and a little cash for toys <smirk>
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Old 02-01-2006, 07:38 PM   #10
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Nitrous... Beware... Now actually umm you have the LD8 verison.
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