Pontiac Grand Prix Forums : Grandprix

This is a reference on how to determine the correct pulley size for the Pontiac Grand Prix supercharger. The write-up can be found here.

good deal, we need stuff like this over here.

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245 HP/326 TQ
K&N CAI | 1.9 RR's | 105#'s | TOG Headers | Borla Catback | AL 104's | 8.5mm wires | 180* Thermo | 3.4 | AEM Wideband | Poly Mounts | Wideband Tuned | SSC Springs

Depending on the set up and tune, you can run a 3.25" pulley without any head work. I'm running stock heads on my GTP and with my current tune, I have 0* KR all the way through the top of second gear from all the scans I've done. Now, the same is not always true for everybody. The point is....TUNE!

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MACGP President
3.25"/P&P Gen III/ZZP Stg II TB/Thasher CAI/ZZP VS Cam/TOG Xtremes/AL 104s/180*/Full 3" Exhaust/SD Package/GMPP Sways & Arms/DuBob'd

nice write up should be useful info for many

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Black 98 Regal GS: best run 13.95@99.75
99 Red GP L36: 15.5 in 1/4

hey when he said PCM- standard v 1.0 on the 3.4 pulley paragraph did he mean dhp or zzp or did he mean either one because he wasent trying to start a 4 page disscussion? i'm new and diddnt know if they were both v 1.0 or if just one of them was.just making sure before i buy the crap.

quick question on the PEM does it HAVE to be both or can you get away with just the front.

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Justin Young, Kansas
1999 silver GTP DHP pcm,3" Cattless hogan DP,Front PLOG,3.4 pulley, ported TB, ported LIM, ported supercharger housing.porting done by GBP
coming soon: LS6 springs ,1.9rr

Obviously both would probably be best, but with as restrictive as the front manifolds are, they would be a good place to start.

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Scotty Hall
2001 Pontiac Grand Prix GTP
It whines a lot, but I like it.

The only place success comes before work is in the dictionary.

Great spirits have always found violent opposition from mediocre minds.

i know the front is the worse...but i will let someone else chime in also...

I to would have to agree......The front is the big problem...back is minor....I have been thinking about going with a power log instead of headers (since its a daily driver and I am not looking to run 12's) but that is still up for debate.

webracin

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2001 Grand Prix GTP
ZZP HUB 3.2 3.4, ZZP 8 Rib conversion, JC 3" DP Gen 2 cat & U-bend Delete, Accel Super Stock 8mm wires, DHP 1.5, 180* Thermo, Throttle Spacer, SS Intercooler, ZZP Fuel Rails, SLP CAI w/K&N Cone, Dynomax cat back, ZZP Tranny.

2000 Grand Prix GTP Daytona K&N, Flowmasters

yeah i would too go with the powerlog or just port the hell out of the stock header...i have seen it done before and it turned out pretty good.i have also heard of possible heat problems with the fan and aftermarket headers due to the heat sheild not being able to bo back on...but who knows maybe not....i also wouldnt want to cover up those 300 dollar ceramic coted headers with a heat sheild...

I find it a little odd how the cat back system is saved for last. is there any reason for that? most people i know, the very fisrt thing they do to there car is a Cat back and a CAI

The reason is because the main restriction in the catback system is the cat, and the u-bend. Not the catback it's self.

And the next restriction is the stock mufflers. Most everyone including me hates the sound of aftermarket mufflers on these cars. Therfore they just leave the stock mufflers on.


And if your going to leave the stock mufflers on then there is no point in changing the catback out.


Another reason is we have plenty of people including my self that have been in the low 12's and 11's trapping 107 - 115's in the 1/4 on the stock catback.

the stock catback flows extremely well

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2003 SSEi, Intake, Exhaust, Suspension, Brakes
09 installs Gen V, 1.9's, S3IC, Meziere EWP

Nice, it's good to see people looking out for others... So did you learn the hard way and blow you motor or did you get to know some good people early on in your mod phase?

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4.2 Stroke

The ONLY way you can determine if you can drop pullies is a scanner, period. Without that, your shooting in the dark and risking you're motor.

As for higher mileage GPs. As long as you check the vital components... compression, oil pressure, oil useage, etc. I'm running a very healthy 170,000 mile motor myself without any issues. Theres many with way more miles than me running way more extensive setups too...

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Shawn W. Larsen


'07 Chevy Trailblazer SS___'00 Pontiac Grand Prix GTP ___'99 Pontiac Grand Prix GTP

im kinda new to all this and am looking to mod my 97 gtp. what does "kr" stand for?

http://www.grandprixforums.net/f81/s...car-17482.html (Safely Modding Your 3800 Powered Car!!)

Read.

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2003 Blue-Black Metallic GTP Sedan - Almost Done...
2007 Gold Mist Chevrolet Cobalt LT - Custom CAI, NGK V-Power's, Muffler Delete, Custom Tuned PCM...Sure does have every bit of 130 FWHP
http://www.cardomain.com/id/03blueGTP