Thread: Determining Safe Pulley Size with L67 & M90 [*]

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  1. #1 Determining Safe Pulley Size with L67 & M90 [*] 
    SE Level Member gmboy's Avatar
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    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.
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  2. #2  
    GTX Level Member kyle99gtp's Avatar
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    good deal, we need stuff like this over here.

    2005 WRX STi , 2002 WRX, 2007 Impreza 2.5i, 1997 Impreza L coupe - All stock
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  3. #3  
    GT Level Member SD GTP's Avatar
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    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!
    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
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  4. #4  
    SE Level Member beast3300's Avatar
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    nice write up should be useful info for many
    Black 98 Regal GS: best run 13.95@99.75
    99 Red GP L36: 15.5 in 1/4
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  5. #5  
    TDCRacing
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    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.
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  6. #6  
    GTX Level Member MTXGTP's Avatar
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    quick question on the PEM does it HAVE to be both or can you get away with just the front.
    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
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  7. #7  
    I live here. SyntheticShield's Avatar
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    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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  8. #8  
    TDCRacing
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    i know the front is the worse...but i will let someone else chime in also...
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  9. #9  
    GTX Level Member webracin's Avatar
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    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

    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
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  10. #10  
    TDCRacing
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    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...
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  11. #11 Re: Determining Safe Pulley Size with L67 & M90 [*] 
    SE Level Member GP_Kid18's Avatar
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    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
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  12. #12 Re: Determining Safe Pulley Size with L67 & M90 [*] 
    TDCRacing
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    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.
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  13. #13 Re: Determining Safe Pulley Size with L67 & M90 [*] 
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    the stock catback flows extremely well
    2003 SSEi,
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  14. #14 Re: Determining Safe Pulley Size with L67 & M90 [*] 
    SE Level Member VALIANT's Avatar
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    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?
    4.2 Stroke
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  15. #15 Re: Determining Safe Pulley Size with L67 & M90 [*] 
    GXP Level Member Iron Indian's Avatar
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    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...
    Shawn W. Larsen

    2005 Pontiac GTO 6.0 LS2/A4... Stalled/Cam Only: 406 RWHP , 370 RWTQ

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  16. #16 Re: Determining Safe Pulley Size with L67 & M90 [*] 
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    im kinda new to all this and am looking to mod my 97 gtp. what does "kr" stand for?
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  17. #17 Re: Determining Safe Pulley Size with L67 & M90 [*] 
    The Blue One blueguy's Avatar
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    Quote Originally Posted by Jon View Post
    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

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  18. #18 Re: Determining Safe Pulley Size with L67 & M90 [*] 
    SE Level Member boofer22806's Avatar
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    some of you need to remember where us "new" gp owners are and where you were. Wouldn't it be great to learn from you experienced guys rather than waste money and defaming the GP image on worthless "Rustangs" as i have heard them called, and killed many times??? You have experience and knowledge, aka, a teacher, so please don't ridicule, but teach, share your knowledge so this model goes down in history more wanted and desired then that rice stuff...
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