Pontiac Grand Prix Forums : Grandprix

Me and a buddy was talking about this and I became curious, is there a sound difference with pulley sizes?

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OverKill PCM, PRJ 10.4 Wires, AutoLite 605, WizAir CAI, ZZP Plog, 2.5" Down Pipe, 3.5 Pulley, 180* Tstat, Borla Exhaust MECA SQ JL AUDIO 500/1, 300/4, 2-10W3V2, XR650-CSI, Kenwood DDX-6019 , Alpine amp and JL TR400CX center channel , 300 lbs of Dynamat.

smaller = spinning faster = louder whine

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04 Indy SS build #972
GPS Cam 1, TOG's, Tripleedgeperformance.com transmission-ported blower-build and tuning, PRJ wires, PRJ Rails, Stage 2 IC.

yes! the faster the supercharger spins, the louder and sooner you hear the whine.

If you've heard someone with a 3.0 or smaller pulley you can hear them screaming from a long way off at WOT

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+213,000 miles and counting
2000GTP: 3.4" pulley, Full SLP Exhaust/Headers, ZZP PCM, Wizaired style CAI, GM handling upgrade, F-body brakes, modified HID projector headlights, 180* T-stat, AL605, 18x9 Saleen Wheels, TE trans 3.29 gearing, Intense Input shaft

So would you be able to hear a big diff from stock --> 3.5? Because it already sounds sexy!

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OverKill PCM, PRJ 10.4 Wires, AutoLite 605, WizAir CAI, ZZP Plog, 2.5" Down Pipe, 3.5 Pulley, 180* Tstat, Borla Exhaust MECA SQ JL AUDIO 500/1, 300/4, 2-10W3V2, XR650-CSI, Kenwood DDX-6019 , Alpine amp and JL TR400CX center channel , 300 lbs of Dynamat.

I would think so as that is a pretty good drop.

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04 Indy SS build #972
GPS Cam 1, TOG's, Tripleedgeperformance.com transmission-ported blower-build and tuning, PRJ wires, PRJ Rails, Stage 2 IC.

i am thinking about going with a 3.4 or 3.2 any idea's which would be better to run out of the 2 ?

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I have a few more mods before I drop pulley size so I have no idea lol.

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OverKill PCM, PRJ 10.4 Wires, AutoLite 605, WizAir CAI, ZZP Plog, 2.5" Down Pipe, 3.5 Pulley, 180* Tstat, Borla Exhaust MECA SQ JL AUDIO 500/1, 300/4, 2-10W3V2, XR650-CSI, Kenwood DDX-6019 , Alpine amp and JL TR400CX center channel , 300 lbs of Dynamat.

I would think you would need some more mods before you drop a pulley size. And I would recommend to go conservative and go with a 3.4 first. Then tune it. If you don't have any knock, consider dropping to a 3.2. But going right from stock to a 3.2 pulley is just asking for trouble.

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Morad Parts Company

1997 GTP - 200k+ miles, PEMs, 3" SS Exhaust w/ Borla Mufflers, 3.4", 180* stat(summer), FWI, 1.84 RR, PT, SLP hood, KYB GR2s, GMPP Handling Kit, etc...

I have a 3.4 and it sounds great!!

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3.4", 3" cated DP, SLP Air box, TB spacer, 180* Thermo, "Bilemke Tuning".

i went from stock to a 3.4 and it made a pretty big difference in sound.

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---under construction---

2.8 GenV pwns 3.4 Gen3

Ummm...Yah Duh!!

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3.4", 3" cated DP, SLP Air box, TB spacer, 180* Thermo, "Bilemke Tuning".