What do you think?!?!

NYBladeZ

I was about to purchase a set of pulleys, however after having a discussion about it with Alex at Performance Motorsports he simply told me that while it is a cheap way to get a few HP in the long run it will mess up your engine harmonics. I took his word on in, I know he's seen more VQ motors than I have.

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2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold
2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling

daisuke149

hrmm generally pulleys arent designed for harmonic reasons. Simply a crank is developed.

Then they determine what rev's/ratio the other components need to run at in order to work effectively and then those sizes are determiend that way. Not really much to do with harmonics.

Actually in today's world since Alternators and A/C compressors are made generic, they get those first and based on that determine the size of the crank pulley.

So i can't see it really hurting "harmonics" but if someone gets the underdrive ratio wrong, it will hurt the electrics via the alternator not being as efficient. The A/C doesnt really get hurt it just wouldnt be as effective.

As for the OP, i sent a PM. light weight 2-piece rotors will free some some weight which doesnt increase HP, but lets more get to the wheels. After that, you could change the gear ratio but again that doesnt increase HP, just makes the car a bit quicker at the sacrifice of gas mileage and sound (cus at cruising you will be at a higher rpm than before)

GZ3

even if the pulley retains its stock size and is just lightweight?! From what i know our VQ's are internally balanced from the factory so adding a lightweight crank pulley will free up HP due to less rotational mass...hmmm more info is needed

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