Stillen Crank Pulley
If the diameter remains the same on the accessory pulleys you shouldn't loose any A/C or power performance. If they are smaller diameter, like some of their kits, then yes you'll notice a difference. I already order over a month ago from UR and they told be they should start shipping this week. Plus they are $10 cheaper then Stillen for the same pulley 
These are the SAME DIAMETER as stock but lighter. The difference from the smaller sized underdriven pulleys is that you don't have to get a non standard sized drive belt and your alternator output won't be compromised like it is slightly with smaller pulleys.
I was surprised when I saw this thread on g35driver: http://g35driver.com/forums/reviews/...ht-pulley.html . Hopefully, we'll see some solid gains with the Stillen pulley.
The stillen pulley is just the Unorthodox Racing pulley but $10 more. The pulley is lighter, but is not smaller at all, it's stock diameter. UR also stated they will not make the complete set of pulleys so no accessorie pulleys are coming for the g37. You should expect to see 3 to 5 hp gains.
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Joined: Jul 2008
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From: Chandler AZ
some 'time vs. speed' graphs that the dyno can produce would probably show the difference in the pulleys, as they're probably letting the motor rev faster, might be accelerating faster, not necessarily making more overall power.
I would love to see some time vs speed charts.
I would love to see some time vs speed charts.
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Joined: May 2008
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From: Jacksonville, FL/ Carmel, NY
The stillen pulley is just the Unorthodox Racing pulley but $10 more. The pulley is lighter, but is not smaller at all, it's stock diameter. UR also stated they will not make the complete set of pulleys so no accessorie pulleys are coming for the g37. You should expect to see 3 to 5 hp gains.
The ship date has been revised to the 15th of Aug. Patiencily waiting, another thing remember they are supposed to increase mpg.
