Quote:
Originally Posted by Nixlimited
This is highly unlikely. First of all, pulleys will not affect the turbos at all since the turbos are dictated by exhaust flow and pulleys aren't going to change that.
Second, underdrive pulleys usually underdrive by <= 10%, which means at best you are saving 10% of what the accessory parasitic loss is, which is small compared to the total output of the engine while cruising.
I'm not saying that you can't make more power from pulleys (warnings from reputable tuners notwithstanding), but they are certainly going to be very nominal overall.
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Lets not forget rotational weight with the 10% underdrive. Anything that allows the car to rev quicker will spool turbos faster but notice I said unorthodox pulley and light clutch and flywheel. Yes the pulley will be minimal in hp but the feel of the engine and the speed of the revs are noticeably quicker with just the pulley.