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Underdrive Crank Pulley
Posted 22 August 2005 - 04:19 PM
Posted 22 August 2005 - 07:08 PM
The best reason to install it would be to help your acceleration by reducing the rotating inertia of the engine/accessories through each gear run-up (even then the gain is small).
Any measurable fuel mileage gains you'd see would be during city driving because of the abundance of rising RPM'S during shifting. Steady-state highway cruising would show almost no mileage gains.
If you live in a cold climate, the underdrive pulley could allow a battery discharge when you have a lot of accessories on at a stoplight or during slow driving.
Posted 23 August 2005 - 06:14 AM
i'm going with a full size lightweight crank pulley to avoid any issues. it will still be light weight so you'll get almost the same gains as you would with an underdrive pulley. fullsize pulleys still weigh like a few pounds less than stock and barely anything more than an underdrive.
another reason i like aluminum pulleys - ONE PIECE. these subaru pulleys with the harmonic damper on them piss me off as it's a failure point, the very fine rubber ring can detach from the metal. the stock pulley is really two seperate pieces of metal seperated by a very thin ring of rubber. that rubber goes and either your pulley falls apart or you'll have a mysterious charging problem where the inner part of the pulley connected to the crank turns faster than the outside part of the pulley...it slips. very annoying and a failure point that i have no need for.
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