A friend of mine put some efans on a huge chevy 2500 with more engine than he deserved and he said the fans made a noticable difference. It will lighten the load the engine has to turn.
Underdrive pulleys change the gear ratio of all those pulleys powered by the engine. It makes them turn a little bit less for each revolution of the engine. This means that the engine does not have to pull as hard on those other pulleys to rev up. The easier the engine can rev up the better throttle response and power you will have. It does not add any more horsepower to the engine but it does help more of the total power reach the wheels. If you do a lot of idling you may want to bump up the idle speed a bit to keep the alternator at the charging RPM.
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Wed, January 12th, 2011, 12:28 AM
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