Just for better understandind about the concept of the UDP:
The gains from the UDP are realized mostly from a reduced weight crank pulley NOT the underdrive that spins the accessories slower! Yes, there is power to be gained by underdriving those parts, but the idea is to have less weight (mass) for the engine to have to "spool" up. This is mostly true when you are taking a 1/4 mile run and the engine is forced to 6000RPM, shifts, drops down and now needs to climb in RPM's again. This happens multiple times throughout the run. The less weight "hanging" on the crank snout the easier it is to spin the engine up. Why do we (or just me)remove the balance shafts?
Similar to putting lightweight wheels on your car. If you can reduce the weight on the 4 corners on the car by a few pounds each, the benefits are multiplied.
No problems with my UDP. No maintenance. No worries. Oh, BTW, my battery weighs 13.5 pounds, charges perfectly.
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PT powered PT with:
Fully built HRC Turboed 2.4: Wiseco pistons, T2 rods, Port & Polished head (Bob Special) with oversize Stainless Steel valves, #14 Crane Cams, AF/X UDP, No balance shafts, Custom 3\" downpipe, 3\" hi flow exhaust, Ported GT intake manifold, Bored Throttle Body, 30 lb injectors, Water/Alc. injection
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