Brad,
Thanks for posting and representing your company on the forum. My questions below:
Quote:
Originally Posted by otoupalik
The principal is the same. By under driving the accessories on the motor you are able to re-gain some of the lost efficiency. On the modern motors, you cannot replace the alternator, PS or H2O pulleys effectively, so we go to the crank pulley (but do not touch the dampener). The accessories are under-driven less then 10% and are well within the engineering tolerances.
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1. Why is there "lost efficiency" on an M car to begin with? Why would M engineers ship a car with a 21 hp deficit that they could have recovered?
We know M engineers are doing whatever it takes to extract every single hp out of the engine, especially given the competition the M3 is facing these days. What is it they are not willing to trade-off that you are willing to trade-off exactly? There is no silver bullet here.
Quote:
Originally Posted by otoupalik
In fact, if you drive at high RPM's more regularly, the under driven accessories will perform better as you will not cavitate the water pump especially.
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2. Out of curiosity, do you know when the water pump on the M3 cavitates? If you do, how do you know exactly? What tests have you run?
3. What is the extent of testing you have done on this product in terms of durability? How many miles on an engine and under what loading conditions?
Thanks again.