Quote:
Originally posted by EddieSVX
Ouch! That sucks, hehe. My DSM's didn't take that big of a hit. I guess subaru drivetrains aren't as efficient. 
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Yes Eddie it looks like wheel measurements are approximately 32% lower than crank horespower on an SVX. It's hard to say exactly but they are definitely more than 29% lower. You can verify this by comparing the 160 something at the wheels measured with the stock ecu software with the advertised 230 hp at the crank from factory. That's a 29% loss if you assume the difference in measurement is all loss. It's probably more fair and accurate to say the measurement is 29% lower than to call it loss since these measurements are at the wheels after an automatic transmission (torque converter does just that converts power to torque). Since the car had good exhaust work and a k&n it's fair to assume actual horspower was slightly higher than 230 and thus the measurement was more than 30% lower than crank horsepower. We are actually very cautious in our statements and used a flat 30% to come up with our crank horsepower estimates based on wheel horsepower. What's really important is the difference between the 3 measurements taken rather than the "crank horsepower" calculated by them. We just knew it was important to include crank horsepower measurements since that is what the typical person is used to. The idea is to call to your attention not to comparing 281 with 230 but with 164, to get you to look at the graphs till you understand what you are looking at.