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Old 12-23-2002, 08:57 AM   #1
Scooby Specialist
Member#: 2532
Join Date: Sep 2000
Chapter/Region: South East
Location: Orlando, Fl
2001 2.5RS-T

Default Crank HP from chassis dyno

I build race engines for a living and use a dyno on a daily basis. The only thing is that I do motorcycles. In the motorcycle world everyone pretty much ignores the manufacturers claimed crank HP figures and assumes they are inflated. The only way to know what a bike makes stock is to dyno it stock.

One year we were building 3 bikes for a major team. We got 3 brand new bikes, put 300 miles on each and put them on the dyno. the highest was 119 and the lowest was 112. That's what 8-9% differance. What's 8-9% at 165hp.

I just don't see why you car guys are all wrapped up in crank hp. The only number that matters is at the wheels. If you had 500 at the crank and 100 at the wheels you'll still have a slow ass car. I just think it's mot realistic to use your dyno numbers as your baseline rather than claimed crank numbers.

It is possible to increase power to the wheels without working on the motor. I'm sure you could pick up some power by Superteching the the tranny and diff parts. If you're really well off you could use all ceramic bearings on all four corners and in the tranny and diffs. Motorcycle dragracers say they pick up 2 tenths just going to ceramic wheel bearings.
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