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I agree - numbers are a bit too high to believe?? (archive)
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Posted by AndyM on January 28, 2001 at 17:21:16:

In Reply to: Herb: Your HP figures are a bit excessive posted by LM on January 28, 2001 at 17:01:46:


You said 353 hp 367 ft-lbs. 353RWHP equates to 415HP (353/0.85 = 415.2941). I find that a little hard to believe that a stock M5 is putting down 415HP to the crank. Do you have any mods?

I agree... I read the numbers and I am having a real hard time believing them.. I am not calling you a liar,, I just don't believe what the Dyno guy gave you.

I have not yet seen ANY M5 dyno over 340 HP at the rear wheels. I espcecially don't believe the torque number. Hell, the thing has 369 lb/ft stock at the crank... And you are being told it has 367 at the rear wheels... that implies absolutely no loss in the drive train??? :(

Was this a chassis Dyno (ala Dynojet") ? If so, it needs some recalibrating. My modified E39 M5 recently dyno'd at 335 HP at 6750 RPMs and 326 lb/ft of torque at around 4000 RPMs - at the rear wheels. This is in keeping with what this engine should be...unless you really start mucking with internals or put a blower on it. You would need an air conditioner blowing real cold air directly into the intakes to get anywhere close to those numbers.. IMHO...



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