BMW M3 Forum (E90 E92) - View Single Post - Why are all M3s rated at 414 Bhp ,when they actually produce 320 Whp at the Dyno...?

ssabripo · 01-22-2009, 01:24 PM

interesting thread.

so the hub dyno is supposed to have less drivetrain loss measurement than the wheel dyno? I'd be interested in some hard facts or measurements showing this, if anyone has anything

My understanding is that mustang dyno's do have some unaccounted losses, but that dynojets are pretty accurate as the measurement already takes into account frictional losses on the dyno wheel, etc.

I just did my dyno yesterday and the usual ~15-17% loss is fairly accurate from what I saw. Would be interested to see what the numbers would look like on a hub dyno

01-22-2009, 01:24 PM	#76
ssabripo HALA MADRID! 939 Rep 2,879 Posts Drives: camels & donkeys Join Date: Jul 2005 Location: Plantation, Fl iTrader: (7)	interesting thread. so the hub dyno is supposed to have less drivetrain loss measurement than the wheel dyno? I'd be interested in some hard facts or measurements showing this, if anyone has anything My understanding is that mustang dyno's do have some unaccounted losses, but that dynojets are pretty accurate as the measurement already takes into account frictional losses on the dyno wheel, etc. I just did my dyno yesterday and the usual ~15-17% loss is fairly accurate from what I saw. Would be interested to see what the numbers would look like on a hub dyno __________________ F87 M2 Competition, Sunset Orange, Exc, DCT. SOLD F80 M3 Mineral Grey/Sakir Orange, Exc, DCT... ED 6/2015 SOLDE90 M3, Interlagos Blue / M individual two-tone, ZCP, ZP2, ZCV, DCT, ED.
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