Convert these numbers for me please

[BoeingMan]

Got my 2001 100% Stock GTS dynoed yesteday. These numbers are much more believeable than my previous dyno done by someone else. I now have a good baseline.

RWHP 401.1
RWTQ 441.1

Just for grins what do these convert to at the crank ??

Thanks in advance
Matt

 

[Dave T (BADVENM)]

What kind of dynamometer was it on? Mustang and Dynojet are the most popular.

 

[BoeingMan]

This was on a DynoJet. I had one done on Mustang type previously and the numbers were way off. It had said I had 459 RWHP/ 509RWTQ. Obviously, I wasn't buying it even though the tuner swore by them.

Matt

 

[ViperJoe]

divide or multiply by 0.85(?)

471.88 HP crank
518.94 TQ crank

Divide when RW is known to get crank(?)

Multiply when crank is known to get RW (?)

 

[Dave T (BADVENM)]

401 x 15% for Dynojet (25% or so for Mustang) = 461 crank hp
441 x 15% for Dynojet (25% or so for Mustang) = 507 crank tq

 

[BoeingMan]

marvelous and most excellent

thanks

 

[kcobean]

401 x 15% for Dynojet (25% or so for Mustang) = 461 crank hp
441 x 15% for Dynojet (25% or so for Mustang) = 507 crank tq

Not quite right actually. You can't just add 15% of the WHP number because it's 15% AFTER the drive-train loss. You want 15% of the BEFORE drive-train loss number.

401 WHP is 85% of 471.75 CHP (roughly). 471.75*.85=400.9875
441 WTQ is %85 of 518.75 CTQ (roughly). 518.75*.85=440.9375

 

[Buckeye Viper]

From and old, but interesting post awhile back (10/7/03 actually):

FWD cars - add 10 bhp to the wheel figure and divide the result by 0.9

RWD cars - add 10 bhp to the wheel figure and divide the result by 0.88

4WD cars - add 10bhp to the wheel figure and divide the result by 0.84

To estimate the expected wheel bhp from a known flywheel bhp just reverse the equations

FWD - multiply flywheel power by 0.9 and then deduct a further 10 bhp

RWD - multiply flywheel power by 0.88 and then deduct a further 10 bhp

4WD - multiply flywheel power by 0.84 and then deduct a further 10 bhp

------------------------------------------------

So I'd say:

467 bhp
513 btq