Ratio between CrankHP VS RWHP on a MUSTANG DYNO?

[///MCubed]

Do you know what the ratio between HP at the wheels vs. HP at the crank is for a MUSTANG Dynomometer is?

I have heard as high as 1.31 and others like 1.24 and 1.21

Any information would be greatly appreciated.

Thanks

[frayed]

It's 1.25. Keep in mind that a fully broken in 3.2L M3 motor puts out about 250hp, a bit over the rated 240hp. This will show up as 198 - 202 on the Mustang dyno.

[///MCubed]

That was my feelings as to what the ratio would be, but that is assumming 250 CrankHP instead of the 240 reported from BMW. So realistic ratio would be some where in the 1.21-1.25 from what I gather. If anyone else has any input I would like to hear it.

Thanks