[limited777]

Been trying to figure out how to convert awhp back into fly-wheel hp....

anyone know? I dont need exact numbers just a round about.

for example my cars 325awhp 340awtq what would that be at the flywheel?

[neptunian588]

i think that awd loses like 20-25% of the power to the wheels so i guess try to figure the power from that

[BuzSTid]

the vehicle specifications note the basic HP/torque ratings... calculate a percentage drop with your base line dyno chart. that should give a fairly accurate representation of your parasitic losses.

[neptunian588]

use the search, i remember a couple instances where ppl have asked the same ques. and i think its was a 20-25% loss

[GilMikalian]

So I went to the Harman Motive website and checked out their dyno plots in the Gallery section. In stock form, they got 240 wtq & 233 whp. Keep in mind the Mustang Dyno is apparently quite stingy so these are conservative numbers, not to mention each vehicle will have a variance to some degree. So taking these numbers and using SOAs numbers of 290 tq and 305 hp, we get about losses of 17% for tq and 24% for hp.

So taking the Mustang Dyno ratios, your figures of 325 whp = 427.6 hp at the flywheel (325/76%) and your figure of 340 wtq = 409.6 tq at the flywheel (340/83%).

Those are some healthy numbers...assuming I haven't totally botched the numbers!

Wow, I must be bored. If anybody wants the excel sheet that will convert your wheel HP/TQ to flywheel HP/TQ (along with the assumptions above), PM me and I'll shoot it to you. You just plug in your dyno numbers and you get the figures. Of course, if you have a baseline chart for your vehicle, nothing beats that.