Quote:
Originally Posted by fukamoto
Okay. Using your formula of 320whp/(1-drivetrain loss)
320whp / (1-.3) = 320whp / .7 = 457hp
So, um, using your calculation, it is above 450 to the crank.
Am I missing something?
If I use your 25%, despite the fact I have dyno numbers which represent 29.3%, it would be 320whp / (1-.25) = 320whp /.75 = 427hp. How is that such an outrage from 450hp?
You can't "average" out a generalization for drivetrain loss for ALL AWD, RWD, FWD cars. What you can do to get an accurate hp reading is to run your car on a dyno stock, run your car on the same dyno under similar conditions modified. You use those numbers to extrapolate a reasonable estimate of crank hp.
Here is how I calculated 450hp. Let me know if its unreasonable. I'd love to learn a better way.
Stock car: 212WHP Stock crank HP: 300HP
212WHP / 300HP = 0.70667 - 1 = 0.2933 drivetrain loss
Modified car on the same dyno: 320WHP Stock crank HP: X
320WHP / X = 0.70667
320WHP = 0.70667X
320WHP / 0.70667 = X
X = 452.83 Crank HP
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That's the correct formula:
320whp/(1-drivetrain loss)
I just use the average of 25% for awd cars. I've been using that on mine for my calculations. But you're right, that doesn't apply to all.
Anyways, the bright side of this is that I kept bumping your thread to the top
