RWHP Calculator

[Tallboy]

Kinda neat. Plug your 1/4 mile numbers in [for those of you that have actually raced your car] and your car's weight and it gives you a RWHP figure.

http://www.s-series.org/htm/calc/hpcalc.htm

[HwyCruiser]

Excluding driver weight :o it's pretty darn close. 454 rwph from ET and 457 from mph. To show my idiocy, what's brake hp?

[Joe Walsh]

The HP it gives me is a bunch more than I've dynoed....347rwhp vs 317rwhp dyno
What weight have you plugged in...4400lbs?, 4500lbs?

Maybe I'm very good at the drag strip....;)

[Bluerauder]

The HP it gives me is a bunch more than I've dynoed....347rwhp vs 317rwhp dyno
What weight have you plugged in...4400lbs?, 4500lbs?

Maybe I'm very good at the drag strip....;)
Oughta be about 4339 lbs for your skinny a$$, Joe. (4164 + 175 ??) ;) :rofl: J/K

[Joe Walsh]

Oughta be about 4339 lbs for your skinny a$$, Joe. (4164 + 175 ??) ;) :rofl: J/K

HEY! I've been drinking Stouts and Porters and have 'beefed up' to 190 Lbs!!:D

[HwyCruiser]

I used 4200 lbs. i gain 30 rwhp when I get in it though. :D

[TripleTransAm]

370 rear wheel horsepower for my LS1's 107.6 mph trap speed? I don't think so...

(dyno'ed at 310 rear wheel hp)

The spread between the ET-based rwhp and the MPH-based rwhp for my particular car shows it's not suited to today's modern motors (with torque curves slightly different than pre-90s motors).

[Mike M]

Right on the money for my car, it says 419 RWHP and I just recently dynoed it at 412.

I checked my Camaro's numbers and it was very close as well, 748 engine HP.

[Tallboy]

Excluding driver weight :o it's pretty darn close. 454 rwph from ET and 457 from mph. To show my idiocy, what's brake hp?

Brake Hp is measured at the crankshaft.

[Hotrauder]

Brake Hp is measured at the crankshaft.

Damn, that Logan is right about that Tallboy! Dennis:D

[Smokie]

Pretty exact based on ET, 400 rwhp. Way off base on trap speed, 439 rwhp.

[HwyCruiser]

Brake Hp is measured at the crankshaft.

Since the calculator put mine at 545-548 hp at the crank, it must figure in about 17% power train loss. Is that pretty typical for an automatic transmission?

[Tallboy]

Since the calculator put mine at 545-548 hp at the crank, it must figure in about 17% power train loss. Is that pretty typical for an automatic transmission?

Yep. I usually figure our drivetrain eats up about 20%.

[merc6]

BHP is what sells cars ;)