1983 Toyota Celica GT-S - Message Forum (Estimated Horsepower)

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Estimated Horsepower

Posted By:	terry
Posted On:	December 24, 2002 at 4:01 pm GMST

Here's the formula for estimating horsepower based upon 1/4-mile trap speed.  Formula's exist basing HP on ET but IMO they aren't as accurate.  IMO, and in the opinion of most racers, ET is a function of traction and trap speed is a function of horsepower.  Meaning, ET is affected by launch/60-foot times.  Race your car enough and you'll see ET's vary drastically based upon your 60-foot, but trap speeds will remain consistent.

Estimated horsepower = (trap speed/234)^3 x (weight of the car)

I'm going to estimate HP of my Celica.  First though, let's apply the formula to a Road and Track test of a notchback GT-S.

Here's their numbers: Test weigth = 2950, trap speed = 74.5
HP = (74.5/234)^3 x 2950
HP = 94.86

Here's my car: cone filter, Supra AFM, 1/4-inch larger exhaust piping (down, mid and tailpipe), catalytic bypass tube, Dynomax muffler, Mobil 1, Bosch 4 and embarrasing to admit it, a Tornado.

Test weight will be car + me, 3040 (based upon gross vehicle weight minus 180 lbs for each missing person), 81.3 trap speed

HP = (81.3/234)^3 x 3040
HP = 127

127 HP is kind of high to me.  The trap speed is from the Gtech.  Next month I'll be running the GT-S at Carlsbad so I'll repost HP estimate based upon Carlsbad clocks.  We can also compare track ET/trap speed vs Gtech ET/trap speed.

I think the formula is kind of accurate based upon my Trans AM estimated 320 HP and 3800 lbs runs 1/4-miles like a 327 HP 3400 lbs SS Camaro (13.8's).  The difference is my TA has an abundance of torque and the SS does not; SS hp comes from revs.

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Re: Estimated Horsepower - jing 01/11/04 (0)

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Message:	terry wrote: > Here's the formula for estimat > ing horsepower based upon 1/4- > mile trap speed. Formula's ex > ist basing HP on ET but IMO th > ey aren't as accurate. IMO, a > nd in the opinion of most race > rs, ET is a function of tracti > on and trap speed is a functio > n of horsepower. Meaning, ET > is affected by launch/60-foot > times. Race your car enough a > nd you'll see ET's vary drasti > cally based upon your 60-foot, > but trap speeds will remain c > onsistent. > > Estimated horsepower = (trap s > peed/234)^3 x (weight of the c > ar) > > I'm going to estimate HP of my > Celica. First though, let's > apply the formula to a Road an > d Track test of a notchback GT > -S. > > Here's their numbers: Test wei > gth = 2950, trap speed = 74.5 > HP = (74.5/234)^3 x 2950 > HP = 94.86 > > Here's my car: cone filter, Su > pra AFM, 1/4-inch larger exhau > st piping (down, mid and tailp > ipe), catalytic bypass tube, D > ynomax muffler, Mobil 1, Bosch > 4 and embarrasing to admit it > , a Tornado. > > Test weight will be car + me, > 3040 (based upon gross vehicle > weight minus 180 lbs for each > missing person), 81.3 trap sp > eed > > HP = (81.3/234)^3 x 3040 > HP = 127 > > 127 HP is kind of high to me. > The trap speed is from the Gt > ech. Next month I'll be runni > ng the GT-S at Carlsbad so I'l > l repost HP estimate based upo > n Carlsbad clocks. We can als > o compare track ET/trap speed > vs Gtech ET/trap speed. > > I think the formula is kind of > accurate based upon my Trans > AM estimated 320 HP and 3800 l > bs runs 1/4-miles like a 327 H > P 3400 lbs SS Camaro (13.8's). > The difference is my TA has > an abundance of torque and the > SS does not; SS hp comes from > revs.
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