So I have a 91 Formula which I assume is one of the lighter V8 models in the 3rdgen world. It has a 350 TPI with a 700R4. I recently got my car dynoed on a DynoJet and it max a peak of 236.3hp and 337lb/ft of tq with a slightly bigger cam, SLP headers, Open exhaust after the Y-pipe, an optimal tune (tuned it on the dyno), milled L98 heads for a 10:05:1 compression ratio and its also been punched out to a 355 with an all forged bottom end. I also have a higher stall non lockup Torque converter.

Based on my track times with this car, the calculated weight is about 3050lbs with ME IN IT!!! and I'm 250lbs! Does that mean this car has a curb weight of 2800lbs?! I mean I have the interior completely stripped out of it down to the drivers seat, dash and center console and the drivers seat belt. No radio is in it right now either (but the speakers are there). But I didnt think it would make THAT much of a difference. I carpet was maybe 50lbs? The rear seats aren't heavy, the front passenger seat is maybe 25 lbs? The panels don't weight much either....

I'm having a hard time believing my car is this light... next stop is the truck scales I guess!

 

i think automatic Formulas were around 3350,so i recon yours is around low 3200s-tell us what you find after the weigh in

 

Pretty sure mine was around 3400lbs after subtracting my weight from the total.

 

Update on my car. It weighs 3160lbs without me in it. That means the wheel Horsepower should be about 260 wheel horsepower. But I just had it dynoed at 236whp.

Why? My guesses. I ran the 14.17 ET at 100mph (2.4 60 ft) when the DA was 715ft and the day I had it dynoed it was about 2800ft. I made the 1/4 mile run with slightly less than 1/4 tank and I weighed the car with half a tank of fuel.

Also it seems the TPI engine punches above its weight because the powerband is so incredibly flat. Look at that power curve!

 

this is really cool. Thanks for sharing!
Do you think the HP difference was due to elevation?

 

I think its partially due to the cooler denser air when I made the 100mph 1/4 run versus the hot muggy day I did the dyno run AND the fact I had only a 1/4 tank of fuel on the dyno run versus a half tank of gas on the truck scale. In fact, since you asked this, I went to a DA adjustment table and found the mph corrections in the 1/4 for the DA difference and also changed the weight for 3.875 gallons of gas at 6lbs per gallon and the Trap speed math for the weight and the corrected power equal 99.78mph or 259.8 hp to the wheels at 715 DA so its pretty close to account for errors. This would mean that at a DA of 0 feet my car is making 261hp to the wheels or 325hp to the crank through a non lockup higher stall torque converter and a 700-R4 transmission which assumes a 20% loss to the wheels.

With the mods I have, this seems pretty likely.