Soaring

I don't know Nathan. I'll get with the boss and get back to you with a PM.

1970 mach1

RPM = MPH X RATIO X 336.00 divide by tire height 70 mph x 4.30 gear size x 336.00 get the total and then divide by tire height 28" RPM =3,612 At 70MPH with a 4.30 rear gear & 28" rear tires you will be doing 3,600 RPM

stangrr66

Awesome,yeah it was like that. I knew there was formula for that.

stangrr66

Thanks Soaring, I appreciate it.

Soaring

4.30 gears for a road race?

stangrr66

HAHA No, i think he was just using that as an example.

But I did my own calculations, and if Im going 180MPH, with 3.33s, with 28in tires, then the engine is running at 7020RPM

Im saying that i'll go that fast, but... i would be cool lol

1970 mach1

Before you ask all these questions you need to decide what your going to do with a Mustang that has 750 hp. If your running sport car tracks and Road rallys you don't need to be tubbed. You need to lower center of gravity of vehicle to the ground for better cornering, you sure would not want to sub-frame or tub it for that type of usage. Tubbing and sub-frame is for Pro-Street cars and 1/4 mile cars. You stated your not interested in that so, what are you asking for ? You need to figure out how your going to use the Mustang than we can give you some help. Also with that kind of Horse Power your going to be breaking all kinds of stuff and if your not a professional builder you will never pass any Tech Booth at any Track. There are build rules for all race cars, Formula 1, Formula G, 1/4 Mile cars, NHRA, SCCA, and etc. With 750 HP you need to be an expert builder and driver or your going to injure yourself and probably other people. Do a little more research in race cars with that amount of power. Go to the tracks you think you would like to race at and talk to the drivers and owners of them cars. Get books and research web sites that apply to the type of vehicle you would like to build. That kind of power your going to need a pocket full of money. A car that you talking about will cost about $60,00.00 to over $100,000.00 to build. If you can do the work yourself and pass inspection. My friends have these type of cars that I have helped them build, but even I know my limitations when it comes to this type of build I get professional help. I've built alot of vehicles in my life, the first 13 hummers I built and test drove for the goverment, but I still don't have the expertise to be building a car with that kind of hp.

Soaring

I know. I was just ribbing him. Try a different calculation. Try using mid 350 gears.
What will be your speed at 5K RPM in the highest gear?

stangrr66

You're definately right, I do need to do more research, but I have the powerplant now. Earlier I stated that I didnt think I would actually race but wat the ability to. I htink this kind of setup would more for show, than actual race use. I assisted a professional builder when we built the engine up, so the normal price of a that engine itself is around 12000, and I wasable to get for 8200, basiaclly a steal. Now i need a worthy suspension setup. At this point I was curious how others could help me out. Appreciate the advice, and I will actually hit u pthe tracks, and talk to some of the pit crews, drivers. and see how they would approch this...idea. Thanks

stangrr66

alright lets see if I did this right

((5000 x 28)/3.55)/336 = 117.37MPH

Thats still pretty fast. And I'd probably get a quicker 0-60 time