supercharged 429?

[xyfalconsrock]

Ok i just heard my uncle is building a AC cobra as a kit car.It's gonna be ready in a year anyhow.He said about chucking in an injected 429(7.0L) and then he said he was gonna put on a blower.But not one of those centrafugel ones, the ones that sit on top of the manifold like a 6/71 or somthing.My question is; with that kind of set up and on say 10 inch road tyres, who fast would he be running the quarter?

thanx

[thunderbird muscle]

What kind of tranny, rear end gear? List all you can and you will probably get a decent estiment.

[xyfalconsrock]

i noe, sorry i dont have much more infomation about the car but its not all for sure yet.i new i couldnt get a great estimant with so much doubt but thanx.i hope to update when i noe more about it.

[jlewis]

well, for starters a base 429 was rated at 380 HP but lets be more realistic and say it was actually about 450 HP and nearly the same torque(that is much more realistic BTW, they were seriously underrated). Then if you run a blower at say 8 psi then you are treating the engine to approximately 60% more air than it would get naturally so subtract some efficiency losses and I'd say the engine should make somewhere around 700-800 HP. i hope at this point that you have some good parts in the bottom end. subtract about another 15% from that if you're running a slushbox (auto) and about 10% if manual. so you should be able to put 600 HP to the ground. Geez that's a VERY rough estimate but you can see where I'm heading. None of that's even considering what head work you do or what cam you run if you run other than stock parts. Also it will take a lot of carb and exhaust to support that kind of power. i'm sure exhaust won't be a problem if you have cobra sidepipes. Maybe a couple of 750 Double pumpers on top of it? Or a single 1000? Wooo, I'm drooling here. Also plenty of toluene in the tank or straight up race gas when you crank the timing and give it a hard time

[jlewis]

Also, a 600 WHP vehicle that weighs 2200 with driver (this is what I'm guessing for a cobra) should run 9's in the quarter assuming you can hook all that power and drive perfectly, so expect 10's from it on 10 inch street tires, maybe 9's if you're really good.

[xyfalconsrock]

thanks for the report and estimate.BTW itll be an injected 429, i cant wait to see it ready.thanks for the help.