Alright. Im gonna start this off by saying that this is all theoretical and i'm hoping to get some combined wit on how to do this. My c4 is a 1984 and a buddy of mine and I are planning to pull the motor out and throw in an ls3. Obviously the ls is a competent motor to begin with but when you up to the ls3 youve got more wiggle room in terms of HP and Torque. My question here is, what would i have to do to an ls3 to get it to roughly 600 hp and torque to the rear wheels? Here's my resoning for these numbers. The 2017 dodge hellcat makes 635 HP and 591 Lb ft. Of torque to the rear wheels on dyno numbers. This puts it at roughly:

1 HP for every 7(ish) pounds of curb weight

1 Lb. foot of torque for every 7.5(ish) pounds of curb weight

the C4 can accomplish this power to weight ratio much more easily due to it weighing almost 1000lbs less than the hellcat. Ive run some numbers all with the corvette's curb weight being 3100lbs (also heard that its curb weight is more around 3200lbs but wasnt sure). And 500 hp and torque seems to be the point where it starts matching the hellcat's power to weight ratio. Obviously this car is 30 something years older than the hellcat. So its going to suffer from the inability to lay this power down even if the corvette can reach those numbers to the rear wheels, purely because it doesnt have the electronics and mechanical technology to do so. But that isnt going to stop me from trying. So guys, Can we make this work? Waiting anxiously to hear your thoughts.

 

One of the guys in the Vette Club I belong to has a 84 tricked out for the track. 502+ block, automatic and who knows how much HP it makes. You're trying to go for the same arena I assume, so how do you plan on putting that kind of power to the ground? You planning on back-halfing the car and putting something like a 9" in there?

I'm guessing you're going to have to get rid of the C-beam and make a cross member for whatever tranny you plan to use. Maybe talk to some of the racers here, they may be able to steer you in the right direction.

HP comes with costs, be sure to have it all figured out before cutting or removing anything so you don't turn your car into a parts car.

My opinion.

 

Plenty of us here have c4's with the same power levels or capable of more than a hellcat.

There are a lot of items that need to be looked at once you get over 500hp in a c4.

For you it should be easier if you don't care if it is a rat, but even still....

yes, it is possible. if you are building an engine to make power why set limits based on power to weight ratio?

 

twin turbo on that LS3 will make more than enough to outrun the dodge. just ensure you can put that down with good tires & drivetrain.

 

Build turbo. Won't have all the torque right off the line, blowing tires off and breaking ****. Unless you trans-brake it.

What kind of race? 1/4?

 

I think ^^^ is right. You could tune the turbo to not make much boost down low so it can hook up.

 

I've seen stock Hellcats at the strip running 10.70's with drag radials. Just shoot for that number.

 

Rear Diff/IRS is the weak link with that much power.

 

Thanks for all the suggestions! Will be posting a page on the car once i start building it!

 

Hellcat Killer? This will do it and you prolly don't have to change a thing!

 

Hahaha. I like your style. I wish i had that kind of roadway where i live. But lowcountry South Carolina is nothing but straight-aways and I-95