383lt1impala

iTrader: (33)

Well its a twin turbo, ms4 cam. 4500stall around 3800lbs raceweight, around 600-730rwhp. And it has a th400. Looking to race in both quarter and eighth mile tracks. Its a drag car only. Also what tire is good? I would like to stay around a 26 but will change if its ne ssesciary.

Pro Stock John

iTrader: (34)

What rpm is the engine shifted at? 600 vs 730rhwp is a wide range.

383lt1impala

iTrader: (33)

Its going to be shifted at 7000. There's a few things that might change since its still not done but that's around where its gonna be.

Pro Stock John

iTrader: (34)

I think you'd want to run 26's or 28's.

For 26's you probably want to keep the gearing in the 3.25-3.50 range. I think for 28's you'd want to run 3.50-370's. I'd run probably 3.50's to start.

BlackScreaminMachine

iTrader: (17)

If you do not have a traction issues 26 is ideal, given the cam and stall, you should not be spinning. I like John's idea of the mid 3's for the gearing.

Sandmann120

iTrader: (1)

Thats a lot of cam, and a lot of stall. Aren't you also running a bunch of compression? I'd love to hear some more details on this build, sounds like a monster. What are your E.T. goals? I think I would definitly be looking at a tall tire on this build, and a good gear, I'd have to agree with mid 3's.

383lt1impala

iTrader: (33)

Hmmm I always believed a taller tire means more traction due it having a longer footprint? And I am at 12.5compression it has forged internals ported heads a victor jr intake with a demon 850 carb. I am aiming at mid 10s hopefully.

Sandmann120

iTrader: (1)

Yup, taller tire=longer footprint. What heads and head gasket are you running?

383lt1impala

iTrader: (33)

I'm running some ported 806s. They flow close to the 300 range @.600 and I'm running the trickflow (cometic) .053 gaskets.

Pro Stock John

iTrader: (34)

I went 9.40@143, 3.50, 3450 raceweight, 680rwhp, 7000 rpm shift points. I'd expect to run at least 10.00 with another 350 lbs. I'm thinking I'd still squeak into the 9's.

383lt1impala

iTrader: (33)

What tires and trans did u have psj?

Sandmann120

iTrader: (1)

I'm thinking he ran a TH400 as well. Don't remember the tire though. I like the sounds of your build, I think it has a lot of potential.

383lt1impala

iTrader: (33)

Thanks I appriciate it!

Sandmann120

iTrader: (1)

What are you doing for headers?

383lt1impala

iTrader: (33)

I'm on a budget but I'm using the truck manifolds fipped forward and upward. When I can ill get the stainless works ones.

XpEdItIoUs

iTrader: (44)

WOW, 12.1 compression is alot. How much boost are you going to run? Fuel?

383lt1impala

iTrader: (33)

Only about 7psi with c16. Good thing it has 112lsa so it can bleed some of the boost also. But I'm sure it will make good power.

XpEdItIoUs

iTrader: (44)

LOL thats like saying "Good thing my tires have nails in them so I don't have to let air out at the track" Yes jose im sure it will make excellent power.

383lt1impala

iTrader: (33)

Well reguardless 7psi is going into the motor. we'll see in a few months how it will go powerwise.

Sandmann120

iTrader: (1)

Do you already own the turbos? if not, might think about going a little bigger. I wouldn't think spooling would be much of an issue with that much compression.