crazycat

I want to do a custom twin turbo set up. I have a 383 built for boost.
The turbos that I found for sale are 2-precision industries 60-1 they have .63 AR on the back side, they are the upgrade version which handles 630 hp each. I am looking for about 700s hp range. How would these spool ? Would they drop off early ? Would they be any good for me ? Thanks....

RealQuick

If they are T4 flanged 60mm turbos, they should support 600rwhp no problem.

I dont think you 383ci will choke those down at all. You could see full boost around 4000-4500rpm.

crazycat

Thanks, Real Quick. These turbos should support 700rwhp easy should it they. I was hoping that twins would spool a little quicker. I think that its a good deal on these turbos, But Iam really not sure If I should just go with a big single. Its mostly just going to be for street fun..

jerminator96

I think he said they would support 600rwhp because you originally said you wanted 700 hp. They should spool fairly quickly, he is saying they will be at full boost around 4-4.5k rpm.

RealQuick

They may spool quicker depending on turbine housing A/r, tuning, .... a few different variables.

crazycat

O.K thanks..A/R housing is .63 My goal is to hit 750 rwhp will these support that o.k ? I will have custom cam and some good flowing heads..thanks

crazycat

I just found out that these turbos are only t3 flanged, so will this reduce the flow of these turbos and not give me the 700 plus rwhp that I am looking for ?

RealQuick

You could probably make 700rwhp with a T3 flanges 60mm turbo. I would go with the T4 to help with the reduction of backpressure. The T3 turbine has a smaller opening than a T4. With two T4 60mm turbos, you should be able to hit 900rwhp no problem.

crazycat

Could I change to the t4 flange. how much would it cost ? thanks...