Which A/R for ITS GT76 ?

[Kristian_Wraae]

I've got an ITS GT76 DBB turbo with an A/R 0.84.

The turbo is a twin scroll.

Which exhaust housing should I choose in order to maximize spool but without choking the engine? If I get 500 hp out of it I'm happy.

The engine is a built 7M (no head work except BC 264 cams) with a divided T4 exhaust manifold made by Ron Ramirez and the intake manifold is a short runner also by Ron. Intercooler is a 4 inch Treadstone and the exhaust is a 4" system. Wastegate is a Tial 46 mm.

 

[Kristian_Wraae]

No one has any idea if an AR of 0.84 on this turbo will choke the engine?

 

[Turbo Drifter]

That a large turbo to only be shooting for 500hp. The turbine you have now will be fine for that goal.

 

[Boost Lee]

.84 should give you no problems with top end power/choking off.
And will be more than enough turbine to make a reliable 500RWHP
(as long as you have the supplied fuel to make it happen).

Jeff

 

[Kristian_Wraae]

Thanks guys.

Yes the turbo is big for what I want, but I got it for next to nothing and it is almost brand new. I know Ron was running a GT76 when he had the setup and he made around 520 rwhp without too much lag. So I figured it would do ok.