Turbo A/R for H23
 

hey im planing on turbo an h23 and need some help!plan on using a saab turbo 42/48 a/r is it big enough ? or i need a big 60 ? and 450 and AFC hack to run 8 psi max is it possible ? i have heard they got bad ringland and other shiet .... help would be great ! thank

Re:Turbo A/R for H23
 

I have a turbo h23, 450cc, and safc. and Iam useing the T-3 42/48 and I think its a bit to small, the turbo seems to lose power after 5,000 RPM. I blew the head gasket (I think) after 5 psi. when I took the head off, some of the head bolts were torqued down tighter than others. some were a MF to get out, while other came out with ease.

Re:Turbo A/R for H23
 

Go with a step higher than the .42ar. Besides you cant rev the h22 to high anyways. Below 9psi you ringlands inmy opionion should be ine just remember to tune it right.My two cents.

Re:Turbo A/R for H23
 

jesus. you want some turbo specs to use huh.

Well if my presumptions about the h22a cylinder head are correct and the head flows like a typical honda head. youll need a turbo around these specs here

a garret to4b compressor with a 50 trim wheel.
and a stage 3 turbine wheel with a .63 a/r for the hot side. If i were you id be looking into a gt28 garret with a .86 exhuast a/r myself.

anyways thats a good t4/t3 hybrid specs and should net you healthy power with a good spool up. just dont get sucked into using a 48 or a 63 turbine housing with a stage 1 turbine wheel. way to small for your engine to breathe at all.