Whats The A/r Of A Standard Rb20 Exhaust Housing

[sr20det510]

Hey Crew,

ive got an RB20 BB turbo on an SR20DET motor its had a few mods-

larger intake housing (4mm) and

larger V-Comp wheel to suit.

Im about to purchace an RB version of the disco potato which has an A/R of .64

I want the turbo to be as responsive as possible and i believe the A/R of the RB20DET is around .50

I guess my question is how much lagier will .64 be in comparison to .50

I can retain the .50 housing if i wish but im not sure it will reach 300HP at the wheels

The car currently makes 216HP on 15PSI

Looking to run more boost that why i want the Steel wheeled Diso Potato

Any assistance much appreciated

[grim32]

correct me if im wrong but i dont think the rb20 exhaust housing will flow enough to achieve 300hp at the wheels, i was also led to believe the housing is a .48ar.

[CEF11E]

yes thats the closest guess we can make .48... and it will not flow anywhere near enough...

I guess you are buying the RB 20 version because you have a t3 style manifold?

because the SR version is cheaper and there is nothing wrong with the standard SR manifold... you will be able to put out 300 with the SR manifold and a disco...

Also they spool great!!! have been in 2 cars with them.

[benl1981]

whats a disco potato? A turbo? What type?hahah

Dont Sr20 turbos have ceramic wheels aswell?

Edited November 21, 2005 by benl1981

[grim32]

yeah its a gt28rs. i think the sr20 uses a t28 and have steel wheels

[sr20det510]

Yeah ive got a manifold which has a T3 foot, Morrie is now doing an RB disco turb which has the .64 housing. going the RB route will just save me all the extra costs of having to convert back to SR stuff IE manifold oil lines, new plumbing etc.

I have been told that the RB20 exhaust housing can just scrape it into the 300's so long as it has a rear steel wheel and plenty boost..

I like reeee sponse.

ive gotta get myself a ride in a .64 SR

[CEF11E]

honestly you will be forcing so much boost thru your engine you will be risking head gaskets. dont do the rb20 housing you will regret it.

the gt28rs is a perfect turbo for a sr20. trust me you woll be happy with it.