Turbo guys I have a question-

My engine is a 91 turbo 2 rotor with p porting-

If I run a turbo with a high turbine A/R of around 1.0, the hot side
housing is larger and the exhaust velocity is slower. Since I only want
around 8 PSI boost, my reasoning is that I can wastegate some of the
exhaust around the turbo and it shouldn't be working as hard.
This type of turbo typically has a larger diameter turbine wheel, which
would result in higher centrifugal forces acting on the turbine blades.

On the other hand, a lower A/R turbine which is used for faster spool up
would have a smaller diameter turbine wheel, lower centrifugal forces, but
need a very large effective wastegate to keep the turbine speeds in check.

What do you guys recommend?

Kevin Alderman

Paul, this email is from my gmail, using Chrome, from my fedora laptop. FYI.
let me know if I need to adjust it.


Your email is fine.

I recommend a turbo tach and keep it under 80,000 RPM.
RPM will increase with altitude.

Paul Lamar

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