Wsup guys.

As you all know the stock boost on the evo is around 19 psi.

What is that maximum boost and hp the engine can handle with stock internals?

A 320 hp cast iron supra engine can handle like up to 600 hp on stock internals.

What do you guys recommend?

Would it be better to just get a larger turbo and lower the boost?

 

I heard around 400 whp is peretty safe for the evo, don't run more than 23 psi of boost on the stock turbo though.

 

if you get a bigger turbo, then you can lower the psi and still get more hp right?

 

no. psi is psi. volumetric movement is another thing. if u get a bigger turbo u can run high psi at a lower spin for ur turbo, which means more efficent. THat does not mean more psi. U will get more lag thou, so unless u up ur redline, it doesn't help that much at 20ish psi

 

Dude what are you talking about in that jibberish!? Yes, a bigger turbo can run at a much lower "PSI" and still help produce the same amount of horsepower. If it didn't what would be the point of upgrading? The difference is in CFMs. A smaller turbo will not flow as much at a certain PSI. A bigger turbo will flow more CFMs at a lower PSI rating. A bigger turbo will most likely lag more but that is one of the downfalls of a bigger turbo. Do to the natural size and weight of turbos wheel. And the Evo's internals are good for a good amount of HP. DSMers have been producing 400-500 HP on stock internals with their cars for years. No reason why we can't.

 

so....
a bigger turbo with the same psi would have more hp? but with a significan amount of lag right?