I was explaining to him that psi doesnt mean much without a turbob size reference.

Kinda like saying or its 10 long. 10 what inch, feet, miles..

He understood.

Explain to him a turbo doesnt add the amount its made for.

I.e. if a turbo can flow 300hp thats the max hp a car will output with that turbo.

The turbo isnt adding 300hp to the 100hp base the car alreadys has (400hp in total).

This is correct right?

Long time ago its how i was total. And it was the reason v8 dont run 350hp turbos. The motor would out flow the turbo and what not.

**Now to his question**.

If 2 cars run the same turbo but have different base hp. Will they need the same psi to equal the same amount of hp?

I know if 2 cars same build and same tuner will net around the same hp. Different tuners can net different hp.

But lets say car A has 100hp base and runs 10psi on X turbo and makes 200hp.

Now car B has 150hp base and runs the same 10psi on the same turbo.

Will car B net more then 200hp?

I read over the compressor map reading stuff and i know different cars need and output different cfm at different rpms. Giving the spool time, and seeing if the turbo is to big or small but trying to understand this hp output.