How much boost is safe on stock S13 blacktop?

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My friend just got his S13 SR20det running, it is all stock with a small/medium sized FMIC. It purrs like a kitten and pulls good.We had some trouble dialing in the manual boost controller and accidentally boosted to about 20 psi a couple times. Nothing was damaged.My question is, how much boost can you safely run on an all-stock S13 without damaging anything?

thanks

[9240sx]

If he as a aftermaket fuel pump then id say 14-15psi.

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Can the little T25 handle that?It has a fuel pump from a 1987 300zx.

[Blown240sx]

Yea the t28 will hold 14 or 15 safe. Id make sure that manual boost controller is working right before you take it out and run it hard.

[ETTInnov04]

Since you have the T25 I wouldnt recommend anything over 13psi. Though the turbo is good for 15psi, they dont last long @14-15psi. How did you manage to boost to 20psi? You must be missing a wire somewhere because the SR has a factory boost cut of 15psi.

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yes we are missing a few wires.... but i dont remember a boost cut....does the S13 have a pressure sensor somewhere that detects that?

So keep it under 13-ish and we should be alright?

[Nismo_Freak]

yes we are missing a few wires.... but i dont remember a boost cut....does the S13 have a pressure sensor somewhere that detects that?

So keep it under 13-ish and we should be alright?

I wouldn't run more than 1 bar and you'll be safe.

The turbo can't outrun the injectors anyways.