depending on the condition of the motor. I wouldnt go over 10psi with a t4 . Anything smaller as a t23 t3 I would stay around the 10-14psi . You have cast iron sleeves. Just get some pistons and rings and turn the boost to 16psi. Dont forget bearings.
Turboauto on here knows more about nonvtec f22s' than I do. When it comes to boosting them. My sohc vtec is boosted but we have the same bottom end.
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