Does anyone know the max psi the stock turbo for a 13b turbo rotary can handle?

 

i have seen people push the s5 turbos to about 15 psi, though i wouldn't recommend it. the turbo really starts to run out of steam early if you do that. the s4 turbos have been pushed almost that hard, but don't put down quite as much power since the manifolds are not as well engineered.

in order to push the turbo that hard, you need to do some work on the ecu and possibly some work on the fuel system. the ecu will cut fuel to the back rotor at 8.5 psi and that isn't a very fun thing to do.