Can I ask if the Mazda RX-8 is able to take 30psi boost from a turbo if the rotors and stronger seal is placed???I have never driven a rotary engine.Do you think it can take a higher boost if I change the rotors to a better one just like with pistons engines.{Sorry if I my english is bad,I live in an Asian country where english is my third language}

 

30 PSI is waaaay too much for an engine with a compression ratio of 10.5:1 without a major rebuild and strengthening. Best you could hope for with "mild" strengthening (eg, new apex seals) would be 15 PSI, and even that's probably pushing it. Stock, with no internal work, 5 - 8 PSI would be the max.

Lots more info in this thread. Happy reading!