My bro owns a 13bt rx4 (thats how I got into rotors ) but anyway he bought himself a boost controller and a boost guage to check the boost etc, well the boost was on like 4psi.. is that stock? Its a stock 13bt by the way, with fuel management, k&n airfilter.. and thats about it.

How much could he safely boost up the turbos? He's got it on 6 for now.. but hes thinking of boosting it up abit more to its potential

Any ideas?

 

My bro, I'm thinken, "Steve" I know I'm a hick liven way out in the sticks here in Jefferson Oregone, so don't be a red neck and show evey one how inbred I am, I've owned my 76 RX4 since 78 got it with 32k mi on it, and brought all my kids home from the hospitel, and now there all in college, well it as twin turbos and I have pushed it past 8 psi and plane on pushing it to 15 and seems to be doing just good, pm me with a e mail adress and I'll send you lots of pics