Well, I have finally got my boost controller all set up nicely and it will adjust the boost well and hold the boost.

I am now having a problem whenever boost hits 15psi the car will cut out just like a fuel cut which I'm pretty sure its doing. I have set boost at about 13 - 14psi and it's running fine in full throttle all gears.

Any ideas what could be causing it to cut out whenever it hits 15psi?

DETAILS: Evo 5, turbo back 3" exhaust, K&N pod filter, Racepro Blaster external BOV(already on car, not my choice lol) and GFB manual boost controller.

Thanks heaps in advance! To those who followed my previous thread, it was free boosting because the vacuum hose can not be left open to atmosphere like some people seem to think! Instant fix when connected to turbo compressor houseing.

I have searched but I not find! My spark plugs look fine...

 

You probably need a tune. I remember when I first got my evo a long time ago and tried turning the boost up, it fuel cut. It's bad. Don't keep doing that.

 

FIXED!

What a good feeling. Hooked up a computer to the ECU and found that the air flow was set to 200% along with the extra air flow of the intake and exhaust was causing it to cut at fairly low boost. Raised it to 230% which should allow up to about 20-21psi boost. Running 16 though until I get a good tune and have the fuel and knock etc checked.

16psi still a lot nicer than 13 though! Also raised the speed cut to 260km.