15lbs of boost ???
 

I'm running 15lb's of boost.with the TKT cold air intake,DP,catco cat, and a R.B. C.B. The fuel cuts off at 120mph. and wont push anymore.Is it due to the stock ecu??Which ecu is best to buy?Also I think im leaning out.I have a Apexi auto timer but not sure how to read the voltage coming off the 02 sensor.when im @ WOT.it read's.85.is that rich enough?Thanks for the help.94 r2

If you are running 15 psi boost with the stock ECU and stock intercooler, you are asking/begging to buy a new engine. Bring it down to 10 until you get the ECU upgraded.

Adam

Yeah... you're lucky the fuel is cutting out. Most people doing that are worried about the engine cutting out :D. Go pick up an M2 ECU secondhand or something if you really need to push it..

-Manolis

I'll third that bro. You DESPERATELY need to turn that boost down unless you are wanting to rebuild your engine!! You can do what you want, but I hate to see FD's down for maintainance when they don't need to be.

while we are on the subject.. what do you think the limit of boost would be with a stock fuel system. with an upgraded ECU .. just curious, :)

I would think that about 12 and maybe 13 with the stock fuel system. But I wouldn't suggest over 12. It really doesn't cost that much to replace the needed parts compared the cost of a rebuild. But I know that 12psi is safe all day long.