Problems at higher boost! A cut that ISNT a fuel cut

[twiztedgsx]

alright so here's the deal... at higher boost levels my car is making a very violent cut, which is definitely not a fuel cut. i just installed my SBR manual boost controller, and turned the boost up to about 18psi to see what it would do. now, my fuel pressure at idle is high (48psi), so i should be getting a sufficient amount of fuel to the motor under boost. when the wastegate would fully open at 18 psi it would just cut and kill my rpms, but the motor would stay running, and would run fine after that, but only if i turned the boost down to 16 psi. i know it sounds like a fuel cut but my AF gauge is showing im about 2 notches away from completely rich. so it's not a fuel cut...so what else could it be??? i've researched some things and some say that i may need a bigger ignition setup to run higher boost, considering my stock coil is at 134,000 miles and they're supposed to be replaced at around 100k. im running NGK plugs (BPR7es) which should handle 18 psi just fine, but i really need to figure out what this cut in power is. so if anybody can help me figure this out i would REALLY appreciate it!!!

 

[CanadianTSi]

Fuel Cut has absolutely nothing to do with fuel. Fuel Cut happens when the ECU see's more than 2.55g/rev of Airflow.

FIrst thing to do would be check for boost leaks, then if you have none your only option is to turn the boost down until you have some sort of tuning tool that can "hide" the extra airflow.