I have a 90 TII with a to6 upgrade, fmic, street port, and a ecu from knightsports. The engine is brand new with only 2000 miles on it, I'm have a problem under boost. It feels like a fuel cut. But the knight sport ecu is suppose to get rid of all that stuff. The ecu is set for 10psi. I dont get it I've checked for vacum leaks found none. Its werid it wont boost full 10psi in 1st but when u get into 2nd and it spools for the full 10psi it cuts out. I have a boost controller but its does it when its off or on. Someone please help.

 

Try an FCD. You can buy them used for cheap. If it doesn't solve it, sell it. BTW, I think you mean T04 upgrade.

 

Yeah I was thinkin to try that too. and it is a TO6 The kit came from Greddy.

 

TD06 then

 

well I tried the Fcd today but still had the same problem. What should I look for next

 

Does is just lose all boost really quick or is it a gradual loss. IF it is a gradual loss of boost at higher rpms it might be the wastegate. It might needs some porting but then again you got the kit from greddy

 

Does this happen only past ~3800rpm?

Look at your secondary injector connectors. What often times happens is that the wires back out of the injector connectors, therefore, your secondaries don't come on.

 

Yeah I'm about to pull the intake off today and take a look. It starts to boost fine but aroung 6000 rpm is when it starts to cut out. It cuts out more in 1st and 2nd, but the rest of the gears are fine. It seems like a FCD to me but that not it. Sometimes the car will run fine and I can boost all through the power band with out it cutting out. I was also thinking maybe one of the injectors went bad.