OK... my 3rd GEN has the following.. 3"turbo back, and non sequential stock turbos, with an intercooler mounted inside the engine bay, nice and big .. i have the HKS fuel cut defencer, and my car is boostin like 14.5 psi and gets [fuel cut, miss fire, miss detonation] at 7,500 in 2nd gear, like 6,800 in 3rd gear and bit lower on 4th and 5th gear... anybody got any ideas? please help

 

When you went non seq. did you port the wastegate? Got a boost controller?

 

It sounds like you are in waaaaay over your head.

first you need to turn down the boost.
you need to remove the fuel cut defencer
you need to put a stock main catalytic converter back on.

then you need to go buy an aftermarket ecu like the pettit unlimited. I use it, i love it, Id kill for it.

then you need to get a boost controller. I suggest the greddy profec type S it works really well and sit with this setup for a whil and collect your thoughts
come back to us sane and we will continue to support your 7

the dirty is youve got a jankE setup and you need to level it to the ground and from there slowly rebuild a beautiful fast, raliable fd

 

I'm with Barban, put that cat back on and slow down. You jumped way ahead and need to realize that you're crusin for a bruisin. Get an ECU, get a boost controller, port the wastegate, upgrade the fuel. :]

 

OR get an exhaust gasket and make a copy out of stainless steel about 4mm in width with an exhaust hole diameter of 2.25". Sit it between your cat-back and midpipe where your gasket goes for exhaust restriction. That should provide enough back pressure to keep your boost steady if you don't have the cat. If you have the cat put that baby back on until you find out what you need to do for reliable power.

It seems you have gotten the mind set that go fast mods = no problems but speed..... that is the wrong mindset with the FD. TAKE A LOOK AT MY SIG, TOP LINE IN BLACK. If you are hitting fuel cut.... 1 bar of boost on the stock ECU.....god help you if you don't burn race fuel only.

AND FOR GOD SAKES GET A BOOST CONTROLLER and ECU. We don't want another I blew my engine and can't figure out why thread.

We are being hard so you will calm it down before you blow the engine. Remember 2 2mm seals that contain all your gasses, fuel, air, oil... and under 14.5 PSI with fuel delivery for MAX 12PSI that the stock ECU can detect = KAPOW.