XR6T VCT Issue / Flat spot under load

[RobbieGunn]

Hey XR6T Guru's,       2003 BA MK1 XR6T Manual T56

 

When the VCT is unplugged the car runs fine under load. When the VCT is plugged in the motor is hesitant and wants to stall when applying little amounts of throttle.

 

Ive changed Camshaft Positions sensors intake and exhaust side (Genuine), new VCT Solenoids, 2nd hand cam phasors w/ 108,000kms from FG and the issue is still there.

I took it to Shaw performance (!Big Regret!) and they assured me it was cam phasors. 

 

Im thinking its all tune related? 

I have also upgraded to a larger turbo (GTX3582RS Gen2) but have not had it tuned yet because I'm trying to find out what could be causing this issue.\

 

Thanks in advance fellas

[k31th]

well, 2003 XR6T's didn't come with T56's to start with, so it's an aftermarket gearbox swap, but that's neither here nor there.

 

having a bigger turbo and a tune problem is just asking for bad news, realistically.