Hi, New Member. I have been searching the threads for answers to my problem. However have yet to find someone with the same problem. I have a series 2 GTS 25T auto. Motor is standard with factory turbo. Basic first mods include K&N pod filter with cold air box, intake air temperature sensor, x force 3 inch bell mouthed dump and front pump and G.F.B. bleed valve. The bleed valve was plumbed up in series with the factory boost solenoid to obtain a dual boost of 7 and 9 psi. This worked well with no spiking. Most recent mods include new 600 x 300 x 75 fmic and replacement of remainder of factory exhaust with 3 inch pipe with existing cat and mufflers replaced with 3 inch mufflers (no cat) and terminating at rear with a Bee-R cannon muffler with 4.5 inch tip. The factory 2 stage boost controller has been removed and bleed valved plumbed in between the intercooler piping (hot side) and waste gate actuator. I have also installed an Apexi SAFC but yet to have tuned. My problem is that I cannot control boost even with the bleed valve screwed in (no bleed off). Boost increases to 15 psi at 5000rpm and hits R&R (sometimes). I have tried plumbing straight from piping to actuator without bleed valve also have disconnected actuator arm and wired waste gate fully open and this resulted in huge lag but ultimately boost still peaked at 15psi. I have a separate boost guage (auto guage) and have checked this against a HKS guage with no discrepancies. Surely other members must have experienced this problem as my mods are basic and common. Appears my only option would be to remove the turbo and dye-grind the waste gate to increase the opening. Any suggestions to the contrary would be welcomed. NOTE: I am from Southland, New Zealand and the intake temperature at the time was 6 degrees celcius.
