Hi All,
I had a good search through the forums but wasnt able to find anything that would help much, hoping you experts might be able to shed some light on whats going on.
Yesterday I bought a GFB adjustable boost valve. I have a 93 R33 GTST which has a factory electronic boost controller, that seems to boost the turbo from about 5psi to about 7psi once the engine hits about 4500rpm ...
To install the after market valve/controller, i disconnected the factory electronic controller (solenoid), blocked off the hose that vented pressure back into the air inlet, and connected the after market controller between the two hoses that USED to go into the factry electronic controller (i assume the bleed valve around the wastegate?)...... Firstly ... im hoping this is correct. (i can get some pictures posted up if your note sure what I mean).
Anyway, I wound the valve right down to the lowest setting (supposedly factory boost for the turbo) and gave the car a run .... no problems driving the car normally, however when I start to nail it a bit in second and sometimes third .. when the car reaches about 4000-5000rpm, the boost suddenly skyroockets on the guage, however i loose boost to the engine, and thre car starts to jolt like boost is coming on, off, on, off, on .. etc etc ... almost like its reached peak boost? or not enough air in? no idea!!
Can anyone help with this? I dont have much experience with moddng engines, though I did have a friend helping who knew a fair bit about it, but its got him stumpped too. I tried it both with the factory controller connected to power, and disconnected from power (thinking it may have been an ECU thing?) .. still no good.
Any help would be greatly apreciated.
Thanks