Hey guys i have a r33 rb25det motor in my r34 gtt. Its a build motor has been in there almost a year and it has always been fine.
I have a td06h 25g setup putting out 322rwkw on 20PSI with haltech p1000. I run a Greddy copy inlet plenum with a BM 80m throttle body.
Recently i changed my wastegate to a new turbosmart. I got confused with which hoses goes to the top of the gate and whiten goes to the bottom of the gate, a few trial and error caused a few runs down the freeway over boosting to about 30psi maybe a bit more.
I have fixed the issue of overboosting but now it idles at 1400rpm to 1800rpm, and once the engine is WARM the idle bounces between 1400 to 1900rpm, up and down.. all the time once warm. Driving and boosting is fine.
I thought maybe I'm leaking air, or blew hoses off, but i checked them all and seem to be fine. Also had a look at the inlet manifold gasket up close with a torch and the didn't seem like any pieces of it has blown out. i can see the gasket also has silicon on it too.
SO can anyone tell me whats the cause of the high idle rpm and the revs bouncing???
Any help would be greatly appreciated thanks