Turbo Internal Wastegate Failure

[jcarney1987]

Okay I'm running KA24DE with 370cc injectors ISIS turbo from Enjuku and now I have an issue with the wastegate. It is internal wastegate and the rod is fully lengthened, but when I start to exceed 5500 RPM, the PSI on the Boost jumps upto 15 and motors starts to die out, Assuming leaning out.

Is there anything I can do to fix the wastegate issue?

[PapaSmurf2k3]

I'd start by hooking up some compressed air to the line to verify the actuator is actually working. If you disconnect it completely and keep it wide open yourself, does it still do it? If that's the case, then your wastegate is too damn small, or your turbine is too efficient AKA Boost creep.
One way to combat that is to increase the backpressure in your exhaust... so if you have straight pipe/dump, add a muffler. If you have 3" exhaust, step it down to 2.5.

[jcarney1987]

Thanks for the reply.

So I have my exhaust dumping right off of my O2 housing witch is about 1 foot of pipe and it is 3inch. So could that be a huge possibility why it's doing it?

[PapaSmurf2k3]

Yes indeed!