I have a T3T4 with an internal wastegate. The old 8 psi wastegate I was running hit 6 psi till about 6000 then climbed to 8. I put the 10 psi wastegate in and now it runs 4 until about 6500 then climbs till 10. The vac line is t'd off another line, and I replaced that with a fresh vacuum line and no luck. Anyone have ANY advice?

I am very confused



LE61T PTE6262 Powered

Note: it was originally attached to the T for the Map and intake manifold, then i tried straight to my vac block, worse, then I tried from turbo to WG, No change. I am adding in a boost controller no, otherwise I am switching back to the 8 psi gate


Edit#2 - Added BC in and no change until it was screwed in a lot, hit 14 by accident, so I parked it and backed it out 1 turn. good enough for me




Edited 2 time(s). Last edited Sunday, August 01, 2010 11:57 AM


LE61T PTE6262 Powered

Maybe the wastegate is binding and sticking partially open???




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idk how to check that. I installed this one just like the last one



LE61T PTE6262 Powered

Just sounds like a boost spike from too small/large of a turbo. What are the specs?

Put the restrictor in the T-line to your boost gage if you have't already. I had that problem getting false spikes.

You can check for binding on the internal wastegate by hand if you unhook the actuator rod - it should flop open and closed pretty easily. It's just a bushing so it may have a little drag but should fully open and close by 1 finger.

You're boost signal line to your wastegate actuator should be coming right off the turbo or about a couple feet past it. You can pick anywhere in the intake tract before the TB butterfly but the closer to the TB the slower it will likely react.