Laine D
Full Access Member
I spent almost the entire day fighting with this thing again. I got the timing meter Thursday and got timing dialed in about 8 degrees. I also took the slip pipe apart and packed it full of copper RTV a couple days ago. No exhaust leaks now, but it would still top out at only 6 psi when I test drove it. I switched back to the original wastegate and no change. Finally out of frustration I wired the wastegate shut and saw the boost jump up a little over 15 before I let off. So, I went back and changed springs in the wastegate. I changed springs twice and finally hit 14 psi. I'm currently using the heaviest spring in the kit which is 2.0 bar (29 psi). I have the rod turned in 5 turns past where it will slip over end of the wastegate, which according to the chart that came with the actuator should set opening pressure at 18.5. I'm going to put my hand pump on tomorrow and see how much pressure it actually takes before it starts opening before I make any more changes.
I'm still only seeing about 1 psi while cruising. Is that normal? Moderate acceleration brings it up to 6-7 and wide open pulling a long hill it tops out at 14. EGTs are still running a little high during a hard pull, around 1100 and creeping toward 1200 before I let off.
I am not Intercooled so my numbers are probably higher. What are your Rpms at cruising? At 55 I’m around 2000 and 3 psi of boost. It I foot it I can easily hit 10 psi, but my waistgate won’t hold any more than 10. I believe the factory springs on these turbos get worn out over time and it’s possible that the aftermarket one you have just needs a tighter spring.