....and some of our vacuum gauges aren't all that accurate.Spec on open is 3.5 to 5.0 "/Hg.
Opening late, might be closing late as well at 20. Adjust to open 3-5,I'm getting an overboost code. Since it's opening late (8" vacuum) shouldn't I actually be getting LESS boost than specified?
Did you replace or adjust anything before this started?I wonder if something more than just adjustment. I don't know enough to know if the 8" could be the issue.
Start tracing the vacuum loss backwards from the line to the turbo back.I had a helper start the car and watched the actuator and there was no movement. I made sure something didn't go wrong and pulled vacuum once again and it moves just as it did before.
Where do I look?
I've rung up over 120k miles between three ALH cars (one only 11k miles) and have had ZERO turbo/vacuum issues. I have yet to touch anything, even hoses (kind of hate to admit that). 208k miles on one car. 168k on another: this one was from Minnesota; came to me w/o a splash shield (bad idea, especially in an environment like that).Times like these and I wish I had a waste gate and mechanical injection. Less fuss more reliable in my experience. Gone are those days.
Well, uh, no. If you make the actuator arm longer you are setting the turbo to boost even later then it is now.I think my new (non OEM off ebay) N75 was bad. I had another thread to help me understand its function.
I have multiple problems though. I believe the old N75 worked fine until the nipple cracked.
Based on the problem that I started the thread with and the feedback here, I believe my actuator needs to be lengthened. I'm completely unplugged from vacuum and now it no longer goes into Overboost limp, but I don't get boost until 2100 RPMS. I'm thinking I have the VNT nozzles open to a spot that acts almost like a waste gate turbo (laggy). BUT I'm glad to have that. Limp means I have a non turbo dose of fuel. It's horrible. I can't keep the car at 70 on the interstate when in limp.
When it gets warmer out AND when I have time, I'm pulling the intake, and turbo and will adjust that actuator to spec.
Times like these and I wish I had a waste gate and mechanical injection. Less fuss more reliable in my experience. Gone are those days.