I've had the engine back out of the car recently due to a stuck wastegate pivot on the RH Turbo. Problem fixed and both wastegates were balanced to 7.5psi when refitted.
Before the engine pull, It would hold 19psi of boost (as tuned) this is with a manual boost controller, which I know was controlling the boost, because on a very cold day boost would reach over 20psi, and I would have to turn the boost down a fraction.
After freeing up both wastegates, I seem to not be able to reach more than 17psi, even testing with the wastegate lines unplugged.
I've performed a number of boost leak tests, I had found a couple of tiny leaks, fixed where possible, but nothing major.
I know when the turbos were freshly rebuilt with new wastegates, it could hold 19psi.
Question:
How likely is it that the wastegates are being pushed open by exhaust gas now, only allowing 17psi of boost pressure? Should the cracking pressure be set higher than 7.5psi?
I will also say, the engine is very much as simple as it can be, there's no safety boost solenoids, so the only thing in the equation is a hose to the MBC, and a tee from the MBC to each wastegate.
I've also checked out the re-circulation valves with a compressor, and they hold pressure well.
Hi all,
I've had the engine back out of the car recently due to a stuck wastegate pivot on the RH Turbo. Problem fixed and both wastegates were balanced to 7.5psi when refitted.
Before the engine pull, It would hold 19psi of boost (as tuned) this is with a manual boost controller, which I know was controlling the boost, because on a very cold day boost would reach over 20psi, and I would have to turn the boost down a fraction.
After freeing up both wastegates, I seem to not be able to reach more than 17psi, even testing with the wastegate lines unplugged.
I've performed a number of boost leak tests, I had found a couple of tiny leaks, fixed where possible, but nothing major.
I know when the turbos were freshly rebuilt with new wastegates, it could hold 19psi.
Question:
How likely is it that the wastegates are being pushed open by exhaust gas now, only allowing 17psi of boost pressure? Should the cracking pressure be set higher than 7.5psi?
I will also say, the engine is very much as simple as it can be, there's no safety boost solenoids, so the only thing in the equation is a hose to the MBC, and a tee from the MBC to each wastegate.
I've also checked out the re-circulation valves with a compressor, and they hold pressure well.
Any suggestions greatly appreciated.
Kane