- Joined
- Jun 26, 2002
- Location
- Apache Junction, AZ
My 744 has a Tial MV-S that I have been running for 6+ years, unit was new when installed and has been flawless eversince I put it on. I am running a Greddy Profec B Spec EBC that has also been flawless for even longer.
So as of last week all of a sudden my peak boost dropped for each setting, the EBC has High, Low and off which give me 3 boost settings. The Off settings which went off WG spring was running around 11psi and is now at 8psi, low was 16psi and is now 13psi, High was 26psi and is now 21psi. This issue came on very sudden, I was out on a tuning drive to get more e85 and things were going great at 26psi until about 20 min into the drive when i left a stoplight and noticed that the boost was all of a sudden lower and the power just wasnt there.
I have swapped out the Greddy unit for another known working unit along with a combination of control unit and soleniod and both units produce the same results of boost.
I have pressure tested the car pre-turbo to 30psi and found no boost leaks, none of the WG hoses or lines leak, nothing at the intake manifold or any place else. So because of this I am fairly sure that there are no boost leaks.
That leaves me to think the issue has to be the WG, being that the External unit Dumps to atomosphere everything sounds 100% normal, the peak boost is just lower.
So any idea's of what I should check next? This engine has around 1500 miles on it since I rebuilt it and otherwise everything has been perfect including boost control up until last week when all of a sudden I lost a bit of power and boost.
Thank you for the time to read and any help you can offer, the car has been running great and I wanted to finally take it back to the strip to finally go for proper 11's on MS but with this boost control issue it makes it harder to tune without boost being where it should be.
Mike
So as of last week all of a sudden my peak boost dropped for each setting, the EBC has High, Low and off which give me 3 boost settings. The Off settings which went off WG spring was running around 11psi and is now at 8psi, low was 16psi and is now 13psi, High was 26psi and is now 21psi. This issue came on very sudden, I was out on a tuning drive to get more e85 and things were going great at 26psi until about 20 min into the drive when i left a stoplight and noticed that the boost was all of a sudden lower and the power just wasnt there.
I have swapped out the Greddy unit for another known working unit along with a combination of control unit and soleniod and both units produce the same results of boost.
I have pressure tested the car pre-turbo to 30psi and found no boost leaks, none of the WG hoses or lines leak, nothing at the intake manifold or any place else. So because of this I am fairly sure that there are no boost leaks.
That leaves me to think the issue has to be the WG, being that the External unit Dumps to atomosphere everything sounds 100% normal, the peak boost is just lower.
So any idea's of what I should check next? This engine has around 1500 miles on it since I rebuilt it and otherwise everything has been perfect including boost control up until last week when all of a sudden I lost a bit of power and boost.
Thank you for the time to read and any help you can offer, the car has been running great and I wanted to finally take it back to the strip to finally go for proper 11's on MS but with this boost control issue it makes it harder to tune without boost being where it should be.
Mike