Tflgen2
New member
- Location
- Indianapolis
As the title says, I have a boost fluctuating problem where it feels like a leak that opens up and closes. Power pulses under hard load. I have a relatively new stage 2 South bend clutch that is definitely not slipping.
I was not sure and replaced the N75 valve with no change.
I just installed a boost gauge (newsouth mechanical) and was very surprised by the results.
In 2nd and 3rd gear boost will build up to 15psi and immediate fall to 10 and boost back up to 15. It oscillates like this basically until I'm above 4500 rpm.
Sounds like a boost leak right?
Then I did a pull in 4th. Boost builds strong and hard to 20psi and holds.... I'm now at a loss.
APR tune adapting wrong? No obvious other issues.
See video: https://youtu.be/6sqWX-SZbuc
I was not sure and replaced the N75 valve with no change.
I just installed a boost gauge (newsouth mechanical) and was very surprised by the results.
In 2nd and 3rd gear boost will build up to 15psi and immediate fall to 10 and boost back up to 15. It oscillates like this basically until I'm above 4500 rpm.
Sounds like a boost leak right?
Then I did a pull in 4th. Boost builds strong and hard to 20psi and holds.... I'm now at a loss.
APR tune adapting wrong? No obvious other issues.
See video: https://youtu.be/6sqWX-SZbuc