Odd 30FF case

armenh7 · 07-27-2023, 01:40 PM

Videos can be found at the Google Drive link with file names describing what they are

https://drive.google.com/drive/folde...Fwwl5GvLVCzczs

Hey guys, got a super weird issue.

I have this 135i with~115k miles. Has a 30ff, turbos feel laggy. Did a pressurized smoke test and found no leaks. Redid all vacuum lines. Tested the solenoids like shown in 50skid video and they seem fine. The exhaust note is super weird. With the wastegates open (no vacuum applied), the car sounds like an n54. With the wastegates closed (max vacuum applied), the exhaust note is SUPER raspy. The car also revs slow like a 328. The car has been flashed back to stock and apart from 30ff, no other fault codes. When boost does kick in, it's only about 4-6 psi at high rpms. I disconnected the mid pipe to ensure it wasn't clogged secondaries and nothing changed. Haven't found an easy way to test the cats in the downpipe minus o2 sensor removal. Also tried capping off the bypass valves and no change there. This car has absolutely no waste gate rattle.
I tried running both turbos off a single solenoid to see if that would change anything but it didn't. Both solenoids read the same vacuum and react the same.

armenh7 · 07-28-2023, 01:57 AM

Well that's not supposed to be like that lol
rear one was perfect though
https://drive.google.com/file/d/1UB8...usp=drive_link

07-27-2023, 01:40 PM	#1
armenh7 Private 10 Rep 60 Posts Drives: 2017 340i Join Date: May 2021 Location: Los Angeles, CA iTrader: (0)	Odd 30FF case Videos can be found at the Google Drive link with file names describing what they are https://drive.google.com/drive/folde...Fwwl5GvLVCzczs Hey guys, got a super weird issue. I have this 135i with~115k miles. Has a 30ff, turbos feel laggy. Did a pressurized smoke test and found no leaks. Redid all vacuum lines. Tested the solenoids like shown in 50skid video and they seem fine. The exhaust note is super weird. With the wastegates open (no vacuum applied), the car sounds like an n54. With the wastegates closed (max vacuum applied), the exhaust note is SUPER raspy. The car also revs slow like a 328. The car has been flashed back to stock and apart from 30ff, no other fault codes. When boost does kick in, it's only about 4-6 psi at high rpms. I disconnected the mid pipe to ensure it wasn't clogged secondaries and nothing changed. Haven't found an easy way to test the cats in the downpipe minus o2 sensor removal. Also tried capping off the bypass valves and no change there. This car has absolutely no waste gate rattle. I tried running both turbos off a single solenoid to see if that would change anything but it didn't. Both solenoids read the same vacuum and react the same.
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07-28-2023, 01:57 AM	#2
armenh7 Private 10 Rep 60 Posts Drives: 2017 340i Join Date: May 2021 Location: Los Angeles, CA iTrader: (0)	Well that's not supposed to be like that lol rear one was perfect though https://drive.google.com/file/d/1UB8...usp=drive_link
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