N54Tech.com - Your Source for International Turbo BMW Racing Discussion
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Ancient8989 Ancient8989 is offline
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Question Single Turbo Help!? - 09-10-2017, 07:23 PM

I have a single turbo setup I'm running but I am having issues.

1. Jb4 G5 updated to the T16 hex
2. Using Jb4 ST flash using MHD
3. Using Mac solenoid but I bought from a different supplier and had to cut wires both it and a stock one are plugged in.
4. Was blowing off chargepipe and intercooler piping but that has been fixed.
5. Stock Mac valve was buzzing and vibrating violently.
6. Air intake temp sensor throwing a constant code.
7. Fuel pressure sensor throwing constant code.
8. Car likes to build boost but in higher boost it backfires and drops boost.

Basically a lot of bang pop when 75% or more throttle. Slowly winding the car out it usually doesn't drop boost but I'm still unsure of the issue.

So basically when I get on it the car likes to go until it hits around 4k rpm then it sounds like has some anti lag or 2 step and drops all boost to 0, at least that's what the gas gauge says. I can't figure out why. Has anyone ever experienced this?

Last edited by Ancient8989; 09-11-2017 at 12:58 AM..
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defineste90 defineste90 is offline
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Default 09-11-2017, 06:31 AM

log it and post it up
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ms335i ms335i is offline
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Default 09-11-2017, 08:41 AM

I have seen it before. You have a boost leak somewhere, check the lines that route to the wastegate and to your turbo compressor housing (pressure source).
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Ancient8989 Ancient8989 is offline
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Default 09-11-2017, 02:33 PM

I fixed the issue by setting the DWP to 0. FF is set to 20 as well, these fixed it not holding boost.

Last edited by Ancient8989; 09-12-2017 at 03:00 AM..
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