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Thread: E36 Turbo Problems!

  1. #1
    Join Date
    Apr 2022
    Location
    Duluth,Georgia, united st
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    6
    My Cars
    1998 328is turbo

    E36 Turbo Problems!

    Hello!

    I could really use some help because I am going crazy, I will try to keep this short.

    1998 328is Turbo,

    Garret gt30 turbo setup (almost identical to TRMS)
    * Some reason I decided to build it out myself and literally brought half the stuff from TRM along with my tuning. My exhaust work was done at TRM by someone Michael works with.

    The car is currently running on E85 and a stock ecu with the TRM tune for E85.

    Car ran great prior to turbo, turbo setup went on and its never been quite right..

    What it does:

    barely stepping on the gas pedal the car bogs, I can kill the car if I hold it just right.

    Drives decently but I can feel soft misses in the 3k rpm range

    No check engine light, it comes on prior to start up but then goes out, pull codes with ms41 quick flash, nothing..

    What I've done

    Compression test, hot test no fuel relay in numbers with 150 +-2 across all 6...

    replaced every sensor under the sun with either OEM or recommended by you guys in the forums

    All coils and plugs are new, I've tried several gaps with R5671a-7, .018, .022, .025

    Pressure tested the entire intake system, pressurized the system prior to the system and checked for leaks, none found.

    pressurized the exhaust system to check the manifold, none found.

    running a single o2 oem sensor 10"-15" from the turbo, where TRM recommended I place

    Wide band shows 14-15, running lean? WOT 13-14.5, had TRM retune it.

    Any point in the right direction would be amazing!!!

    I keep going back and forth between selling the car and not, I love it but it drives me crazy I cannot solve this issue...

  2. #2
    Join Date
    Feb 2011
    Location
    Virginia
    Posts
    2,948
    My Cars
    97' m52 turbo
    It's weird that out all of that I don't see anywhere where you have said you have checked the fuel system, pressure specifically.

    Could be a failing fuel pump or a problem with the pressure regulator whether it be stock or aftermarket.

  3. #3
    Join Date
    Jun 2005
    Location
    Concord, NH
    Posts
    24,534
    My Cars
    08 E90M3; 99 E36M3 Turbo
    Easy enough to determine. Then I would suspect the tune. I know some tunes require a resistor in the HFM signal wire and bridging of the 2 ground wires and that those things have caused issues for some.

  4. #4
    Join Date
    Apr 2022
    Location
    Duluth,Georgia, united st
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    6
    My Cars
    1998 328is turbo
    It has a new hellcat 525 fuel pump and new fuel pressure regulator along with a new oem filter. It did throw a code yesterday! I havenít pulled them yet but will later today and post the codes. So happy for a check engine light

    Quote Originally Posted by 328iFun View Post
    It's weird that out all of that I don't see anywhere where you have said you have checked the fuel system, pressure specifically.

    Could be a failing fuel pump or a problem with the pressure regulator whether it be stock or aftermarket.

  5. #5
    Join Date
    Feb 2011
    Location
    Virginia
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    97' m52 turbo
    New doesn't really mean anything, but good that they are

  6. #6
    Join Date
    Apr 2022
    Location
    Duluth,Georgia, united st
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    My Cars
    1998 328is turbo
    Quote Originally Posted by 328iFun View Post
    New doesn't really mean anything, but good that they are

    OH one thing I noticed is when I pressured the intake air was coming out of the MAF where the wire harness goes into it. I have a video. Ken at OTP or TRM said they swapped the sensor but it made no difference they said..

    I will test fuel pressure at idle and while barely hitting the gas, should I see a flux in the pressure?

  7. #7
    Join Date
    Apr 2022
    Location
    Duluth,Georgia, united st
    Posts
    6
    My Cars
    1998 328is turbo
    I suspect the tune as well but Michael said they built an almost identical car with e85 and had no such issues... same tune..

  8. #8
    Join Date
    Jun 2005
    Location
    Concord, NH
    Posts
    24,534
    My Cars
    08 E90M3; 99 E36M3 Turbo
    Fuel pressure goes up 1:1 with boost pressure. Off boost, it will be about 7 psi below base pressure under the vacuum of -20 inch at idle and decrease to 0 boost 0 vacuum as you give it throttle but not enough to spool the turbo to make boost. Base pressure on these cars is 51.5psi. So 44 psi at idle, 51-52 psi at 0 vacuum/boost and 51-52 psi plus boost pressure when in boost.

  9. #9
    Join Date
    Apr 2022
    Location
    Duluth,Georgia, united st
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    My Cars
    1998 328is turbo
    Quote Originally Posted by pbonsalb View Post
    Fuel pressure goes up 1:1 with boost pressure. Off boost, it will be about 7 psi below base pressure under the vacuum of -20 inch at idle and decrease to 0 boost 0 vacuum as you give it throttle but not enough to spool the turbo to make boost. Base pressure on these cars is 51.5psi. So 44 psi at idle, 51-52 psi at 0 vacuum/boost and 51-52 psi plus boost pressure when in boost.

    Thank you! Ill report back with numbers

  10. #10
    Join Date
    Apr 2022
    Location
    Duluth,Georgia, united st
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    1998 328is turbo
    Ok!

    Threw the code 227 mixture deviation bank 1...

  11. #11
    Join Date
    Oct 2005
    Location
    Canberra, Australia
    Posts
    327
    My Cars
    1993 BMW 325i Coupe
    Are you tuning it yourself or getting someone else to tune it? I'd personally just give it to a tuner who knows the ECU/software and get them to dyno tune it while working out the kinks.

    E36 1993 325i Coupe - Gt3582 turbo build COMPLETE!
    DomsE36Garage Youtube Channel
    DomsE36Garage Instagram

  12. #12
    Join Date
    Feb 2017
    Location
    Raleigh, NC
    Posts
    276
    My Cars
    1998 M3 643whp
    This has all the sounds of it running lean. Tune, bad fuel pump, injector, big vac leak.

    What does your wideband O2 gage say? Hint, hint.

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