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  1. #1
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    Cool Fun with a JB4 - High BOOOOOST action! :)

    Upped fuel pressure from 90 (default) to 100 which seems to have made the misfire go away top of 3rd gear. Got 2 misfires top of 4th gear (6300rpm) in total 20 runs so maybe now hooking up the BAP and upping the pressure on the LPFP side might push me through in 4th consistently to 7k rpm, we'll see

    After that COBB stage 1 video, here's some JB4 map3 action, about 18.5psi on my car LOL

    Click here to enlarge

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    I do not understand, I only see 16 psi and 13 psiconstant

  3. #3
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    You're looking at the fuel gauge? It's reconfigured to show meth flow, not boost
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  4. #4
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    that is pretty damn fast dude.
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  5. #5
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    awesome man! you're holding 18.5 to redline in the lower gears?
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    2007 335i Coupe
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    Click here to enlarge Originally Posted by oddjob2021 Click here to enlarge
    awesome man! you're holding 18.5 to redline in the lower gears?
    these runs spike to about 20psi, then quickly drop to about 18.5 and down to about 16.5-17 at redline...i'll post the logs a bit later
    Click here to enlarge

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    Here's some logs from last night...the one from the youtube vid is one of the two 2-3-4 pulls below:


    Click here to enlarge


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    Enjoy! Click here to enlarge


    Amazing what these turbos can do with pump 94 gas and just winter washer fluid which is 45-50% meth and the rest water but I consider it a 50/50 mix Click here to enlarge at the track I'll probably run 70/30 or 80/20...need that water in there!! Consider the above the ultimate street setup!! Click here to enlarge what fueling issues and limitations???? look at those AFRs Click here to enlarge
    Click here to enlarge

  8. #8
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    congrats...looks like you just needed a little juice
    JB4LIFE

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    Excellent work!
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  10. #10
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    this is on stock turbos???
    what other supporting mods??
    2009.5 AW E90 335i ZMP - SOLD
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    Want to Buy: 1977-89 Porsche 911 Turbo Coupe (930)

  11. #11
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    RB turbos + Every other perf mod lol

    On fairly heavy 19" wheels
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    Click here to enlarge Originally Posted by dzenno Click here to enlarge
    Upped fuel pressure from 90 (default) to 100 which seems to have made the misfire go away top of 3rd gear. Got 2 misfires top of 4th gear (6300rpm) in total 20 runs so maybe now hooking up the BAP and upping the pressure on the LPFP side might push me through in 4th consistently to 7k rpm, we'll see
    How far can the fuel pressure be upped?

  13. #13
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    Don't know..Jb4 has some weird scaling of the high pressure sensor..stock goes to "12" whatever that means...on default jb4 fuel pressure setting (90) it goes to 18...upped from 90 to 100 it still goes to 18 so I don't know really...
    Click here to enlarge

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    awesome
    Click here to enlarge

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    glad to see the misfire problem is almost gone.

  16. #16
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    Click here to enlarge Originally Posted by Sorena Click here to enlarge
    glad to see the misfire problem is almost gone.
    too bad that "almost" gone isn't consistent enough so I can figure out what exactly is causing and be able to either address it/fix it or get around it effectively...
    Click here to enlarge

  17. #17
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    have you ever thought about ignition coils? it might be the cause.

  18. #18
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    he has the upgraded coils from okada. i assume he upgraded to them because of the misfire issue.
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  19. #19
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    Click here to enlarge Originally Posted by oddjob2021 Click here to enlarge
    he has the upgraded coils from okada. i assume he upgraded to them because of the misfire issue.
    Correct

    I've tried many many things, here's a thread on the numerous things I've tried so far:

    http://www.bimmerboost.com/showthrea...isfire-mystery...
    Click here to enlarge

  20. #20
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    Try an S65 swap.

  21. #21
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Try an S65 swap.
    lol that'd have probably been much easier to do than going after this gremlin lol
    Click here to enlarge

  22. #22
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    Your 6mt?
    Click here to enlarge Originally Posted by Twinturbom3 Click here to enlarge
    Keep on jealousing.

  23. #23
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    1 out of 1 members liked this post. Reputation: Yes | No
    Of course
    Click here to enlarge

  24. #24
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    Click here to enlarge
    Click here to enlarge Originally Posted by Twinturbom3 Click here to enlarge
    Keep on jealousing.

  25. #25
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    that resistance takes that JB4 18 ohms or 15ohms??

    fuel may rise 15 110 ohms 19 psi would have to dowell








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