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  1. #1
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    3 out of 3 members liked this post. Yes Reputation No

    JB4 single turbo boost control

    Most up to date directions and firmware posted here: http://www.n54tech.com/forums/showpo...17&postcount=1
    Last edited by Terry@BMS; 12-17-2013 at 03:35 PM.
    Burger Motorsports
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    omg. lol yay!
    This is epic. i kinda wanna go single now on the 1seires when i get it but i will wait on results on this. Click here to enlarge
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    Got one more tow with AAA lets make it count Click here to enlarge

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    finally we can use fftech single turbo with jb4 tune Click here to enlarge

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    awesome news!

    @Terry@BMS, on what did you test this Click here to enlarge??
    SOLD --'07 E90 335i, PTF COBB E50, HFS4, ER CP, ETS 7", AA DP, Vishnu Exhaust, DCI, ACT, Nitto Nt555

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  5. #5
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    eleventeen is helping test the software, dial in the PID, currently. Plenty of work to go. But excited it appears the factory solenoid, etc, will do the job. Click here to enlarge
    Burger Motorsports
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    That's awesome. I though by switching the ports like that you could effectively invert the control scheme of the DME. Less is now more.
    Eppur si muove.

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    nice!
    2008 e92 335i: JB4 G5 ISO/BMS back end flash, fbo, e85, inlets, Rb turbos, level 10 valve body + converter, water/methanol.....and a lot more....

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    Badass Terry!
    Change is constant

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    That's pretty freaking awesome
    Click here to enlarge
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    Click here to enlarge
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    Wouldn't there still be safeties in place to prevent the overboost from a vacuum leak from damaging the engine?
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    Good work!
    Click here to enlarge
    ESS 6XX kit

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    DME would limp and hit a 2D59 code (torque limit) in a flash only approach. I suspected this was possible but didn't have a chance to test it personally yet. This is great news.
    Click here to enlarge

  14. #14
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    Click here to enlarge Originally Posted by TCW Click here to enlarge
    Wouldn't there still be safeties in place to prevent the overboost from a vacuum leak from damaging the engine?
    As long as its properly tuned the throttle still still close if you go over target, and the timing pull be pulled back if properly setup in the timing table. But it's a much higher risk arrangement than the factory vacuum actuated wastegates so plan accordingly!
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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
    As long as its properly tuned the throttle still still close if you go over target, and the timing pull be pulled back if properly setup in the timing table. But it's a much higher risk arrangement than the factory vacuum actuated wastegates so plan accordingly!
    Can the DME close the throttle all the way and limp if the wastegates are stuck closed for example? Assuming stock turbos here.

    If so, there's no need for boost control safeties beyond the DME because the DME can always shut things down.

  16. #16
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    Yes, that's what it does actually..ask anyone who had an actuator get stuck closed at the road course...
    Click here to enlarge

  17. #17
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    Click here to enlarge Originally Posted by DallasBoosted Click here to enlarge
    Can the DME close the throttle all the way and limp if the wastegates are stuck closed for example? Assuming stock turbos here.

    If so, there's no need for boost control safeties beyond the DME because the DME can always shut things down.
    It will try. But it's slow and often flash tuners dampen it more than stock making even slower to respond. You can easily blow up a motor over boosting it even with the throttle safety in place. So, just take some caution when setting it up.
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    Is this in anticipation of also being able to fool the ECU into running off of 1 O2 sensor bank? Or does this assume a Shiv type arrangement of the sensors?

  19. #19
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    No work on o2 sensor front or fueling front has been done yet.
    Burger Motorsports
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  20. #20
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    1 out of 1 members liked this post. Yes Reputation No
    Great work. I'll have to give this a try sometime. For now I'm controlling boost with the right foot.
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    Click here to enlarge Originally Posted by Roy Cormier Click here to enlarge
    Great work. I'll have to give this a try sometime. For now I'm controlling boost with the right foot.
    Click here to enlarge

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    @Terry@BMS do you have a diagram of how the boost solenoid is originally set up from the factory.

  23. #23
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    Click here to enlarge Originally Posted by Roy Cormier Click here to enlarge
    Great work. I'll have to give this a try sometime. For now I'm controlling boost with the right foot.
    high five ! lol
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  24. #24
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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
    No work on o2 sensor front or fueling front has been done yet.
    Do you plan working on it?

  25. #25
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    I may at some point.
    Burger Motorsports
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