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  1. Replies
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    The DME has a timer for when to cut fuel when the...

    The DME has a timer for when to cut fuel when the clutch is pressed, which is defined in the max time clutch switch observation fast fuel cut-off value. To prevent type4 shift bog you set that to...
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    OK thanks. Would be nice for the JB4 to monitor...

    OK thanks. Would be nice for the JB4 to monitor it in the background at all times and then alert the driver if/when the issue comes up.
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    Good data. Finally got the 135i back up and...

    Good data. Finally got the 135i back up and running after the AT->MT swap. Need to hit the scales to see what was saved. Hoping at least 40# as I went with a light weight alum flywheel. Should be...
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    Next firmware I'll change the AFR to go up to...

    Next firmware I'll change the AFR to go up to 255:1 or whatever the leanest possible reading is just for the hell of it but what we really need are logs from cars with known injector issues so we can...
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    We had a leaky injector discussion on that on...

    We had a leaky injector discussion on that on n54tech and the consensus was the AFR 237 on decel thing was a red herring. People had it with perfectly fine injectors. You may want to search for that...
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    Maybe, not seen logs from a leaky PI injector, so...

    Maybe, not seen logs from a leaky PI injector, so I'm not sure what the pattern would be. If you guys have some logs to share with a known leaky injector I can program the pattern recognition in to...
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    Just as an FYI for JB4 customers: Working on...

    Just as an FYI for JB4 customers:

    Working on updating the single turbo firmware with some additional safety systems.

    The first addition is a fuel trim safety system (safety mode = 5). It ...
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    OK, I'll check it out.

    OK, I'll check it out.
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    I need to come up with some test to determine...

    I need to come up with some test to determine that. I could see it both ways. For example for emissions concerns you may want any extra fuel that happens to be in the cylinder to be ignited.
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    FF has to learn up still on map2. You can set it...

    FF has to learn up still on map2. You can set it to say 80 and then do some addl longer WOT runs until boost is on target.
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    I also have direct injection meth on our S55......

    I also have direct injection meth on our S55... Fuel-IT is working on a system too. I don't think it changes much though as during a misfire the throttle remains open and other cylinders operating...
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    Once the AFR registers as 20:1 in the bank the...

    Once the AFR registers as 20:1 in the bank the JB4 cuts off meth flow also but that takes around 1500ms. Same as current PI implementation.
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    From the PI discussion on n54tech: It's...

    From the PI discussion on n54tech:



    It's certainly possible but I can't really tell that from the information provided. It's just as likely the piston just detonated apart causing the misfire. ...
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    I've become a tuner pro fan. Like the simplicity...

    I've become a tuner pro fan. Like the simplicity of it.
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    :facepalm It does not matter whether you have...

    :facepalm

    It does not matter whether you have selected 4/2 or 4/3 with the single turbo firmware.
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    Does not apply to single turbo firmware.

    Does not apply to single turbo firmware.
  17. Thread: 807 whp 135i

    by Terry@BMS
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    That car is making some power. If it ever gets...

    That car is making some power. If it ever gets AD's 4L80E going watch out. I ran 140mph with "only" 650whp in our 135i development car.
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    The main difference there is the headache with...

    The main difference there is the headache with setup (of the AIC6) and also the JB4's feedback. The AIC6 does not spit feedback to the JB4 on injector current like the JB4 controller does. So that...
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    Something like that could work. I think for...

    Something like that could work.

    I think for the JB4 in particular if you could shove a signal in some part of RAM and give me the address, I could monitor that address, and do the same thing with...
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    4/2 and 4/3 are not used on single turbo...

    4/2 and 4/3 are not used on single turbo firmware.

    Only setting problems I see in the CSV is the 3rd gear boost limiter and 6cyl timing logging.
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    We cut PI flow the moment you press the clutch in.

    We cut PI flow the moment you press the clutch in.
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    On the misfire in particular I think we can get...

    On the misfire in particular I think we can get within 200ms of an event. Which would be better than the 1500ms it probably takes now by the time the AFR leans out enough for the JB4 to pick that up...
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    I've spent a lot of time with port injection...

    I've spent a lot of time with port injection development over the last few months. And it's largely a safe system with few reported problems, but there are certainly improvements to be made. Someone...
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    Looks like an 11# WG spring? You have 3rd gear...

    Looks like an 11# WG spring?

    You have 3rd gear boost set to 2psi. change that to 0. You also need to turn on 6cyl logging on the user adjustment page. Then give map2 a whirl.
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    Right, or the one going to #8...

    Right, or the one going to #8 . Both are switched 12v sources and either works.
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