09-01-2016, 11:07 PM | #1 |
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B58 JB4 Shift Behavior
Just finished installing the JB4. Power feels good, although turbo lag is more prominent. I noticed when shifting on power you can feel a loss of boost. It feels like the turbo is trying to build up again. In stock form it feels seamless. Is this expected?
Note: Still waiting for Bluetooth kit to get some logging. |
09-02-2016, 07:34 AM | #3 | |
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Make sure your user adjustable settings are set to default. Ref this: http://www.n54tech.com/forums/showthread.php?t=18588
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09-02-2016, 09:35 AM | #4 | |
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Mike Last edited by Mike@N54Tuning.com; 09-02-2016 at 10:11 AM.. |
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09-02-2016, 10:13 AM | #5 |
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09-02-2016, 10:17 AM | #6 | |
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09-02-2016, 10:19 AM | #7 |
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There is more toque, it just doesn't come on as smooth. You put your foot down and it takes a second for it to spool up. Perhaps because of the increased psi it take longer to build.
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09-02-2016, 10:25 AM | #8 |
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Are you in Sport+ with DSC disabled? TC or DSC could be causing a drop in power to maintain traction. Something definitely isn't right if you feel like you are experiencing more lag. Also, what other mods do you have?
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09-02-2016, 12:36 PM | #9 | |
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However, shifting near redline in 1st and 2nd is really rough. The power and boost feels like it cuts out and it is quite jerky. I know logs would help, but the Bluetooth Connect Kit has been sitting at Extreme Power House for the last 5 day "awaiting pick-up". I emailed Mike, hopefully I'll have it soon. Edit: I have no other mods |
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09-02-2016, 11:35 PM | #10 |
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Same here, it's like a hiccup when wot, and the trans shifts, turn jb4 off and it shifts smooth again.
I love the power but not the shifting, so I have it turned off |
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09-03-2016, 12:01 AM | #11 |
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09-03-2016, 10:19 AM | #12 |
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I feel the exact same thing in Comfort mode. Enabling DSC (TRACTION button or Sport +) seems to cure this for me. I'm guessing it is the ECU dropping boost/ closing the throttle but I have not logged it. With DSC on the car also doesn't short shift which helps because this engine makes power all the way to recline.
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09-03-2016, 08:30 PM | #14 | |
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09-03-2016, 08:39 PM | #15 | ||
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09-05-2016, 12:50 PM | #16 |
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It's in beta for the B58, I wouldn't expect it to be perfect yet. Like others suggest do some logging and contact support. They are pretty smart cookies.
Last edited by zinner; 09-05-2016 at 01:01 PM.. |
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09-15-2016, 12:57 AM | #17 |
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Any updates? Mine does the same thing. It almost seems like at WOT near redline it stops for a second and it picks backup but you lose a lot of ground when that happens.
All I have is BMS intake and the jb4. |
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09-15-2016, 09:53 AM | #18 |
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Yeah that was a bit overoptimistic, it spoofs the IAT to lower timing but it's very crude and can't react fast as it would throw a fault. So basically JB4 tells your engine when it's on boost that IAT are roughly 140 so it pulls timing.
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09-15-2016, 11:07 AM | #19 |
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I will do some data logs. My theory is it might be the BMS intake causing an issue or 91 crappy fuel.
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01-30-2017, 08:45 AM | #20 |
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Any updates regarding this? Did the shifting behavior fix itself as you kept driving it? Or did the new firmware update fix the shifting behavior?
Edit-- Update fixed it
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Last edited by mikeleeyh; 01-30-2017 at 08:49 PM.. |
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02-01-2017, 11:45 PM | #21 |
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I have this same issue with and without the jb4. The higher boost/extra power just makes it more noticeable. Turning traction control off helps but it still feels like I'm being held back by electronics and turbo lag. I still love my car but this kind of stuff makes me miss how raw my mustang was.
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02-02-2017, 07:13 AM | #22 |
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Have you tried a throttle body adaption reset - that may help
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