01-23-2021, 08:27 PM | #1 |
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I read another forum x5 driver that had a GTS racechip that the ECU learned and didn't pull on repeatedly runs. apparently he strapped it to a dyno and ran it 3 times and after each time the HP&TRQ dropped hard.
Does anyone notice this on the m850i or m8 with a piggyback? does the stock bmw ecu "learn and adjust" ? or did they just not know how to dyno awd? |
01-24-2021, 11:03 AM | #2 |
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I have never had this issue with my RC on the F90 (over 2 years) or now the M8.
I have no doubt limey is clean of issues too with his over extensive use of piggy tunes limeypride
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01-24-2021, 11:26 AM | #3 | |
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I've used JB4s for over 10 years on some 12 or 13 cars and I've never experienced anything like that. In fact, while the JB4 is more customizable—more advanced in many respects—at a fundamental level, they work in the same way so I fail to see how the proposed root cause could happen to one piggy and not the other. My guess is there's something else going on there. |
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01-24-2021, 11:32 AM | #4 |
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Not to highjack the thread but would you gents install the RC before break in service?
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01-24-2021, 11:46 AM | #5 | |
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Installs are the same. JB4 nets faster acceleration and offers customization... or not if so preferred. App looks as below and each tile can be customized. However, since it ships defaulted to map 1, you don't need the app. Most, however, enjoy using the simple pieces of the app—map switching being the most obvious. If you ever hand your car to a valet, set the valet map (8) which effectively disables boost reducing engine power dramatically. |
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01-24-2021, 12:37 PM | #6 | |
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I done over 100 ecu tunes (variations on many cars) and have always tuned rather quickly- 100 to 200 miles in. Its what "I" do and Im not say it's what everyone should do. I have not had one single engine issue related to the tune(s) on any of these cars. I have had warranty work but thats for other items.
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01-24-2021, 01:23 PM | #7 | |
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My m850i has 3k miles, but homes there isn't much different from 1k to 3k on the base cars. The "m" cars have different setups. |
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01-25-2021, 09:46 PM | #8 |
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Hmm.
I've dyno'ed my 2020 X3MC 4 different sessions and about 6-8 pulls each time, number is consistent. I also did dyno on 2020 X5MC 2 sessions about 6-8 pulls per session, numbers are consistent.
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01-27-2021, 09:19 AM | #9 | |
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thanks! https://f15.bimmerpost.com/forums/sh....php?t=1629850 |
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02-14-2021, 07:51 AM | #10 |
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Running a Racechip on my M850i with no such issues. It works well.
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02-14-2021, 08:36 AM | #12 | |
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Install is identical if you only use the JB4's Racechip-equivalent functionality. However, the JB4 can also take direct control of the wastegates and will use OBD II telemetry in real-time to optimize performance. |
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02-14-2021, 09:10 AM | #13 | ||||
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remove and plug-in thing the Race-chip comes with when you bring it in for service is a big selling point. I can install neither myself anyway. |
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02-14-2021, 09:42 AM | #14 | |||||
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The bypass doesn't remove the piggyback harness cabling. Frankly, if you're worried about making and having BMW reject a warranty claim because of the tune, you should be. But removing these devices even completely doesn't prevent them from retroactively being detected so I'd argue any bypass attempt—HW, SW or otherwise—to hide the tune is futile. BMW record performance metrics as well as ECU/TCU engine/transmission telemetry and persist it across the vehicle's entire lifetime. You can't hide these things anymore. If BMW want to know, they can indeed know with or without the device or flash still in place. As we love to say on these forums, you pay to play... and this closing discussion here is the price. |
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02-14-2021, 10:33 AM | #15 |
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I just ordered the Racechip on my M8 for simplicity. -5 degrees in Chicago now so I'm gonna wait a bit to install!
I had the JB4 on my Audi and had nothing but problems with firmware, settings, CELs, and had to manually put it on l. Power gains were minimal and I had to use a blend of e85 to see any real difference. Seems like I was and am in the minority though. |
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02-14-2021, 11:14 AM | #16 | |
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That said, the Racechip provides good power gains so win win. |
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02-14-2021, 11:51 AM | #17 | ||||||||||||
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02-14-2021, 11:58 AM | #18 | |||||||||||||
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Burger offers no warranty (I'm not convinced Racechip do either but you never know). |
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02-14-2021, 01:32 PM | #19 | ||||||||||||||||||||||||||||
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02-14-2021, 01:49 PM | #20 |
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02-14-2021, 04:35 PM | #21 | |
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PS: if you're talking about the JB4 app, then you're miles away from reality. It lets you tweak things to your heart's content, e.g. individual boost targets per 500-RPM increment or subtract from the boost target but only in 1st and|or 2nd and|or 3rd or use valet mode which effectively turns the V8 into something naturally aspirated... the list goes on. To switch maps, simply double tap: Last edited by limeypride; 02-14-2021 at 04:43 PM.. |
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