05-12-2021, 01:52 PM | #1 |
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okay need some eyes on my logs please
what in the hell is happening here..
back to back logs.. second one obviously the car breaks up and it's caused by a fuel pressure drop.. hpfp is dorch stage 2 and this problem exists with full e85 on a custom tune with both a stock lpfp and with a stage 2.5 lpfp. these runs are both with the aftermarket lpfp. nobody seems to have any idea. this was fuel pressure what clean... https://www.bootmod3.net/log?id=609c...0b434b387174ff this one, fuel pressure goes nuts... https://www.bootmod3.net/log?id=609c...729b2547ade408
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2017 m240i xDrive 10.99@122.86mph bootmod3 stage 2+ ots
2015 335i xDrive 10.95@124.99mph w/bm3 - SOLD 2015 X3 x35i pwg 12.96 catless w/bm3 stage 2 93 ots IG: @n55david For pics and updates! Youtube: @ n55david For videos or Racing etc |
05-12-2021, 02:05 PM | #2 | |
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Your fuel trims are also consistently positive to either the map needs more fuel added or you are misfiring enough that there is unburned O2 in the exhaust making it read leaner than it actually is. They are almost the same in the clean run too though so i would say maybe the former. |
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05-12-2021, 02:20 PM | #3 | ||
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2017 m240i xDrive 10.99@122.86mph bootmod3 stage 2+ ots
2015 335i xDrive 10.95@124.99mph w/bm3 - SOLD 2015 X3 x35i pwg 12.96 catless w/bm3 stage 2 93 ots IG: @n55david For pics and updates! Youtube: @ n55david For videos or Racing etc |
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05-12-2021, 03:18 PM | #4 |
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lower afr target won't help the stft. positive stft is the result of the car not getting to the target AFR with the fuel/injector scaling, so it has to step in and correct it so you reach your AFR target.
i see a spike of overboost at 5431 rpm, which throttle closes to correct, and it coincides with your rpm rise getting rough. at this time, the hpfp does take a dip too, but i don't understand why. i am also investigating a problem i have with misfires after quick gear shifts (6mt). in my case, hpfp also takes a dip and car 'breaks up'
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05-12-2021, 03:31 PM | #5 | |
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The HPFP dips immediately after the shift even before the boost spike. I don't have a obvious explanation either since its fine in the other log and on other shifts. The only difference is that this is a 2-3 shift, so im wondering if it happens only on the lower gear shifts when there is a bigger RPM drop between gears. The RPM rise gets rough because of the throttle and boost modulation and all the timing being pulled. |
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05-14-2021, 02:39 PM | #6 | ||
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https://www.bootmod3.net/log?id=609e...729b0442ad9494
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2017 m240i xDrive 10.99@122.86mph bootmod3 stage 2+ ots
2015 335i xDrive 10.95@124.99mph w/bm3 - SOLD 2015 X3 x35i pwg 12.96 catless w/bm3 stage 2 93 ots IG: @n55david For pics and updates! Youtube: @ n55david For videos or Racing etc |
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05-14-2021, 02:48 PM | #7 | |
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You're actually a decent amount below target in 3rd and 4th and i thought i saw stage 2+ OTS BM3 maps holding closer to 20psi than you are in with stock turbo. Could be because you are doing 3-4-5 rather than 4th gear pull though and you are revving out 6500+. |
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05-14-2021, 02:50 PM | #8 | |
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what turbo are you on? you're pretty off target boost
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05-14-2021, 02:52 PM | #9 |
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if anyone in here is 6mt, i'd love to see your multi gear logs!
we've all been conditioned to do single gear pulls, and have been blind to gear change issues! i want to rule out my hardware, so if multiple people are misfiring at gear change, i think its a tuning issue.
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05-14-2021, 02:57 PM | #10 |
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05-14-2021, 02:58 PM | #11 | |
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05-14-2021, 05:44 PM | #12 | ||
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not sure I can just do a single 5th gear log really.. very difficult to find the room and no traffic.
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2017 m240i xDrive 10.99@122.86mph bootmod3 stage 2+ ots
2015 335i xDrive 10.95@124.99mph w/bm3 - SOLD 2015 X3 x35i pwg 12.96 catless w/bm3 stage 2 93 ots IG: @n55david For pics and updates! Youtube: @ n55david For videos or Racing etc |
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05-14-2021, 05:46 PM | #13 | ||
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2017 m240i xDrive 10.99@122.86mph bootmod3 stage 2+ ots
2015 335i xDrive 10.95@124.99mph w/bm3 - SOLD 2015 X3 x35i pwg 12.96 catless w/bm3 stage 2 93 ots IG: @n55david For pics and updates! Youtube: @ n55david For videos or Racing etc |
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