08-10-2022, 01:11 AM | #1 |
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N55 with b58 hpfp and MHD missfire failure
Hello, so after hard pull (launch control) on warm day (25'C) car started choking between 2/3 gear, then it was working like a tractor.
I've read the codes here is the 1st result : View post on imgur.com and here is the log this pull : https://datazap.me/u/socialpatrickk/...og=0&data=3-17 after this i've cleared the codes and run engine again : View post on imgur.com I was trying to get some info what can i do to do some more diagnostic from my site. So i flashed to stock map via mhd at the morning, then read the codes again, here is the errors codes : View post on imgur.com So finally i decided to load the custom map from tuner and after that there was no issues, no error codes, i did the test run with few pulls but without lunch control and the car was seems fine but if someone experienced could looks for the logs and error codes, should i check any engine parts ? here is the mods of car 435xi - intercooler moded - chargepipe moded - whole exhaust with sport cat - tmap sensor 3.5 - upgraded hpff (b58) - coils - Main Bearings crankshaft sport - hybrid turbo - xhp stage 3 - timing chain new |
08-10-2022, 06:47 AM | #2 |
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On my phone and just woke up. But without looking at that log I bet you had a fuel pressure drop.
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08-10-2022, 08:04 AM | #3 |
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Nope, it looks fine from the log. Looks like something else - MAF or sensor issue. Hopefully OP isn't using the stock airbox. OP are you tuned for the 3.5 Tmap?
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08-10-2022, 09:36 AM | #4 | |
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08-10-2022, 10:15 AM | #5 | |
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i'm going to order custom setup right now |
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08-10-2022, 10:35 AM | #6 |
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Yeah, inlet and intake are a must
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08-10-2022, 11:01 AM | #7 |
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I have very similar symptoms, subscribed to see what you may find on yours.
Mine does the same thing, it pulls hard throughout the rpms, but upon boost level around 13psi or beyond, it has a slight fish-bite jerk and power is immediately slacked. Watched fuel rail pressure as this was going down, it stayed at 2900psi and maybe only dropped lowest to 2500psi, I wouldn't call that a bad drop. Mine also ends up with multiple misfires with cylinder 6's fuel being cut. I've checked my charged joints 3-times already (each time I remove the whole front end just so I can really get a full reach to the whole charged pipe assembly.) I'm on MHD stage 1 right now and it's tolerable enough; but once I put it on stage 2 or plus, it'll start missing and cut down to limp mode after 13psi boost. I've just bought a boost leak tester, will perform the test this weekend. Smoke test won't reveal anything since it only runs at 1-2psi. I'm pretty much FBO with MHD's superpack. Don't know how to log yet, but if I can't locate the boost leak this week, I'll also be posting a log out here for you folks to also look at. BTW, on this issue, so far, just out of safety, I've replaced: new throttle body, new gas recirc vent valve, new vacuum line, new ccv heater hose, 3.5bar MAP, MAF, 1-step colder spark plugs, ignition coils, re-pattern all injector spray, cylinder 6's injector port is re-sleeved. One suspicion I have is, if the crankcase ventilation gets bad in the valvecover, could that be a point affecting my max boost? I did read in the N55 Engine PDF that the valvecover has its built-in crankcase ventilation system to manage engine block pressure and blow-by. There are a bunch of non-return valves and a pressure regulator valve built-in. Does anyone know if any of these go bad, can they affect whether or how well we can reach max boost? I'm asking this because prior to seeing the repeated cylinder 6 misfire and fuel cut off, the car was running just fine; able to reach 15-16 psi boost on MHD stage 2, don't know why it didn't make it to 18psi, but while it was running fine without any misfire at 15-16psi, I was all over town zig-zagging through traffic with it. Then few weeks into this, one of times I really needed the pep, I floored the pedal hard and while the car was accelerating and passing the vehicle in front of me, a fish-bite jerk occurred, then lost power, then limp mode, with bunch of warning lights on the dash. You all know how that goes. I used carly to reset the vehicle, then use MHD to flash back to stock tune, and car's been driving just fine. But since then, every time I put it on MHD stage 2 or more, it'll cut out at 13-14 psi or so. Gonna try to officially run a boost leak test by inputting an increasing pressure at the turbo inlet and see if I get the infamous boost leak.
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2015 MINI COOPER - Mahle Pistons, Max Rods, BMS intake, CTS charge pipe, Wagner Intercooler, ByteTronik Tune, VRSF DP 2017 540i - MHD2+, VRSF DP, TU Pump Last edited by yupetc; 08-10-2022 at 11:15 AM.. |
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08-10-2022, 11:52 AM | #8 |
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multiple misfires put you into limp mode by disabling some of the injectors, that's why it was like a tractor. the misfire was due to your hpfp not being able to keep up.
it's in the log at gear 2, 6200 rpm, your hpfp drops to 1600psi with a request of 2500psi.
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08-10-2022, 11:55 AM | #9 |
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also, i don't know what everyone else is seeing about his stock intake being an issue.
those boost pressure codes likely because he is on 3.5 bar TMAP and running stock tune (which expects the stock 2.5bar TMAP)
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08-10-2022, 12:05 PM | #10 |
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also, which b58 hpfp do you have? the gen1 is barely any more fuel volume than stock. so it's very likely to be running out of fuel with a hybrid turbo at 18 psi. the b58tu is the pump that everyone talks about and has a noticable increase in fuel volme.
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08-10-2022, 12:38 PM | #11 | |
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I also don't know why everyone is talking about an intake. An inlet will be beneficial for sure, but people make 500whp no problem on stock intake. Swapping the intake is NOT going to solve the problem in OP. |
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08-10-2022, 12:39 PM | #12 | |
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08-10-2022, 12:44 PM | #13 | ||
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Also we don't know if its the B58 or TU pump - or what mix he's running.
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08-10-2022, 01:35 PM | #14 | |
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Let's route back, though it seems like my issue is taking over the OP's, I believe we may have the same or similar issues. And it seems like I've tested everything except for a high boost (20-30psi) pressure leak test through the turbo inlet, or maybe if a leaky diagram in the crankcase CCV could be causing a boost leak at beyond 13-14psi range.
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08-10-2022, 02:46 PM | #15 | |
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08-10-2022, 08:14 PM | #16 | |
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08-10-2022, 08:24 PM | #17 | |
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Did you compression/leakdown test cyl 6? |
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08-10-2022, 09:23 PM | #18 |
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Wait so.. there was a pressure drop like I said there would be?
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08-10-2022, 11:25 PM | #19 |
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08-11-2022, 02:32 AM | #20 | |
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edit : the pull after the car started chocking was on the same map, so the chronology was custom map with custom settings via mhd pull -> issue with tractor -> clear codes -> back to stock map -> few issues from codes above on stock -> custom map with custom settings -> no issues with codes i didnt pulled yet car after this but im pretty sure it might be the same result, i will test very soon. Last edited by Siowroc; 08-11-2022 at 03:47 AM.. |
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08-11-2022, 02:29 PM | #21 | |
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I must maintain that it was running find with boost before, but something happened during one very demanding drive and now it won't drive correctly past 13-14psi. I still believe boost leak is likely since I have Wagner FMIC, FTP TIC and VRSF CP. I really believe there has to be a bad joint somewhere and ever since that bad event, it's never the same again.
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08-11-2022, 02:32 PM | #22 | |
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Wont build boost past 13-14 psi --> boost leak could be the reason builds boost past 13-14 psi but doesnt run right when it does --> much less likely boost leak is the reason |
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