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BMW 3-Series (E90 E92) Forum
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MHD "take a look at my log" thread
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01-04-2021, 02:18 PM | #4423 |
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01-04-2021, 02:20 PM | #4424 | |
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01-04-2021, 02:29 PM | #4425 | |
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01-04-2021, 06:08 PM | #4426 |
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Duty cycle looks a bit high, but if your wastegates rattling like crazy, I'd get uprated turbos fitted. Don't bother stripping turbo's and fitting uprated wastegates, waste of money. Just get those stage 2 turbos fitted, you will need a custom tune for it.
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01-04-2021, 10:53 PM | #4427 | |
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Drives: 07 E92 335i
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01-05-2021, 09:48 AM | #4428 | |
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I personally did a DIY Walbro 450 upgrade that I bought from summit racing, it was cheaper and much higher flow than just replacing with a standard OEM pump. |
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01-13-2021, 07:38 PM | #4429 |
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Hello guys,
Have a bmw 135i N55 engine, just flashed MHD stage 2+ and made some logs, can you help me with your feedback ? https://datazap.me/u/alexpereap/stag...4-5-9-10-21-39 https://datazap.me/u/alexpereap/stag...4-5-9-10-21-39 I see the current boost after 4000rpm starts to drop and it's far from hitting the target boost. Also I see wgdc% is quite high, I wonder if both behaviors are normal due to my high altitude, (Live in Bogota: 8016ft, 10.91 psi ambient pressure). The WOT was made with DSC fully off. Could it be a boost leak ? (don't think so as it hits 20psi at some point) Maybe worn boost solenoid ? Thanks in advance! Hardware on car - BMS air intake - Catless downpipe - Wagner Evo 1 FMIC - 6 Eldor new coil packs - 6 new ngk 2 step colder spark plugs Last edited by alexpereap; 01-13-2021 at 07:45 PM.. |
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01-13-2021, 09:33 PM | #4430 |
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Is the boost target too far off in this log?
I noticed the boost target is a bit off in this log; and seems to do that in another log too. Is 4psi alot of variance?
How does this log look also? https://datazap.me/u/terryeaton/log-...og=0&data=3-21
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2010 335XI, Carillo Steel rods, JE pistons, Closed Deck, Stage 4 race heads, 6mt, Pure Stage 2 High Flows, B58 Coils, VRSF|Vu Brothers (Ft Worth, TX)|JSRTuning,
https://youtube.com/channel/UC_kL3RvFSGv9QmTVt6787gg |
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01-14-2021, 08:22 AM | #4431 | |
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Probably a boost leak, check and replace vacumn lines, cannisters for cracks Also worth checking charge pipe connections and diverter valves, IC hoses etc. |
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01-16-2021, 05:29 PM | #4432 | |
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How would detonation show up in a log btw?
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2010 335XI, Carillo Steel rods, JE pistons, Closed Deck, Stage 4 race heads, 6mt, Pure Stage 2 High Flows, B58 Coils, VRSF|Vu Brothers (Ft Worth, TX)|JSRTuning,
https://youtube.com/channel/UC_kL3RvFSGv9QmTVt6787gg |
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01-16-2021, 06:21 PM | #4433 | |
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Much better, boost and target are close, just over 1 psi Yes it looks like its running a little rich, but it leans out higher up the rev range. Your HPFP is consistently over 3k, Have you asked your tuner to have a look? Last edited by Saif2018; 01-16-2021 at 06:32 PM.. |
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01-18-2021, 09:16 AM | #4434 |
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Yes we're in the final stages of tuning, for some reason the boost hits a peak of around 29 or so which is great, but then we're trying to figure out why after that it falls off around 5k by about 3psi until i let out of the gas; it seems like it should stay close to 29 the whole time, that's what the target is. I had it checked for vaccum leaks recently they said it look good and the lines were updated not long ago and strong.
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2010 335XI, Carillo Steel rods, JE pistons, Closed Deck, Stage 4 race heads, 6mt, Pure Stage 2 High Flows, B58 Coils, VRSF|Vu Brothers (Ft Worth, TX)|JSRTuning,
https://youtube.com/channel/UC_kL3RvFSGv9QmTVt6787gg |
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01-18-2021, 11:11 AM | #4435 |
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Drives: 09 E92 335i 6MT
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Well, i've just about had it with N54T. I know they're not very friendly to non JB4 users but wow I often just get ignored. I am just about at my wits end with this issue. I have been chasing cold start misfires pretty much since August.
For starters, all injectors are now index 12, less than 10k on them, bank 1 less than 5k. NGK 97968s gapped at .022, new delphi coils, new valve cover + gasket, and I recently did a valve cleaning. I will admit, I was not able to get them spotless as my compressor is weak but they are significantly cleaner. I will be making another pass with a better compressor hopefully when it warms up. I have also reset adaptations twice now. I have also replaced every vacuum line I could find other than what goes to the wastegates. Unfortunately in this log I did not log WGDC but in all other logs they look fine. I am fairly certain this issue is presenting itself (when warm, as the misfires only happen when cold) in the form of my AFRs and fuel trims, which lead me to believe it's a vacuum leak, however that would show itself as a boost leak, would it not? I hit boost target, if not a little above. I have two logs which i'll attach below, one is a 3rd gear pull into 4th with some decel, the other is idle directly after a cold start (rail pressure still high from cold start). Logs here: 3rd gear pull: https://datazap.me/u/e92dave/3rd-gea...&data=3-23 idle: https://datazap.me/u/e92dave/high-st...&data=3-23 3rd gear pull was taken last night, i'm not worried about the timing corrections during the pull but you can see after the shift I get absolutely reamed by them. This was not happening until saturday when I pulled the plugs after sitting overnight, just to confirm no leaky injectors. Gaps were still good and I torqued them to the spec of 17lb-ft. Idle was taken this morning. Car is bone stock, not even a tune. I refuse to move on to tuning until i'm satisfied with this. Based on what i've seen in those logs, i'm somewhat leaning to 02s, as you can see what happens during shift/decel when the afrs should lean out. Does anyone else agree with this? I am still relatively new to data logging/troubleshooting issues like this. I really want to begin modding this car haha. Edit: I forgot to mention, I'm very concerned with the stfts. I know they're not exactly cause for concern in the pull, since they're not maxed out and appear to be working but during the idle log I would consider that very high for idle. I have also wondered, could an issue/air leak in my pcv system show itself this way? Since I don't have any real issue with boost, i'm wondering if it's related to the actual PCV valve (which I have a new VTT valve), since from what I understand that valve is closed during boost, which would show itself more during idle. Just an idea. I appreciate any feedback. Update: did some forum searching, after driving home today and immediately after shutting the car off I pulled the hose from the brake booster from the hose to the vacuum pump, I heard nothing. This would indicate a vacuum leak, right? I guess it's time for a smoke test.
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09 E92 335i 6MT / Alpine White / Coral Red / VRSF 7.5" / VRSF DCI / VRSF Catless Downpipes / VTT Charge Pipe / Turbosmart RacePort Gen V / RB OEM Billet Turbos / CD919 Custom Tune / Bilstein PSS9s
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01-19-2021, 08:03 AM | #4436 |
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Hey! Do you think there is any room for improvement?
https://datazap.me/u/in54nee92/log-1...solo=7-9-21-29 2008 335i fbo inlets/outlets stock rebuilded turbo (modified compressor and tubine wheel) custom tune shell 100RON bucketless walbro 450 xhp stage 3 2step colder spark plugs NGK 3.5 tmap |
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01-19-2021, 04:53 PM | #4437 | |
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Your WGDC is healthy/(low which is a good thing) and your pushing about 20 psi on pump gas. |
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01-20-2021, 04:15 AM | #4438 |
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Hi everyone. Here is my first OTS E30 log, tell me what you think.
https://datazap.me/u/evanp246/mhd-e3...0-11&zoom=3-72 My Car is a 2012 DCT N55 e92 (UK Market) I have full bolt ons: CSF intercooler VRSF catless downpipe VRSF Charge pipe BMS Intake Our pump fuel here in Barbados is about the same as ACN91 and I am using Fuse Racing Fuel E85. My mix is about a 3/4 tank of pump with the rest topped off with E. Car feels strong, observed slight wheel spin in the damp in 4th during the pull. Here is a pic of the car: Last edited by EvanP246; 01-20-2021 at 04:21 AM.. |
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01-20-2021, 05:30 AM | #4439 | |
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Your off boost target by about 4psi up top, You need to log LPFP (fuel low pressure sensor) as well. |
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01-20-2021, 06:20 AM | #4440 | |
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How do I get my lpfp to log? I do not see a provision for it? This is an N55. |
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01-20-2021, 06:54 AM | #4441 | |
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N55, ok that explains why you couldn't log it. Not sure how it can be read to be honest. Your HPFP seems good, so I would assume (going on a guess here) your LPFP should be ok, as I would expect a failing LPFP to drag HPFP down too. It is likely you have a boost leak, I would check and replace vacumn lines, check bov/diverter valve connections, charge pipe, IC connectiona to rule them out first, then boost solenoids, would also get the wastegate actuator rod checked, could be leaking boost as well. |
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01-21-2021, 08:52 AM | #4442 |
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I flashed v8 Stage 1+ map tonight and went out to do some data logs. Cruising to the highway felt fine (30-40mph). I get on the highway, shift into 3rd, and start my log. I floor it and get some wheel hop and I feel the car struggling to maintain traction but I continue accelerating and shift to 4th at 6K rpm and immediately after I notice my car is stuttering/shaking under any acceleration! I was scared I wasn't gonna make it home. SES light came on. The more gas I give, the more it shakes. I even feel the gas pedal vibrating.
https://datazap.me/u/junkyarddogg/lo...og=0&data=3-20 |
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01-21-2021, 09:50 AM | #4443 | |
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Next time, if it does that, try to stop on the side if possible, stop engine, remove key, and restart engine
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01-21-2021, 01:02 PM | #4444 | |
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