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Help Needed: MHD Log
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07-10-2021, 06:17 PM | #1 |
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Help Needed: MHD Log
Thanks in advance for any valuable inputs!!
Been running MHD stage one since I got my 2010 E89 Z4 last year. Here is the problems I encountered and potential solutions I have found on the internet. - Currently 75k km and using 1+ ACN91 map with CAD94 fuel (yes, Canada has very crappy fuel so I am being conservative) - Had misfire issue on cylinder 4, decided swap all spark plugs with NGK ones (gapped .022) and coils replaced with Delphi ones. - Have been having timing issues accross all cylinders under WOT, issue persisted after swapping new sparks and coils. Tried adding octane booster but no luck (been using Canada's chevron 94) - Another weird issue is the throttle position goes low as 30 when under WOT. - Occasionally encounter over boost issue with following codes: 30FE Turbocharger, charge-air pressure too high. And 3100: Boost pressure control, deactivation. Seemed to fix the problem when Im running 1+ ACN91 map https://datazap.me/u/xxq00958/log-16...7-8-9-10-21-24 https://datazap.me/u/xxq00958/log-16...og=0&data=3-21 https://datazap.me/u/xxq00958/log-16...og=0&data=3-21 Any input is greatly appreciated!!! |
07-10-2021, 07:23 PM | #2 | |
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Are you using oem intercooler or aftermarket? Stock dv or aftermarket? In your log the low pressure fuel pump shows zero. See if you can log that next time.
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07-10-2021, 10:23 PM | #3 |
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Walnut Blast is on the list. Still looking for a reputable shop in Vancouver.
I think the previous owner upgraded it. Its definite a lot bigger than stocks 5" fmic. And I don't notice any heat soak problem after multiple pulls. It is to my understanding that e89 does not have aLPFP. |
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07-11-2021, 06:18 AM | #4 | |
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Log shows 93oct map, are you actually using 93oct fuel or acn91? Last edited by Saif2018; 07-11-2021 at 07:19 AM.. |
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07-11-2021, 09:55 AM | #5 |
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I agree the IAT climb high fast. This is most likely the cause of the timing corrections. Walnut blast will help also.
Your current fmic may be dented up or just a crappy one. For what it's worth I run the 93 map in Canada with 94 petrocan/chevron or husky. See if ARM makes a intercooler for your car. They are pretty good for the price as well.
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07-11-2021, 01:31 PM | #6 | |
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07-11-2021, 01:34 PM | #7 | |
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07-11-2021, 01:34 PM | #8 | |
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First and second logs show IAT's reaching 70+ degrees C, plus loads of minor timing corrections probably due to the poor fuel quality. Timing corrections can also be due to your plugs and coils, it they haven't been changed recently. |
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07-11-2021, 07:01 PM | #9 | |
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Sparks and coils were changed before these logs. Can anyone comment on the over boost on the log? |
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07-12-2021, 12:06 AM | #10 | |
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Could also be your boost solenoids causing the issue. |
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07-12-2021, 08:35 PM | #11 | |
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Flashed 7.1 today. Car definitely feels more responsive under WOT. I am pretty sure throttle closure isn't as bad on 7.1...Wondering why.. Boost solenoids are on their way. Will report back if that does indeed fix my over boost issue. Log will also be provided! Thanks for everyone's help! |
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07-12-2021, 08:56 PM | #12 | ||
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9 is great too but is more Linear compared to 7.1. Even if v9 technically makes slightly more power, the butt dyno likes 7 better lol. Also a great idea to replace all vacuum lines when installing boost Solenoids (if you haven't replaced them already).
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07-12-2021, 10:49 PM | #13 |
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So.... Did another log and the throttle closure problem came back and I could feel it too. Feels like loss of power while WOT and after a few seconds you feel a surge of torque.
https://datazap.me/u/xxq00958/log-16...-9-10-13-21-24 Help :< |
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07-12-2021, 11:10 PM | #14 | |
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07-13-2021, 12:16 AM | #15 | |
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Worst case, your wastegates stuck closed as Dave said, or not closing and opening properly. |
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07-13-2021, 12:21 AM | #16 | |
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I was told it was a Turbo out, wastegates rebuild job at yhe very least or turbos had to be replaced? |
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07-13-2021, 12:22 AM | #17 | ||
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07-13-2021, 09:11 AM | #19 |
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I have heard of the waste gates arms getting caught on the v band clamps if they are not positioned correctly. This would be good to Check.
Maybe you boost solenoids are toast and not operating the waste gates properly too. They can act pretty goofy and inconsistent when they crap out.
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07-16-2021, 03:50 PM | #20 |
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Update:
I have just replaced both boost solenoids. Overboost problem seemed to be gone now!! As well as the noise coming from (perhaps wastegate?) when under light acceleration and light decel, is also gone now!! I will provide more logs once my FMIC is installed to see if the timing issue still persists. Thanks for everyone's help!! |
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07-17-2021, 12:06 PM | #21 | |
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Once you have your intercooler installed, you could also try a map that's not Acn. I live in Alberta and I have good luck with the 94 husky gas and the MHD 93 oct maps.
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