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MHD Stage 1 not hitting boost targets
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07-11-2022, 11:10 AM | #1 |
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MHD Stage 1 not hitting boost targets
Didn't want to hijack others threads, but could use some help/thoughts.
I have a N55 335i which is completely stock except for a VRSF charge pipe. Installed the Stage 1 maps (both 93 and then 91) and noticed I am hitting about 12psi low in the range and then quickly tapering back down to around 9-10psi. This is my first time looking through logs so I'm trying to decide what to look at next. I removed and reseated the charge pipe to look for any obvious leaks. I purchased a boost leak tester and will double-check for leaks later in the week, but am not sure if these logs indicate an issue with a leak or possibly a wastegate or something else. The WGDC numbers seem to be a lot lower than what I have seen on other folks logs, but I have read those numbers may be less important depending on the adjustment of the wastegate. There are no codes and didn't notice any stored. I inspected the turbos for any obvious signs of oil leaks or other issues but didn't see anything. Car has 76k on the odometer so not super high mileage. I do suspect the previous owner might have had a JB4 since the clips on the ECU cover are cracked off unless it was removed for something else. Here are 2 logs as well as one showing stage 0. Stage 0: https://datazap.me/u/cyberdemon/log-...og=2&data=3-11 Stage 1 - 91 octane 2-3 pull (Car had a fresh tank of Mobil 93) https://datazap.me/u/cyberdemon/log-...=1&data=3-4-11 Stage 1 - 91, 2nd gear only. https://datazap.me/u/cyberdemon/log-...=0&data=3-4-11 Any thoughts are appreciated!
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07-20-2022, 10:35 AM | #2 |
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Pretty significant timing corrections throughout the whole pull. 7deg on cyl6 at some places.
You do plugs/coils before flashing?
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2013 E92 335xi MSport
DOCVU+JB4|xHP Stage 3|VRSF DP|VRSF FMIC|AFe Stg2 CAI|Remus Race Exhaust|ER CP|GFB DV+| |
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07-20-2022, 09:43 PM | #3 | |
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Will install it all when the heat dies down and see how it goes.
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07-29-2022, 07:35 AM | #4 |
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Replaced the plugs and coils - looks like I got back between 2-3 PSI higher in the range but still a little below target. Weather has been super hot, will let the car adapt for a bit and see if it continues to improve.
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07-29-2022, 01:58 PM | #5 |
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Not very common, but do check how tight the injectors are sitting in their ports right now. If one can easily be wiggled out, you may have a blow-by leak there. That's what happened to me, not able to hit tuned boost targets and WOT also gives me a fit. I ended up having to re-sleeve a new port to make it tight again. I was lucky to see quite a few of these issues on N54 folks' boost leaks; then found the same on my car. Your data doesn't look that way, but just something to think about if all other possibilities have been explored to no avail.
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2015 X535i - CP Piston, Manley Rod, ACL/King bearings, MILVs VRSF full charge Pipe, Wagner FMIC, Hybrid Turbo, MHD2+ VRSF DP, UR Front/Rear Sway Bars, Eibach springs, Bilstein B6
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 |
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07-29-2022, 02:08 PM | #6 | |
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Car seemed to be running better with the new coils otherwise. Thinking about moving to the 93 map and seeing how close it gets to the higher target.
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07-29-2022, 02:21 PM | #7 | |
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2015 X535i - CP Piston, Manley Rod, ACL/King bearings, MILVs VRSF full charge Pipe, Wagner FMIC, Hybrid Turbo, MHD2+ VRSF DP, UR Front/Rear Sway Bars, Eibach springs, Bilstein B6
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 |
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07-29-2022, 03:47 PM | #8 | ||
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