05-03-2024, 01:56 AM | #1 |
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N55 PWG VTT Stage 1 Not Hitting Boost Target?
I've had this issue for a while now, but I've exhausted all of my options and am genuinely confused.
Things I've tacked: Adjusted wastegate arm smoke tested/pressure tested to 25 psi no codes mods afe intake bms inlet wanger tuning evo 3 fmic vrsf chargepipe vrsf downpipe vtt stage 1 turbo m2 diverter valve on bm3 ots 2H 93 Map Two 4th Gear Logs: https://datazap.me/u/tochez/log-1714718776?log=0&data=6 https://datazap.me/u/tochez/log-1714718785?log=0&data=6 From the logs, I can see my wdgc is not high. my hpfp and lpfp are good afr is good I am hitting some weird ignition issues (either fuel or need to reset adaptions due to adjusting wastegate) Im not sure why but boost hits, goes down, comes back up, and then its a steady decline down. At this point I feel like its a tune issue, but if anyone can chime in, that would be great.
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05-06-2024, 06:20 PM | #3 |
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Not an expert tuning the BMW platform, but APR's look really rich for direct injection. Are you running methanol with this setup?
On straight gasoline, the B58 runs close to stoic (14.7:1) (yeh, sounds scary lean) vs the typical 12-12.5:1 for power like you are seeing. Dropping aside, eating popcorn until those that spend more time tuning this platform chime in. |
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05-06-2024, 10:54 PM | #4 | |
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Quote:
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05-07-2024, 07:36 AM | #5 |
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Are you running the flex fuel kit? What type of fuel are you using?
Have you tried dropping back to their OTS 91 maps? Maybe it's a fuel quality issue. |
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05-07-2024, 06:50 PM | #7 |
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I'm running 93 oct, I'm east coast so they only have 93. No flex fuel kit.
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05-07-2024, 06:51 PM | #8 |
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if you mean resetting adaptation it helped with the timing corrections, but boost is still an issue.
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05-07-2024, 07:11 PM | #9 |
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05-08-2024, 11:16 PM | #10 | |
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Quote:
https://datazap.me/u/tochez/log-1715...log=0&data=4-6
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05-09-2024, 07:19 AM | #11 |
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The boost at the end is due to the load target change when you shifted gears.
It is odd that it can exceed the boost level before that point, yet it slowly drops below the target pressure up to the gear change. |
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