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BMW 3-Series (E90 E92) Forum
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LPFP dipping
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10-26-2016, 09:51 AM | #45 | |
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I'd imagine...that's pretty much the end of the line from what I understand. I believe there's a relay that supplies power to the DME itself (behind the glovebox?), so maybe that's worth looking into lol wild goose chase #9 I think..?? https://www.realoem.com/bmw/enUS/sho...diagId=61_2220 |
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10-26-2016, 10:21 AM | #48 | |
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10-27-2016, 10:29 AM | #52 | |
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In other news, I switched from the MHD E40 tune (~E50 mix) to the MHD E60 tune (~E70 mix) the other day. Seems like LPFP pressures are similar even after adding more Ethanol into the tank lol go figure. HPFP is struggling a bit, so I'll probably target closer to an E60 mix next fill up to see if numbers improve: E40 http://www.datazap.me/u/fcobra94/log...2&zoom=206-260 E60 http://www.datazap.me/u/fcobra94/log...4&zoom=135-220 |
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10-31-2016, 09:18 AM | #54 |
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11-01-2016, 10:35 AM | #55 |
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lol, i wasn't refering to your post. i was refering to doublespaces post about switching to fuel-it. chill.
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335i - aFe intake, AMS fmic, Decat, downpipes, BMS chargepipe, JB4, JB4 backend.
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11-01-2016, 03:06 PM | #56 |
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Has anyone here have a anti theft system?
Because I had one. I deleted it, and after some runs the lpfp started to rise back to normal idle pressure of 75. Didn't have the possibility yet to check if it's fine up top, but at idle it's acting normal for the moment. Update, it still drops below 50 after 6k rpm. Last edited by Martijn; 11-04-2016 at 06:22 AM.. |
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11-23-2016, 02:53 PM | #58 |
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11-28-2016, 12:15 AM | #60 |
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I have a Z4 with Hexon RR600, FBO+Inlets/Outlets, TBI and Stage 2 Fuel-It pump. Lpfp drops below 40psi above 6000 rpm with a BQ E65 Tune at 20psi. Running 20 psi on 93 oct and no TBI, pressure stays above 60psi. I will buy a used EKP and try that...do I need the dealer to code after I install?
Map of E65 is http://datazap.me/u/dwspen01/hexon-r...0&data=3-23-24 Since I have a Z4, I use a standalone LPFP sensor so it is not in the log but you see my HPFP crash above 6200 rpm to nearly 700psi. Any suggestions would be greatly appreciated.
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2009 Z4 DCT - Hexon RR600, MMP Inlets/Outlets, Wagner EVO 2 Comp FMIC, Fuel-It TBI, Fuel-It Stage 2 LPFP, ER CP, Forge DVs, N20 TMAP, BQ Tune 93/E65, BMS DCI, AR Catless DPs, BMS OCC, RB PVC
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11-28-2016, 12:58 AM | #61 |
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No LPFP logged? Rail pressure is your HPFP, but that's falling bad, so I'm sure LPFP is tanking. I can't believe you even stay on it that high if you know it's like that. It's probably the TBI keeping bank 1 OK, but bank 2 is down to 14:1 AFR and look at your trims. Bank 2 is pegged and running lean, you're just flat out of fuel supply. You need more LPFP or less E85, a new module isn't going to fix your issue.
Edit: Just remembered Z4's have a different setup and not sure if they have LPFP to log. Either way, judging by the HPFP curve, you're just out of fuel. Last edited by RSL; 11-28-2016 at 01:06 AM.. |
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11-28-2016, 06:34 PM | #62 | |
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2009 Z4 DCT - Hexon RR600, MMP Inlets/Outlets, Wagner EVO 2 Comp FMIC, Fuel-It TBI, Fuel-It Stage 2 LPFP, ER CP, Forge DVs, N20 TMAP, BQ Tune 93/E65, BMS DCI, AR Catless DPs, BMS OCC, RB PVC
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11-28-2016, 11:22 PM | #63 | |
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09-23-2018, 11:10 PM | #64 |
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Lots of good info in this thread - most of which my pea brain cannot comprehend.
I installed vtt gc lites and boostconepts stage 2 bucket, and recently had the lpfp code, and the power circuit(the one specific to the battery)pop up and have seen psi dip to below 40 on wot. Running mhd stage 2+ E30. Inlets, outlets, downpipes and intercooler. What are the odds this could be an install error that lead to a small pressure leak or electrical connection issue? Also, o2 sensor codes are present as well(my sloppy diy dp install probably killed one or both of them) **Battery code issue and o2 sensor codes were present before lpfp and turbo install. I should also add that my hpfp may also be suspect as I’ve had intermittent issues with long starts. Does the hpfp have any direct effect on the lpfp psi? I don’t have any logs running e30, but here was a non standard log(a few gears) running the same hardware but with mhd stage 2+ 91: https://datazap.me/u/drunkentrader/l...g=0&data=13-23 Last edited by drunkentrader; 09-23-2018 at 11:20 PM.. |
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