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BMW 3-Series (E90 E92) Forum
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Fuel Rail Pressure
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| 03-21-2017, 02:26 PM | #1 |
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Fuel Rail Pressure
What are the dangers associated with running fuel pressure too low , my hpfp looks like its struggling big time here
http://www.datazap.me/u/mattone74/e6...og=0&data=3-21
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N54 E91 Msport Wagon, VRSF 7"FMIC, VRSF DPs,
BMS OCC, BMS DCI, RB PC Valve, Wavetrac LSD, MHD Wedge , ER Charge Pipe, Nuke Performance Bov, MMP Inlets, Fuel-It Stage 2 Bucketless |
| 03-21-2017, 03:25 PM | #2 |
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Drives: '09 135i Manual
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I would have thought nearly 3000psi at the redline was pretty bloody good. I'd be happy if mine was there.
Incidentally, maybe someone can answer- why do some logs show the rail pressure increasing right up until the redline and some show it decreasing?
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'09 AW N54 135i 6MT - CIC - Logic 7 HiFi - MHD Stage2+ 98 - Wagner Evo 1 Performance I/C - VRSF Intakes - STC downpipes - Berk Race Axleback - 550i Clutch - BMWP Mirrors / Diffuser / Grilles / Skirts / Y-Pipe - SSDD Spoiler
12.9sec 1/4 mile @ 112mph - Santa Pod |
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| 03-21-2017, 03:30 PM | #3 |
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Hace a look at one of my logs here. Yours looks much better in terms of hpfp http://www.datazap.me/u/speedychuck/...0&data=3-23-24
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'09 AW N54 135i 6MT - CIC - Logic 7 HiFi - MHD Stage2+ 98 - Wagner Evo 1 Performance I/C - VRSF Intakes - STC downpipes - Berk Race Axleback - 550i Clutch - BMWP Mirrors / Diffuser / Grilles / Skirts / Y-Pipe - SSDD Spoiler
12.9sec 1/4 mile @ 112mph - Santa Pod |
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| 03-21-2017, 06:06 PM | #4 | |
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Quote:
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N54 E91 Msport Wagon, VRSF 7"FMIC, VRSF DPs,
BMS OCC, BMS DCI, RB PC Valve, Wavetrac LSD, MHD Wedge , ER Charge Pipe, Nuke Performance Bov, MMP Inlets, Fuel-It Stage 2 Bucketless |
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| 03-21-2017, 06:18 PM | #6 | |
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Quote:
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N54 E91 Msport Wagon, VRSF 7"FMIC, VRSF DPs,
BMS OCC, BMS DCI, RB PC Valve, Wavetrac LSD, MHD Wedge , ER Charge Pipe, Nuke Performance Bov, MMP Inlets, Fuel-It Stage 2 Bucketless |
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| 03-21-2017, 06:20 PM | #7 |
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Drop it down to e50 and see if you can hold rail pressure above 1000 psi above the entire run. Hpfp is mechanically driven so it's natural to see a correlation of higher pressure at higher rpm. You need to focus on maintaining rail pressure at low to mid range.
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