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2Addicts | BMW 2-Series forum Technical Topics N55 (M235i) Engine, Transmission, Exhaust, Tuning Bad lpfp or hpfp?

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      04-15-2021, 04:35 PM   #1
ahakim24
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Bad lpfp or hpfp?

I switched to the e30 map on bm3 last night. the car misfies/stutters past around 4k rpm. looking at my log the fuel rail pressure is very low. would this be caused by a bad lpfp or hpfp?
https://www.bootmod3.net/log?id=6078...90c62b7f2b0e07
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      04-16-2021, 10:05 AM   #2
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Quote:
Originally Posted by ahakim24 View Post
I switched to the e30 map on bm3 last night. the car misfies/stutters past around 4k rpm. looking at my log the fuel rail pressure is very low. would this be caused by a bad lpfp or hpfp?
https://www.bootmod3.net/log?id=6078...90c62b7f2b0e07
HPFP is dipping looking at target vs actual. Usually caused by too much ethanol from what I believe. Was this your first time filling up on E30?
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      04-16-2021, 11:04 AM   #3
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Quote:
Originally Posted by 1slow2_ View Post
HPFP is dipping looking at target vs actual. Usually caused by too much ethanol from what I believe. Was this your first time filling up on E30?
first time yes
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      04-16-2021, 11:35 AM   #4
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Did you measure the concentration at the pump before mixing?
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      04-16-2021, 11:41 AM   #5
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Originally Posted by Pray for Mojo View Post
Did you measure the concentration at the pump before mixing?
yup. tested spot on
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      04-16-2021, 02:41 PM   #6
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Quote:
Originally Posted by ahakim24 View Post
yup. tested spot on
Unfortunately you probably have one like mine that doesn't like E30 on stock HPFP. I don't know if its the ambient temperature is too low or what, but mine crashes at 5k and I just don't run it now.
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      04-16-2021, 04:04 PM   #7
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Quote:
Originally Posted by ahakim24 View Post
yup. tested spot on
My first time on E30 was a month ago and my calculations were spot on. Drove around for like 20 miles before WOT and logging though. No fuel pump dips. Maybe your fuel pump just doesn't like E30 like what Pray for Mojo was stating. I would try to fill again when your pump is empty and see what the results are. If the same thing happens it probably means your car doesn't like it or you are somehow miscalculating.
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