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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Vishnu/FFTEC Flex-Fuel Kit Installation, Results & Driving Impressions



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      09-17-2012, 01:27 PM   #23
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Quote:
Originally Posted by drewmeyer87 View Post

Anyone know the BMW Part number for LPFP?
http://www.realoem.com/bmw/showparts...01&hg=16&fg=15
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      09-17-2012, 01:27 PM   #24
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Originally Posted by shiv@vishnu View Post
Yes, run a tank full of straight e85 at full boost. If you throw a 10716 code, you either need to reduce boost or (preferably) replace your stock LPFP.
What if you try running 80% e85 and get codes 10720 and 10721?
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      09-17-2012, 01:31 PM   #25
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Quote:
Originally Posted by drewmeyer87 View Post
Shiv, you said "Replace your stock lpfp", do you mean with another stock one or is there an upgraded one? I get maxed fuel trims and limp modes just running 30% e85, I'm fairly certain my LPFP isn't up to the task.

Anyone know the BMW Part number for LPFP?
We threw the code when I was around 67% E85 and replaced it with a stock one.
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      09-17-2012, 01:31 PM   #26
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Quote:
Originally Posted by drewmeyer87 View Post
Shiv, you said "Replace your stock lpfp", do you mean with another stock one or is there an upgraded one? I get maxed fuel trims and limp modes just running 30% e85, I'm fairly certain my LPFP isn't up to the task.

Anyone know the BMW Part number for LPFP?
16 14 7 163 298 Pump with level sensor (inside passenger side of the tank), $333.88 retail, less from online BMW parts dealers such as getbmwparts.com.

16 14 7 163 296 Fuel pressure regulator with filter (inside driver's side of the tank), $244.42 retail.

If the LPFP doesn't cure it, it may be a clogged fuel filter and/or bad pressure regulator. Try just replacing the pump unit, first, then if you still have problems (haven't seen any reported problems with the fuel filter/regulator unit yet) then you may need to replace that unit as well. The filter and regulator are together inside the tank, no more external fuel filter like older cars.
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      09-17-2012, 02:01 PM   #27
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The LPFP and Fuel Pressure Regulator/Filter a b1t(h ti replace?
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      09-17-2012, 06:49 PM   #28
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Great write up. Thanks Ryan!
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      09-17-2012, 06:56 PM   #29
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Quote:
Originally Posted by drewmeyer87 View Post
The LPFP and Fuel Pressure Regulator/Filter a b1t(h ti replace?
LPFP isn't too bad, just try to do it under half a tank I guess...I had about 5/8 and it was a little sloshy.
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      09-29-2012, 01:42 AM   #30
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Your review just sold me, gonna give the guys over at vishnu a call monday and hopefully get some time to get this put in next week !
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      10-03-2012, 09:15 AM   #31
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I'm sold as well. The ability to just throw whatever fuel you need to put into the tank without having to reflash the ECU is going to be amazing. Not to mention the power gains on an otherwise stock car. I can't wait until Monday rolls around so I can get the ball rolling.
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      10-03-2012, 09:21 AM   #32
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I'm sold as well. The ability to just throw whatever fuel you need to put into the tank without having to reflash the ECU is going to be amazing.
The fuel sensor only measures ethanol content and does not provide additional fuel volume. The volume "limits" seem to vary car to car, so you may require a flash either way.
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      10-03-2012, 09:38 AM   #33
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Originally Posted by RMTNSTI View Post
I'm sold as well. The ability to just throw whatever fuel you need to put into the tank without having to reflash the ECU is going to be amazing. Not to mention the power gains on an otherwise stock car. I can't wait until Monday rolls around so I can get the ball rolling.
You may still need Procedeflash for above 50% e85 concentrations.
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      10-03-2012, 12:27 PM   #34
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The fuel sensor only measures ethanol content and does not provide additional fuel volume. The volume "limits" seem to vary car to car, so you may require a flash either way.
No, it adjusts the timing and boost correctly according to the ethanol content. Fuel pressure will always be constant.

Quote:
Originally Posted by jippii ensio View Post
You may still need Procedeflash for above 50% e85 concentrations.
A reflash is part of running the flex-fuel kit.
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      10-03-2012, 01:09 PM   #35
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I want it now!!!!!
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      10-03-2012, 01:14 PM   #36
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Quote:
Originally Posted by Evil///M View Post
No, it adjusts the timing and boost correctly according to the ethanol content. Fuel pressure will always be constant.



A reflash is part of running the flex-fuel kit.



Exactly. Fuel pressure is controlled by the fuel pressure regulator, not by the ECU. It's a true FlexFuel setup.
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      10-03-2012, 01:47 PM   #37
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Quote:
Originally Posted by Evil///M View Post
No, it adjusts the timing and boost correctly according to the ethanol content. Fuel pressure will always be constant.



A reflash is part of running the flex-fuel kit.
I think you've misinterpreted what I meant. The piggyback fuel volume limit is defined by the largest constriction in the hardware, be it health or the combined upper/lower limits of each individual component. Two people could have the same mods and piggyback, one person with trims at 20% and the next person pegged at 34%.

I didn't know that the FF kit also came with a flash. If so then you shouldn't have an issue with OL fueling. It seems like they have adjusted it moreso with their latest flash to keep trims closer to zero.
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