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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 > 100% e85 on cobb bms flash?



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      11-30-2012, 01:15 PM   #23
Wedge1967
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Quote:
Originally Posted by EastCoast335i View Post
Hi, where is this DIY for the Walbro E85 pump? I searched in the DIY section but couldnt find it.
Not really a DIY, but a possible solution.

Possible N54 Fuel Pump Upgrade
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      03-25-2013, 04:49 AM   #24
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Originally Posted by Wedge1967 View Post
No one is telling you that you can't go out and buy the biggest pump you can find and customize it to fit your car. You have options and that's why I can't understand why people keep making a big deal out of this. If your LPFP is failing, replace it. You can replace it using the DIY with the Walbro E85 pump, or pickup a new OEM. Or you now have the option of running a plug-n-play inline booster pump that goes inside your tank. It's very simple, but you have to make your own choice. I can tell you all day long that it works for me and I have it installed and have tested it. Or you can listen to someone assumptions because they are skeptical, haven't tested it, but still think they know better. Trust me, I was skeptical also... but again, it works...
The crazy thing is i just got a brand new hpfp and upgraded to the walbro 450lph...i still get fuel pump codes and both of these are brand new... I run about 70% e85 with the jb4 g5 n bms flash...thinking if the inline booster will help me bcuz i surely thought the single walbro would... Ps. The car only give me fuel pump codes on map 7 18.5psi when wot from 2nd gear on...map 5 is ok most of the time
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      03-25-2013, 05:07 AM   #25
enrita
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are you holding low pressure fine? you should see always 70 psi or so across the board.
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      03-25-2013, 07:11 AM   #26
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      03-25-2013, 09:15 AM   #27
Wedge1967
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Quote:
Originally Posted by O2nice View Post
The crazy thing is i just got a brand new hpfp and upgraded to the walbro 450lph...i still get fuel pump codes and both of these are brand new... I run about 70% e85 with the jb4 g5 n bms flash...thinking if the inline booster will help me bcuz i surely thought the single walbro would... Ps. The car only give me fuel pump codes on map 7 18.5psi when wot from 2nd gear on...map 5 is ok most of the time
You have to be careful not to introduce additional head loss into the equation by using restrictive fittings or sharp bends. If you have a T fitting, you really need to change that to a Y fitting. Tony did a dual pump in parallel, you could try that and see if that helps. Funny thing, I never had any codes in 2nd gear. Always 3rd to 4th at WOT post shift. Good luck.
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      03-25-2013, 11:01 AM   #28
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Fwiw, we have supported 600whp (no meth) with a single turbo running straight e85 with just our inline LPFP add-on. No codes. Also, be wary that the cheaper inline pumps from walbro don't quite flow as well as one may need with a big turbo upgrade. Nor does it seem as if they are e85 submersible for long term use. The phrase "you get what you pay for" seems to apply here.
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      03-25-2013, 01:17 PM   #29
Mike@N54Tuning.com
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Quote:
Originally Posted by O2nice View Post
The crazy thing is i just got a brand new hpfp and upgraded to the walbro 450lph...i still get fuel pump codes and both of these are brand new... I run about 70% e85 with the jb4 g5 n bms flash...thinking if the inline booster will help me bcuz i surely thought the single walbro would... Ps. The car only give me fuel pump codes on map 7 18.5psi when wot from 2nd gear on...map 5 is ok most of the time
It's a details business. If your low pressure is below 70psi then the booster or replacement pump will bring it back up to 70psi. If it's not then it isn't an issue. A CSV log will tell you everything you need to know. Just email it in to BMS if you need further advice on how to resolve it.

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      03-25-2013, 10:26 PM   #30
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Quote:
Originally Posted by shiv@vishnu
Fwiw, we have supported 600whp (no meth) with a single turbo running straight e85 with just our inline LPFP add-on. No codes. Also, be wary that the cheaper inline pumps from walbro don't quite flow as well as one may need with a big turbo upgrade. Nor does it seem as if they are e85 submersible for long term use. The phrase "you get what you pay for" seems to apply here.
Shiv - do you have any datalogs that show HPFP is not taking a nose dive on a FBO twin turbo car?
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      03-26-2013, 12:06 AM   #31
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Quote:
Originally Posted by O2nice View Post
The crazy thing is i just got a brand new hpfp and upgraded to the walbro 450lph...i still get fuel pump codes and both of these are brand new... I run about 70% e85 with the jb4 g5 n bms flash...thinking if the inline booster will help me bcuz i surely thought the single walbro would... Ps. The car only give me fuel pump codes on map 7 18.5psi when wot from 2nd gear on...map 5 is ok most of the time
I've seen several cases where the DIY pump was not installed correctly. There's a few small details that are important and if you don't know what you're doing you might miss something. The instructions have changed several times since it first came out, I haven't looked at it recently to see if they worked out all the problems yet.
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      03-26-2013, 12:54 AM   #32
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Quote:
Originally Posted by Dave W. View Post
I've seen several cases where the DIY pump was not installed correctly. There's a few small details that are important and if you don't know what you're doing you might miss something. The instructions have changed several times since it first came out, I haven't looked at it recently to see if they worked out all the problems yet.
i had a local shop do it for me and i had bought the two plastic tees in terrys description and they didnt install the T connector just the one that has 2 ends...i dont even kno how it was installed...i think that may be the culprit
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