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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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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
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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
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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
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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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