[E92TiAg335i]

Hey guys. I have a 2013 E92 FBO 6MT 335i.

Do I need an upgraded fuel pump?

I like to run map 5 with about 4 gallons of e85, but i've noticed the car doesn't like more e85.


Will a fuel pump help?

Will it consume a lot more gas under normal driving?

Will the pump itself be a lot louder?

[Turbod]

Originally Posted by E92TiAg335i

Hey guys. I have a 2013 E92 FBO 6MT 335i.

Do I need an upgraded fuel pump?

I like to run map 5 with about 4 gallons of e85, but i've noticed the car doesn't like more e85.


Will a fuel pump help?

Will it consume a lot more gas under normal driving?

Will the pump itself be a lot louder?

Your HPFP fuel pump is the issue and to get an upgraded one you're looking north of $2,000. You have the option to run a port injection kit which will be a little bit cheaper. It will not consume anymore fuel under normal driving conditions. You should not hear any differences from the cabin. If you don't want to spend that much then look into a methanol kit for a little more fueling and knock suppression.

[jlegelis]

Yup, for late E92's the HPFP has limited flow due to design changes between the early and later builds. My rail pressure crashes under higher boost levels or too aggressive onset. The OP's comments ^^ are spot on.

[E92TiAg335i]

I see that a few companies have created HPFP for f30's...

Nothing for e92 or is port injection my only solution?

I heard port injection is "unsafe."
Is that true?

Low pressure fuel pump wouldn't provide "upgrade" of any sort?

[E92TiAg335i]

Tuning Tech FS, I believe, is the name I've heard of?

[WeekendWarriorz]

I have the same hpfp as you, the lpfp upgrade won't help anything. Our hpfp is maxed out around e30 with good boost/timing paired together. The cheapest option is Fuel-it!'s new chargepipe injection which replaces the TBI that they previously sold. If you don't want to end up paying 2k+ for TTFS upgrade then you'll need port injection which can be unsafe in certain situations. Fueling imo is the biggest issue on the N55 platform

[1nityrider]

Originally Posted by WeekendWarriorz

I have the same hpfp as you, the lpfp upgrade won't help anything. Our hpfp is maxed out around e30 with good boost/timing paired together. The cheapest option is Fuel-it!'s new chargepipe injection which replaces the TBI that they previously sold. If you don't want to end up paying 2k+ for TTFS upgrade then you'll need port injection which can be unsafe in certain situations. Fueling imo is the biggest issue on the N55 platform

Why is it or what makes it unsafe? I just don't know or understand why.

[WeekendWarriorz]

Originally Posted by 1nityrider

Why is it or what makes it unsafe? I just don't know or understand why.

Port injection isn't DME controlled so when the dme cuts fuel you're going to have times where the port injection is still dumping fuel in

[1nityrider]

Originally Posted by WeekendWarriorz

Port injection isn't DME controlled so when the dme cuts fuel you're going to have times where the port injection is still dumping fuel in

Ah I see. I thought you also get a port injector controller or some way of controlling the injectors. That too doesn't turn off the injector when DME cuts fuel or such a control is not possible?

[WeekendWarriorz]

Originally Posted by 1nityrider

Ah I see. I thought you also get a port injector controller or some way of controlling the injectors. That too doesn't turn off the injector when DME cuts fuel or such a control is not possible?

You do get a port injection controller but it's hard since it doesn't respond/react in the milliseconds that the dme makes a decision. For 99% of people they don't have a problem but the other 1% has blown motors. For instance if you misfire and it's dumping fuel.

Ex: https://bmw.***********.com/threads/...-failure.2166/

[E92TiAg335i]

Originally Posted by WeekendWarriorz

You do get a port injection controller but it's hard since it doesn't respond/react in the milliseconds that the dme makes a decision. For 99% of people they don't have a problem but the other 1% has blown motors. For instance if you misfire and it's dumping fuel.

Ex: https://bmw.***********.com/threads/...-failure.2166/

So basically, for someone such as myself, i should not get port injection then...

I daily my car and need it for work.

No car= me getting fired due to pissed off clients...

So i'm basically done with any mods then as i'm FBO already

[WeekendWarriorz]

Originally Posted by E92TiAg335i

So basically, for someone such as myself, i should not get port injection then...

I daily my car and need it for work.

No car= me getting fired due to pissed off clients...

So i'm basically done with any mods then as i'm FBO already

You can max out the stock turbo on e30 alone, you don't really need more e85 unless you're pushing a backend flash with high timing. Only upgrade fueling for a pure stage 2 or single turbo

[Turbod]

Originally Posted by E92TiAg335i

So basically, for someone such as myself, i should not get port injection then...

I daily my car and need it for work.

No car= me getting fired due to pissed off clients...

So i'm basically done with any mods then as i'm FBO already

I would buy a methanol kit and run chargepipe methanol injection and use E20 or E30 in the tank. You will be turbo limited but this will allow you to max out the stock unit if you want.

[DiFFv1]

Thanks needed this

[Cory S]

Originally Posted by Turbod

If you don't want to spend that much then look into a methanol kit for a little more fueling and knock suppression.

THIS^^^^

[The Silver Slammer]

Is it common for these N55 HPFPs to go out? I'm FBO, JB4 and MHD BEF and I have fuel cuts now that the weather has got colder (Higher Boost). Or could it just be that the pump is old and worn out? Got about 66k on the car, not driven much the last 5 years.

[Kev0]

Originally Posted by The Silver Slammer

Is it common for these N55 HPFPs to go out? I'm FBO, JB4 and MHD BEF and I have fuel cuts now that the weather has got colder (Higher Boost). Or could it just be that the pump is old and worn out? Got about 66k on the car, not driven much the last 5 years.

It's not supposed to be common. The guy that replaced my HPFP said that I'm the 2nd N55 he have seen with a bad HPFP and his shop specializes in BMWs, mainly N54s/N55s. I have a 2012 E92. HPFP most likely went bad a little before 50k when I think back about my misfiring issues but was diagnosed and HPFP replaced at 53k. My car have 54k miles now.

[The Silver Slammer]

I've just had bad misses/fuel cuts recently, re-gapped plugs to .021" to try to help mitigate the issues with no avail. Wondering what else it could be.

[weehe126]

Originally Posted by The Silver Slammer

Is it common for these N55 HPFPs to go out? I'm FBO, JB4 and MHD BEF and I have fuel cuts now that the weather has got colder (Higher Boost). Or could it just be that the pump is old and worn out? Got about 66k on the car, not driven much the last 5 years.

Are you getting fuel cuts or lose of traction causing overboost?

[The Silver Slammer]

Fuel cuts, I put it in sport mode, turn traction and DSC off, take off from a roll, like 50 mph and it down shifts then I feel it cutting out rapidly through the pull. I know what it feels like when it cuts fuel due to loss of traction, that sucks too, but its usually just one cut. This is like repetitive cuts.

[Kev0]

Originally Posted by The Silver Slammer

Fuel cuts, I put it in sport mode, turn traction and DSC off, take off from a roll, like 50 mph and it down shifts then I feel it cutting out rapidly through the pull. I know what it feels like when it cuts fuel due to loss of traction, that sucks too, but its usually just one cut. This is like repetitive cuts.

I think that was one of my symptoms also. It cuts out and downshift. I found it annoying.

[lwgrenier]

Originally Posted by The Silver Slammer

Is it common for these N55 HPFPs to go out? I'm FBO, JB4 and MHD BEF and I have fuel cuts now that the weather has got colder (Higher Boost). Or could it just be that the pump is old and worn out? Got about 66k on the car, not driven much the last 5 years.

It's common. Mine went around 62k