[stewbets]

Originally Posted by Saif2018

Guys If im only gonna be using 93 octane fuel, at what stage should I be thinking about LPFP upgrade?

What do your logs look like? If you're not dipping below 50 PSI on a pull then you're fine. You really shouldn't need to upgrade unless you have upgraded turbos or are running ethanol, but your logs will tell the whole story.

[Saif2018]

Originally Posted by stewbets

What do your logs look like? If you're not dipping below 50 PSI on a pull then you're fine. You really shouldn't need to upgrade unless you have upgraded turbos or are running ethanol, but your logs will tell the whole story.

Typically 70+ on LPFP, only rarely drops to high sixties, which the lowest it goes.

Ok, that's good to hear, I was thinking if I go Stage 2+ would need LPFP upgrade.

Thanks, will keep an eye on the LPFP on logs.

[iqraceworks]

I’m hoping that with the BMP 90 degree walbro fitting, and no other rubber lines or clamps to fail…this setup should be pretty reliable. Yes, I’m going to cut the bottom out of the bucket, but I’m not planning on ever tracking my car….except for a few passes down the drag strip. Tons of people run bucketless setups……and it sounds like as long as you don’t let your fuel tank get low when you are at the track, you don’t really have many issues.

I would think that as far as reliability goes, it should be close to the oem unit……as long as that new 450 pump doesn’t pull so many amps that it cooks the EKP…..but I don’t really hear of too many people having issues with that. I guess time will tell.

[stewbets]

That BMP fitting is pretty cool. I'm sure your setup will be great. I intend to let my tank go very close to empty before the next fill up so I can see if anything weird happens.

[stewbets]

Thought I should report that my fuel hose connecting the pump to the factory line popped off of one of the fittings a couple days after install. That hose gets pretty soft when in contact with gas, so what I thought were tight clamps were relatively loose. They're definitely tight now, but that BMP 90 degree fitting is probably the best solution.

[iqraceworks]

Originally Posted by stewbets

Thought I should report that my fuel hose connecting the pump to the factory line popped off of one of the fittings a couple days after install. That hose gets pretty soft when in contact with gas, so what I thought were tight clamps were relatively loose. They're definitely tight now, but that BMP 90 degree fitting is probably the best solution.

Yep, I got my BMP fitting in yesteday. It looks like a really nice piece.

Hopefully in the next week or two I'm going to pull my LPFP, and drop in the new Walbro 450. I'll post of lots of pics!

I've decided to keep the bucket intact, and use the venturi.....seems like people have too many fuel starvation issues by not using the venturi and just cutting the bottom out of the bucket.

[iqraceworks]

Well, I got the new Stage 2 Walbro 450 LPFP installed last night. That BMP fitting is pretty slick....it's a nice and clean install, no other fittings or hoses to work with. Zip-tieing everything together makes me a little nervous....but everyone does it, so I'm assuming it should be ok.

The car fired right up, nothing exploded , and I'm getting right at 72psi at idle.

Looking forward to getting out this weekend and running some logs to see how it does. I'll probably switch over to an E40 tune the next time I fill might. Might as well take advantage of the added flow of this pump I guess

[stewbets]

Noice! Definitely need to get that ethanol flowing! Bummer that you decided to hack up a perfectly good bucket, though

Are you going to do some low fuel tests with your setup or just always keep it above 1/4 or 1/2 tank?

[iqraceworks]

Originally Posted by stewbets

Noice! Definitely need to get that ethanol flowing! Bummer that you decided to hack up a perfectly good bucket, though

Are you going to do some low fuel tests with your setup or just always keep it above 1/4 or 1/2 tank?

I might do some tests just for the hell of it. From everything I've seen online......hard launches and drag racing doesn't really case fuel starvation with the bucketless pump setups...it's the hard cornering. I could I could take the car on some twisty roads and log the LPFP pressure.

[_N54]

I'm going to test the BMP stage 2 bucket-less through some canyons with 1/4 and less some time soon. Ill keep my eye on the logs, but it should be fine in my opinion.

[iqraceworks]

Originally Posted by ///S58

I'm going to test the BMP stage 2 bucket-less through some canyons with 1/4 and less some time soon. Ill keep my eye on the logs, but it should be fine in my opinion.

From what I've read....you only really have fuel starvation issues if you are low on fuel, and taking big, long, high-G sweeping turns on a track.

But who knows ...it would be nice to see some actual data.

[chadjones99]

Anyone using this ? and if so what results ?

https://www.ecstuning.com/b-fuel_it!...k1~dk/?pdk=AQE

[iqraceworks]

Originally Posted by chadjones99

Anyone using this ? and if so what results ?

https://www.ecstuning.com/b-fuel_it!...k1~dk/?pdk=AQE

You can get a better flowing pump for about half the price if you do the DIY stage 2 Walbro 450

[Aceway]

Originally Posted by ///S58

I'm going to test the BMP stage 2 bucket-less through some canyons with 1/4 and less some time soon. Ill keep my eye on the logs, but it should be fine in my opinion.

Should bring a jerrycan with you. Even at 1/2 tank, hard cornering will cause fuel starvation on a completely bucketless system. I'm sure the cut out bucket helps a bit. Only speaking from my experience.

[iqraceworks]

Originally Posted by Aceway

Should bring a jerrycan with you. Even at 1/2 tank, hard cornering will cause fuel starvation on a completely bucketless system. I'm sure the cut out bucket helps a bit. Only speaking from my experience.

I did some hard straight line pulls with 1/8th tank of fuel with my "bucketless" DIY stage 2 LPFP.....no issues at all. No surprise though.....it's the cornering that gets you.

Yes...I would be interested in seeing some cornering tests with low fuel levels in the tank.

[Aceway]

Originally Posted by iqraceworks

I did some hard straight line pulls with 1/8th tank of fuel with my "bucketless" DIY stage 2 LPFP.....no issues at all. No surprise though.....it's the cornering that gets you.

Yes...I would be interested in seeing some cornering tests with low fuel levels in the tank.

There is already enough information out there to know what the end result will be. I can't link it since it's on one of the other forums.

[mweisdorfer]

Originally Posted by stewbets

Noice! Definitely need to get that ethanol flowing! Bummer that you decided to hack up a perfectly good bucket, though

Are you going to do some low fuel tests with your setup or just always keep it above 1/4 or 1/2 tank?

Stew Bets - I agree with you. I would if installed a smaller filter & kept the bucket intact. One could run a Stainless Steel "T" fitting for the fuel connections. One for to the fuel line & one going to the Venturi. That's how the $375-400.00 stage 2 pumps come when you buy them.

[titan.n54]

Originally Posted by stewbets

I used a 5/16" fuel rail to 3/8" barb straight fitting.

https://www.ebay.com/itm/133408791555

basically you followed the Vehicular DIY's video but don't cut the bottom end of the bucket, right?

Any problems to this day?

[k90]

I'm looking to replace or upgrade LPFP + filter + pressure regulator as preventive maintenance for my N52. Also want to have an option for 350-450hp.

Thing with the pump is that for the price of VDO stock pump assembly 330eur I can buy virtually any pump. It's the most expensive (LP) fuel pump I have seen. Is there any adverse effects for doing the same walbro 450 install that you guys have, but for stock N52(190kW)? Does the EKP heat up abnormally in daily driving or only in more intense driving when the pump needs to do more work?

Why is filter assembly different between N52 and N54?
N52 - 16117163295
N54 - 16147163296

Is the pressure regulator or filter cardridge replaceable without buying the whole assembly? I found while browsing parts this Japanparts FC-H14S. Looks like a fuel filter cardridge possibly fitting to filter assembly? Have not found a regulator yet. Any hints? Should I try to use the old assembly or just throw a new one there?

[oVeRdOsE.]

Originally Posted by k90

I'm looking to replace or upgrade LPFP + filter + pressure regulator as preventive maintenance for my N52. Also want to have an option for 350-450hp.

Thing with the pump is that for the price of VDO stock pump assembly 330eur I can buy virtually any pump. It's the most expensive (LP) fuel pump I have seen. Is there any adverse effects for doing the same walbro 450 install that you guys have, but for stock N52(190kW)? Does the EKP heat up abnormally in daily driving or only in more intense driving when the pump needs to do more work?

Why is filter assembly different between N52 and N54?
N52 - 16117163295
N54 - 16147163296

Is the pressure regulator or filter cardridge replaceable without buying the whole assembly? I found while browsing parts this Japanparts FC-H14S. Looks like a fuel filter cardridge possibly fitting to filter assembly? Have not found a regulator yet. Any hints? Should I try to use the old assembly or just throw a new one there?

This is a good question.

Did you look if EKP is the same?

I did look for the pump, and they were the same, my N54 runs on my stock N52 LPFP, for now...

Planning to go Walbro 450 DIY, which is a known mod and stock EKP ''should'' hold up. I saw a thread about someone adding active cooling, Ill visit this solution perhaps, but with passive cooling. (https://www.e90post.com/forums/showthread.php?t=1737938)

Also what is your plan to pump those N52 numbers?
any reason for preventive maintenance ? high mileage? dirty fuel in your area? curious. Mine got 270k km , and still running great even on my n54 swap.

[k90]

Originally Posted by oVeRdOsE.

Did you look if EKP is the same?

Same.

Originally Posted by oVeRdOsE.

Also what is your plan to pump those N52 numbers?

MILVs(as I already have them in a box), injectors, turbocharging, tune would be the reasonable approach for such low bump from 260hp -> 350hp. I rather have good response and keep driveable torque curve. It has been established that between 500hp-600hp it throws rod with stock internals.
But I'm unreasonable and trying to find an engine to rebuild first and have all fresh stuff and forged internals so it could take more torque too. But will see.. this is all talk.

Originally Posted by oVeRdOsE.

any reason for preventive maintenance ? high mileage? dirty fuel in your area? curious. Mine got 270k km , and still running great even on my n54 swap.

270k km here too. No problems that I know. These pumps are quite good as otherwise everyone would be complaining. But.. also these pumps are being sold by various brands on every auto parts site. As a result of somebody buying them! If it really was forever part it would only be sold by Bavaria parts desk. The pump is consumable and the pay out for resolving potential stranded situation is something to consider.


Back to issue at hand:
Do anyone have known miles/kilometers at which the pump or other parts in fuel supply have started struggling?

What is the difference between N54 and N52 filter assembly with diff of one in part code?

Does replacement pump need to be type w/ or w/o check valve?

Relief valve pressure doesn't matter if 7 or 10bars?

Does stock DME automatically adjust to new pump so that it doesn't run at way higher power than is required? Is there any feedback loop?
EDIT: EKP doesn't have any inputs apart from WKUP. Fuel rail doesn't have anything but the injectors.
Only position 20 in this picture looks like potential fuel pressure sensor. And is not being utilized in neather of 330 or 335.
https://www.realoem.com/bmw/enUS/sho...diagId=16_0596

Plan

Looking at Bosch 450litre pump. It has vertical mesh filter instead of the sock that doesn't seem to fit inside the bucket. But it cannot fit into the pump fixture inside the bucket if Walbro 450 does as it's diameter is larger. Just make new fixture out of couple of steel bands and strips of stainless as struts to be rivetted to the sides of the bucket.

Found 140eur filter/regulator assembly VDO brand with correct part code. I guess I go with that and never think about it again.