[Forrest Gump 9]

Just wondering if anyone have a solution for the HPFP and direct-injection injectors? The fuel system seem to be the handicap for the 335/135. I think once there's a solution for it, the hp game will be wild.

[sd390r]

You would think there would be

I emailed a company that makes fuel pumps for evos , Walbro

they said "we have no interest in making a fuel pump for the n54 or any BMW and a custom application is simply out of the question"

real dicks... hope someone else does... maybe AR design, AMS, someone

[veightkiller]

^^ yeah that sux dude surely they had a great product.

[ericosaur]

Wow who at Walbro did you speak with? Bet it wasn't anyone important. Who talks like that?

[sd390r]

Dont know, emailed the address on the site and thats what I got back

[Dan335i]

Walbro makes one of the best fuel systems out there.Used them in both my Evo,s,and everyone i know with a serious high Hp and Trq. import uses them also. I cant see them just turning a blind eye to the N54.I,m willing to bet that in a short time AMS will come out with a solution to the fuel system in the N54.They have to if they are coming out with an uograde to the turbo,s (Turbo) for our cars.

[sd390r]

email them, see for yourself, NOT helpful

[ar design]

There is zero solid data proving the fuel system is anywhere near its limits, IMO. And FWIW, Walbro pumps suck - a Bosch, Weldon etc would be a far better choice.

[Forrest Gump 9]

Some-one need to volunteer and dissect the stock pump and see how to improve it ; ).

Or, I guess we can run 2 stock pumps in parallel.

[dvpouldar26]

Try aeromotive. Im sure AMS and ASR are both working on something if the limits of the stock system haven't been reached. I think it might take a while since for fuel upgrades sonce the N54 uses an all new fuel ststem with piezo-style injectors and DI. The fuel pressures are uncomparable to conventional fuel systems. There aren't any injector upgrades since the technology is so new. IMO, only time will tell.

[MRQturbo]

Originally Posted by ar design

There is zero solid data proving the fuel system is anywhere near its limits, IMO. And FWIW, Walbro pumps suck - a Bosch, Weldon etc would be a far better choice.

be the first one then....slap a big turbo kit on....test the limits...and see how long the motor lasts.......

[ar design]

Originally Posted by MRQturbo

be the first one then....slap a big turbo kit on....test the limits...and see how long the motor lasts.......

[BavarianBullet]

Originally Posted by Forrest Gump 9

Just wondering if anyone have a solution for the HPFP and direct-injection injectors? The fuel system seem to be the handicap for the 335/135. I think once there's a solution for it, the hp game will be wild.

I can't find the link at the moment but I was able to earlier find a little press info on the piezo direct injector AT vdo.com and its static flow rate in grams/sec was insane. Converting it to lb/hr yielded a potential HP number that I didn't write down but recalled it was huge. A lot more than we're likely to see anytime soon out of the N54. It's nothing like a port injector and apparently the difference is working in our favor assuming we can adjust the commanded delivery at the DME level with a flash etc.

The fuel pump is probably a much bigger issue since it's apparently built to unreal tolerances and the aftermarket need for them at the moment probably wouldn't justify the expense required to design and produce it. I know the DI audis have an aftermarket (rebuilt?) pump available so who knows.

BB

[flem]

Originally Posted by ar design

There is zero solid data proving the fuel system is anywhere near its limits, IMO. And FWIW, Walbro pumps suck - a Bosch, Weldon etc would be a far better choice.

Walbro's are terrible...

Weldon FTW!

[ar design]

Originally Posted by flem

Walbro's are terrible...

Weldon FTW!

Bosch makes a great pump (044) as does Fuelab, Weldon, etc. Id avoid Aeromotive/Walbro/etc