sneakyneon

No offence at all!, The answear is 2 parts, On the dyno there was a big dip in power at 4500 to redline, and no matter how much fuel we put at it it the afrs still creeped up. We figured it most lickly was a weak pump. So you say how much power are we taking? Its just a guess, but a rather fast E55 was there the same day and I have a bigger pulley and bigger TB but he had cams and LT and made 60+ more than me wile down low before 4500 our curves were very similar and I made a bit more peak TQ. If it is fuel this should fix it if not than I suspect that my headers are to blame.
Part 2
Its amazing how one thing leads to another. I'm sure after building an engine you know what I mean. there is no such thing as a drop in fuel pump upgrade and the big bosch's wont fit in the tank, so then that means you have mount them out side, but now the fuel line wont work that way so you have to run new line but the new line wont connect to the rail and now that you by passed the stock pumps the stock fliter and regulator are by passed so that means you need new ones of those. as you see it grows and grows and grows. This is hands down by far the most money spent on a mod to date.

beauphus

props!

TopGun32

man you move on mods fast! thanks for sharing all your work with us.

128 is no joke..

what kind of shortys do you have..? thats my next mod for sure.

sneakyneon

There a one off custom made and not very good. I got a god deal and they were a nice upgrade at lower HP but I think thre costing me up top at my current level

TwinAMG

wow, that looks great!! Do those pumps have integrated check valves? If not, I would add a set

Forrest Gump 9

Do you care to elaborate on how you get rid of those valves? I wanted too, but don't know what to do with the holes. Anyway, keep up the good job.

sneakyneon

There very close to 3/8 npt,I just ran a tap down ad far as it would go, 3/8 pipe plug and teflon paste.
A pic is worth....

kjlindgr

Wait...so you don't need those valves? WTF do they do anyway and does the ECU throw a CEL when they are removed?

sneakyneon

Its an EGR valve or some other fancy name MB gives it but it take hot exh and recerulates it back into the SC. There are plenty of info on the web about both good and bad with removing a egr valve, The car should throw code but it has not, it maybe its in the tune or mb has a low valve in the ecu and basicaly dose not check?

shardul

iTrader: (1)

for the egr valves did you just cap the inlets at the front of the S/C

AgSilver

First let me say that your fabrication and workmanship looks absolutely 1st class. However, I was wondering why an in-line boost pump (ie Bosch o44) in the feed line to the engine rail would not provide adequate flow and pressure? You must have already considered such an option as not to be a solution. My thoughts would be that with the existing dual pumps there should be enough capacity at the pumps themselves. Naturally there will be losses to pressure and flow based on line diameter and length, but that's why I thought a properly placed boost pump could maintain the necessary flow and pressure. What piece of the puzzle am I missing here?

sneakyneon

Because the that would be after the regulator and you could not control how much fuel pressure you would have.

Bellevue_E55

When we hitting Pacific Raceways on a wednesday evening ?

stevebez

Super install and some great clean work there...

One thing that has me a little concerned is the proximity of the open +ve lead of the right side pump to the mounting bracket... mbe the photo angle is exaggerating it a touch but mbe a boot to cover the power lead attachment on the pump?

I am curious why others running 550rwp+ have not had this fuel shortage issue... ? Is this mbe not an ECU / tuning thing or fuel line pressure / injector issue?

You got some super mods ...

Ali_E55

so it makes the S/C sucks some hot air, and removing them may make the IAT a bit cooler ??

there is no harm in removing them right ?

beauphus

Perhaps it is coincidence but I am in the 550+ club and I am having an issue in 3rd and 4th gear WOT that seems like a fuel issue. When I am WOT I get some sort of sputter and have been advised that it may be me running out of fuel. It typically only lasts a short period of time (1/2 second to a full second) and then the resumes its usual power but for that little period of time I am losing power and car seems likes its choking. It will be definitive this week as Jeremy is coming down and it will be on the dyno. Perhaps a fuel system upgrade is in my future.

Zod

I have this and so does eco form dubi, both tuned by him. Let me know asap if u get it sorted. only fix i have for it is to shift earlier or manuly control it. if u leave it in auto u get the stutter and pause when shifting 3rd to 4th

blackbenzz

How much timing are you guys running and are you possibly getting a misfire?

Zod

Don't know, what i know now is 3 people have it, who all have the same tuner...

SLK55-UAE

Zod add me to the list
i might be a bitf different case ( i'm driveing N/A 55 engine SLK55 )
but i do have the same issue
just to mention my SLK in not tunned
thanks

03RSTT

Very nice work and I understand how one thing led to another in this process.

I have a question on the stock system. Does the stock system have the single feed line to the engine and NO return line?

I understand the stock fuel pressure regulator is located in the tank with the pump. If this is the case, MB decided to comply with the 2005 US EPA mandate to eliminate the fuel return line from the engine. IMHO this is a major flaw in a performance vehicle and a big stress on the fuel delivery components which now have to be limited in the fuel tank. The fuel pressure regulator needs to be at the engine just after the fuel rail and the fuel pump must be allowed to flow constant pressure and volume to provide the needed flow and volume to the engine at pleak loads.

Again, nice work.

We just got ours back from the dealer from a repeated failure of the level sensor leaking and I have started to look into why the E55 is having this problem.

str8ridin

Sweet! As usual, a pioneer in the E55 community.

sneakyneon

There is no return from the fuel rail just a single in.

sneakyneon

Hey bro! good to see your still around, so got a cool ride these days?

AgSilver

The SLR uses 2 pressure regulators at the rail. Why not mimic the installation and add an inline pump?