Little bit of cleanup to happen on the welds.
Look's good
Fuel Rail DIY
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E55 AMG, 72' Toyota Carina, 63' Ford F100, 72' Mercedes 250c, 15' Harley Davidson Softail
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Joined: Mar 2009
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From: Alpharetta Georgia
2006 E55, 2006 saab 93 aero, 2010 glk 4m
From what I see on my car, i believe you only get full bust once you're in third and beyond. Combine that with the drag at 130MPH and hitting redline (max boost) you have more load, more air and risk running out of fuel.
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From: Florida-Germany-New York
2004 E55,1969 300SEL6.3,2011 ML350 BlueTec Diesel,2005 ML400 CDI
Looks like it got quite hot. Are the new fittings SS? Hope there is no carbon buildup on the inside of the rail which will eventually find its way to the injectors. To really be done properly, the rail should be flooded with inert gas.
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05 E55
Out Of Control!!
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From: Boston, MA
00 MB ML55, 91 Toyota Supra Turbo(sold), 06 E500(gone), 03 BMW M3
if you were to use stock injectors, is this mod still worth it? or is this ONLY if you are going with a bigger injector?
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From: Southern California
E55 w/ goods, Z32 Project underway
Have not seen any issues with a stock motor explaing why Benz skimped here vs other models with a looped fuel rail, if mod'd then you should do both larger injectors and fuel rail. Under $100 for this mod & larger injectors are cheap enough.
Last edited by pearlpower; Jan 28, 2012 at 12:20 PM.
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Joined: Apr 2011
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From: Grand Rapids, MI
S55 AMG
Awesome thread, I 'm looking into doing this same mod. I already have upgraded injectors, just need to rail know. What about re-welding the gas feed line to the rear of the rail....
And still welding on your an fittings on the front and making it a loop???
And still welding on your an fittings on the front and making it a loop???
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From: Queen Creek AZ
2004 E55 AMG
Guys with rails you then need to have a custom/dyno tune correct? I have the EC/Jerry Stage 3 "Box" tune which works great. However if I do rails, I'll have to do a custom tune then?
Just confirming.
Thanks!
Alex
Just confirming.
Thanks!
Alex
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From: North NJ
2002 C32 AMG, 2013 GLK 350/4, 2015 E63S AMG Wagon
Thread Starter
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From: Treasure Island, FL
GLE 63S
Yes you will need to have the car tuned after a fuel rail install as the tuner needs to scale the fuel settings for the higher flow injectors.
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From: Treasure Island, FL
GLE 63S
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From: London, UK
No longer stock '06 E55, A3 3.2 Quattro, GLE 400d, R107 280SL, Golf Polo
I would say injeectors are probably more important than the rail ... static injectors on a looped rail wont help much!
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From: London, UK
No longer stock '06 E55, A3 3.2 Quattro, GLE 400d, R107 280SL, Golf Polo
The logic why this is a problem at 3/4th gear (and beyond) is the amount of time you spend at wot at high rpm... 1st and second are only brief moments at WOT so the fuel flow has time to catch up assuming it becomes deficient or the injectors go static. In higher gears you spend more time at sustained high rpm leaving more chance for the injectors to go static and for a fuel flow pressure drop to occur - and for longer periods of time, and so there is the possibility of going lean / detonating.
I still dont quite get the physics why the #8 cylinder should be the low pressure point in the OEM fuel rail but evidence suggests its the first cylinder to go for some reason, and so we have to assume there is more of a pressure drop here then elsewhere in the loop.
I think what is critical for us is making sure our cars fuel pressure is up to speed and our fuel pumps/filters are spotless. This is critical IMHO. I think if you have solid pressure / clean system you should be ok with OEM setup, but as we have seen there have been issues with cars going boom ....
I would say SLR injectors should be sufficient on OEM loop but closed loop and SLR injectors should be plenty of headroom. And of course there is the TTM alternative too.
Personally I have neither but then I dont have a very agressive tune... I just have not found a looped rail that looks OEM enough for me yet. On the injector side Kleeman swear you dont need bigger injectors even on K4 + gas flowed heads... so honestly I dont know what to think anymore.
I still dont quite get the physics why the #8 cylinder should be the low pressure point in the OEM fuel rail but evidence suggests its the first cylinder to go for some reason, and so we have to assume there is more of a pressure drop here then elsewhere in the loop.
I think what is critical for us is making sure our cars fuel pressure is up to speed and our fuel pumps/filters are spotless. This is critical IMHO. I think if you have solid pressure / clean system you should be ok with OEM setup, but as we have seen there have been issues with cars going boom ....
I would say SLR injectors should be sufficient on OEM loop but closed loop and SLR injectors should be plenty of headroom. And of course there is the TTM alternative too.
Personally I have neither but then I dont have a very agressive tune... I just have not found a looped rail that looks OEM enough for me yet. On the injector side Kleeman swear you dont need bigger injectors even on K4 + gas flowed heads... so honestly I dont know what to think anymore.
Last edited by stevebez; Feb 7, 2012 at 02:36 PM.
