grantwoodtx

Teaser, Got welded today Little bit of cleanup to happen on the welds.

e55amgrocket

Look's good

blackbenzz

Nice!

nanayaw6

Looking sharp. Good choice on the color of the fittings. What kind of shop did you have do the welds btw?

AKnight55

Hmmm this thread looks familiar

bamaster

Remind me... what's the benefit of these fuel rails? Something about poor fuel distribution? Detonation? I read this somewhere, I forget.

AMG_RL

Fuel starvation of the #8 cylinder on wot pulls.

Great job on the rail BTW, looks very promising.

pearlpower

Welded mine a bit ago, came out great. Thanks for the update and #s.

RedBullJnky

Very nice!

AKnight55

Question for anyone that knows.. Why is it that the shift between 3rd and 4th at WOT is so dangerous as opposed to any other shift??

nanayaw6

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.

tbal

Nice work!

AgSilver

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.

theblckghst

i think its because the injectors go static during that rpm range, could be wrong though.

55fanatic

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?

pearlpower

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.

grantwoodtx

I'm out of town this weekend in Atlanta so once I get home I'll post up all the details and costs

Triman2008

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???

alextaylor29

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

chawkins2001

Damn that looks clean boet

Lenin

Ay updates on your project?

grantwoodtx

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.

grantwoodtx

My car is currently in the shop getting customer headers made and should be ready this Friday. I will be doing the fuel rail install and documenting the process from start to finish hopefully this weekend

stevebez

I would say injeectors are probably more important than the rail ... static injectors on a looped rail wont help much!

stevebez

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.