RS4 Fuel return valve

[JC@DouglasVW]

What is the current best price for the RS4 valve? If i can get a few people together i can do $74 plus shipping...not sure how that comes in the market though.

[CoNGLoMeRaTeGTi]

I got mine for 100 shipped

I knew I houldve let you get it for me through your Audi connect.

Unfortunately, I was in a rush.

I'm going to PM you for some other parts.

[LEWXCORE]

Quote, originally posted by staulkor »

genuinevwaudiparts.com has the valve for $70.20 + shipping.

it would be in the market somewhere between genuinevwaudiparts and worldimpex.

[bokiNY]

So the TSI cars don't need one? If so, great news! More money for other mods...

[bokiNY]

Thanks CoNGLo, I did find it on ecs site and worldimpex but I was more interested in Staulkor's post where he was able to get it for $70 from genuinevwaudiparts.com - I couldn't find it there. Anyways, if TSI cars don't need one, great, I'll stop looking!

[staulkor]

Just go to genuinevwaudiparts.com, right in the middle on the left "Search by Part Number or Keyword". Paste in "079130757" and select Audi and search. It is right there, lol.

[bokiNY]

Thanks


Modified by bokiNY at 11:44 AM 3-30-2010

[blackcruiser]

When you did remove the manifold, did you replace your injectors gasket kit as well?

[2pt0tee]

Quote, originally posted by blackcruiser »

When you did remove the manifold, did you replace your injectors gasket kit as well?

In Rich's case... short answer no, long answer yes... LOL


Modified by 2pt0tee at 3:37 AM 4-1-2010

[Joeydabomb]

So I take it that there is no way of installing this without removing the manifold?

I cringe at the thought of removing it again.

[acespizee]

Can easily be done without removing manifold but you will have to bend fuel rail slightly and undo clips holding it in place, just be carefull not to break anything and a second pair of hands will definetly help. I paid no more than £35-£40 pounds for the RS4 Valve from TPS volkswagen.

[ilie.vw.tech]

have you installed rs4 valve in your car yet?

[ndifadvokit]

Quote, originally posted by ilie.vw.tech »

have you installed rs4 valve in your car yet?

Who are you asking? I think conglomerate has been running the valve for a while now. I just installed mine over the weekend.

For those interested, i honestly don't see how you could replace this valve either correctly or easily without removing the whole intake manifold assembly. It's a lot of work to r&r that manifold so believe me i would've loved to have found a way to swap the valve out without going through all that trouble. I just don't see a way; at least not without some special slim profile wrench or some other special tool which i don't own.

I was a little disappointed to see how much buildup had re-accumulated on my valves since the last cleaning i gave them but i attribute that mostly to the fact that my driving has changed almost to 100% city stop & go driving now with usually not enough time for the engine to get up to temp during my daily commute. I might post some pics later if anyone's interested.

As far as results...my 'before' logs show that my software is requesting 129.99 bar rail pressure but never meeting that, only getting as close as 127 in most cases and as high as 128.02 in one case. I've yet to do a set of 'after' logs because of all the rain so far. I will say the car feels much better now (even my wife noticed it) but that could be because of the valve cleaning more than anything else.

[CoNGLoMeRaTeGTi]

what he said. ^^^^

Quote, originally posted by ilie.vw.tech »

have you installed rs4 valve in your car yet?

I too will have logs once I get the car running upto my standards.

[ilie.vw.tech]

so its a direct fit from the rail no modification need? (from rs4 to gti fsi)

[chris@revotechnik]

Quote, originally posted by ndifadvokit »

For those interested, i honestly don't see how you could replace this valve either correctly or easily without removing the whole intake manifold assembly.

Remove the line going to the pump

remove t30 torx holding line to of manifold and one on the bottom right.

14mm crows foot to remove the line

17mm crows foot to remove the valve itself.

Install is reverse of removal

Can be done in about 10 minutes this way.

[08 passat turbo]

Quote, originally posted by ndifadvokit »

As far as results...my 'before' logs show that my software is requesting 129.99 bar rail pressure but never meeting that, only getting as close as 127 in most cases and as high as 128.02 in one case. I've yet to do a set of 'after' logs because of all the rain so far. I will say the car feels much better now (even my wife noticed it) but that could be because of the valve cleaning more than anything else.

im assuming your stage 2+...i believe a variance or 1-2 bar is acceptable for ur fuel rail pressure

[ndifadvokit]

Quote, originally posted by 08 passat turbo »

im assuming your stage 2+...i believe a variance or 1-2 bar is acceptable for ur fuel rail pressure

no, i'm running a k04 with rs4 injectors. A few bars lower could very well still be acceptable. I wasn't having any problems with my car before but i decided to install this valve anyways to see if it would make a difference or not. So far, the car feels a lot better but i'll see what my logs have to say before i draw any conclusions.

This valve is a direct fit on FSIs with no modifications needed.

That's good info from Chris. Chris, you could've posted that a few days earlier but better late than never. All i know is it wasn't possible to do the install with any of my standard wrenches. Anyways, no regrets.

[chris@revotechnik]

Quote, originally posted by ndifadvokit »

That's good info from Chris. Chris, you could've posted that a few days earlier but better late than never. All i know is it wasn't possible to do the install with any of my standard wrenches. Anyways, no regrets.

No problem, I hadn't thought of it before to post it even though I have done them this way.

No way I can think of to do it with normal wrenches but crows feet you can do it with the manifold on.

[ilie.vw.tech]

so it is a direct fitment? no mods needed.

[GolfRS]

Quote, originally posted by chris@revotechnik »

No problem, I hadn't thought of it before to post it even though I have done them this way. No way I can think of to do it with normal wrenches but crows feet you can do it with the manifold on.

Yes you can do it with normal wrenches and without removing the manifold

Although i must admit i had no idea a "crow's foot" tool ever existed..LOL..

[chris@revotechnik]

Quote, originally posted by GolfRS »

Yes you can do it with normal wrenches and without removing the manifold Although i must admit i had no idea a "crow's foot" tool ever existed..LOL..

Yeah i guess there are ways to get some tools in there. It just see it taking a really really long time only having that short of an area to turn it in. Maybe from the bottom if you get the crankcase line out of the way and have a stubby.

[ndifadvokit]

Quote, originally posted by ilie.vw.tech »

so it is a direct fitment? no mods needed.

Quote, originally posted by ndifadvokit »

This valve is a direct fit on FSIs with no modifications needed.

umm, yep.

[ilie.vw.tech]

thanks

[ilie.vw.tech]

does anybody have a picture of the two valves and compare it to each other

[GolfRS]

Quote, originally posted by ilie.vw.tech »

does anybody have a picture of the two valves and compare it to each other

Nothing to compare.

They are externally IDENTICAL...

[blackcruiser]

For those who have installed the rs4 valves, have you got a issue with petrol leakage before you retighten them? I had this issue initially and it's a bitch to get a modified wretch to tighten them without removing the manifold. But I guess it's all worth it after I drove it.

[CoNGLoMeRaTeGTi]

thats why i decided to remove my intake mani.

[ndifadvokit]

ok, it's been a full week since i've installed the new valve. Here are some before and after logs for those interested. The car feels a lot smoother and there was definitely a noticeable improvement after the install. Rail pressure now easily goes beyond 127. I cleaned the intake valves at the same time so it's possible that that added to the improvement. However, really there wasn't enough buildup in my opinion to make a noticeable difference in performance yet so i largely think the RS4 valve made the biggest difference in this case. The sample rate's not that great w/o turbo mode but i think the difference is still clearly visible.

[GolfRS]

Well looking at your logs, and also considering you are not using an aftermarket HPFP, i'd have to say there is ZERO difference as far as logs/numbers go.

I'd say what you are feeling is more of a placebo effect rather than actual gains from the valve...

Hell...it's cheap though right ?Why not install it anyways...

Yeah...

[Joeydabomb]

^ Zero differences in his logs? I'm seeing a 5 bar gain in his fuel pressure, that's pretty substantial IMO

[LEWXCORE]

Quote, originally posted by GolfRS »

Well looking at your logs, and also considering you are not using an aftermarket HPFP, i'd have to say there is ZERO difference as far as logs/numbers go. I'd say what you are feeling is more of a placebo effect rather than actual gains from the valve... Hell...it's cheap though right ?Why not install it anyways... Yeah...

LOL this is awesome logic.. i'm about to order one up too, but i want someone to show me that it's bringing a .5bar gain in low pressure fueling with logs.

Quote, originally posted by CupraK1 »

There is also a by-product of fitting the RS4 valve and this is that it alters the pressure in the in-tank low pressure pump. The OEM low pressure fuel pump before the valve was fitted started off at 4.5bar pressure, but gradually dropped to around 3.4bar pressure at higher revs when WOT. After the RS4 valve was fitted the in-tank pressure stabilised at between 4.1-3.9 bar across the entire run whilst WOT. This too could point to where you would get a drop in power around 5krpm as the in-tank low pressure fuel pump drops below 3.5bar around those revs, which is outside normal parameters and MAY cause fuel cuts or the ECU to back off the power. I must stress that all this is from readings taken from live logging on my car, but the diagnosis is subjective although compelling in the logic.

[ndifadvokit]

Quote, originally posted by GolfRS »

Well looking at your logs, and also considering you are not using an aftermarket HPFP, i'd have to say there is ZERO difference as far as logs/numbers go. I'd say what you are feeling is more of a placebo effect rather than actual gains from the valve... Hell...it's cheap though right ?Why not install it anyways... Yeah...

lol. Where are people getting my list of mods from?? I'm running an upgraded HPFP as well as RS4 injectors and a K04. If it's too hard for you to believe the RS4 valve caused any improvement i'm willing to aknowledge the gains could also be from cleaning the valves or possibly from fixing some unknown issue beforehand but i have a lot of logs from beforehand showing no pre-existing issues at all. So i'm going to stick with what i said before that this valve made a noticeable improvement. No placebo effect involved. I call things how they are.

[ndifadvokit]

Quote, originally posted by LEWXCORE »

LOL this is awesome logic.. i'm about to order one up too, but i want someone to show me that it's bringing a .5bar gain in low pressure fueling with logs.

There was no noteable difference in my low pressure fueling from before installing the valve to after installing it. It never dipped below 4bar.

[GolfRS]

Quote, originally posted by ndifadvokit »

lol. Where are people getting my list of mods from?? I'm running an upgraded HPFP as well as RS4 injectors and a K04. If it's too hard for you to believe the RS4 valve caused any improvement i'm willing to aknowledge the gains could also be from cleaning the valves or possibly from fixing some unknown issue beforehand but i have a lot of logs from beforehand showing no pre-existing issues at all. So i'm going to stick with what i said before that this valve made a noticeable improvement. No placebo effect involved. I call things how they are.

Are you serious ??

That's like even more stupid than installing a valve you don't know how or what it does...

So yeah, you are using an aftermarket HPFP running 90 bar of rail pressure in the high torque/fuel demand area, AND also using RS4 injectors....oh i forgot...that's with a....Garrett.....oh sorry a K04 ?? LOL

Oh i'm pretty sure you saw a HUUUGE difference with the RS4 valve...NOOOOT....

Definitely placebo effect.