RS4 Fuel return valve

[CoNGLoMeRaTeGTi]

Quote, originally posted by Runin2Rich4FSi »

I swapped out my APR pump and went back to the stock one.

Willing to part with that APR LPFP?

If so, PM me.

[rracerguy717]

Quote, originally posted by Runin2Rich4FSi »

I swapped out my APR pump and went back to the stock one.

mmmm well I may swap this RS4 valve in when I check my cam follower and intake valves next time i have the manifold off just for future LPFP option it can't hurt IMO Bob.G

[staulkor]

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

[Runin2Rich4FSi]

sweet! tx staulkor

[LEWXCORE]

does anyone know what bar uni big turbo file runs?

[CoNGLoMeRaTeGTi]

Now that's a bargain. Make sure it's not the A version.

[CoNGLoMeRaTeGTi]

Low 120s

[Runin2Rich4FSi]

just ordered my new valve.

[ndifadvokit]

got one coming too. We'll see what happens. Not expecting big things but not expecting anything bad to come of it either. Worst case, i'll have another round of intake valve pics to post

[loudgli]

Does anyone see any reason to run this valve with software that only request 122 bar? My Giac request that and in 4th gear at 7200rpm it sometimes dips to 119.xx. Ive seen my low side pressure down to about 3.7 bar. Seems different people have different opinions about minimum low side fp.

[brekdown29]

sub'd

[LEWXCORE]

Quote, originally posted by loudgli »

Does anyone see any reason to run this valve with software that only request 122 bar? My Giac request that and in 4th gear at 7200rpm it sometimes dips to 119.xx. Ive seen my low side pressure down to about 3.7 bar. Seems different people have different opinions about minimum low side fp.

This

but more along the lines of a unitronic big turbo car on RS4 injectors that could use more fuel to run high boost at a nice AFR. If i upgraded the in-tank pump and added the RS4 valve i wonder how much more it would flow to the rs4 injectors.

[CoNGLoMeRaTeGTi]

Call me crazy for even thinking of a theory:

Arin informed me of this issue many many moons ago when I first got my APR HPFP. I thought there was something wrong with my HPFP. Anywho, it just so happens that the highest HP FSI was an APR tuned car. Riddle me this batman, could this be one of the so called "secret parts" that USP was using to yeild such high HP?

If so, prepare to see many many many more high HP dyno figures as this mod becomes
more popular.

I bet uni will custom tune to 135 bar shortly.

500whp on pump gas FSIs will soon be the norm.


Modified by CoNGLoMeRaTeGTi at 7:25 AM 3-26-2010

[Hendrik]

I don´t understand, why everybody is so surprised now...the topic was already discussed some months ago and just a few were intereseted

I hope for new injector testings due to flow rate and spray pattern of the rs4´s. Everybody remembers the picture from AWE tuning and first view lower flow rates of RS4 injectors compared to S3 ones.

Maybe also the black smoke problem can be solved or improved with our sperical dish design pistons and RS4 injectors under higher pressure!

...for my project, the FP Valve lays at home since november..

[chris@revotechnik]

Quote, originally posted by Hendrik »

I don´t understand, why everybody is so surprised now...the topic was already discussed some months ago and just a few were intereseted I hope for new injector testings due to flow rate and spray pattern of the rs4´s. Everybody remembers the picture from AWE tuning and first view lower flow rates of RS4 injectors compared to S3 ones. Maybe also the black smoke problem can be solved or improved with our sperical dish design pistons and RS4 injectors under higher pressure! ...for my project, the FP Valve lays at home since november..

The flow tests are not done at full pressure, they are done at only about 100psi if i recall correctly from speaking with the company who makes the machine.

[CoNGLoMeRaTeGTi]

Quote, originally posted by chris@revotechnik »

The flow tests are not done at full pressure, they are done at only about 100psi if i recall correctly from speaking with the company who makes the machine.

exactly.

So the flow/spray pattern @ 135bar (1958.00946psi) is completely different that those documents showing 100psi flow/spray pattern.

The stock valve on it's best day only provides 1885.49059 psi of pressure which most don't even get to see.

With the RS4 valve the minimum psi seen is the maximum of the stock GTi one.

[julito04]

From the looks of it, this is really only beneficial for BT cars, or at least vehicles equipped with anything but a K03. Is that right? Would this be a beneficial mod for someone running stage 2+ on stock K03? Excuse my noobness lol.

[CoNGLoMeRaTeGTi]

Quote, originally posted by julito04 »

From the looks of it, this is really only beneficial for BT cars, or at least vehicles equipped with anything but a K03. Is that right? Would this be a beneficial mod for someone running stage 2+ on stock K03? Excuse my noobness lol.

no. It's beneficial for anyone running a HPFP with the software requesting 127+ bar of fuel rail pressure.

I believe uni is the only tuner requesting under 127bar.

[Runin2Rich4FSi]

Quote, originally posted by julito04 »

From the looks of it, this is really only beneficial for BT cars, or at least vehicles equipped with anything but a K03. Is that right? Would this be a beneficial mod for someone running stage 2+ on stock K03? Excuse my noobness lol.

might not be the case.... towards the end of my cars stage2 life.. it appeared that my car was lacking a little bit of power... we never really looked into it so maybe I was hitting the valves max capacity even with stage 2. who knows... only way to find out is to test it yourself. Run logs ripping through 2nd 3rd, 4th, and 5th and see how low your values go for actual fuel pressure.

[ndifadvokit]

My new valve should arrive early next week. Any requests for before and after comparison logs? Tell me which blocks you want to see and under which kind of driving conditions.

[GolfRS]

Quote, originally posted by ndifadvokit »

My new valve should arrive early next week. Any requests for before and after comparison logs? Tell me which blocks you want to see and under which kind of driving conditions.

Hmmm, i'd like you to log intake temps and oil level while doing a 180 turn going backwards...

Yeah...that should do it !!!!

[Runin2Rich4FSi]

Quote, originally posted by ndifadvokit »

My new valve should arrive early next week. Any requests for before and after comparison logs? Tell me which blocks you want to see and under which kind of driving conditions.

goapr.com

then go to support and log what they consider round 1 and round 4.

[ndifadvokit]

Quote, originally posted by GolfRS »

Hmmm, i'd like you to log intake temps and oil level while doing a 180 turn going backwards... Yeah...that should do it !!!!

hmm, i think a video would better capture that moment

[rracerguy717]

Quote, originally posted by CoNGLoMeRaTeGTi »

s more popular. I bet uni will custom tune to 135 bar shortly.

Why stop there?

If im not mistaking the 1.4TSI twin charged thats used in Europe runs up to 150 bar .
So just as long as the pump can put it out and the fuel system can support it im sure the tuners can get more fueling out of those rs4 injectors and then will need the limiting valve from the 1.4TSI Bob.G

[crew219]

Quote, originally posted by rracerguy717 »

Why stop there? If im not mistaking the 1.4TSI twin charged thats used in Europe runs up to 150 bar . So just as long as the pump can put it out and the fuel system can support it im sure the tuners can get more fueling out of those rs4 injectors and then will need the limiting valve from the 1.4TSI Bob.G

IIRC the 2.0TSI also uses a 150bar limiting valve.

[rracerguy717]

Quote, originally posted by crew219 »

IIRC the 2.0TSI also uses a 150bar limiting valve.

Good too know Dave thanks

Is it a plug and play swap in the FSI fuel rail?

That would be nice !!!!! Bob.G

[Arin@APR]

150bar? May not be a good idea. Doesn't anyone remember this from back in the day?

[rracerguy717]

Quote, originally posted by Arin@APR »

150bar? May not be a good idea. Doesn't anyone remember this from back in the day?

Prob failed because the mechanical limits of the flat tappet follower setup in the FSI

It would have to follow basically how the HPFP system on the TSI engine with some type of roller follower IMO. Bob.G

[bokiNY]

Staulkor, did you use the part number mentioned earlier (079130757) on genuinevwaudiparts.com and under what Audi model did you search because I found only A6, Q5, R8 and S6. And somebody mentioned revision A - are there a couple of revisions and which one is the right one? Thanks.


Modified by bokiNY at 6:23 PM 3-29-2010

[LEWXCORE]

Quote, originally posted by Arin@APR »

150bar? May not be a good idea. Doesn't anyone remember this from back in the day?

well what fuel pump was he using and i wonder if his follower had alot of wear before he started that 150 bar stuff

[CoNGLoMeRaTeGTi]

Quote, originally posted by bokiNY »

Staulkor, did you use the part number mentioned earlier (079130757) on genuinevwaudiparts.com and under what Audi model did you search because I found only A6, Q5, R8 and S6. And somebody mentioned revision A - are there a couple of revisions and which one is the right one? Thanks. Modified by bokiNY at 11:41 AM 3-28-2010

I went to the Audi stealership prior to purchasing te correct valve online. The one you speak of is the A version meant for the models you speak of. The 079130757 is RS4 specific.

[bokiNY]

So how do we order one from genuinevwaudiparts.com if there's no RS4 option when searching and you can't search for 079130757?
Thanks

[JC@DouglasVW]

Quote, originally posted by crew219 »

IIRC the 2.0TSI also uses a 150bar limiting valve.

If i am not mistaken the limiting valve on a TSI does not screw into the fuel rail it is built internal to the hpfp.

[crew219]

Quote, originally posted by JC@DouglasVW »

If i am not mistaken the limiting valve on a TSI does not screw into the fuel rail it is built internal to the hpfp.

You're right . . . I just checked and the pump can produce a maximum of 150bar but the pressure limiting valve which is internal to the pump opens at 200 bar. Lol.

Dave

[CoNGLoMeRaTeGTi]

Google it.

It comes up on ecs site and worldimpex