RS4 Injectors with K04?

[jmanseb7]

Currently building my K04 set up. Does anyone run RS4 injectors with their K04? I have a set and am wondering if they are worth installing or if I should sell them and try to find S3 injectors. I know the RS4's flow more, but is it too much? Or will the tune still work for these.

Also can someone explain what the RS4 LPFP controller does better over the stock A4 one?

Thank you in advance!

[A4 Quattro Joe]

Currently building my K04 set up. Does anyone run RS4 injectors with their K04? I have a set and am wondering if they are worth installing or if I should sell them and try to find S3 injectors. I know the RS4's flow more, but is it too much? Or will the tune still work for these.

Also can someone explain what the RS4 LPFP controller does better over the stock A4 one?

Thank you in advance!

I was wondering the same, I heard the pattern flows less on the rs4 than the S3. But be good to hear if someone is running them with no problem...

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[Andrew149]

S3 injectors are the correct flow pattern for the 2.0t and flows plenty for fuel.


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[vce1232000]

RS4 injectors have incorrect spray pattern for the 2.0T FSI. It has a cold start problems 1st thing am. Some tuners have claimed a . But none that Ive . Some on says no issue. Better just to the S3. No issue's @ all

The B7 RS4 LPFP controller lowers the duty cycle %. So it doesnt throw into limp mode when you wot . I had to 1 so it prevented going into limp mode and triggering the cel

[canadianA4B7]

Currently building my K04 set up. Does anyone run RS4 injectors with their K04? I have a set and am wondering if they are worth installing or if I should sell them and try to find S3 injectors. I know the RS4's flow more, but is it too much? Or will the tune still work for these.

Also can someone explain what the RS4 LPFP controller does better over the stock A4 one?

Thank you in advance!

A few are using the rs4 units still tuning will make the biggest difference. And fuel will also aid with them. S3 injectors will work fine. I’ve ran S3 on k04 and larger turbos. I’ve also got a set of the new revision RS4 units prepped to go in for use but again tuning will become my issue.

Rs4 lpfp will allow better control or allow higher amounts of fuel at a lesser duty cycle (not sure if I word this correctly). Highly suggest this upgrade with any turbo upgrades. If you cannot find one call torqbyte and order their PM3 or CM5. Few rs4 units on eBay recently I believe the revision B is preferred in most A4.

[Jake@JHM]

We've flow tested both S3 and B7 RS4 injectors. RS4 injectors only flow 1-2% more fuel than the S3 injectors do. That in our opinion makes the B7 RS4 Injector not a reasonable option for the B7-A4 due to issues the RS4 injectors bring up on the A4 platform.

S3's the way to go: https://jhmotorsports.com/injectors-...lf-r-2498.html

[jmanseb7]

A few are using the rs4 units still tuning will make the biggest difference. And fuel will also aid with them. S3 injectors will work fine. I’ve ran S3 on k04 and larger turbos. I’ve also got a set of the new revision RS4 units prepped to go in for use but again tuning will become my issue.

Rs4 lpfp will allow better control or allow higher amounts of fuel at a lesser duty cycle (not sure if I word this correctly). Highly suggest this upgrade with any turbo upgrades. If you cannot find one call torqbyte and order their PM3 or CM5. Few rs4 units on eBay recently I believe the revision B is preferred in most A4.

RS4 injectors have incorrect spray pattern for the 2.0T FSI. It has a cold start problems 1st thing am. Some tuners have claimed a . But none that Ive . Some on says no issue. Better just to the S3. No issue's @ all

The B7 RS4 LPFP controller lowers the duty cycle %. So it doesnt throw into limp mode when you wot . I had to 1 so it prevented going into limp mode and triggering the cel

We've flow tested both S3 and B7 RS4 injectors. RS4 injectors only flow 1-2% more fuel than the S3 injectors do. That in our opinion makes the B7 RS4 Injector not a reasonable option for the B7-A4 due to issues the RS4 injectors bring up on the A4 platform.

S3's the way to go: https://jhmotorsports.com/injectors-...lf-r-2498.html

Thank you all for the info! Didnt buy the RS4 injectors because i thought they would be "better" Just found them for a steal so i scooped them. Jake, thank you for the link! I work at an Audi dealership in NJ, so ill source those here, but i'll probably be going with you guys for the tune! Ill keep you updated when that time comes.

Thanks again!

[Jake@JHM]

Thank you all for the info! Didnt buy the RS4 injectors because i thought they would be "better" Just found them for a steal so i scooped them. Jake, thank you for the link! I work at an Audi dealership in NJ, so ill source those here, but i'll probably be going with you guys for the tune! Ill keep you updated when that time comes.

Thanks again!

Sounds good

[vce1232000]

but i'll probably be going with you guys for the tune! Ill keep you updated when that time comes.

Pm'ed you

[Charles.waite]

In general use the injectors the tun is built around. Especially on FSI motors, you'll have issues if you don't. But yea, what Jake (and others) said. S3 ones are the proper ones for the 2.0t, RS4s work, but they have issues.

[A4 Quattro Joe]

Sounds good

Weren't you guys selling a controller or in the midst of making a controller?

Been looking for rs4 no luck yet but heard great things on pm3....

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[Jake@JHM]

Weren't you guys selling a controller or in the midst of making a controller?

Been looking for rs4 no luck yet but heard great things on pm3....

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We are in the process of it yea

we can get you an RS4 controller if you want one.

[A4 Quattro Joe]

We are in the process of it yea

we can get you an RS4 controller if you want one.

How much?

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[Jake@JHM]

How much?

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I don't know off the top of my head. Shoot an email over to [email protected] and the sales guys can get you set up. Audi keeps upping the price on them.

[canadianA4B7]

How much?

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Can try Jim Ellis audi dealership last quote I got from them was $270/unit this was brought down using a garage requesting. Mine just sold on eBay for $355. But they are now made in china. So I’m guessing there’s a retailer in china which is selling them. I don’t really understand how they can move production to china then drive up the price, just boggles the brains. Ensil here in Canada is interested in making these but I sold my new unit rather then shipping it in for R&D.

[A4 Quattro Joe]

Can try Jim Ellis audi dealership last quote I got from them was $270/unit this was brought down using a garage requesting. Mine just sold on eBay for $355. But they are now made in china. So I’m guessing there’s a retailer in china which is selling them. I don’t really understand how they can move production to china then drive up the price, just boggles the brains. Ensil here in Canada is interested in making these but I sold my new unit rather then shipping it in for R&D.

Yup I bought yours on eBay rn lol!!

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[EvolutionArmory]

Can try Jim Ellis audi dealership last quote I got from them was $270/unit this was brought down using a garage requesting. Mine just sold on eBay for $355. But they are now made in china. So I’m guessing there’s a retailer in china which is selling them. I don’t really understand how they can move production to china then drive up the price, just boggles the brains. Ensil here in Canada is interested in making these but I sold my new unit rather then shipping it in for R&D.

Weren’t you the guy who was complaining about JHM selling these for $300 bucks or was that someone else?

[StatusQuo]

Here is my formula.

K04 on pump gas = S3 Injectors + OTS tune

K04 with a E30 mix (25% e85) = S3 injectors + 155bar PRV + Custom Tune

KO4 on E85 or Mix = RS4 injectors + Custom tune

RS4 injectors will hurt cold starts. More e85 in the tank, the worse the cold start will be.

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[A4 Quattro Joe]

Can try Jim Ellis audi dealership last quote I got from them was $270/unit this was brought down using a garage requesting. Mine just sold on eBay for $355. But they are now made in china. So I’m guessing there’s a retailer in china which is selling them. I don’t really understand how they can move production to china then drive up the price, just boggles the brains. Ensil here in Canada is interested in making these but I sold my new unit rather then shipping it in for R&D.

Do I need to get re tuned to have this work or plug and play? Also how hard is this task to change?

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[vce1232000]

Do I need to get re tuned to have this work or plug and play? Also how hard is this task to change?

No re-tune needed. Pure plug & play . To replace unit takes about 10 minutes. Very simple

[A4 Quattro Joe]

No re-tune needed. Pure plug & play . To replace unit takes about 10 minutes. Very simple

Thank you can't wait to try this out!

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[jbain2]

Before going on a search for the RS4 controller find out if you really need it.

I have a GT28 turbo setup (which certainly moves more air than a K04) and I run without the RS4 controller without any issues. S3 injectors.

Talk with whoever is going to do your tuning.

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[A4 Quattro Joe]

Before going on a search for the RS4 controller find out if you really need it.

I have a GT28 turbo setup (which certainly moves more air than a K04) and I run without the RS4 controller without any issues. S3 injectors.

Talk with whoever is going to do your tuning.

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I am bigger than a K04 so probably need it?

JHM TD50h-R they don't have anything provided for extra fueling for this kit other than S3 injectors...

IMO after speaking to a bunch of K04 people that benefit from them I think I should as well until I put something bigger then idk what would help..

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[Jake@JHM]

I am bigger than a K04 so probably need it?

JHM TD50h-R they don't have anything provided for extra fueling for this kit other than S3 injectors...

IMO after speaking to a bunch of K04 people that benefit from them I think I should as well until I put something bigger then idk what would help..

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Our HPFP upgrade and RS4 rail valve is required for TD05H-R

[jbain2]

I am bigger than a K04 so probably need it?

JHM TD50h-R they don't have anything provided for extra fueling for this kit other than S3 injectors...

IMO after speaking to a bunch of K04 people that benefit from them I think I should as well until I put something bigger then idk what would help..

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Run the hardware that JHM specifies. If they don’t say you need the RS4 LPFP controller, you don’t need it.

My point was that I am running a GT28 turbo using the stock controller and LPFP pump. S3 injectors and a 145 bar fuel rail valve.

Maybe my tuner was a magician!


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[A4 Quattro Joe]

Run the hardware that JHM specifies. If they don’t say you need the RS4 LPFP controller, you don’t need it.

My point was that I am running a GT28 turbo using the stock controller and LPFP pump. S3 injectors and a 145 bar fuel rail valve.

Maybe my tuner was a magician!


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It's runs without it just as a K04 from APR runs without them or No?

It just helps your fueling so your not overloading your lpfp which your prob maxing out up high.

With RS4 lpfp controller u save life on your lpfp so imo to ea his own. I don't wanna spend money on another LPFP

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[vce1232000]

It's runs without it just as a K04 from APR runs without them or No?

It just helps your fueling so your not overloading your lpfp which your prob maxing out up high.

With RS4 lpfp controller u save life on your lpfp so imo to ea his own. I don't wanna spend money on another LPFP[/URL]

Im APR KO4 & tuned. My stock lpfp controller was overloading for some reason & throwing a cel & going into limp mode . @ the time I also had a new lpfp thinking that was the issue. It continued to do so after the . So I vcds some logs. Then I seen the issue was the duty cycle was to high when going wot . a RS4 control module & problem ed.

[Okedokey]

Im APR KO4 & tuned. My stock lpfp controller was overloading for some reason & throwing a cel & going into limp mode . @ the time I also had a new lpfp thinking that was the issue. It continued to do so after the . So I vcds some logs. Then I seen the issue was the duty cycle was to high when going wot . a RS4 control module & problem ed.

Exactly the same for me with a K03 tune (2+).

[A4 Quattro Joe]

Our HPFP upgrade and RS4 rail valve is required for TD05H-R

Yeah it all came with kit right? Rs4 fuel valve


Have a APR HPFP

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[Jake@JHM]

Yeah it all came with kit right? Rs4 fuel valve


Have a APR HPFP

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If you ordered the kit form us and you selected the correct drop-down options then yea

[canadianA4B7]

Heres your explanation why some lpfp controllers are not capable of fueling. Doesn’t seem like many companies/tuners (apr/unitronic) are doing these sort of testing but the clever folks at torqbyte have proven what others seem to overlook. I will need to find the exact part number from my oem controller but they believe the part number will be effected with the same results.


This is the unit which was proven to max at 65% (over he phone they explained this was 63% on testing, rounded up when emailed)

[texasboy21]

Torqbyte CM5/Eurodyne BMP seems to be a solid way to go

....based on my super noob research on the B7 BT fueling options.

[EvolutionArmory]

If the S3 or Golf R unit is a viable option, why isn’t everyone jumping on that instead of trying to find harder to get RS4 modules? Are the connectors and wiring different?

[Okedokey]

Heres your explanation why some lpfp controllers are not capable of fueling. Doesn’t seem like many companies are doing these sort of testing but the clever folks at torqbyte have proven what others seem to overlook. I will need to find the exact part number from my oem controller but they believe the part number will be effected with the same results.

Can you please clarify which controller is capping out at 65%?

[canadianA4B7]

See above thread I was looking for photo to post.

I cannot get my hands on the diagrams for the golf R, ttrs, S3 or some of the others which look to be similar wiring pins. Some drawings would be helpful. But based on current hp ratings of newer models I would assume (which usually results in me looking like an ass) that a bit of wiring could result in more lpfp control. I’ve also never thought of what the b7 S4 cars are using.

[Charles.waite]

B7S4 use the old 4.2 with port injection so no HPFP and no LPFP controller.

[EvolutionArmory]

The MK7 Golf R controller is only 130 bucks. Anybody wanna try one? :)

[Okedokey]

See above thread I was looking for photo to post.

I cannot get my hands on the diagrams for the golf R, ttrs, S3 or some of the others which look to be similar wiring pins. Some drawings would be helpful. But based on current hp ratings of newer models I would assume (which usually results in me looking like an ass) that a bit of wiring could result in more lpfp control. I’ve also never thought of what the b7 S4 cars are using.

Right, so what we're saying is the stock A4 controller is 30% underated compared to an RS4 controller? Speak clearly man!

[canadianA4B7]

Tested my oem lpfp controller was only reaching 65% duty cycle max. The oem controllers should reach 92% duty cycle. These were compared between oem A4 LPFP controllers. This testing did not include the RS4 lpfp controller.

I do not know the exact measurements used for this test. My best guess is they’re rated for x duty cycle at Y current. The rs4 produces more X at lower Y.

This helpful at all?

[canadianA4B7]

The MK7 Golf R controller is only 130 bucks. Anybody wanna try one? :)

I would confirm wiring before plugging this in. I have seen a few instances where Audi has switched or reversed + and - terminals between model years.