Audi R8 fuel pump control module upgrade

[AudiB720TS]

BACKGROUND:

Replacing the stock fuel pump control module helps reduce system stress by reducing duty cycle and should help to ensure adequate fueling for upgraded applications.
Using an Audi R8 control module is more affordable (50-100 USD for a second hand unit) and easier to implement than a third party unit.

More information and discussion can be found here.


TOOLS REQUIRED:

• Audi R8 fuel pump control module (4F1906093B)
• Allen key set
• Philips screwdriver
• Pry bar
• VCDS

INSTRUCTIONS:

1. Remove rear seat (just pull up and out, no tools required)
2. Remove cover of fuel pump on passenger side (philips screwdriver required)
3. Disconnect main (large) electrical connector on top of fuel pump to have more clearance
4. Undo two screws holding the fuel pump control module (allen key required)
5. Use a pry bar* to pull around edges of sheet metal to increase clearance to remove control module
6. Once removed, transfer clips for screws to RS4/R8 control module unit
7. Attach connector(s) and start car to test function (leaving control unit on the seating area)
8. Using VCDS perform fuel pump adaptation
9. To reinstall hold control module by electrical wire to position the unit under sheet metal to align with screw holes
10. Tighten screws on control unit
11. Put fuel pump cover back and tighten screws
12. Press back on sheet metal were it has been pulled
13. Put rear seat back

*Tape edges as not to damage underbody paint / rust protection.

[Jayz691]

Curious...i didn't have to do any adaptation or anything. Wondering what the reason behind this is? I was one that originally tested this, and just swapped em, and that was it.

Sent from my LM-G710VM using Audizine Forum mobile app

[BrokeBichB8]

Why did you guys choose the R8 FPCM and not the B8 S4 module? How did you know this would work? I am trying to actually upgrade my B8 S4 low pressure fuel system and have considered this but saw some guys say the r8 FPCM wont work with the same pins? Thanks

[BrokeBichB8]

BUMP for advice

[Jay-Bee]

Why did you guys choose the R8 FPCM and not the B8 S4 module? How did you know this would work? I am trying to actually upgrade my B8 S4 low pressure fuel system and have considered this but saw some guys say the r8 FPCM wont work with the same pins? Thanks

Maybe make your own post in the B8 section and not in a B7 DIY thread

[BrokeBichB8]

B7 a4 and b8 s4 have the same method of fuel pump control using a g410 and a FPCM to regulate the two wire in tank fuel pump. They are literally identical fuel control systems. This is the only place on Audizine a control module upgrade has been mentioned and it seems that there are more tuned A4s running out of fuel than s4s.

If you don’t know anything just keep scrolling. You waste more energy typing a useless response than scrolling by. This is appeal to the gents who have pushed the fuel controller limit and how they upgraded it. Thanks

[Jay-Bee]

The B8 module(which fits both B8/8.5 2.0T and 3.0T) obviously doesnt worl in a B7, and the RS4/R8 controller doesn't fit in a B8. What else you want to waste time with in a DIY thread? i'm here all day and I know lots.

Sure both cars have a G410 sensor and run a PWM signal to the pump, apart from that they don't cross, and use different ECU generations for control.

Make a post in the B8 section, i wasn't trying to piss you off , it's the logical way to seek advise, tons of people running high power 3.0T cars can fill you in on what they use.

Bosch 044 inline pump and you'll have more fuel than you'll ever be able to use, took me 5 minutes to figure out how to upgrade the low pressure fuel side on a B8

You have logs? running E85? Why do you think you need to install a fuel controller from an older generation car?

[BrokeBichB8]

Why don't the "older" controllers with identical plugs work? The "older" controllers still control the same style of fuel pump. Two wire, power modulated........

I would post in the B8 section but there are a lot of individuals there who buy off the shelf goods and when there is nothing off the shelf then the knowledge base stops. So I dug around audizine to see who has done such a thing, thus here I am. I have been asking around, as there's not one way to upgrade LPFP system, especially because I am trying to piggyback the oem system so I can keep the fuel pump bucket for daily situations.

You wasted five minutes because the bosch 044 wont retain the oem bucket functions and will likely burn out the stock controller even if it did fit.

Logs? yes. E85 mix? Yes. I think I need to DIY a fuel control upgrade which is what the title of this forum is, although earlier gen. If I had a brushless fuel pump this would be a waste of an inquiry I get it, but I don't. Its brushed.


So why wont the supercar FPCM (R8) work in my car?

[xRenesis]

Why not just shove one in there? Same doesn't mean same same. It could be how it communicates, pins, which pin does what, etc.

Looking at a B8 S4 basket, it looks like you could retain the basket with a new pump just like everyone does with the B7. Pop the pump out, drop a new one in, add new lines for the style of pump you pick. Running a Walbro 450 in my stock basket, working exactly as stock would.

[BrokeBichB8]

Why not just shove one in there? Same doesn't mean same same. It could be how it communicates, pins, which pin does what, etc.

Looking at a B8 S4 basket, it looks like you could retain the basket with a new pump just like everyone does with the B7. Pop the pump out, drop a new one in, add new lines for the style of pump you pick. Running a Walbro 450 in my stock basket, working exactly as stock would.

Lol I love you guys, forreal, like I'm trying to shove a square pin in a round hole. The pump controller still has 5 pins, 1.PUMP + 2. PUMP - 3. FPCM + 4. FPCM - 5. Signal. What I wonder is how the b7 communication signal is changed from b8. Because by having a g410 in the B7 it means it still must have scalable control. It cannot just be on off. How does the b7 FPCM communicate? Isnt it just a pwm the FPCM scales to fuel pump voltage?

The s4 basket lid has a little male barb to mate to a fuel pump that has a female hole with O-ring. The lid incorporates routing for dual siphon jets which fill the bucket and pull fuel from the rear of the tank. All walbros and aftermarket pumps just have male fittings, nothing to mate with what my bucket has. Additionally, Ive got a spare fuel sender on my desk and have been studying it but it is a very well designed bucket with no real way for modifications without ruining the siphon system, which plenty of b8 guys do and then cant run a tank lower than 1/2. I am hoping to either overdrive my oem pump with another audi controller possibly (again maybe the r8? or I have seen the Q7 3.0t has a much beefier FPCM shared with the r8 as well?), or if you guys know the method of one wire control, maybe piggyback another FPCM with my s4. true diy. Thanks for the help.

[xRenesis]

How do you think any of us retain the siphon with an aftermarket pump? Putting a tee in and plumbing correctly. Torqbyte also has a solution for the B8 S4. The reason you'll have issues in the B7 section is because, its the B7 section. We know the B7 and mods we've done and nothing/little on how the B8 is unless someone actually has one. If you have access to an R8 or RS4 controller, try it and report to the B8 group. Test resistances, etc.

It's like a C8 Corvette owner asking a C7 owner how to make their car better. May be same, may be different.

[BrokeBichB8]

This DIY was posted in 2021. My first question was how did they arrive at the (2008-2012) r8 module working and why would you pick that module 9 years later. the additional b8 info was just to help understand my goal. YEEEEESH just get over it I have a b8 and need help understanding how you guys decided on the r8 module vs any other module available by Audi.

I may very well add an aftermarket pump, but if I can just get enough out of the stock pump by upgrading the controller like the A4 guys do.....

If you truly understand the upgrade then spreading you knowledge about it can only help another, even if one is a newer car. I figured if someone here knew how the FPCM on the a4 works and how it communicated properly with the R8 module, they could explain that, and then I could apply it to what I've learned about the b8 FPCM and what I know.

[xRenesis]

https://www.audizine.com/forum/showt...highlight=fpcm just from one search. Likely someone had access, connector and pinout is same, tested and worked. That's all you're going to have to do if no one else has done it, someone has to be the first to dive in.

This particular DIY may be from 2021, but the original (RS4 controller we've used) is from 2013.

[BrokeBichB8]

Thanks for looking for me. But thats only more evidence of the point Im trying to make. The link you posted is for a updated version of the s4 which has a brushless fuel pump. That connector and pinout is different because it has a 6 pin connector and the fuel pump has 3 wires going to it. They swapped a brushless fuel pump from another car for their brushless pump. It wont work for my car because it has the older fuel control system like the b7 and b8 a4. The link is for a b8.5 with updates.

My car is older and has the same connector as your b7 A4. If you dont know anything in depth about the fuel pump or its controls just say so.

[Jay-Bee]

Run an inline pump to supplement the factory in tank, doesn't need a controller, i thought the 044 could be setup like that but there are others that can be.

The main reason would be that the Ea113 2.0T in B7 and the 4.2fsi in RS4 and R8 are all on Bosch MED9 ecu generation and use same/similar components for fuel delivery and monitoring, the 3.0T is Continental Simos 8, modules may look the same but will have different control protocols.

Honestly plug one in and see what it does, i'll retract and eat my wasted time. If it worked it would have likely been tested in the last 12 years. Just find it hard to believe you're the first person to run out of fuel on an E85 3.0T