3B to AAN ECU, what is needed?

[Jonas_R]

So I am doing the conversion of using a AAN ECU with my 3B.

I got the ECU, I know which pins to move in the 55 ECU connector.

I got the coils, but do I need any new sensor, such as Knock, cam position etc? I cant seem to find any info on this.

Also if the AAN ECU have a 3 bar bosch mapsensor, can I use RS2 software for it until I get it remapped?

My car has RS2 spec, only thing I dont have is IM and RS2 cams.

Cheers

Jonas

[UrS4boy]

I have to ask, why? A 3B has a distributor and one coil. An AAN has a cam position sensor (Hall sender) and 2 three channel Power Output Stages and five coils, a G62 coolant temp sender, knock sensors, etc. Are you going to add these or ???.

Have a look at this list of AAN inputs:

http://forums.audiworld.com/s4s6/msgs/150216.phtml

Have a look at this AAN engine bay device map:

http://forums.audiworld.com/s4s6/msgs/222453.phtml (and all the links beneath the map)

and this AAN T55 pin-out:

http://forums.audiworld.com/s4s6/msgs/149829.phtml

Note: A stock 3B ECU has a 2.0 Bar Manifold Absolute Pressure (MAP) sensor (transducer). A stock AAN ECU has a 2.5 Bar MAP sensor. A 3.0 Bar is an upgrade that allows an AAN to make more hp. e.g. MTM Stage 1 (2.5 bar) = 270 hp; Stage 1+ (3.0 Bar) = 280 hp. An RS2 ECU has a 3.0 bar MAP in it. Here is some info about the MAP sensor:

http://forums.audiworld.com/s4s6/msgs/140335.phtml

I am not saying it can't be done, just that you need to know what you are getting into.

[saltinot]

Hey Jonas,

How was your trip? I got my parts. Thanks!

Joe (aka AudiCoupeParts) is currently converting his 3B coupe to the ABY setup. He and I have been swapping notes for the last couple of months. Joe is a supe nice guy and I'm sure he would be happy to help you out. Give him a shout via PM.

Talk to you soon.

[Jonas_R]

UrS4boy:

I know what a mapsensor is ,I just wanted to know if it is possible to use RS2 boost and AFR epprom in the AAN ECU. The simple reason for this is that my tuner lives 200 km away in a different country and I dont want to drive all the way down to him on stock AAN map. My guess would be that the car would run like **** with RS2 injectors and a 4 bar FPR.

U ask why?
Well I want to run multi coil setup and that is not possible on 3B ECU, the main reason for this is the power level I'm aiming at and the fact I want better timing control and I want to avoid spark hop in the dizzy.

Finally found the thread I was looking for, it says that you could use the dizzy as a hall sensor, that was what I wanted to confirm.
Linky

Also the 3B already have a G62 MFTS, so that is not a problem.
The 3B already have knock sensors, and acording to the link above I can use the 3B ones, so guess that is ok as well.

I'm using the 034motorsport High output coil kit and according to them I don't need to use the POS with there kit.

[Jonas_R]

Tom:

Yeah my trip was great, however I did not like Vegas that much, it is way to hot for me And also the humidity was very high.

Think I will send Joe a PM, just to be sure, but I do believe that have all the parts that I need. However still unsure about the RS2 software and if it will function without problems in a AAN ECU as long as it has the 3 bar mapsensor.

[S2central.net]

@Jonas -

All sensors from 3B are usable on the conversion. The pinout tweaks are crucial...

The lower half of the 3B dissy can be used as the source for the camshaft position (hall effect) G40 - it will run off your 3B inlet cam as normal. There is a cap you can get for the dissy to replace the HT plugs. The early AANs ran like that.

You would need the modify the 3B head for a mounting point to accomodate the ABY/ADU style CMP position - under cam sprocket. OThers have done it - not worth it for you unless the head is coming off.

Your will of course need RS2 injectors instead of 3B ones... You will also need the 4bar FPR from the 7A engine - drop in replacement for 3bar FPR on the 3B engine without any other fuel tweaks.

Hope you have an uprated fuel pump already on and an RS2 EM of course.

You'll need an RS2 or 7A EX cam to get suitably high lift for extra hot-side oomf into the RS2 turbo.

I can modify an AAN or ABY ECU for you to run with 3bar MAP and such for RS2 software - I'll PM you back about that.

[Jonas_R]

Paul:

Already running the following and car is mapped for 350 BHP.
RS2 MAF
RS2 Injectors
RS2 EM
RS2 IC
RS2 bearings
RS2 Turbo
044 motorsport fuel pump
7A FPR

I dont want to use the RS2 software for anything else then driving up to my tuner Can this be done without the RS2 / 7A exhaust cam, cause I dont want to the head apart

[S2central.net]

IMO - no point in mapping it without RS2 or 7A EX CAM - it is much higher lift than 3B/AAN/ABY EX...

[S2central.net]

Cams can be changed without removing the head of course - its some top down surgery and timing belt off/on but nothing messy or complex...

[Jonas_R]

Yeah but I dont have the cams And I'm not planning installing any right know. But can I use stock RS2 software without the cam?

[terrybullwon]

Why not weld a hall sensor mount onto your 3B head? I done one on mine. The loom swap can be a bit of a pita as its very tight in places!

[S2central.net]

Well you could - but why bother - source the cam 1st I say...

[Jonas_R]

Well why bother with welding stuff on, if you can use the dizzy? I dont know how to weld, so that is more money out of my pocket. And that is money I dont have right know.

Anyways Paul can the RS2 standard software be used without the rs2 ex cam?

[UrS4boy]

...
Also the 3B already have a G62 MFTS, so that is not a problem...

...I'm using the 034motorsport High output coil kit and according to them I don't need to use the POS with there kit.

The G62 temp sensor is NOT the Multifunction Temp Switch. Two different things. The 3B ECU needs the MFTS whereas with the AAN, the MFTS is only used to drive the water temp gauge. The AAN's ECU water temp signal comes from the G62 temp sensor at the back of the head, as discussed here:

http://forums.audiworld.com/s4s6/msgs/148742.phtml

And yes, 034's "high output" coil-near-plugs have built-in power output stages (POSs) in the same way that the 1.8t coil packs have built-in POSs.

I am still not clear whether your AAN ECU already has a 3.0 Bar MAP or still the OE 2.5 Bar MAP.

Good luck with your project.

[Jonas_R]

I have a 3 bar map sensor lying around which I will install in the AAN ECU that I have, then if it is possible run standard RS2 software on it down to my tuner.

My 3B has both the MFTS and another temp sensor with two wires which I believe will be G62. Both are located under the IM, so dont think that is a problem.


Cheers

Jonas