Gearbox Oddities

[brasiliangringo]

Not sure if covered in the early post but links below from a chap who has repaired two of these boxes with good write ups.

Thread here re S8 :

http://www.motorgeek.com/viewtopic.p...46685&start=50

And RS6 C5 (same box) diff problem here :

http://forum.rs246.com/viewtopic.php?f=2&t=104077

[ulfilias]

Hi there,

Thanks brasiliangringo - There is a load of information there. I'm having a good read through the PDFs and working out quite what does what

[Goran]

Is your old S8 gearbox in working order? You have its TCU, you could just swap them both into your new car?

[ulfilias]

Goran,

I love the "JUST" in that sentance. Yeah. I do....it's a ECX vs a BFG iirc and the controler is a BL vs a DG. From what i've seen / worked out the FL cars gearbox controller (DG) won't work with the PF ECU, however the PF gearbox controller (BL) should be fine with the FL gearbox as the only thing it interfaces with is the valve body and they certainly do work.....I'm not sure of the exact 'upgrades' ZF have made between them but they so far seem minor on the valve body.

I do wonder if there is any difference in mechanical interfaces as the FL has the 40v engine and the PF the 32v.

I must admit it's the lack of ramp access that is making me retisent in swapping gearboxes....It certainly doesn't seem an easy job!

Lee

[brasiliangringo]

Out of interest, did those donor ECUs with different P/Ns actually work without throwing the 'ECU incorrectly coded' error message in VCDS as normally thats what you get when you swap different number ECUs in - ie they tend not to work.

[ulfilias]

brasiliangringo - Nope. The DG one from the FL car threw an error, hence I got a BL from a8parts. Irritating as i'm sure it's just the software in the box. I'm guessing you have to pair the gearbox TCU and the engines ECU or they have a hissy fit as reading the docs they swap information.


Interestingly i just tried removing the TCU completely as the Docs mention a second form or LIMP HOME that has nothing in the PRND432 window. The car starts and will go into reverse and move, but I have the same lack of forwards It was expected I guess.

Shame that with VCDS etc you can't pro-actively test things. For example set the solenoids or force a gear!

[ulfilias]

BTW - Just found http://lubricants.org/index.php?rout...earch=%2071141

£100 for 12l and £140 for 20L of Mobil ATF LT 71141

[Goran]

Hi Lee, yes, "just" was a bit optimistic having see the posts about the removal process. Also I completely forgot your new car is PF, my mistake.
If I recall some quattroworld posts, PF has a 10-blot pattern compared to FL 8-bolt pattern?

[ulfilias]

"If I recall some quattroworld posts, PF has a 10-blot pattern compared to FL 8-bolt pattern? "

What quite does that mean ??? I'd certainly like to verify and get my head round it before potentially getting mechanical!

Ta,
Lee

[ainarssems]

As far as I know manual 01E gearbox can be mounted to both PF and FL so the automatic swap from PF to FL should be possible as well. I think 10/8 bolts are for torque plate/flywheel. So there might be issues coupling torque plate and torque converter. Maybe somebody from A8parts can comment.