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D3 - Transmission Gearboxes, diffs, drive shafts.

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  #21  
Old 12th April 2021, 04:13 AM
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mcs mcs is offline
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I just picked up the car from the gearbox place.

It is a totally different machine to drive. So smooth. Seriously smooth.

The rev hunting on the overrun has vanished. The gears downshifting are not noticeable as the car slows to a stop.

I was told the internal seals were incredibly worn, and this would cause many issues as the clutchpacks cannot get the correct fluid amounts due to internal leaking.

However, it is all done now. Recommend these parts are changed every 100,000 klms.

Mike
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  #22  
Old 12th April 2021, 05:14 PM
vajper vajper is offline
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Oh, that is SO interesting to hear! I'll try to do mine to in the weekend. Promise to post some pics.
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  #23  
Old 17th April 2021, 02:28 PM
vajper vajper is offline
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The Swedish postal service seems to have lost my spare parts so no work this weekend. Darn
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  #24  
Old 24th April 2021, 10:34 PM
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I've done about 750 klms in the car since the box was serviced now.

The service place was unable to reset the parameters for the gearbox learning, which I have heard of before in very early D3's. It should adapt itself in time in any case, which it seemingly has done.

The box is much smoother to run down the gears to first, and also engages the TC Clutch without any rev bounce on the overrun. Everything seems to be good.

Mike
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04 A8 - 4.2 Sport

Indigo Leather Sports Seats - Sports wheel - Sports Air Suspension
Auto Boot - Double Glazing - AMI - Solar roof
TV - Bose - Voice Control - TPMS - AFS- TINT
Power Blind, Fingerprint - Light package (in and out)

Retrofits:
OEM Auto headlights & rain sensing wipers
OEM Bluetooth phone
Bluetooth Audio Streaming
Reverse Camera
OEM Aluminium Package
Auto boot close using remote/door button
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  #25  
Old 5th May 2021, 09:16 AM
vajper vajper is offline
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Changed my bridge seal and the four rubber thingies this weekend. Reset the adaptation and ran through the initial recommended cycles from the SSP. After that, not that much driving.

So far it is behaving better but still I experience more TC slippage on 3rd gear than expected

It still seems like the shifts 2->3 and 3->4 is happening in "two steps". I get first one motor RPM and then another. Like there is a "middle gear". I don't think I have seen the TC ever closing on 3rd gear, even when really pushing the throttle to max. Guess this might be one of the clutches being worn out...

I've done what I can, will follow up the behavior closely the next coming months.
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  #26  
Old 22nd December 2021, 12:21 AM
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As an update, I sent my car back to have the fluid rechecked and reset the adaptations.

There is no mechanical fault with the car to cause the misbehaviour of shifts. I did further research and decided to replace the brake switch.

This car is now 100%. The 'box can coast, it doesn't lock and unlock the TC clutch, it has power off the line again. Shifts are also more concise somehow.

I took apart the brake switch, it is a two position switch and it seems it is possible for it to misread occasionally or stick confusing the gearbox ecu.

Just some information shared.

Mike
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04 A8 - 4.2 Sport

Indigo Leather Sports Seats - Sports wheel - Sports Air Suspension
Auto Boot - Double Glazing - AMI - Solar roof
TV - Bose - Voice Control - TPMS - AFS- TINT
Power Blind, Fingerprint - Light package (in and out)

Retrofits:
OEM Auto headlights & rain sensing wipers
OEM Bluetooth phone
Bluetooth Audio Streaming
Reverse Camera
OEM Aluminium Package
Auto boot close using remote/door button
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  #27  
Old 22nd December 2021, 08:52 AM
HPsauce HPsauce is offline
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Quote:
Originally Posted by mcs View Post
I took apart the brake switch, it is a two position switch and it seems it is possible for it to misread occasionally or stick confusing the gearbox ecu.
If it's the same switch as a D2 (and it probably is) there's lots of comments in various threads about how it can be slightly misadjusted or stick and cause all sorts of weirdness.

IIRC one circuit is primarily for ECU information and the other for the brake lights (you may see more wear/scarring on those contacts) and the ECU one triggers first as the pedal is pressed.

It's possible to have the ECU think the brakes are applied without the brake lights being on or any actual retardation from them, but things then happen that are confusing.
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  #28  
Old 22nd December 2021, 08:54 AM
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Quote:
Originally Posted by mcs View Post
I did further research and decided to replace the brake switch.

This car is now 100%. The 'box can coast, it doesn't lock and unlock the TC clutch, it has power off the line again. Shifts are also more concise somehow.

I took apart the brake switch, it is a two position switch and it seems it is possible for it to misread occasionally or stick confusing the gearbox ecu.
This sounds exactly like the issue several of us have had with the D2s. If interested, there is a very lengthy thread about it spanning several years, which all boils down to the brake switch. The link below is to a post I made, which quoted two other members posts (MikkiJayne and HPsauce), how you can check it and what to check for, although chances are the block number referenced is probably different on the D3:

http://forum.a8parts.co.uk/showpost....&postcount=247
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