Gearboxes

5.0 V10 50v biturbo - 571 bhp
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VaudiGR
3rd Gear
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Joined: Mon Aug 01, 2005 6:20 pm

Gearboxes

Post by VaudiGR » Fri Oct 22, 2021 1:01 pm

Hi chaps
My saloon has the LLJ gearbox. I want to buy a second hand as a spare/possible upgrade and I can find KZQ and MKT types only.

Are these the same and interchangeable ?

Also would they be able to be coded in the car and work without problems? Would I need anything else?

Thanks

welwynnick
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Re: Gearboxes

Post by welwynnick » Fri Oct 22, 2021 1:35 pm

You're asking the right questions, and I'm afraid I don't know the answers, but I was in a similar situation before.

The TCU is programmed to each car. What I did was swap the transmission control unit over to the new gearbox, and that worked fine.

Of course all the adaptation settings go out the window, and you have to start again, but that's OK if you have VCDS.

Do you have an immediate problem? If in doubt, change the oil and filter and replace the oil seals to the valve block.

Nick

VaudiGR
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Re: Gearboxes

Post by VaudiGR » Fri Oct 22, 2021 1:57 pm

No immediate problem just thinking ahead now that some spares are a decent price. I have VCDS, but what does adaptation entail?

welwynnick
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Re: Gearboxes

Post by welwynnick » Fri Oct 22, 2021 3:50 pm

Whether you have a torque convertor or a dual clutch gearbox, automatics change gear by opening one clutch (or brake) and closing another one, and they have to be synchronised to make them smooth. The transmission control unit monitors lots of parameters including the rate of change of engine speed and adjusts the actuation to synchronise the process. This adaptation accommodates tolerances and wear, and keeps changes smooth over time, without needing periodic adjustment. When you change the clutches etc, you have to start from square one with default parameters, and the changes will suffer from snatch or flare to begin with. The TCU will adapt these out automatically, but you can probably use VCDS to re-set to default values, which may be quicker.

Nick

VaudiGR
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Re: Gearboxes

Post by VaudiGR » Sun Oct 24, 2021 7:21 pm

Is there any indication as to the gearbox differences between the different codes? Do we know which is an early version and which a later version?

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Phuketpaul
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Re: Gearboxes

Post by Phuketpaul » Mon Oct 25, 2021 8:47 am

I'm fairly certain that MKT was the later version,as I have an MKT in my 2010 plus
2010 RS6 plus Avant, MRC Stage 2 747bhp 1059Nm
2008 Aston Martin DBS Volante
2001 Discovery 2

VaudiGR
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Re: Gearboxes

Post by VaudiGR » Mon Oct 25, 2021 9:36 am

That's good to know.
Thanks

ATinOf
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Re: Gearboxes

Post by ATinOf » Mon Nov 01, 2021 1:46 pm

Worth noting...click this link
ATinOf wrote:
Sun Nov 01, 2020 10:21 am

RS6-T28RPH
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Re: Gearboxes

Post by RS6-T28RPH » Tue Dec 21, 2021 6:37 pm

my rebuild is nearly done, will have a spare gearbox probably sometime in Jan, will find out which one it is as its currently on the deck at RE Performance thinking about what its done :-)
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2015 BMW X6 M50d (wife-transport, not allowed to touch :cry: )
2008 RS6 Avant Phantom Black - MRC Stage2 (ecu, tcu & 2nd cat bypass) 730 PS/1017 nm
2006 BMW 535d Pre-LCI - Stage 1 (340bhp)
2003 VW Polo 1.4Tdi (3pot shitbox) tuning project, was 73bhp, now 120bhp, aiming for 160bhp before it goes bang! (put in the bin)

Brufo93
Neutral
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Re: Gearboxes

Post by Brufo93 » Thu Feb 17, 2022 8:30 pm

Hi guys brand new to this forum I have a issue with my gear changes when I select reverse all the transmission lights stay illuminated and then can’t change gears manually with the paddles until I turn the car off and on again. I also get a jolt between 3-4 gear very now and again. I have changed fluid and filter had Vagcom do a diagnostic and there seems to be a solenoid error. Just wondering if the solenoids can be changed separately without changing the whole unit.

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