20V CQ Tidy Up

[Error404]

A few people have asked me about the speed sensor solution on the 0A3 gearbox. On the B6/B7 platform the VSS is taken from the ABS sensor, so there is no provision for a sensor on the gearbox like the 01E. The 01E speed sensor is a reed switch triggered off magnetic ring on the diff which earths a constant current signal from the speedo chip in the cluster, so the speedo chip sees a current pulse 8 times per wheel revolution.
I had a chat to Johne on the forum who was super helpful, and we decided to use a hall sensor with a pull-up resistor to generate the correct signal to feed the speedo chip. I needed a small spacer for the passenger side driveshaft, so this was perfect to incorporate a trigger for the hall sensor.
I just needed to add a 12v feed to the empty pin in the OEM speed sensor plug. Simples.

So I drew up the spacer and machined that, and then just needed to make up a little bracket for he hall sensor. Did some zinc/nickel plating with some help & advise from Eric (cheers mate )

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Bracket bolts to the heatshield bosses on the OA3 diff cover:

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One hole is slotted to allow for adjustment, so I can make the right air gap, 1mm works perfectly:

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I've done drawings for these bits too, so if anyone needs them in future....

[irishs2]

Awesome. That bracket does look very OEM and factory finish

[_ShurikeN]

You should have put some inscription like 895 XXX XXX on it. It would look good.

[TimE-J]

Fantastic work as always! It's amazing to see how many mod cons you've fitted and how well you've modernized it! I seriously can't wait to see this at ADI now.

[andy10v]

Nicely executed. The pivot to adjust the gap is brilliant, so simple and effective.

[Error404]

Thanks chaps

OK so my next new MFTS is now being a ****, reading just above 50 during cruise and wandering up to 110 degrees before the first fan is triggered
So I've now ordered a 3rd new one. Behr this time. This one better work. I'm getting ****ing bored of this now.

Oh and brand new Bosch ISVs leak like sieves!

[Thuppu]

Nice progress Alex! I'm speechless of the details...

How does the gearbox feel in that chassis?

[Error404]

Gearbox feels awesome Thomas, its totally changed the car
Gear shift is really smooth and light. Shorter ratios than the CGR box, feels modern

Edit : I forgot also to mention that I now have zero driveline shunt.
I only really realised today when Helen mentioned it, that it doesn't punch you in the back coming off the throttle. I've been so uised to the S4 which has none, i'd forgetten how the whole car would lurch about. So that is a really big improvement too

[Thuppu]

That sound good. Heh, Alex, you should take a ride in my UrS... it doesn't feel soo modern.

[Error404]

haha, yes but instead it is like hyperspace outside the windows

[Thuppu]

Yeah right.

[s2driveruk]

Am looking forward to seeing this at ADI, superb build thread this one and the attention to detail is OCD which all the best ones are

Am mighty jealous looking at how clean she looks.

Enjoy it

[Monkeymagic]

I'm gutted I can't make adi and see it!

[Fat Audi 80]

Yes, I agree David, I will be taking a close look too. No danger of my engine bay being shamed though, I am parking well away in the concours area!

[andy10v]

Gearbox feels awesome Thomas, its totally changed the car
Gear shift is really smooth and light. Shorter ratios than the CGR box, feels modern

Edit : I forgot also to mention that I now have zero driveline shunt.
I only really realised today when Helen mentioned it, that it doesn't punch you in the back coming off the throttle. I've been so uised to the S4 which has none, i'd forgetten how the whole car would lurch about. So that is a really big improvement too

That sounds really nice!

Same axles etc?