Project D2 S8 (FL) 01E Conversion.

[Goran]

Here are some A6 TDI gearbox ratios and final drives from ElsaWin.
Looks like gearboxes with codes DQT and FTF would be perfect for a manual conversion, 4.111 final drive, and a 0.56 6th gear already installed. 1st and 2nd gear look to be the same as a S8 DGV gearbox, so no lack of acceleration.

[SilverS8]

Could you still use flywheel and clutch from the S4 B5 with those gearboxes?

[Goran]

I'm not sure. I think Tozo in the States used a S4 flywheel, but then he used a S4 gearbox too.

http://forums.quattroworld.com/a8/msgs/12898.phtml

I'm no expert I'm just a parts collector

[Nollywood]

Originally Posted by Goran

I'm not sure. I think Tozo in the States used a S4 flywheel, but then he used a S4 gearbox too.

The S4 and S8 6-speed manuals are the same. The casings are both 01E, only the internal gear ratios differ.

I have one of each - S4 (DSY) S8 (DGV).

[Nollywood]

Originally Posted by SyncroS8

Interesting, I have been looking at TDI gearboxes with a view of using the whole gearbox... Any reason not to?

MG

The longer ratios in the TDI trans will not be favourable for the peaky nature of the S8 motor. You'll find yourself down shifting a lot to keep the high-revving AVP on cam.

The AVP won't make nearly enough low-down torque to make driving fun in dense traffic. The TDI trans would be better suited to an ABZ or 4,2 V8 40V (non S8). Or a turbocharged AVP.

[71camaro]

Don't suppose any of you xould source the OE left-hand drive pedal box/master cylinder?

[Goran]

Originally Posted by Nollywood

The longer ratios in the TDI trans will not be favourable for the peaky nature of the S8 motor. You'll find yourself down shifting a lot to keep the high-revving AVP on cam.

The AVP won't make nearly enough low-down torque to make driving fun in dense traffic. The TDI trans would be better suited to an ABZ or 4,2 V8 40V (non S8). Or a turbocharged AVP.

I have to disagree, have a look at the gear ratios of DGV vs FTF closely. 1st gear & 2nd gear are the same. 4th gear is the same.

Gear----DGV----FTF
1st------3.5----3.5
2nd-----1.889--1.889
3rd-----1.320---1.231
4th-----1.034---1.034
5th-----0.857---0.667
6th-----0.73----0.561

3rd gear I'll give you that one, at 30mph, 2000rpm for DGV vs 1865 for FTF, although its close.

5th gear debateable, at 50mph 2100rpm for DGV vs 1634rpm FTF, I think thats good, otherwise with the DGV you would always go into 6th for anything over 40mph. This way at least you get to use 5th in some cases, and give 6th a rest.
Anyway didnt you change your 5th to a TDI 5th?

6th gear FTF we all agree on I think, thats why everyone wants a 0.56 6th. No point in sitting at 3000rpm at 70mph.

Also, remember, you will be at least 70kg lighter and have less drivetrain lossess.

Considering you already have a 5th and 6th of more useful ratio installed, and that you have a chance of getting these TDI gearboxes from the UK (around £400) rather than waiting for a rare DGV from Germany for 1500 euros, I think its well worth it.

[Goran]

Originally Posted by 71camaro

Don't suppose any of you xould source the OE left-hand drive pedal box/master cylinder?

I'm convinced you dont need a different pedal box. Have a look at your auto LHD pedal box, I bet its got the casting for master cylinder and for mounting the over-centre spring. All you need is the bits themselves, master cylinder, slave cylinder, over-centre spring, etc. You can get these from a Audi dealer in the States. I do have 2 master cylinders but they are old, one is from a 1997 car I beleive, do you want to risk a 15 year old master cylinder, best to order a new one.
If you have a look at Tozo's thread in the pictures you can see his Auto pedal box has a mounting point for the master cylinder.

[71camaro]

Originally Posted by Goran

I'm convinced you dont need a different pedal box. Have a look at your auto LHD pedal box, I bet its got the casting for master cylinder and for mounting the over-centre spring. All you need is the bits themselves, master cylinder, slave cylinder, over-centre spring, etc. You can get these from a Audi dealer in the States. I do have 2 master cylinders but they are old, one is from a 1997 car I beleive, do you want to risk a 15 year old master cylinder, best to order a new one.
If you have a look at Tozo's thread in the pictures you can see his Auto pedal box has a mounting point for the master cylinder.

Any idea from what car the parts would be sourced? We got no manual 8s here, and Audi isn't keen on ordering Euro-spec parts to the States.

Also, this FTF code 01E, does the bellhousing match the 4.2, and if so, any idea if it was installed here in the US at all?

[Goran]

Audi in the UK were happy to order parts from Germany for LHD cars.
FTF is from a A6 2.5 TDI, although I think A4 TDI used the same box (or similar). I'm not sure if any diesels made it over to the States, I was under the impression they were not popular there.
Your best bet I think is to talk to Tozo or go over and see him, you have the expert over there who has done two of these already. Maybe your cheapest option will be a S4 box, I think Tozo used those in both of his conversions. He may even have advice about the clutch master cylinder, from the pictures I dont think he used a stock one.

If you want I can go to my local Audi dealer and find the prices for all the bits, clutch master cylinder, slave cylinder, over-centre spring, hydraulic hoses etc.
But Tozo may have cheaper solutions than brand new parts.