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#51
24th March 2017, 11:57 AM
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Actually, I suppose if you don't have all the factory parts to fit an 01E it makes no difference which gearbox you use. You have to fabricate mounts and shafts either way so you might as well use the more modern 0A3. The 01E is cheaper to buy, but by the time you've cured the 1/2 synchro weakness its about even with an 0A3, and the 0A3s will mostly have less miles I would expect. The lack of a speedo output is easily solved once you've figured out all the rest of the swap.
Hmm... The 0A3 I have has crazy high ratios: FD 3.889 1st 3.667 2nd 2.050 3rd 1.276 4th 0.882 5th 0.659 6th 0.528!! 4th in this is the same as 5th in the DGV. 70mph in 6th is 1800rpm  I've attached a spreadsheet I made with a gear speed calculator for the various common options which may help visualise some of this 
Last edited by MikkiJayne; 24th March 2017 at 12:04 PM. 
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#52
24th March 2017, 01:13 PM
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Nice spreadsheet
 I'm liking the low rpm at 70mph with your 0A3 Forgive my ignorance, does the rear diff have to match the final drive of the gearbox or are they all interchangeable? Are all D2 diffs the same? Luckily 3.889 rear diffs for D2 should be easily available. Last edited by Goran; 24th March 2017 at 01:24 PM.
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#53
24th March 2017, 03:16 PM
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Yes it does, otherwise the back wheels will try to turn at a different speed to the front ones and the Torsen will explode
 D2 and C5 diffs are the same so loads of options. The heatsink from the RS6 diff will even fit if we're getting ambitious 
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#55
24th March 2017, 03:48 PM
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Yeah basically. The gearbox output shaft drives the outer case of the Torsen. The inner gears of the Torsen then drive two outputs - one front, and one rear. The front output goes through a set of gears to shift it sideways and reverse its direction, and then it goes forward to drive the front diff inside the gearbox casing. The rear output goes straight out of the back and hooks up to the propshaft and rear diff. Because both front and rear diffs are being driven at the same speed they both have exactly the same ratios, abeit packaged slightly differently
This diagram shows the concept well. Its of a DSG unit, but the principle is the same for all Audi AWD (longitudinal) gearboxes (manual or auto). The Torsen is shown in red on the bottom right.  For completeness, the A3 and TT transverse setups are completely different. Oh, here is a rather odd mirror-image of the 5HP24A which shows it too: 
Last edited by MikkiJayne; 24th March 2017 at 03:56 PM.
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#56
24th March 2017, 04:23 PM
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Any clearer?
__________________
2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.). 2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation". (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one!  Finally: gone, but not forgotten..... 1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors. e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course. (internal dimming mirror added later)1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer. And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850! 
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#57
24th March 2017, 07:56 PM
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Thanks for that I'll look into it some more, especially the gearbox mounts,speedo, flywheel, clutch.
Dave
__________________
 2002 S8 silver with black half leather 2000 d2 S8 in Racing green pearl, RS4 manual gearbox, 2003 A4 avant TDi 1997 Volvo V40 2.0T 1992 Mazda eunos v spec 1976 Reliant Kitten 1965 Porsche 911
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#58
24th March 2017, 08:03 PM
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Ah yes I see now it makes sense. I knew the output shafts to front and rear had to be the same speed that's why I was confused, the reduction gear for the front driveshafts is in the front just behind the driveshaft flange (I didnt know that), so an equivalent reduction gear is in the rear diff.
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#59
25th March 2017, 06:18 PM
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Mikkijayne thank's for the gear chart i thought my car did around
45 1st 65 2nd 100 3rd 150 4th 186 5th and 3rd to 4th was to big a jump 50mph the biggest jump it didn't help that all the car data sites seem to have the wrong diff ratio. now I'm looking through the gear charts to see if a s4 or rs4 box would be the best for me thanks for your help Dave
__________________
2002 S8 silver with black half leather 2000 d2 S8 in Racing green pearl, RS4 manual gearbox, 2003 A4 avant TDi 1997 Volvo V40 2.0T 1992 Mazda eunos v spec 1976 Reliant Kitten 1965 Porsche 911
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#60
25th March 2017, 09:34 PM
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I just missed a DQT for sale, but same guy has an FST box he claims to be equal to the DQT. Anyone have any info on that?
__________________
2003 Daytona Grey RS6 2000 Silver S8 2005 A6 1.8TQ Premium 1993 Audi S4 2.2 TQ MTM 330 (my first love!)
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