I've been trying to find out what the ratios in each gear are in the gearbox that was fitted to the 1994-model Audi 80 TDi. Spent some time trawling the web with no joy. Contacted an Audi garage to be told to try this "erwin" website, which wants to charge me a minimum of £30 for the privilege of providing access to non-printable information. Can anybody provide this information for me please as I'm starting to feel like I've reached a dead end. What I'm looking for is the ratios in gears 1-5, and the final drive ratio.
As a follow on, does anyone know if the differential in these boxes can be turned upside down in order to mate it to a rear-mounted engine and still have five forward gears? (I'm asking cos I might try having one of these fitted to my trike). Cheers!
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andymc
Vroom, vroom - mmm, doughnuts ...
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The ratios depend on which gearbox is fitted. The code is 3 letters, e.g. 'CGU', and can be found on the vehicle data sticker, either on the inside front cover of the service schedule book, or stuck somewhere inside the boot, possibly behind the spare wheel.
Your gearbox may be one of the following, in order 1-5, final drive:
CGU: 39/11, 40/19, 40/28, 36/33, 32/36, 41/9
CVG: 35/10, 36/17, 40/28, 36/33, 32/36, 41/9
CVJ: 34/9, 37/17, 39/30, 31/37, 28/41, 41/9
CSX: 34/9, 37/17, 39/30, 31/37, 28/41, 41/9
CSY: 34/9, 37/17, 39/30, 31/37, 28/41, 41/9
CMR: 34/9, 37/17, 39/30, 31/37, 28/41, 41/9
CPK: 35/10, 36/17, 40/28, 36/33, 32/36, 41/9
If the gearbox you have is not listed, tell me the code & I'll see if I can find it.
As for turning the diff over, no idea, but I know the speedometer sender will stop working.
Ian.
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Thank you very much Ian, you're a gent. Haven't seen the gearbox myself, it's 60 miles away in a breaker's yard right now. However my trike mechanic lives nearby and is going to go and have a look at it either today or tomorrow, so I'll be able to pass this on to him. He wants to compare it with the Beetle box and see how much re-engineering will be needed to mount it to my existing engine and frame. I don't know yet whether this idea will work out or not, but if it does then a number of other trikers will be interested in trying the same thing. I may end up coming back to you begging for more information at some stage on their behalf!
Thanks for the tip about the speedo sender as well.
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andymc
Vroom, vroom - mmm, doughnuts ...
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Hi Ian,
Do you by any chance have any details for gearbox code CVC for a 1995 Audi 80 Tdi?
Also, do you know which of the above boxes you mentioned would fit the above car?
I'm trying to source and fit a gearbox for my friend's car while he is on his holiday you see ;) His 3rd gear synchro has gone and he cannot select that gear.
Many thanks in advance!
Paul
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>>does anyone know if the differential in these boxes can be turned upside down in order to mate it to a rear-mounted engine and still have five forward gears?
Andy, I'm not sure what you mean here. If you want to change the direction of rotation, you have to add another gear to the gear train. Such a gear is better closer to the engine side of the transmission, where it only needs to withstand engine torque, rather than engine torque multiplied by the gear ratio. Whatever you do, it sounds like serious engineering to me!
Number_Cruncher
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Vw(rear engine ) boxes could have the crown wheel moved from one side to the other as the pinion was on the centre line;these formed the basis of the original Hewland box and many similar.Mid engine-g/box at the back.
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To be honest NC I'm learning as I go along, it's all pretty theoretical to me. A few people including my trike mechanic have referred to options including turning the diff around as well as to turning it upside down. Some people have even talked about turning an entire gearbox upside down, although I still am not sure how this can be managed whilst ensuring that the gear oil provides lubrication where it's supposed to and doesn't leak out.
The most recent alternative box suggested to me is the gearbox from a Citroen GSA, which apparently can be made to fit a Beetle chassis without much difficulty. This entails the cutting and welding to one another of the Beetle driveshafts (at the wheel end) and the Citroen driveshafts (at the gearbox end), if you see what I mean.
No one said it would be easy ....
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andymc
Vroom, vroom - mmm, doughnuts ...
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Ah, sorry, I wasn't thinking of a crown wheel and pinion type of final drive - for some reason, I was thinking of a FWD type of helical gear pair. The idea of turning the diff over makes more sense now!
My first thought is that if you turn a hypoid crown wheel over, you will have to also move the axis of the output relative to the input - i.e., if originally the pinion was underslung, after turning the crown wheel, it would have to be overslung - or, you would have to fit a new crownwheel and pinion pair with the teeth cut accordingly. This is just my first thought, and I could be very wrong - I've never done this myself! Is it a hypoid pair, or spiral bevel?
Number_Cruncher
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Much as I love TDi's, I wouldn't want to be your neighbour when you start your trike from cold early one morning, the motor without all the metal and sound-damping materials that normally surround them..!
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Hehe - it ain't quiet, but certainly isn't as clattery as I had expected. The long exhaust pipes probably help to moderate the engine "note", such as it is. Having said that, as I accelerated away from the house one day, a neighbour's little kid clamped her hands over her ears as I went by! Must admit I derive a certain twisted satisfaction when in the company of various trikers & bikers, especially those who haven't seen my trike before, in starting it up and revving it. It's a sort of good-natured wind up of those who bring bikes to rallies on a trailer and then redline them while they're standing still. Yeah, very loud, well done. Now ride it mate!
Bizarrely, a couple of times I've started it up in front of bikers who haven't immediately realised it was a diesel, which really surprised me - I know Harley engines are sometimes described as tractor-like, but surely they can tell the difference.... ? (If only Growler was reading this).
To be honest, I think it sounds better (i.e. more like a large-engined bike) than most of the machines in the video clips on www.dieselbike.net/ - that may not be saying much though ...
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andymc
Vroom, vroom - mmm, doughnuts ...
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Would a gearbox from a diesel micro bus fit your exisiting set up?
COGBOX - 0208 842 2580 Specialises in aircooled VW gearboxes for road and drag racing and is run by Peter Engloiz (sp?)
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Just like Hewland in the old days;I remember seeing in kit car mags. a firm that supplied VW g/boxes not only reversed but with all the parts-clutches and bell-housings-to fit them to a range of non-VW motors.
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After all that, it turns out that the Audi box will require too much re-engineering to fit to my frame - the search goes on!!
Been looking on ebay at a couple of gearboxes out of the diesel T25 camper van - these may be workable ...
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andymc
Vroom, vroom - mmm, doughnuts ...
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