need ur help
 

I have studied at a mechanical high school,and now i syudy fot mechanical engineering.
.I need a help from u .
i need to know from urs knowledge about my audi transmission.the problem are too much but the story is this:
i have an AUDI A8 D2 4200cc quattro.In this transmission the tronic gear change doesent work and the mechanical told me this s an electrical problem,this is the first.
The seccond is :
I need to make a "supercar" using my AUDI engine and all other systems on a tube chassis made by me.I need to know from u if i can use this transmission removing the torsen differential and using only the front weels output.the engine will be placed in the middle of the car.
please give me an answer im waiting for your help.

Mid engine rear wheel drive using front driveshaft output to drive rear wheels?

You can lock centre diff by welding it up or use a gearbox from front wheel drive car or transaxle from Porsche or similar.

ythank you i dont belive it is functioning with welding .bust be some thing more special.anyway thankyou

It'll work welded up. this is how you get your MK2 estort and Vauxhall Chavette to have LSD diff with out spending money on a LSD diff.

Thats' not LSD it's NSD( as in no slip diff )

sorry can u tell me wht is LSD dhe NSD?

ainarssems my transmission is not manual it is automatic tronic .if
i weld center differential can it work wif front wheels?

So you want to convert the car to mid engine with rear wheel drive.

Fit a gearbox from a front wheel drive car, I'd recommend the 2.5 V6 tdi gearbox as the ratios would be most suitable for the V8 engines torque.

Centre of gravity
 

I think it really depends on where you want your centre of gravity to balance the engine/gearbox and rear diff...

The engine/gearbox balance each other at the rear lift points...so if you have the engine slightly forward to balance the rear diff you could connect to te rear diff using the rear output shaft of the gearbox and ignore the front output shafts...

Automatic Transmission Tronic Quattro
If i block REAR OUTPUT i use FRONT OUTPUT of the TRANSMISSION
i WILL USE THIS TRANSMISSION FOR MY SUPER CAR BUT I DONT KNOW HOW USE IT REMOVING REAT OUTPUT.
CAN ANYONE TELL ME IN DETAILS? THNX

The answer is above - weld together centre diff.

anyone who can help me for me transmission

Elvis I am doing the same type project, you're supposed to move the engine to the rear without turning it around. This way it is rear wheel drive not front.
Replace the transmission with a fwd trans, mainly because the awd will be too long and welding the torsen supposedly would make the trans too weak as said by many people.
These mid engine cars are not normally driving the front wheels so I wouldn't even try that it seems like a lot of extra work.
I'm interested in your build if you plan to use the a8, I'm trying to use this engine also.

Hi Guys, is there any particular reason you guys have chosen the Audi unit? Just thinking would it not be easier to use another engine from a FWD car seeing that you don’t want 4x4 maybe something like an Alfa for donor, rip engine and gearbox out in one go and plonk it on the back. Lovely free revving Alfa lump will sing at 7k.

Just a thought.

For me I was told it would be a good idea to use it since it bolts right up to most audi transmissions and usually people use audi trannies for these builds. I was going to use an 01e but then I decided I wanted an auto so I can replicate egear and paddle shifters.
Another reason is that I found an 00 audi a8 4.2 in excellent condition for only $1100 not a scratch on it. The only thing wrong with it is something with the transmission it will only work in reverse. I haven't investigated the problem yet.

On top of that I love the sound, I definitely can't have my car sounding like a muscle car.
Alfas are rare where I am, I've never even seen one in person.

i have seen a lot of supercars that have used the audi engine and gearbox.the reasson that i use the audi is that i have an audi a8 4.2 and the second is that i like audi it is in my spirit

Tallon - It's usually that it won't select reverse that's the failure on these. (Not to say that the fault is as you describe).

If it is, it's the 'F' seal that's gone but it's a full gearbox strip and rebuild to fix, though there is a thread here on it. If you're near Chicago, then there's a man there known as Tozo on some of the forums who can fix these with his eyes shut :)

Thats explained that, no body wants Alfa's here as they tent to rot around the engine and gearbox untill you're just left with an engine and gearbox.

+++ Good luck to you both and i'm looking forward to following the builds. Please add photos too.

Dezzy i think alfa romeo is interesant i ve seen a V6 sengine but i think it is too littleand not powerfull.Audi is great and very nice durable and simple in build.if u can halp me plz find me any materials for using my quattro transmission for my middle engeine supercar,and i lle do my cam and if it is too slowly bcz i like to use tronic gears to the steering weel like a supercar.i will modify it .

there is a men who has build a pagani using a jaguar w12 engine and a manual gearbox from an Audi A4 .it is intersting ,and it is going very well

do u have any other idea ainarssems excepr welding?

Well welding would be cheapest and simplest option and you can use the gearbox and ECU that you have. Possible issues is length of gearbox and possible balancing issue on diff after welding.

I suppose you could keep automatic part of gearbox, take off centre diff part and you might be able to find a FWD final drive that fits, possibly from 3.7 or 2.8 FWD car that fits. Or make custom drive from gearbox output to front diff. Unfortunately I cannot recommend any specific, I am afraid you need to do your own research. I length is not issue just weld it up maybe take centre diff to dynamic balancing after welding.

i have a 4.2 engine .if i take off the torsen the rpm from engine will go in front output and no in torsen ?how does function quattro ?from engine to torsen and next at the weels ?can anyoine explain this?

found anything about transmission?how can we use quattro trans for and fit for fwd transmission

On 4WD you have centre diff(torsen in most cases) at the end of gearbox and you have output from it to rear propshaft and a shaft going to front diff. On FWD you just have pair of gears that drive shaft going to front diff in place of centre diff. Iknow there are 4WD and RWD version of HP24 but do not know if there was ever FWD HP24 box, id there was you could use parts from it on your gearbox. On the other hand it could be possible to use parts from FWD HP19 box but I am not sure if they will fit.

Here I got a picture of boxes. On the left you have 4WD boxes and on the right FWD boxes. The automatic gearbox part should be the very similar(marked green in picture) but on 4WD boxes there is a transfer box bolted at the end of it marked in red and cover with pair of gears(yellow) on FWD cars. Like I said before I do not know if there was ever FWD version of HP24, If there was you could take transfer box off and get cover , gears and shaft and cover from FWD version, if not then you might be able to use parts from FWD HP19 but I cannot guarantee this without having both boxes and comparing parts. Or yo could make custom parts. But like #i said before if length of gearbox is not issue easiest and most cost effective solution would be to weld up center diff in transfer box.

http://forum.a8parts.co.uk/attachmen...1&d=1345997519

ainarssems thankyou for the help u give to me
maybe syncro s8 another member of forrum can halp me about this
do u understand wht i am going to do?
i need use my 4wd automatic transmission but imust eleminate the rear output and let the ission with front output and then i put the engine and gerabox in the middle of the chassis.but i dont know how to realise this with my gearbox and not with other gearbox.maybe one possibility is to remove the torse or middle differential,this is wht i think.this s why im goinge to ask all u

no one has any idea plz find anything
it is very important for me

Elvis,

If you dont want to use a FWD transmission then you can weld up the center diff so that the output to front and rear is identical. Try googeling it. Link here.

This has been discussed before but in some cases there is issue with 4WD box length. On 5HP19 you can just take transfer box off the end and use shafts, gears and end cap from FWD 5HP19 but there was never FWD 5HP24 or 4HP24. It might be possible to use parts from 5 HP19 but I am not sure.

This is the audi I bought, almost a shame to tear it apart

He does not want gearbox facing to the front. He wants gearbox to be behind engine ant to use front wheel output to drive rear wheels just like you. He just want to modify existing gearbox instead of buying another one. And 5HP19 is meant for lower torque then 5HP24, well his is probably 4HP24 being car from 1995.

Conan_the_Librarian
i want to use my quattro automatic transmission but i must use only the front output.the output i must take off and close the end of gearbox.
do u understand me?

@: tallon
i am using my trans in my v8 engine .the engine will be in the middle of the car and the front output of gear box will drive the rear weels of the car.the rear output wwill be token away.
is this wht are u doing?
if this is the same tell me how u did this

up is mycar audi a8 v8 4,2 quattro and down is wwht im going to do using the same engione and automatic transmission but modifying from quattro to front output from rear weels,

Doesn't matter, using the 5hp24 in this way will make it probably weaker than the 19. Welding the diff on any AWD normally damages it because the torque only driving the front of the trans. Not made for that.
I have a 24 too but not gonna attempt to use it.

Just went on ebay and spent the extra couple hundred for the 2.8 FWD so I wouldn't have to modify anything but yeah basically same thing, elvis. I also saw someone do this on a porsche boxter on different forum, same setup. He already had a 5hp19.

I am wondering what mid engine car you're doing, I'm building a murcie lp640

how much does 3.8 fwd coast?
i cant bye it bcz noone can post it to me
tell me where is any seller for 3.8 fwd transmission

http://www.ebay.de/itm/Audi-A8-3-7-D...ht_4476wt_1462
http://www.ebay.de/itm/AUDI-A8-3-7-A...8#ht_770wt_973

But you will also need matching TCU and change coding for 4 wheel drive so that engine, gearbox and ABS are all coded for 4WD otherwise they will complain about incorrect coding.

@: ainarssems
wht is TCU

Transmission control unit or gearbox ECU if you like