Audi Coupe Quattro 7a --> 1z TDi swap questions

[M2ki]

No, you can't.

[etsola]

Well, it'd be the 5th from a DGW 01A from a 1996-1998 A4 TDI Quattro... Which 5th is 0.66... Very tall.

There's O1E 6 gears that the 6th is 0.56!

I'll calculate with stock 01A... But thanks I had notice it was taller on the Sedan but didn't think of making the calculations I think it'll Rev too high.

Do you know if I can swap the rear diff ring and pinion from a B4 into our B3 casing? There 3.89 instead of 4.11.

Thanks

[De80q]

Are you calculating that with the CQ 01A, or the sedan 01A? The sedan has a slightly taller 5th gear than the CQ.

[etsola]

Ha! Should've done that before!!

3.89 gives me 2600 rpm @ 75 mph with stock tire size and dgw 5th gear.

4.11 gives me 2750 rpm @ 75 mph with stock tire size and dgw 5th gear.

I won't bother then... A bit high, but hey... Still ok. I can try to source a longer 5th or use a 6th from an 01E maybe? Which is 0.56.

That'd be perfect if it can be done. Gives me 2340 with 4.11 final. Very decent!

Thanks

[etsola]

Ahh... Crap then.

I'll calculate with 4.11 diff what rpm it would give.

I can always put bigger tires

How about URQuattro diffs... Internals would fit?

[M2ki]

No. Tottaly different diffs.

[etsola]

Usually the ring and pinion can be fitted into the casing... No?

As the rear torsen for the V8 Quattro.

Thanks

[M2ki]

Yes.

But 3.888 suitable rear diff is only on the coupe. B4 diff wont fit.

[etsola]

Exactly !

But I was pointing that the final ratio for that engine was 3.89, which if I keep 4.11 will make it rev too high for a diesel and will defeat the purpose for good fuel economy. Though B4 quattros have had (with the 2.8) 3.89 ratios --> which I can transplant the ring and pinion in my diff. The the final gear of the transmission.

I was looking exactly at that :

I'd need the gears form an 01A DGW or EEP --> Anyone knows how much that'd be worth ? Shipped to Canada ?

And a b4 quattro Ring and Pinion. That I can source from over here I guess.

Just to be sure, I was under the impression that a the 01A casing was meant to mate both with 4 cyl and 5 cyl.

Let's say a 1z, or ALH or any other 1.9 Tdi, would it bolt to the transmission ?

Thanks

[M2ki]

I hear 4 cyl engine bolt right up to the 01a - and I have 4 spare 01a here that may go to the scrap yard. I hear there are diffs that have 3.89 ratios that is close enough to the original 02A one in the '97 Passat - that I could take the Ring and Pinion from and transplant into the CQ one.

Coupe Quattro 2.8 had 3.888.
You got something mixed up. 02A is transverse gearbox.
97 tdi passat synco 5 speed is 01A gearbox with code DGW and ratio 3.888

[etsola]

Thanks for the concerns and advice. Thgough I'm hard headed and found may Passat to me amazing in the snow. Again, the idea is not to have fun, but to have a DD that has a good MPG.

I always wanted to own an A4 1.9 Tdi, though those weren't sold in North America ... I was even pondering importing one ... Hence the idea to swap a Tdi in my CQ. Since I'm parting the 7a engine anyways and was basically parting out the car ... I figured I'd keep it and try this little project.

I hear 4 cyl engine bolt right up to the 01a - and I have 4 spare 01a here that may go to the scrap yard. I hear there are diffs that have 3.89 ratios that is close enough to the original 02A one in the '97 Passat - that I could take the Ring and Pinion from and transplant into the CQ one.

Main question right now, what was the transmission code for the 1z ? What were their gear ratios ?

Thanks

[K Simmonds]

i have to echo the advice given in the second comment, don't do it!

I have a good friend with a B5 quattro sporting the last incarnation pf the trusty 1Z engine which he purchased as a ragging wagon for when there's snow on the ground and he's most disappointed with it's performance when running it when there's snow . Even with the correct gearbox the power delivery simply is not suited for having fun in the snow, the surge of torque when the turbo spools up makes's it highly unpredictable compared to the more linear output from a naturally aspirated petrol engine. Not to mention the short power-band, which again is not suited for having fun on the white stuff.

The 7A is a great engine,though as I'm sure your aware is not light weight,meaning lots of under-steer in the snow, if I had to pick a cheap engine to fit for fun in the snow then I'd probably go for non turbo 1.8T, it's light weight, would suit the current gearing well and has a nice spread of power, okay not huge amount but enough to have plenty of fun in the snow..

[M2ki]

I had Passat TDI here (1996) and heating as well as fuel economy wasn't a problem.

It was geared properly. Probably also had somekind electric heater from factory and was not four wheel drive.

Here few B3 and B4 tdi quattros are for sale, and have been for more than 6 months, and nobody wants them, even in the winter, when everything else with quattro gets sold pretty quickly

You'll also need 1Z manual pedalbox with pedal sensor and all the other 4 cylinder stuff, radiator, fans, cross member, diesel engine mounts, fuel pump etc.
Also the engine must be from B4, B5, C4, C5 Audi or B5 Passat. You can't use engine from Golf or any other transverse mounted VAG engine.

I have done few engine swaps and wouldn't even consider doing this swap without donor car. You'll spend lots of money and time searching for diesel specifi stuff overthere if you want the engine bay to look like decent.

[etsola]

Thanks for the reply!

I had Passat TDI here (1996) and heating as well as fuel economy wasn't a problem.

I guess I'll have to think about it

Thanks for the info on where to search!

[M2ki]

Quattro, wrong gearing, weak old diesel and winter is not gonna be good on economy. Old diesels that take ages to warm up are not economical. You know that diesels sold here had electric radiators for winter, so that you could get cabin warm?
All the engines and parts are available here, but it is rarely done because the reasons mentioned.

You need to drive a LOT, to make this worth it.
If you want fuel economony over the 7A go for 1.8T, done million times, lots of know how, parts readily available and cheap.

Yes you can swap gears in the 01A, but where are you going to find suitable gears?

Haven't seen any S2 for sale here more than a couple of years now.


Few S2 are sale in Finland, not cheap.
https://www.nettiauto.com/en/audi/s2

Few S2 in Sweden.
https://www.blocket.se/sodermanland/...h&cg=1020&st=s

Main portal for used cars here.
https://eng.auto24.ee/main/mainindex.php

And for Lithuania.
https://en.autoplius.lt/