| View previous topic :: View next topic |
| Author |
Message |
prophead
Joined: 12 Jul 2016
Posts: 32
Location: Falkirk, Scotland
|
 Posted: Fri Sep 09, 2016 1:04 am Post subject: Torque tube and Transaxle upgrade |
 |
|
I have been deliberating this for a while but have decided that it would be best to upgrade from the 2.0 na 20m drive line to the 25mm of the 924s/944. This is for 2 reasons 1. it will mean I can fit a more appropriate clutch setup for the V8 2. its more robust so I will not be worrying about snapping something everytime I put my foot down.
I've read through a bunch of the upgrade posts but am still not clear if I need to replace the 1/2 shafts?
Current setup 2.0 N/A 20mm torque tube and 5speed audi transaxle. Proposed will be 25mm torque tube + early 944 5speed Audi transaxle.
_________________
924 GT "8 Ball" track car project
944 Lux rolling project, nearly done |
|
| Back to top |
|
 |
Kenodog
Joined: 25 Jun 2003
Posts: 2669
Location: Vancouver,B.C.
|
| Posted: Fri Sep 09, 2016 4:11 am Post subject: |
|
|
I beleive early 944 Audi shaft was 20mm....
Me
_________________
1979 Euro 931, Olive
1981 931, Sabine
1991 Ford Ranger XLT 4x4, Ricky
1996 Ford E-350 ex-FedEx Van
2014 Mazda CX-5 (Kinderwagon)
2019 KTM 790 Adventure
2024 KLX300
2024 KLX140 |
|
| Back to top |
|
|
prophead
Joined: 12 Jul 2016
Posts: 32
Location: Falkirk, Scotland
|
| Posted: Fri Sep 09, 2016 5:48 am Post subject: |
|
|
| Kenodog wrote: | I beleive early 944 Audi shaft was 20mm....
The 924S and Early 944 moved to the 25mm torque tube shafts
Me |
_________________
924 GT "8 Ball" track car project
944 Lux rolling project, nearly done |
|
| Back to top |
|
|
Kenodog
Joined: 25 Jun 2003
Posts: 2669
Location: Vancouver,B.C.
|
| Posted: Fri Sep 09, 2016 6:13 am Post subject: |
|
|
Might be my old memory but I would look into that. Our S2 Audi boxes are the same as the early 944 boxes if I'm not mistaken and they are all 20mm. The 951 boxes were beefed up I know but not the early 944's...damn I gotta quit drinking.
Me
_________________
1979 Euro 931, Olive
1981 931, Sabine
1991 Ford Ranger XLT 4x4, Ricky
1996 Ford E-350 ex-FedEx Van
2014 Mazda CX-5 (Kinderwagon)
2019 KTM 790 Adventure
2024 KLX300
2024 KLX140 |
|
| Back to top |
|
|
nickthompson
Joined: 26 Mar 2013
Posts: 873
Location: Central Georgia
|
| Posted: Fri Sep 09, 2016 9:21 am Post subject: |
|
|
| I used an 84 944 transaxle for my 1.8t swap. It definitely has a larger input shafts than the 924. I didn't measure it but I assume it is 25mm. I used a 3.0 Ford clutch. |
|
| Back to top |
|
|
Noahs944
Joined: 08 Dec 2015
Posts: 782
Location: Calgary, Alberta, Canada
|
| Posted: Fri Sep 09, 2016 2:11 pm Post subject: |
|
|
| I *think* ALL 944 variants are 25mm TT |
|
| Back to top |
|
|
prophead
Joined: 12 Jul 2016
Posts: 32
Location: Falkirk, Scotland
|
| Posted: Fri Sep 09, 2016 7:32 pm Post subject: |
|
|
I'll find out definitively today as the replacement transaxle should turn up later on. In the meantime I have checked with a UK performance clutch manufacturer and according to their data only the 924 2.0 NA used the smaller 20mm shaft, everything else that is more powerful used the 25mm shaft (1").
As I am not changing the the torsion bar carrier or trailing arms I think my 1/2 shafts should be ok. Think they only need changed if going to the wider track alloy trailing arms. My concern was the PCD of the CV joint bolts, guess I will have the answer to that later on as well.
Will keep you posted.
_________________
924 GT "8 Ball" track car project
944 Lux rolling project, nearly done |
|
| Back to top |
|
|
Kenodog
Joined: 25 Jun 2003
Posts: 2669
Location: Vancouver,B.C.
|
| Posted: Fri Sep 09, 2016 10:59 pm Post subject: |
|
|
| prophead wrote: | | In the meantime I have checked with a UK performance clutch manufacturer and according to their data only the 924 2.0 NA used the smaller 20mm shaft, everything else that is more powerful used the 25mm shaft (1") |
That's why I am a bit confused. The 81-82 931's with the Audi box are all 20mm shafts. I have 3 of them and they are all the same. I assumed because this is the same box as the early 944 that they were 20mm too. Hmmm.
Me
_________________
1979 Euro 931, Olive
1981 931, Sabine
1991 Ford Ranger XLT 4x4, Ricky
1996 Ford E-350 ex-FedEx Van
2014 Mazda CX-5 (Kinderwagon)
2019 KTM 790 Adventure
2024 KLX300
2024 KLX140 |
|
| Back to top |
|
|
nickthompson
Joined: 26 Mar 2013
Posts: 873
Location: Central Georgia
|
| Posted: Fri Sep 09, 2016 11:10 pm Post subject: |
|
|
| Go measure again. The 931 has always used a 25mm shafts even the snail shell. The n/a has the smaller shaft. |
|
| Back to top |
|
|
nickthompson
Joined: 26 Mar 2013
Posts: 873
Location: Central Georgia
|
| Posted: Fri Sep 09, 2016 11:13 pm Post subject: |
|
|
Straight from the tech section
The 931 started out in 1980 with a snailshell type 5-speed, but with larger internal shafts to handle the extra power (see picture below). The torque tube also has a larger internal shaft, and the clutch diameter is larger, concurrently. The same reliability and repair issues for the 924 snailshell apply to this gearbox. In 1981, the 931 switched over to a 5-speed Audi-based trans, but with larger shafts again, as with the torque tube shaft. This transmission then was used in the 944, and then the 924S, with slight differences in gearing. Consequently, a 944 trans can be used in a 931 as a direct bolt-in |
|
| Back to top |
|
|
morghen
Joined: 21 Jan 2005
Posts: 9095
Location: Romania
|
| Posted: Fri Sep 09, 2016 11:25 pm Post subject: |
|
|
only the 924 NA had the 21mm spline, the 924 turbo, 924S and all the 944s had the same spline, 25mm if i'm not mistaken.
_________________
Supercharger and EFI kits
https://www.the924.com |
|
| Back to top |
|
|
Kenodog
Joined: 25 Jun 2003
Posts: 2669
Location: Vancouver,B.C.
|
| Posted: Sat Sep 10, 2016 12:23 am Post subject: |
|
|
That is my mind playing tricks. When I first pulled an Audi box I remember looking at it and think WTF the shaft is smaller than the G31's I have....
Wait a minute....
Me
_________________
1979 Euro 931, Olive
1981 931, Sabine
1991 Ford Ranger XLT 4x4, Ricky
1996 Ford E-350 ex-FedEx Van
2014 Mazda CX-5 (Kinderwagon)
2019 KTM 790 Adventure
2024 KLX300
2024 KLX140 |
|
| Back to top |
|
|
Kenodog
Joined: 25 Jun 2003
Posts: 2669
Location: Vancouver,B.C.
|
| Posted: Sat Sep 10, 2016 12:27 am Post subject: |
|
|
This is the page I was thinking about. It shows the 016 shaft which is smaller than the G31...
http://flussigmagazine.com/11/post/2013/12/g31-transaxles-016083-transaxles-and-01e-supplement.html
If you haven't read the article it is very informative from a comparison point of view.
Me
_________________
1979 Euro 931, Olive
1981 931, Sabine
1991 Ford Ranger XLT 4x4, Ricky
1996 Ford E-350 ex-FedEx Van
2014 Mazda CX-5 (Kinderwagon)
2019 KTM 790 Adventure
2024 KLX300
2024 KLX140 |
|
| Back to top |
|
|
prophead
Joined: 12 Jul 2016
Posts: 32
Location: Falkirk, Scotland
|
| Posted: Sat Sep 10, 2016 1:47 am Post subject: |
|
|
Replacement 944 transaxle arrived. It has 25mm shaft! and I do believe my 1/2 shafts will work. Externally the boxes are identical (apart from condition).
The pics are in my project thread.
http://www.924board.org/viewtopic.php?p=384065#384065
_________________
924 GT "8 Ball" track car project
944 Lux rolling project, nearly done |
|
| Back to top |
|
|
nickthompson
Joined: 26 Mar 2013
Posts: 873
Location: Central Georgia
|
| Posted: Sat Sep 10, 2016 1:54 am Post subject: |
|
|
Yes they are almost identical. There are small differences in the case I'm assuming from the way it was cast. Your stock CV axles will work, the linkage is the same the only difference is internal. |
|
| Back to top |
|
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
924 FAQ (Technical)
