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paluck
Joined: 25 Mar 2009
Posts: 69
Location: Walnut Creek, CA
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 Posted: Mon Jul 19, 2010 12:49 am Post subject: questions on torque tube and Master Cyl compatability |
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Hi - My friends and I have a 79 924 that we use for the 24 Hours of Lemons. We just procured a 1983 944 roller and swapped out the 4 lug for the 5 lug. Man these new brakes look sweet. Couple questions:
1) We also took the 944 booster / MC assembly and were intending to switch it out and reroute the brake lines for a Front/Rear split. Do we need to switch from the x-split? Looking in the archives, looks like some people have kept the x-split. Is the determining factor if the new MS has brake biasing on the 2 circuits?
2) We have a stock snailshell transmission.. Well - we have 2 of them.... well - we may have shredded one last race... we've been advised to take the 944 torque tube for the shifter mechanism to protect our transmission. Will a 944 Torque tube mate up with our 2 litre engine and the snailshell transmission? or should we just rehab our 924 shifter bushings?
-Mike
Rooster Juice Racing
p.s. - If you haven't seen our vid yet - check it out for amusement
http://www.youtube.com/watch?v=FC8kNNPNW38
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paluck(at)hotmail.com
1989 944 S2
1979 924 |
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joejax
Joined: 02 Dec 2009
Posts: 919
Location: Jacksonville,FLA,USA
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| Posted: Mon Jul 19, 2010 10:17 am Post subject: |
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Well, no tech advice for you, but Holy Crap! Those vids freakin rock! 
Keep on keepin' on, and PBR is the shiz!   
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I got nothin'
Uhhh...you got any pics? |
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Mon Jul 19, 2010 10:50 am Post subject: |
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No, the 944 stuff won't fit in the NA because the driveshaft for the 944 (and 924S and 931) is 25mm, while your NA has a 19mm driveshaft. You will need to find an Audi based transmission from a 1980-1982 924 NA, and you will need the gearbox, the mounts, the entire shift linkage (on the trans, the rod, and the lever in the cabin), and the torque tube. Then you will need to drop the rear torsion carrier to swap the torque tubes, and you will need to hack off the snailshell mounting arms from your torsion carrier before reinstalling. Not undoable, but obviously, not a trivial job either.
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erstwhile owner of just about every 924 variant ever made |
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Shurick
Joined: 15 May 2005
Posts: 524
Location: Russia, Moscow.
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| Posted: Mon Jul 19, 2010 12:21 pm Post subject: |
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You need to reroute your brakes for the 944 master cylinder, since have a stepped bore.
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WBR, Shurick
'79 931 -- intercooled K26-3060-6.10 turbo @ 1.2 bar, EFI+EDIS, 951S brakes, stripped interior, 951 look.
'86 924S -- R.I.P.
https://www.instagram.com/ru_pacecar/ |
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v8carreragts
Joined: 05 Sep 2003
Posts: 665
Location: Tucson, AZ
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| Posted: Mon Jul 19, 2010 12:22 pm Post subject: |
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You can use the 944 stuff. I had an 84 944 torque tube and transaxle in my last 79 924. You need a Mustang disc because the 944 shaft is larger. I put around 65000 miles on my 79 with this transaxle torque tube and Mustang disc. It also had a BAE turbo system on it.
The booster will also fit but the master cylinder cannot be used. The 944 master cylinder is stepped meaning that the bore in the back half is larger than the bore in the front half. However, you should be able to use your 924 master on the 944 booster. You will get a little more boost from the larger 944 booster. |
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paluck
Joined: 25 Mar 2009
Posts: 69
Location: Walnut Creek, CA
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| Posted: Tue Jul 20, 2010 3:45 pm Post subject: |
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ok - thanks everyone.
We're going to use the 944 MC and reroute the brake lines for fr/rear split.
we're going to keep the 924 transmission and torque tube. We just put in a new clutch and picked up a spare snailshell, so we'll continue to run that for now. Found online replacement bushings for the shifter, so we'll clean up the slop there. (Heard the rear shifter bushings are tricky to get at - anyone cut an access panel?)
Now I need to research something called a BAE turbo that I saw some posts on. That need any fuel system mods? We need some more JUICE in this race car !
-M
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paluck(at)hotmail.com
1989 944 S2
1979 924 |
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Tue Jul 20, 2010 8:02 pm Post subject: |
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| paluck wrote: | | Found online replacement bushings for the shifter, so we'll clean up the slop there. |
Hope you'll consider some of our offerings:
http://garage.ideola.com/prod-Trans.html
The brass bushings will last much longer than the OEM plastic, especially under race conditions...
924RACR cut an access panel on his race car, but advised me against doing it, as he found it difficult to seal afterward, and it doesn't really make things that much easier to deal with. You have to change your gearbox anyway, the shift rod is easy to deal with once the gearbox is out of the way. Easier to replace the bushings with the shift rod out; do the brass bushings, and you'll likely not have to deal with it again for a long time.
RE: the BAE turbo:
http://www.924board.org/viewtopic.php?t=29561
http://www.924board.org/viewtopic.php?t=17300
Good luck finding a usable unit, though, they're pretty rare these days, and don't function that well. If you really want to go turbo, you'd be better off finding one of the BAE log manifolds and bolting on a more modern turbo unit. The old turbos that came on those setups are asthmatic at best and nearly impossible to find rebuild parts for.
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erstwhile owner of just about every 924 variant ever made |
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v8carreragts
Joined: 05 Sep 2003
Posts: 665
Location: Tucson, AZ
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| Posted: Tue Jul 20, 2010 11:27 pm Post subject: |
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| The turbo used on the BAE system is basically the same as the one used on the old Chevy Corvair. You can use rebuild parts from that unit like the seals and gaskets. |
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paluck
Joined: 25 Mar 2009
Posts: 69
Location: Walnut Creek, CA
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| Posted: Wed Jul 21, 2010 5:19 am Post subject: |
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yes - ideola - your site is where I found those metal bushings - we'll order from there.
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paluck(at)hotmail.com
1989 944 S2
1979 924 |
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CorsePerVita
Joined: 25 Jul 2008
Posts: 1992
Location: Redmond, Oregon
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| Posted: Wed Jul 21, 2010 5:33 am Post subject: |
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Great video!
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- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS |
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paluck
Joined: 25 Mar 2009
Posts: 69
Location: Walnut Creek, CA
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| Posted: Thu Jul 22, 2010 2:07 pm Post subject: |
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in case anyone's interested - this is how the car looked at our last race
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paluck(at)hotmail.com
1989 944 S2
1979 924 |
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