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Fasteddie313
Joined: 29 Sep 2013
Posts: 2595
Location: MI
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 Posted: Wed May 27, 2015 7:27 am Post subject: Experiment MKUltra... |
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I have the rear way up in the air eyeballing a shift bushing job + while I'm in there stuff..
As you all can probably tell by now my mind works in strange ways and I ended up measuring the torque it takes to slip the G31 LSD (to get the wheels move opposite) in 1st gear..
After a crows foot formula to rectify for the distance from the lugs to centerline of the axle (which didn't make much difference) It comes out to about 60 ft/lbs it takes to make it slip, or 65 ft/lbs on an outside lug inline with the tool.. Seems low?
I just thought it was an interesting thing to quantify about an interesting piece that I haven't seen done before...
I suppose it could be compared to others for wear and/or different oil characteristics and their effect on the clutches.. 70k miles and redline MT90 full synth here..
Sorry if I'm too out of the box for you guys, I don't mean to just fill the board with stupid crap but I get bored..
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Paul
Joined: 02 Nov 2002
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Location: Southeast Wisconsin
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| Posted: Wed May 27, 2015 9:43 am Post subject: |
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Wrong oil, too slippery?
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
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Owned and repaired 924s since 1977
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Fasteddie313
Joined: 29 Sep 2013
Posts: 2595
Location: MI
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| Posted: Wed May 27, 2015 10:14 am Post subject: |
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Maybe... It feels like nobody ever installed a 2nd gear synchro, no grind in 1st but I get like a block out where it won't go in sometimes and tricks me..
I got MT90 because many here recommended it.. Read some 911 guys say synth is too slippery and they prefer dino.. I have a bunch of cheap 75-90 napa dino on hand I could switch in and give a try...
You think I should give it a shot?
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Wed May 27, 2015 11:26 am Post subject: |
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MT90 requires use of a friction modifier for a clutch type LSD.
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- WeiBe (1987 924S 2.5t) - 931 S3
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Fasteddie313
Joined: 29 Sep 2013
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Location: MI
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Wed May 27, 2015 2:48 pm Post subject: |
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P.S. Per FSM, breakaway torque for G31 LSD is 25 to 43 ft lb.
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morghen
Joined: 21 Jan 2005
Posts: 9095
Location: Romania
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| Posted: Wed May 27, 2015 3:36 pm Post subject: |
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| Fasteddie313 wrote: | Maybe... It feels like nobody ever installed a 2nd gear synchro, no grind in 1st but I get like a block out where it won't go in sometimes and tricks me..
I got MT90 because many here recommended it.. Read some 911 guys say synth is too slippery and they prefer dino.. I have a bunch of cheap 75-90 napa dino on hand I could switch in and give a try...
You think I should give it a shot? |
I get the same with my 931 G31, sometimes it just wont go in first. No crunch, just its like the gear is locked and cant be engaged. I figured its either a clutch problem or a linkage problem.
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Fasteddie313
Joined: 29 Sep 2013
Posts: 2595
Location: MI
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| Posted: Wed May 27, 2015 4:21 pm Post subject: |
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| Rasta Monsta wrote: | | P.S. Per FSM, breakaway torque for G31 LSD is 25 to 43 ft lb. |
Wow, I'm not doing too bad then eh? Thanks for the good news!!! For once..
I really need to check the trans code one of these days to see if it has the lsd designation number or not..
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Fasteddie313
Joined: 29 Sep 2013
Posts: 2595
Location: MI
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| Posted: Wed May 27, 2015 4:26 pm Post subject: |
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| morghen wrote: |
I get the same with my 931 G31, sometimes it just wont go in first. No crunch, just its like the gear is locked and cant be engaged. I figured its either a clutch problem or a linkage problem. |
Check this sweet geeky synchronizer video out, I really like this one...
https://www.youtube.com/watch?v=MXsRfbOiBhE
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Cedric
Joined: 27 Aug 2004
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Location: Sweden
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| Posted: Wed May 27, 2015 4:57 pm Post subject: |
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| Fasteddie313 wrote: | | morghen wrote: |
I get the same with my 931 G31, sometimes it just wont go in first. No crunch, just its like the gear is locked and cant be engaged. I figured its either a clutch problem or a linkage problem. |
Check this sweet geeky synchronizer video out, I really like this one...
https://www.youtube.com/watch?v=MXsRfbOiBhE |
Strange, I have the same engaging first sometims. Though i have new syncros, dog ring, linkage bushings, hydraulic cylinders etc.
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morghen
Joined: 21 Jan 2005
Posts: 9095
Location: Romania
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| Posted: Wed May 27, 2015 6:34 pm Post subject: |
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Do you actually have the new gear hosing? So the brass coloured part?
Maybe those 3 locking keys are worn..
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Fasteddie313
Joined: 29 Sep 2013
Posts: 2595
Location: MI
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| Posted: Thu May 28, 2015 5:38 am Post subject: |
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3102 1674 /12
So its probably factory..
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