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Join Date: Oct 2007
Location: Idaho
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Hard shifting when tranny hot

I was thinking of installing the wevo shifter in my trans this winter but I'm not sure if will solve my problem. I don't like the rubbery feel of the stock shifter but I really don't like the way it is hard to get into first and sometimes second when the tranny is hot. If it works fine when cold I'm not sure a wevo will fix the hot shifting problem. It probably won't.

So why does this happen? Does the swepco oil get thicker when hot like a multi-weight oil?
Old 01-18-2010, 07:36 PM
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You may want to check your clutch adjustment. It could be as your car warms up the clearance on your clutch throw out is reducing and you are not fully disengaged when shifting.

Are you getting any grinding or just takes more force to shift?
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1988 930 coupe - Silver Metallic
3.3L w/GT35R, B&B Headers, RarlyL8 muffler, TurboKraft IC, Tial WG, tecGT based phased sequential EFI & ignition, Wevo shifter/coupler, ...
Old 01-19-2010, 03:34 PM
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Does the car try to move when it's hot and you try to shift into first? If so, then the adjustment could be out. Otherwise the synchros are glazed and most likely toast.
Old 01-19-2010, 06:14 PM
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It does not grind and it doesn't move when it goes in. I don't try to force it however I just move it back into 2 and try again a few times.

The cable was replace about a year ago so I adjusted it a couple of times since then because it was stretching.

Would the synchos be affected by heat? Just trying to understand.
Old 01-19-2010, 07:04 PM
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ok like any oil as it gets hot its viscosity gets smaller or it thins out. Probably your synchros are worn and the thick oil when its cold gives them enuff friction to engage the gear. When warm and the oil thins, the synchros no longer work as well since the friction they develop to match gear speeds is reduced.
thats it in a nutshell.
But if it makes you feel better this first gear engagement issue seems like a common problem among 930 4 speed boxes. I saw a post awhile back with a consensus on this issue. Unfortunately, 1st gear synchro gets beat pretty well through use, Porshce even used a different synchro design on 1st gear than the other remaining synchros to try to fix this.
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---"When you're racing it's life! Anything else either before or after, is just waiting"
Old 01-20-2010, 07:00 AM
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Ok that make a lot of sense so thanks for that.

I was thinking of running synthetic oil in there instead of the swepco but from your explanation I'm not sure if it would help. It would get less thin I assume but it would be slicker so it might make the problem worse.

Has anyone tried a synthetic oil in the transaxle to see if it would help?
Old 01-20-2010, 07:10 AM
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it's funny as I have to go through a whole procedure on 1st for smooth engagement:, double clutch, into second, quick throttle blip and smooth into 1st! Doing that at a track day makes it really interesting when your adrenaline is pumping and heel/toe downshifting!
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Old 01-20-2010, 02:33 PM
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you're on a good train of thought. because the synchros actually need a little bit of friction to work properly while oil in the tranny is there to lube the gears and bearings, sort of the opposite of friction when you think about it. I am simplifying it, but a level of friction in the oil is beneficial. I think Swepco 201 is the stuff to use and rebuilding the synchro is probably the right solution. when you get sick of it enuff then rebuild the tranny and consider regearing it lower while your in there.
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1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, B&B intercooler, Snow Perf water/meth injection, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.7bar max
---"When you're racing it's life! Anything else either before or after, is just waiting"
Old 01-20-2010, 03:39 PM
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Go here for some more information on hard shifting into first gear. Especially read the cause outlined in the tech bulletin. Pretty common it would seem.
First gear selection problem - help!
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Old 01-20-2010, 04:57 PM
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Thanks for the help guys.

If I wanted to change the final ratio, where did you guys get the gears?
Old 01-22-2010, 06:56 PM
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