Gear crunch
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Joined: May 2008
Posts: 66
Likes: 0
From: Dublin Ireland
Gear crunch
Hi all,
I have a c2s that I bought about a month ago (pics to follow). I cant believe how amazing this car is, both to drive and just look at. It has 107k miles with a huge folder of history. No leaks and runs nice and tight. The only thing I've noticed is that from cold when I change into second I get a slight crunch, if I change very slowly no crunch. This only happens from first to second.
Should I be worried?
I have a c2s that I bought about a month ago (pics to follow). I cant believe how amazing this car is, both to drive and just look at. It has 107k miles with a huge folder of history. No leaks and runs nice and tight. The only thing I've noticed is that from cold when I change into second I get a slight crunch, if I change very slowly no crunch. This only happens from first to second.
Should I be worried?
Racer
Joined: Aug 2006
Posts: 303
Likes: 14
From: Minneapolis
Mine does the same thing when cold. I just blip the throttle a little when shifting and it slips into 2 without any effort. When warm, there is no "crunching" on mine. I don't drag people off the stoplight so I don't worry about speedshifting. Tranny shifts real nice when you're smooth.
Racer
Joined: Oct 2007
Posts: 497
Likes: 0
From: Honolulu, HI
Mine does the same thing when cold. I just blip the throttle a little when shifting and it slips into 2 without any effort. When warm, there is no "crunching" on mine. I don't drag people off the stoplight so I don't worry about speedshifting. Tranny shifts real nice when you're smooth.
Racer
Joined: Jul 2007
Posts: 336
Likes: 1
From: Central Florida
I am sure we all have learned to give our 993's that pregnant pause between gears. Recently I had my transmission fluid changed and added Redline Redline 75W-90NS, which has no friction modifiers. The Redline instructions suggest adding a small amount of friction modifier but the installing garage suggest none be added. My transmission shifts "much" better now. Well worth the $.
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Drifting
Joined: Oct 2003
Posts: 2,058
Likes: 65
From: Brentwood, Tennessee
When I got my car 4 years ago and first experienced this problem, I remember someone posted something about saying "paycheck" in between double-clutching. It stayed with me! You should be fine in 5 to 10 minutes.
Rennlist Member
Joined: Nov 2005
Posts: 3,785
Likes: 673
From: Dahlonega, Georgia
"Double clutching" is a method used to match engine and transmission RPM on downshifts. Say you're in 4th gear at the upper end of the RPM scale for 4th and you are approaching a much slower 3rd gear turn. It goes like this:
1. 4th gear - Clutch in - Shifter to neutral
2. Clutch out in neutral - Rev engine to appropriate RPM
3. Clutch in - Shift to 3rd - Clutch out
When done properly and well, all of this takes place much faster than you can read this sentence.
If you ever at a track, standing at a turn that requires hard braking, you'll hear the drivers double clutch...As they go by slowing for the turn you'll hear that marvelous "Whoop-Daaah-Whoop-Daaah" as they work down through the gears.
Terry
1. 4th gear - Clutch in - Shifter to neutral
2. Clutch out in neutral - Rev engine to appropriate RPM
3. Clutch in - Shift to 3rd - Clutch out
When done properly and well, all of this takes place much faster than you can read this sentence.
If you ever at a track, standing at a turn that requires hard braking, you'll hear the drivers double clutch...As they go by slowing for the turn you'll hear that marvelous "Whoop-Daaah-Whoop-Daaah" as they work down through the gears.
Terry
Nordschleife Master
Joined: Aug 2004
Posts: 5,622
Likes: 17
From: Austin, Texas
I am about to purchase some Mobil Delvac for this exact reason... I get some crunching/notchiness into third gear.
Excuse the ignorance, but how much should I order? I.E. how much do our gearboxes hold? Yes I am being lazy, I know I could look it up in the manual
thanks
Excuse the ignorance, but how much should I order? I.E. how much do our gearboxes hold? Yes I am being lazy, I know I could look it up in the manual
thanks
Rennlist Member
Joined: Mar 2004
Posts: 1,326
Likes: 3
From: Chadds Ford, PA
mrsullivan: If you do a search on this topic you will find that many of us have tried a number of different trani fluids to try to improve shifting. As far as I can tell the Redline does the trick better than any other fluid. Good luck.
Drifting
Joined: Apr 2008
Posts: 2,650
Likes: 3
From: Calgary, Alberta
gear crunch
I used to use the double clutching up technique on my old '86 Subaru GL when it had sat overnight at - 20 C or colder. Works well. Sometimes I'd have to do it from second to third as well.
I've only had my 993 a few weeks, but I've noticed it likes "deliberate" shifts. I'm still working on getting 3 - 4 just right, but it's coming.
Rinty
I've only had my 993 a few weeks, but I've noticed it likes "deliberate" shifts. I'm still working on getting 3 - 4 just right, but it's coming.
Rinty