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S Chassis Technical discussion related to the S Chassis such as the S12, S13, S14, and S15.


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Old 01-19-2012, 04:31 PM   #1
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Losing my mind! ( Vibrating )
PROBLEM:

On decel coasting to a stop sign in neutral I get this weird vibration around 1200RPM. It will only stop if, 1. Car stops, if the car is moving even barely it will continue. The second car completely stops the vibrating stops 2. Brakes are slightly applied (once released vibrating will begin again).

Feels like a side to side vibration.

Notes:

Car will still vibrate with car in 1st and clutch pushed in when coasting.

On start up and idle when stationary car does not vibrate. I tested this with the motor cold and warmed up and at 1200rpm.

When driving car does not vibrate. Even at 1200rpm.



Motor runs perfect, perfect compression. Motor mounts are good.


Any ideas?????
Last edited by SMM; 01-20-2012 at 01:00 PM..
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Old 01-19-2012, 05:34 PM   #2
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Still nothing.
Last edited by SMM; 01-19-2012 at 07:50 PM..
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Old 01-19-2012, 08:45 PM   #3
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how are your motor mounts
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Old 01-19-2012, 09:18 PM   #4
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Motor mounts look good. Slight rocking and I mean barely moving. Dont think its enough to cause this sort of shaking.
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Old 01-19-2012, 09:26 PM   #5
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wheel bearings, bad tires warped brake rotors?
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Old 01-19-2012, 09:29 PM   #6
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can u feel the brake pedal pulse while your applying the brakes? maybe warped rotors? how is your alignment?
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Old 01-19-2012, 09:43 PM   #7
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Rotors are brand new all the way around. Same goes for tires. Alignment is perfect.

Wheel bearing would cause it to feel like a bounce not a side to side shake.
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Old 01-19-2012, 10:01 PM   #8
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Driveshaft center support bearing
Trust me
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Old 01-19-2012, 10:20 PM   #9
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^ I never wouldve thought that but very likely.
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Old 01-19-2012, 10:31 PM   #10
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Quote:
Originally Posted by s13_kidd View Post
Driveshaft center support bearing
Trust me
I dunno. I checked it and it looks good. No cracking or missing rubber.

I plan on replacing motor mounts and that if I can find one.
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Old 01-19-2012, 10:59 PM   #11
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buy driftfreq mounts from him on here! I love them!
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Old 01-20-2012, 08:26 AM   #12
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Anymore ideas?
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Old 01-20-2012, 09:10 AM   #13
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Quote:
Originally Posted by s13_kidd View Post
Driveshaft center support bearing
Trust me
x1 - had similar problem. I went with a one-piece DS.
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Old 01-20-2012, 04:22 PM   #14
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Quote:
Originally Posted by SMM View Post
Anymore ideas?
On mounts? I started this thread a few months back maybe itll help.

http://zilvia.net/f/s-chassis/411500...ggestions.html
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Old 01-20-2012, 07:58 PM   #15
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Figured out the problem.

S13 transmission rear dust cover is different than the s14 one. Causing it rub the driveshaft. Take this off and it will be fine.

So when using a s13 KA trans on S14 car, make sure you shave down or take off dust cover on the rear of transmission ( black ring where the driveshaft slides into).

My car is an s14 with s13 ka trans.


Another thread for reference:

http://zilvia.net/f/s-chassis/400977...wing-down.html
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Old 01-20-2012, 08:08 PM   #16
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Nice glad you figured it out
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