C4S vibration on deceleration
Drifting
Joined: Oct 2011
Posts: 3,217
Likes: 14
From: Texas
Pelican carries the guibo disc now for $94.75. You will notice a difference if yours was badly cracked like mine.
http://www.pelicanparts.com/catalog/...SUSAXL_pg3.htm
http://www.pelicanparts.com/catalog/...SUSAXL_pg3.htm
Last edited by KrazyK; Apr 27, 2016 at 10:25 AM.
Thread Starter
Banned
Joined: Sep 2007
Posts: 770
Likes: 2
Thanks Keith! It's not terribly cracked, no missing chunks and you really have to look hard to see the hairline cracks but at this point worth replacing for sure.
Also new data point - the vibration only occurs when the car is at full operating temperature. I usually stay at below 3k rpms until the temp gauge reaches 180 and then I don't exceed 4k rpms until I am running at that temp for a few miles more.
Yesterday I decided to give it a try before it reached 180 and no vibration. Tried it again this morning and no vibration. Drove until I was at 180 for a few miles and tried it again and viola the vibration is there. I am thinking anything from motor mounts are tighter while cold to engine clearances are tighter while cold. Car runs extremely well but I tend not to ignore anything that is out of the ordinary.
At this point I will try to be methodical because I want to know the cause. I am going to replace motor mounts first and see what happens and then will replace the guibo disc regardless of the result.
Also new data point - the vibration only occurs when the car is at full operating temperature. I usually stay at below 3k rpms until the temp gauge reaches 180 and then I don't exceed 4k rpms until I am running at that temp for a few miles more.
Yesterday I decided to give it a try before it reached 180 and no vibration. Tried it again this morning and no vibration. Drove until I was at 180 for a few miles and tried it again and viola the vibration is there. I am thinking anything from motor mounts are tighter while cold to engine clearances are tighter while cold. Car runs extremely well but I tend not to ignore anything that is out of the ordinary.
At this point I will try to be methodical because I want to know the cause. I am going to replace motor mounts first and see what happens and then will replace the guibo disc regardless of the result.
