Notices
924/931/944/951/968 Forum Porsche 924, 924S, 931, 944, 944S, 944S2, 951, and 968 discussion, how-to guides, and technical help. (1976-1995)
Sponsored by:
Sponsored by:

Anyone experience vibration under hard Accel?

Thread Tools
 
Search this Thread
 
Old 09-07-2007, 09:17 PM
  #1  
porscheEH!
Instructor
Thread Starter
 
porscheEH!'s Avatar
 
Join Date: Apr 2007
Posts: 146
Likes: 0
Received 0 Likes on 0 Posts
Default Anyone experience vibration under hard Accel?

It's not a huge deal I can live with it, I just wondered what it is? for example. when i'm coming onto the high off a onramp and floor or near floor it in 4th from about 90km.h to 140km/h it has a pretty noticeable vibration or shudder until I shift into 5th and let go the gas it dissappears.
Old 09-07-2007, 10:34 PM
  #2  
F18Rep
Three Wheelin'
 
F18Rep's Avatar
 
Join Date: Dec 2002
Location: St Louis, Missouri, USA
Posts: 1,825
Likes: 0
Received 2 Likes on 2 Posts
Default

Just turn that **** down a little and the tires don't break loose so easy...;] Bruce
Old 09-07-2007, 10:37 PM
  #3  
Lanny Curlett
Burning Brakes
 
Lanny Curlett's Avatar
 
Join Date: Jun 2006
Location: Lethbridge, Alberta, Canada
Posts: 771
Likes: 0
Received 0 Likes on 0 Posts
Default

I had the happening just before my clutch went.
Old 09-07-2007, 10:54 PM
  #4  
porscheEH!
Instructor
Thread Starter
 
porscheEH!'s Avatar
 
Join Date: Apr 2007
Posts: 146
Likes: 0
Received 0 Likes on 0 Posts
Default

NO!!! hopefully it's not a clutch lol . It's doesn't slip though? could it still go and not be sliping?
Old 09-07-2007, 11:02 PM
  #5  
KuHL 951
Hey Man
Rennlist Member

 
KuHL 951's Avatar
 
Join Date: Jul 2003
Location: Nor Cal, Seal Rock, OR
Posts: 16,525
Received 188 Likes on 112 Posts
Default

Sometimes the disc and PP can get glazed from previous slippage. All it takes is a little chatter from loss of friction to cause what you describe. At the very least check/adjust your pedal freeplay. Glazing will disappear with use, a failing clutch won't. You feel it in 5th the most because the gearing is so high.
Old 09-07-2007, 11:12 PM
  #6  
NeoRules
Burning Brakes
 
NeoRules's Avatar
 
Join Date: Aug 2006
Location: Fredericksburg VA
Posts: 777
Likes: 0
Received 0 Likes on 0 Posts
Default

I had similar... Blew a CV axle..
check out the thread if you like...
https://rennlist.com/forums/showthre...eavy+vibration
Old 09-07-2007, 11:24 PM
  #7  
Yummybud924
Drifting
 
Yummybud924's Avatar
 
Join Date: May 2004
Location: Vancouver,BC
Posts: 2,854
Likes: 0
Received 2 Likes on 2 Posts
Default

lol I swear my engine cut out today for a fraction of a second when I was accelerating hard, made some weird vibration and went away.
Old 09-07-2007, 11:30 PM
  #8  
Andial951
Legend Killer
Rennlist Member
 
Andial951's Avatar
 
Join Date: Jul 2005
Location: Nor-Cal
Posts: 4,296
Likes: 0
Received 0 Likes on 0 Posts
Default

this always happens to me just as I break the sound barrier.............
Old 09-08-2007, 01:24 AM
  #9  
Caboose
Instructor
 
Caboose's Avatar
 
Join Date: Apr 2007
Location: Jacksonville NC
Posts: 225
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by F18Rep
Just turn that **** down a little and the tires don't break loose so easy...;] Bruce
What ****?
Old 09-08-2007, 08:49 AM
  #10  
bader$
Burning Brakes
 
bader$'s Avatar
 
Join Date: Mar 2003
Location: Marietta GA
Posts: 851
Likes: 0
Received 0 Likes on 0 Posts
Default

It probably is cv joints. they get wear patterns in them and when you accellerate hard the car squats and they run in and out of the grooves. One way to find out is take them out and swap them making sure to keep the outside out. I think they are the same on both ends but doing it this way will ensure proper reinstallation.
Old 09-08-2007, 11:31 AM
  #11  
porscheEH!
Instructor
Thread Starter
 
porscheEH!'s Avatar
 
Join Date: Apr 2007
Posts: 146
Likes: 0
Received 0 Likes on 0 Posts
Default

If i'm going to do that i might as well replace them?? It's quite extensive to remove the cv joints ins't it? you have to remove the entire rear spindle? also cv joints are 600$ a piece new lol
Old 09-08-2007, 11:32 AM
  #12  
porscheEH!
Instructor
Thread Starter
 
porscheEH!'s Avatar
 
Join Date: Apr 2007
Posts: 146
Likes: 0
Received 0 Likes on 0 Posts
Default

and for the clutch glazing, is there any liquid etc I can spray, pour onto the clutch to deglaze it? Also I know my motor mounts are for sure shot. but it's somthing drive/suspension related to make this kinda of vibration.
Old 09-08-2007, 01:46 PM
  #13  
bader$
Burning Brakes
 
bader$'s Avatar
 
Join Date: Mar 2003
Location: Marietta GA
Posts: 851
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by porscheEH!
If i'm going to do that i might as well replace them?? It's quite extensive to remove the cv joints ins't it? you have to remove the entire rear spindle? also cv joints are 600$ a piece new lol

No, the axles just bolt in to the hub on the transmission and the spindles. You acn buy new joint kits for $100 each (need 4) or rebuilt axles for 180each.
Old 09-08-2007, 01:47 PM
  #14  
bader$
Burning Brakes
 
bader$'s Avatar
 
Join Date: Mar 2003
Location: Marietta GA
Posts: 851
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by porscheEH!
and for the clutch glazing, is there any liquid etc I can spray, pour onto the clutch to deglaze it? Also I know my motor mounts are for sure shot. but it's somthing drive/suspension related to make this kinda of vibration.
No, but the clutch is fully engaged on hard acceleration so it would not be the cause.
Old 09-08-2007, 01:58 PM
  #15  
V2Rocket
Rainman
Rennlist Member
 
V2Rocket's Avatar
 
Join Date: Jan 2007
Location: Nashville, TN
Posts: 45,578
Received 656 Likes on 509 Posts
Default

You might have a loose tranny mount..


Quick Reply: Anyone experience vibration under hard Accel?



All times are GMT -3. The time now is 07:36 AM.