Notices
964 Forum 1989-1994
Sponsored by:
Sponsored by:

Suspension Motion Ratio - Spring ???

Thread Tools
 
Search this Thread
 
Old 02-10-2015, 05:49 PM
  #16  
KaiB
Nordschleife Master
 
KaiB's Avatar
 
Join Date: Feb 2011
Location: Deep Downtown Carrier, OK
Posts: 5,297
Likes: 0
Received 6 Likes on 6 Posts
Default

Originally Posted by Gus

-
In my case a friend of mine helped me determine that 300 lbs front and 600 rear which gives me a natural frequency in the front of 2.36 and 2.43 which is only 3 % higher than the front - which is a good thing
I'm not convinced this spring balance is a good thing.

The 1 to 2 (300f/600r) ratio mentioned here flies in the face of virtually ALL of the varying rates we've seen published and used successfully for years.

Last edited by KaiB; 02-10-2015 at 06:40 PM.
Old 02-10-2015, 10:32 PM
  #17  
ToSi
Burning Brakes
 
ToSi's Avatar
 
Join Date: Feb 2005
Posts: 899
Received 83 Likes on 52 Posts
Default

Originally Posted by Bill Verburg
The front is similar but not the same
the shock top is the same
the A arm is the same
the longitudinals that the A arm bolt to are different in that on a 993 the A-arm pivot is 12.5mm further outboard than on a 964, this will alter the motion ratio.
not significantly.

Being practical, 12.5mm is much shorter than the length of the strut. Moving the control arm mounting outward doesn't change the strut's angle enough to matter.
Old 02-10-2015, 11:12 PM
  #18  
Gus
Rennlist Member
Thread Starter
 
Gus's Avatar
 
Join Date: Jul 2003
Location: Peachtree City, Ga
Posts: 1,952
Likes: 0
Received 64 Likes on 54 Posts
Default

ToSi
How did you get to your numbers - I would think that the rear of the 993 would be significantly different from the 964 due to design while the front would be very close.
If you use the method I used to obtain figures on front I would be interested in knowing how close they are. As this is the actual measured shock travel to wheel travel that provides the motion ratio.

KaiB - I understand, but this is a starting point for me to begin with and one that is determined based on the measurements I have run. It may not be for everyone, but the individual that is helping me has one of the best handling cars in our area .



Quick Reply: Suspension Motion Ratio - Spring ???



All times are GMT -3. The time now is 06:59 PM.