Shot Shocks - Rennlist Discussion Forums
Rennlist Discussion Forums   classifieds | membership | rennlist | photo album    
sponsors | upload photo | chat    
 
Go Back   Rennlist Discussion Forums > Air/Oil Cooled Technical Discussion Areas > 993 Forum
Sign in using an external account
Register Forgot Password?
Search

Reply
 
Thread Tools Search this Thread
Old 01-04-2005, 01:50 AM   #1
Sputnik
User
 
Sputnik's Avatar
 
Join Date: Aug 2002
Location: Santa Monica, Ca
Posts: 402
Default Shot Shocks

Hi all,

I've just curious what could be the symptoms of shot OEM shocks?
My car has 37.7K miles on odometer. Should I suspect my shocks are dead? May be it is time for for Mr. Bilstein?.... AJUSA has some special deal on them right at this moment. I just would like to make sure the shocks really need the replacement.
Thanks in advance!
To remove this ad, register today or login if you already are registered!

Sputnik is offline   Reply With Quote
Old 01-04-2005, 01:54 AM   #2
Phil
Phlat Black Guru
Rennlist
Lifetime Member
- Times 2

 
Phil's Avatar
 
Join Date: May 2001
Location: Back In RI...............
Posts: 4,462
Default

the first symptom........37.7k miles......
but don't be sad.......its just time to upgrade.....
__________________
Phil


'04 GT3 RSR Le Mans entrant
Team Promoter /Driver "Hey, Wait for me Racing"

You kids shouldn't play so rough, someone is gonna get hurt
Phil is offline   Reply With Quote
Old 01-04-2005, 02:01 AM   #3
Sputnik
User
 
Sputnik's Avatar
 
Join Date: Aug 2002
Location: Santa Monica, Ca
Posts: 402
Default

I am not sad! I just need a reason!
Sputnik is offline   Reply With Quote
Old 01-04-2005, 02:02 AM   #4
1999Porsche911
Super User
 
1999Porsche911's Avatar
 
Join Date: Apr 2004
Location: Chicagoland
Posts: 4,159
Default

Your shocks should last for the life of your car. This is particularly true of your car because of the short throw of the struts. One symptom of a bad shock is continued bouncing after hitting a bump. You should be able to press down on the corner of your car and the car should spring back up with no bouncing.
1999Porsche911 is offline   Reply With Quote
Old 01-04-2005, 02:12 AM   #5
Robert Henriksen
Addict
Rennlist Member

 
Robert Henriksen's Avatar
 
Join Date: May 2001
Location: Houston, Tx
Posts: 2,960
Default

Quote:
Originally Posted by 1999Porsche911
Your shocks should last for the life of your car.
Robert Henriksen is offline   Reply With Quote
Old 01-04-2005, 02:16 AM   #6
Phil
Phlat Black Guru
Rennlist
Lifetime Member
- Times 2

 
Phil's Avatar
 
Join Date: May 2001
Location: Back In RI...............
Posts: 4,462
Default

Quote:
Originally Posted by 1999Porsche911
Your shocks should last for the life of your car. This is particularly true of your car because of the short throw of the struts. One symptom of a bad shock is continued bouncing after hitting a bump. You should be able to press down on the corner of your car and the car should spring back up with no bouncing.
"your shocks should last for the life of your car"....
Huh?
could you please explain that?....
__________________
Phil


'04 GT3 RSR Le Mans entrant
Team Promoter /Driver "Hey, Wait for me Racing"

You kids shouldn't play so rough, someone is gonna get hurt
Phil is offline   Reply With Quote
Old 01-04-2005, 02:19 AM   #7
viperbob
Former Vendor
 
viperbob's Avatar
 
Join Date: May 2002
Location: Tampa
Posts: 6,845
Default

These cars have shocks that last about 5 years. After this, regardless of mileage, the seals seem to start leaking. It is slow so you do not really notice it. I have installed 50+ suspensions on 993s this past year, and to a number there was maybe one that the rear shocks were in fair shape. The rest, even a '98 with 6K miles, were bad. Thr fronts seem to be worse in most cases. No bump stopping capability (you can instantly compress it with your hands) and usually no or maybe a little rebound. This is also validated with the drivers after the install that notice a smoother yet more predictable ride...
viperbob is offline   Reply With Quote
Old 01-04-2005, 02:22 AM   #8
mleds
User
 
mleds's Avatar
 
Join Date: Aug 2004
Location: Los Angeles
Posts: 321
Default

The difference was immense on my car. I am so glad I replaced the factory shocks with the Bilstien HD's. The car is just awesome now.
mleds is offline   Reply With Quote
Old 01-04-2005, 02:31 AM   #9
DJ
Haiku Grasshoppa
Rennlist Member
Can I Drove Your Car?

 
DJ's Avatar
 
Join Date: May 2001
Location: Grants Pass, OR
Posts: 1,173
Default

Quote:
Originally Posted by 1999Porsche911
Your shocks should last for the life of your car.
I don't think so. If Porsche expected them to last that long, why do they consider them a "wear-item", in the same category as brake pads, windshield wiper blades, tires... Do you expect your tires to last the life of your car? How about your oil? I have a pretty fair amount of experience in at least several dozen 993s, and could notice a substantial amount of wear on the shocks of EVERY one that had over 20k miles. On my personal 993, I could feel more wear than I wanted to tolerate at 10k miles.

Shocks wear very slowly, and gradually get worse and worse. If you don't know what it's supposed to feel like, then you likely won't notice the slow degradation until it's really bad. By that time, most have driven their cars for thousands (if not tens of thousands) of miles with bad (worn out) shocks, suffering from a bad ride, and poor handling.

Quote:
This is particularly true of your car because of the short throw of the struts.
I'm not an engineer, so I probably don't understand all the physical forces at work. Can you explain this to me?

Quote:
You should be able to press down on the corner of your car and the car should spring back up with no bouncing.
Yes, this test is very much like using visual inspection on a tire that is completely shredded off the rim. If you can see the holes where all the air fell out, then it's likely that it's time to replace that tire. A shock that allows the car to continue bouncing after you push down on the fender has been wore out for a very, very long time (and it should have been replaced thousands--if not tens of thousands--of miles ago).


At 37k miles, I will bet the price of your car that your shocks are wore out. Do they need to be replaced? No, of course not. You don't ever need to replace your tires either, nor your brake pads, wiper blades, or oil, but it's much more enjoyable to drive the car if you do.
DJ is offline   Reply With Quote
Old 01-04-2005, 01:34 PM   #10
Radar
Addict
Rennlist Member
 
Join Date: Jun 2001
Posts: 209
Default

Quote:
Originally Posted by viperbob
These cars have shocks that last about 5 years. After this, regardless of mileage, the seals seem to start leaking. It is slow so you do not really notice it. I have installed 50+ suspensions on 993s this past year, and to a number there was maybe one that the rear shocks were in fair shape. The rest, even a '98 with 6K miles, were bad. Thr fronts seem to be worse in most cases. No bump stopping capability (you can instantly compress it with your hands) and usually no or maybe a little rebound. This is also validated with the drivers after the install that notice a smoother yet more predictable ride...
So, are you saying that a shock should be good until its seals start leaking? I guess I've been throwing a lot of money away for years. I always replace my OEM shocks as soon as I notice handling degradation. Almost always that happens a lot sooner than 5 years and with no apparent leaks.
Radar is offline   Reply With Quote
Old 01-04-2005, 02:06 PM   #11
TheOtherEric
Addict
Rennlist Member
 
TheOtherEric's Avatar
 
Join Date: Nov 2002
Location: Chicago
Posts: 9,838
Default

I think the guys with experience answered the question (excluding the comment that "shocks should last for the life of your car" of course)

As an anecdote, I found that my '96 needed new shocks at 40k miles. I didn't find the press-on-the-bumper test to be useful, as the shocks had enough to prevent continued oscillations. But the ride quality was quite obviously terrible, and that's the real test. Very jarring. It was confirmed when I installed new (slightly used) shocks.
__________________
His: 1995 993 C2, speed yellow. JRZs, RS sways, other go-fast parts.
His & hers: 2014 E63 AMG wagon. Wagon? Darn right I said 600+ stock hp wagon.
TheOtherEric is offline   Reply With Quote
Old 01-04-2005, 02:14 PM   #12
Georges Rebeiz
User
 
Georges Rebeiz's Avatar
 
Join Date: May 2003
Location: Beirut,Lebanon
Posts: 185
Send a message via MSN to Georges Rebeiz
Default

Here in Lebanon , you can expect your shocks to be inspected yearly by the MOT. There are special machines whereas the car is placed on special springs and then the floor under the tyres starts vibrating and then you get a reading for each shock and the normal reading should be within two variables. If it is less then you need to change the shocks else the car does not pass the test.

Do you not have these kinds of Machines in the US. I am sure you do
Georges Rebeiz is offline   Reply With Quote
Old 01-04-2005, 02:37 PM   #13
Dr. No
snarky bastard
Rennlist Member
 
Dr. No's Avatar
 
Join Date: Sep 2003
Location: SF Bay Area
Posts: 7,375
Default

Quote:
Originally Posted by Georges Rebeiz
Here in Lebanon , you can expect your shocks to be inspected yearly by the MOT. There are special machines whereas the car is placed on special springs and then the floor under the tyres starts vibrating and then you get a reading for each shock and the normal reading should be within two variables. If it is less then you need to change the shocks else the car does not pass the test.

Do you not have these kinds of Machines in the US. I am sure you do

We do. They are called "potholes."

Actually, you'd be surprised at the rolling disasters that are free to exceed the speed limit here. We need a TUV.
__________________
97 993 Ocean Blue on Black, Bilstein HD, ROW M030, Turbo sways, Cup strut brace, FDM SSK + GR
74 914 Signal Orange 2.0 w/ KYBs and big bore kit - sold long ago


"Who is the man vain enough to suppose that the long antagonisms of history and of time can in all circumstances be adjusted by the smooth and superficial conventions of politicians and ambassadors?" Winston Churchill
Dr. No is offline   Reply With Quote
Old 01-04-2005, 02:45 PM   #14
Joe S.
Addict
Rennlist Member
 
Joe S.'s Avatar
 
Join Date: Oct 2003
Location: Los Gatos / Tahoe, CA
Posts: 2,684
Default

My rear shocks started leaking when they were 5 years old and had only 12k miles on them.
Joe S. is offline   Reply With Quote
Old 01-04-2005, 03:25 PM   #15
deltawedge
Addict
Rennlist Member
 
deltawedge's Avatar
 
Join Date: Sep 2004
Location: Aliso Viejo, CA
Posts: 296
Default

As far as shock construction is concerned, the important factors are the quality of materials used and the internal tolerances. Whether it is a short throw or a long throw shock is not directly related to shock life. In fact, the shorter the travel of the piston in the shock, the more force that needs to be generated per movement of the piston to provide a specified level of damping. As a result, the valves in the shock (assuming a fluid type shock) will undergo more stress & require tighter tolerances than a shock with a longer travel. As the parts wear, dimension changes will be more noticeable in a shock with a shorter travel compared to a longer travel. After about 23k miles, the front shocks in my 95 993 are worn. It is noticeable as a pogo stick effect on the freeway at speeds around 60-70 mph when traveling over uneven road. No leaks and the push down on the fender trick is not useful as the fender does not move when pressed on (without denting the fender). They will eventually be replaced with HDs.
deltawedge is offline   Reply With Quote
Old 01-04-2005, 03:25 PM
Rennlist



Paid Advertisement
Reply


Tags
993, asshole, bandaid, born, figures, political, rennlist, shocks, shot, to, what, zx11

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -3. The time now is 07:40 PM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.6.1
Copyright ę 1998 - 2007 Rennlist.com

Advertise on Rennlist - Privacy Statement - Terms of Service - Jobs