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Old 05-16-2019, 09:44 PM   #1
Rusty_ratchet
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Default Longevity of Moog Springs / Bumpy Ride

1985 Volvo 244

About 10 months / 12 k miles ago I replaced my rear springs with Moog CC215 springs. About 3 months / 3k miles ago I replaced my rear shocks with Bilstein HD shocks. Over the past few months it has felt like there is progressively less shock absorption in the rear. I need to go over speed bumps slowly otherwise it feels like the car really drops. It feels like it is the result of the spring, not the shock (there is no residual bouncing). My suspicion is that the Moog springs might be going bad. Has anyone else had this experience and found the springs to not last very long?
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Old 05-16-2019, 11:16 PM   #2
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Replace shocks

Gabriel Answerman Tip - Bounce Test and Shock/Strut Replacement Hints
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Old 05-16-2019, 11:27 PM   #3
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Replace shocks

Gabriel Answerman Tip - Bounce Test and Shock/Strut Replacement Hints
I don't notice any bouncing, it feels like the rear of the car drops when I go over a speed pump.
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Old 05-16-2019, 11:31 PM   #4
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I'm not sure the billy hd shocks we get today are the same beasts they were years ago. I've also blown one out on an unlowered car with new stock rate springs.
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Old 05-17-2019, 08:40 AM   #5
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I'm not sure the billy hd shocks we get today are the same beasts they were years ago. I've also blown one out on an unlowered car with new stock rate springs.
That's good to know. Perhaps I'll check them off the car this weekend.
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Old 05-17-2019, 01:05 PM   #6
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Originally Posted by Rusty_ratchet View Post
I need to go over speed bumps slowly otherwise it feels like the car really drops. It feels like it is the result of the spring, not the shock (there is no residual bouncing). My suspicion is that the Moog springs might be going bad. Has anyone else had this experience and found the springs to not last very long?
it's the shocks, I had the same thing happen on speed bumps with rear Bilstein HDs, replaced them with Konis and all good now
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Old 05-17-2019, 05:45 PM   #7
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How to Choose the Right Shocks
https://www.youtube.com/watch?v=NSwBro7HTn4
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Old 05-17-2019, 05:53 PM   #8
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Old 05-17-2019, 07:19 PM   #9
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I just checked one side. I removed the shock from the car and it was fine. It had plenty of resistance pushing it down, and rebounded as expected.
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Old 05-17-2019, 07:36 PM   #10
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I just checked one side. I removed the shock from the car and it was fine. It had plenty of resistance pushing it down, and rebounded as expected.
That merely tells you there is gas pressure..Compress them and then pull them out at a speed of 0,52m/s* and then tell us how much resistance there is in n/m....

*that's 20.47 inches per second...
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Old 05-18-2019, 01:48 PM   #11
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That merely tells you there is gas pressure..Compress them and then pull them out at a speed of 0,52m/s* and then tell us how much resistance there is in n/m....

*that's 20.47 inches per second...
I'll order some new shocks. Thanks.
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Old 05-18-2019, 06:05 PM   #12
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from Anthony Hyde's Volvo pages...

"Bilstein rear shocks are strong when it comes to controling big movements, but this is not typical of road or good track surfaces. In my opinion, the valving on rear Bilsteins seems better suited for use as a rally shock than a road shock. For general road use, myself and others find them stiff in short stroke compression - meaning they bang over the bumps. Expensive re-valving is the answer, In words ask for - softer on compression, firmer on rebound. See link to Dave Bartons's figures at end of his article."


LINK
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Old 05-18-2019, 09:51 PM   #13
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Quote:
Originally Posted by philski o'flood View Post
from Anthony Hyde's Volvo pages...

"Bilstein rear shocks are strong when it comes to controling big movements, but this is not typical of road or good track surfaces. In my opinion, the valving on rear Bilsteins seems better suited for use as a rally shock than a road shock. For general road use, myself and others find them stiff in short stroke compression - meaning they bang over the bumps. Expensive re-valving is the answer, In words ask for - softer on compression, firmer on rebound. See link to Dave Bartons's figures at end of his article."


LINK
Is it still reasonable to use Bilstin HD for the front?
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Old 05-18-2019, 10:16 PM   #14
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Quote:
Originally Posted by philski o'flood View Post
from Anthony Hyde's Volvo pages...

"Bilstein rear shocks are strong when it comes to controling big movements, but this is not typical of road or good track surfaces. In my opinion, the valving on rear Bilsteins seems better suited for use as a rally shock than a road shock. For general road use, myself and others find them stiff in short stroke compression - meaning they bang over the bumps. Expensive re-valving is the answer, In words ask for - softer on compression, firmer on rebound. See link to Dave Bartons's figures at end of his article."


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Quote:
Originally Posted by Rusty_ratchet View Post
Is it still reasonable to use Bilstin HD for the front?
t-dot performance in Canada sells several valvings for bilstein struts at close to the same price as standard ones. They used to list other valving rear shocks as well, like 6 months ago. Might want to fire them an email, Or get Gaz from yoshi or Konis
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