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S80 '98-'06 / S60 '00-'09 / V70 & XC70 '00-'07 General Forum for the P2-platform S60 / V70 / XC70 / S80 models |
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Mk 2 rear suspension issueViews : 2207 Replies : 40Users Viewing This Thread : |
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Mar 12th, 2019, 19:26 | #11 | |
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Location: Transylvania
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Internal spring compressor.
Quote:
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V70 D5 2002 Manual 517.000 km (321.000 miles) |
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Mar 12th, 2019, 20:19 | #12 |
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Last Online: Sep 11th, 2023 13:10
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Location: Chippenham
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Not sure I’ve read this correctly, but you changed springs and not shocks and now it’s soft and bouncy or is it so stiff it bounces on the tyres?
If you’ve put springs that are too stiff, the damper won’t get a chance to do anything, the suspension will essentially lock out and you’ll bounce into oversteer at high rates across the road. If the springs are soft, then it’ll wallow like a hippo getting a belly brush-wash in the zoo. If it’s riding an inch higher all of a sudden then chances are it’s incorrectly mounted or the springs are too stiff. (Tedious description time:- Suspension has three major stiffnesses (ignoring bushes and subframe stiffness for now):- absolute position (opposed by the spring) speed related (opposed by the damper) and relative position (opposed by the anti roll bar. A too stiff spring simply won’t move as much for a given force, remembering that f=kx. You need a lot more f to get an x if k is too high. If there’s no movement, how can dampers control it? If the overall rate of the spring is tool low, then the car will roll around. Yes, it has an anti-roll bar, but that’s a tuning device, not the absolute definition of roll stiffness.) However, there’s some history here thats not clear: why had you changed the springs and not the dampers? What caused you to come to the conclusion that the springs were somehow defective? Unless they’re actually rusted through and broken, they’ll outlive the dampers every time. Even if the springs are rooted, they won’t be as rooted as the dampers. What else has been changed? |
Mar 12th, 2019, 21:53 | #13 | |
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the 1" difference in the ride heighth was due to placing both new and old springs together and measuring the difference. when driving the car on a straight flat road the ride is good not hard or even too soft , its only when going over an uneven part of the road but only at one side or other like a drain cover or rough tarmac, it skits about. shocks are standard and not nivomat. Last edited by gar v70; Mar 12th, 2019 at 23:04. |
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Mar 13th, 2019, 16:58 | #15 |
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First guest would be that you’ve fitted the wrong springs....
Springs don’t lose an inch of length through use unless bits break off. |
Mar 13th, 2019, 19:21 | #16 |
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apparently so I've read, springs will lose about an 1" over approx. 100000 miles because the spring goes weaker and as mine has done 210000 its probably about right.. also I have measured the ride heighth and is correct to standard dimensions
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Mar 13th, 2019, 19:22 | #17 |
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Mar 14th, 2019, 16:05 | #20 |
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What are monroe shocks like, are they any good
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