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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars |
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How low should I go?..Views : 1092 Replies : 15Users Viewing This Thread : |
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Jan 14th, 2024, 00:03 | #11 | |
Trader Volvo in my veins
Last Online: Today 12:24
Join Date: Dec 2004
Location: Anglesey
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Quote:
Lowering springs do need to be stiffer than standard spring rate. Too stiff and the ride is harsh and too soft and the ride is harsh. Typically too stiff is harsh at low speed and too soft is harsh at speed. Most Lesjofors spring sets tend to be at the too soft end of the scale. (140 sets are on the stiffer end of right for the front and softer end of right in the rear but they might of changed since I last tested a set) Dampers that are matched to the weight and spring rate are also important as over damped will harsh and under damped will be harsh! Get it wrong and the ride is harsh, both springs and dampers need to be in the window. Due to the low weight in the rear of the car progressive springs are usually better in the back, they are not softer as often stated. It is the increase in travel and the the soft section when the wheel is unweighted that helps |
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Jan 14th, 2024, 09:39 | #12 |
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Last Online: May 20th, 2024 09:33
Join Date: Sep 2023
Location: Stirlingshire
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Thanks, that's helpful.
Looks like I'm after 40mm progressive lowering springs with some suitable shocks. On my previous car I fitted 40 mm lowering springs, IPD front ARB and Bilsteins and poly bushes all round. The car certainly behaved better on cornering but you could feel every single variation on the road surface! This time I hope to get the same cornering but perhaps a more comfortable drive generally. |
Jan 14th, 2024, 18:38 | #13 |
VOC Member
Last Online: Today 12:33
Join Date: Jul 2006
Location: Chatham
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Poly and comfort don't usually make good bedfellows but poly density does vary. Volvo's original rubber bushes were OK. NVH wasn't such a big issue as it is today. Modern/current rubber bushes, even from Volvo, don't tend to be as good as they were originally. Bottom line, maybe soft rated poly bushes the best choice except on the body end of the Panhard rod when I'd still pick the original rubber one #87033
As spring is actually a torsion bar so if you shorten it the stiffness increases. |
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Jan 15th, 2024, 16:00 | #14 |
Not so New Member
Last Online: May 20th, 2024 09:33
Join Date: Sep 2023
Location: Stirlingshire
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Thanks Derek,
That's helpful info - I hadn't realised there were different densities of poly bushes. On DOY, I fitted a 'new' rubber bush on the steering idler and it failed MOT within a couple of years. Gordon |
Jan 15th, 2024, 17:35 | #15 |
Junior Member
Last Online: Apr 15th, 2024 18:10
Join Date: Jun 2020
Location: Beekdaelen
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Lowering a P1800 decreases the driveability of the car if the road isn't smooth enough. I did bring my P1800 up to the original level (from being lowered by old springs) for my exhaust did stop me a few times (not mentioned the times the exhaust scatched the road). But my P1800 is in use as a car not as a sunday-toy: transporting things in it (up to an engine) and also using bad roads (if road is the right word for them).
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Jan 17th, 2024, 13:06 | #16 |
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Last Online: Today 12:33
Join Date: Jul 2006
Location: Chatham
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Gordon. If you look at Simon's comment on the Brookhouse site re idler bush it's possible that you used the one that he now doesn't recommend.
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