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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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P2 V70 with 225 55 V17s - wheel spacer sizingViews : 1363 Replies : 10Users Viewing This Thread : |
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#1 |
VOC Member
Last Online: Yesterday 23:00
Join Date: May 2015
Location: Wetherby
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Just fitted new tyres to the beast. The additional height is fab and now I dont ground going onto the drive.
However! The tyres are rubbing more than normal (guessing as multi season tyres they are wider). I'm having taller springs made (+30mm) so feel that I could then accomodate spacers of say 15mm front and rear to give me back some lock and reduce rubbing. I just need to have a ladder made to climb in then I'll be fine ;-) Anyone have any advice or issues I should consider? Bear in mind this is NOT a lowering exercise. Its raising so wheel arch clearance should not be an issue... |
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#2 |
Premier Member
Last Online: Yesterday 08:04
Join Date: Aug 2008
Location: Newcastle
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I have read something about this idea on another site, but can't find the post.
IIRC fitting anything other than the standard tyre 225/45 x 17 or 235/40 x 18 will cause rubbing back and front. Fitting spacers helped but was not a cure. If I can find the details I'll post a link 4 u. Cheers Bob |
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#3 | |
Junior Member
Last Online: Apr 29th, 2024 20:38
Join Date: May 2015
Location: Beauly-ish
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Will the struts cope with your springs? How are you calculating spring rate required for the +3cm increase in height? Regarding the tyres rubbing they will if you've raised the sidewall from a 45 profile to a 55 - assuming that's what you have done? The change in springs should help alleviate that. If they're rubbing at full lock rather than on the wheelarch liners then you might need to consider changing out the steering limiter blocks. |
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#4 |
VOC Member
Last Online: Yesterday 23:00
Join Date: May 2015
Location: Wetherby
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Appreciate you replying.
Bushes and link are all new. Was told by makers that basic handling doesnt change too much as its only the coil spacing that changes. I do appreciate it would matter hugely if I were looking for handling, but at my age I'm all bout comfort! Apparently the struts will fit fine, but my mechanic isn't looking forward to the job as compressing new springs is 'fun' and taller ones even more 'fun' ;-) I've new limiter blocks to fit too. On reflection, I may drop to +25... Please explain spring rate and why you'd calc? David |
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#5 |
Junior Member
Last Online: Apr 29th, 2024 20:38
Join Date: May 2015
Location: Beauly-ish
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David - hi - as I see it 'spring rate' can be defined as the amount of continuous force it requires to compress a coil (in this instance) spring over a measurement of distance. Most commonly the measurement you'll see is lbf/in (pounds of force per inch) but you may also see springs measured in N/mm (newtons per millimetre) if the metric system is used.
The practical upshot is that if 300lbf/in springs were fitted to a car which has 200lbf/in springs fitted then the ride would alter significantly for the harder and vice versa. In your case you are suggesting you might raise the ride height by fitting longer springs than the manufacturer intended with the OE struts. Without teaching you to suck eggs the springs are the resistance to the road surface and compress under load before trying to 'bounce back' to their original size, this bouncing motion would continue unless the force of the springs action were damped which is where the shock absorber (damper) or strut comes in. A variable rate springs would seem to be the answer, these usually have a lower initial spring rate (giving a compliant ride initially) which rapidly becomes a higher rate as the spring is fully compressed. This is essentially the spring type found on a road suitable coilover system. In a long winded kind of way I coming to why I think you might wish to look at the spring rate.... so, with the above in my mind, it strikes me that longer springs are not necessarily the answer to your issue. A variable rate spring might be a solution but the ultimate answer might be coilovers. Coilovers are as much about maximum extension/travel as they are about slamming a car to the deck and - handily - they tend to come with the progressive springs I think you actually need over longer springs which I'm uncertain are desirable unless very carefully worked out. |
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#6 |
I've Been Banned
Last Online: Mar 19th, 2016 19:57
Join Date: Oct 2013
Location: Yondershire
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I'd be inclined to agree with a lot of what INS says, by raising it on the same poundage spring the car may feel more boaty.
Progressively wound springs are used in many vehicles to great effect, not sure why Volvo elected to avoid them as i think they would be a great enhancement to a rather dull and floaty chassis. Not sure that coil-overs are neccessary but a set of progressive springs would be on my shopping list, with the primary winding being soft, a little softer than you have at present but winding up to maybe a 20% increase in the secondary poundage, this i feel would make for an improved chassis whilst still beng as comfortable, if not more so. |
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#7 |
Master Member
Last Online: Feb 10th, 2022 22:33
Join Date: Jul 2007
Location: newton abbot in sunny Devon
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XC70 springs would be longer as they sit higher ?.
I guess changing the ride hight would mess up the alignment.
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Last edited by harveys; Dec 11th, 2015 at 21:06. |
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