Post 790790 by jamesy12345 on 2015-11-14 19:21:42
Daft question time again...does anyone have an idea of front & rear unsprung weights on the P80 cars - wheels, tyres, brakes, uprights, wishbones, driveshafts too I guess
Daft question time again...does anyone have an idea of front & rear unsprung weights on the P80 cars - wheels, tyres, brakes, uprights, wishbones, driveshafts too I guess
sorry I can't help at present with a question like that, but it is like asking for exhaust manifold data ( asking for flow rates ) it doesn't appear that on uk volvo sites that people post the same information that we'd expect to find on (for example) mini/A'series sites where anything and everything though the years is tested and reported for it's worth and possible benefits. Nobody here can as far as I'm aware get a definitive answer on whether the S60/70R manifold actually can flow better than the Japanifold and by how much, you would think by now they would have been flow tested and the results in, or am I to old skool, may be I should get Claymore round to mine and and we'll knock up form of flow bench and test things on there in real world valves and report on the possible performance merits. Also on here people say they've ported there head.....no they have just really matched manifold - gasket - head....porting a head requires a flow bench to prove performance increases on what ever port modification has been made (Ok any smoothing has to be a benefit) but loses can easily be made too. I do hope you get the figures you seek, I could weigh individual items for you if you wish as I have most of a v70/850 in bits here, pm me a list of what you need and I'll do my best mate, may be we should start a thread on component weights and alternatives if available
Cheers for the reply Adrian, did you see the PPC magazine where the guy built a flow bench for his Merlin engined rover? DIY job with some vacuum cleaners from memory About unsprung weights, thanks very much for the offer to weigh the items....I wouldn't want you to take your time up with it, reason for asking was that I was looking through the book below: http://www.amazon.co.uk/Competition-Car-Suspension-Practical-Handbook/dp/1844253287 (200 quid on Amazon or search 'Competition_Car_Suspension.pdf' and read it for free) Chapter 8 is all about weight transfer & I was trying to put the figures for my S70 into the calcs in the book by making an Excel spreadsheet. I was interested in what effect there is from reducing the unsprung weight has & stiffening the roll bars, on wheel loads through a corner. Looking on the net for unsprung weight turns up not much information - apart from a comment in this article that it will be about 13 to 15% of the kerb weight, that seems high remembering when me & Steve Sideways changed the suspension...so I just used 200 kg front & 150 kg back From the book (1G corner, in pounds weight btw): [ATTACH=CONFIG]29964[/ATTACH] From my spreadsheet in KG, numbers on the right relate to the S70 with standard ARB / 22 mm solid rear ARB / 22 mm ARB + knocking huge amount of KG off unsprung weight (50 kg never going to happen): [ATTACH=CONFIG]29963[/ATTACH] According to that, putting a 22 mm rear ARB on gives a better average load across the front two tyres, & says there will be lift off on the inner corner (which there won't be as I doubt the chassis is stiff enough)...but at least seems IMHO to prove the idea of uprated rear ARB improves turn-in/reduces understeer...? Reducing unsprung weight doesn't seem to make much difference at least for weight transfer. But although not very important, it still would be interesting to know how close 200/150 kg is to reality