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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Does road camber affect steering?Views : 1437 Replies : 18Users Viewing This Thread : |
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Jun 14th, 2021, 23:55 | #11 | |
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Jun 15th, 2021, 13:34 | #12 |
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Thanks Dave.
Yes, the steering feels great now. The manager at National was very open, saying that setting up wheel alignment especially on older cars can be tricky. Suspension settles a bit, bolts can be hard to undo, and sometimes it takes them a couple of goes to get it right. He did sort of blame the technology - the whizzy new computerised 4-wheel system is apparently extremely sensitive, and he prefers using the older generation of light beams. He said that the new technology is so sensitive that even the vibration through the ramp from the car's engine running can affect the readout. Also he's nowhere to hide as the system has a display in the waiting area, and you're given a printout of the result - which displays the angles to the nearest minute of arc. As someone who's having to adapt to new technology at work too I can sympathise! Cheers Jack |
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Jun 15th, 2021, 14:19 | #13 | |
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There's a lot to be said for using analogue measuring kit on an analogue adjustment (such as steering) and digital kit on a digital adjustment.
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Jun 26th, 2021, 18:02 | #14 |
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And a final twist in the tail. After the tracing was re-done I didn't really get to use the car much above 50mph for a week or so. Then I had to make a quick motorway trip, and noticed that whilst the car behaved perfectly up to around 60mph, above that, and on a straight motorway, it had a tendency to pull very slightly to the left.
So I very carefully measured the tread depth on the two front tyres. The brand new on on the NSF was at 8mm, whereas the OSF was at between 5 and 6mm. Thinking about a couple of posts in this thread I thought I'd try swapping the top front wheels around. And sure enough, there is a noticeable difference. So it's a 16" wheel with 205/55 tyres. 16" is 406.4mm, 55% of 205mm is 112.75, times 2, means that the new tyre is a total of 631.9mm diameter. The other slightly worn tyre is 3mm worn, so 6mm smaller in diameter, making it 625.9. That means the circumference of the new tyre is 1985.2mm, the circumference of the part worn tyre will be 1966.3mm. So for each revolution of the new tyre, the old one has to rotate 18.9mm further, so therefore it must either rotate a little faster, or if both wheels rotate at the same speed, the slightly worn tyre will cover less ground. Either way, the directional stability of the car is going to be affected. I can only think that at lower speeds this difference isn't really noticeable, but at higher speeds it will make a noticeable difference. Add in a road camber, and the difference is magnified again. When you think about it, if you have a 4wd car the importance of matching the wear is emphasised because over time mis-matched tyre tread depths, and hence diameters can damage the differential. On that basis, for a RWD car, if you need to replace only one tyre, it'd be better to make sure that the two rears are matched in type and tread depth, whereas on a FWD drive car you'd be well advised to keep the fronts matched. After all that Maths my brain is hurting, and to be fair, in a 25-yr-old car that is not really driven a sustained high speed for much it's all a bit theoretical. Nevertheless, it's food for thought! Jack |
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Jun 26th, 2021, 18:58 | #15 |
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Interesting reading gents, once again Laird Scooby gives his excellent analysis of the problem.
My usual remedy (but not advised) is to put a string around all 4 wheels at centre axle height and shim out the front rims where the string passes through to create an all square set up then clamp the steering wheel and adjust the TRd's as required. I keep meaning to buy one of those drive on adjuster pads that indicates the toe discrepency but never got round to it........... |
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Jun 26th, 2021, 19:35 | #16 | |
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http://www.trackace.co.uk/ https://www.ebay.co.uk/itm/231601872125 The ebay link goes to one that includes the blow-moulded case - well worth having IMHO as it not only provides storage but protection while stored. Reminds me, i must exhume mine and check/adjust the Volvo and also the Rover, if i can.
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Jun 27th, 2021, 09:29 | #17 | |
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much obliged, that's a simple piece of kit and well worth a shelf in the workshop. I'll keep some Lager tokens spare in the wallet and buy one soon. |
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Jun 27th, 2021, 10:33 | #18 |
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Jun 27th, 2021, 11:39 | #19 |
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Cant trust anyone these days and very few know how to use these fangled tracking systems. if you visit all the garages offering a free tracking check you will always get differing figures. The likes of formula one etc are cowboys who need to stick to just oil changes.
As elsewhere the tyres need changing in pairs and ideally same brand. I see you got yours sorted now as a botched tracking issue. But worn suspension/steering/some brands of tyres etc can all influence driving on slightly warped roads. Dont be afraid to sue these cowboys in small claims court too if it results in damage to tyres etc |
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