Lightning
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| posted on 2/2/06 at 12:04 PM |
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Rear toe
At long last I've managed to get the nearside toe neutral. What a pain in the arse!!
Offside, spot on, but the nearside was miles out.
Suggest that Avon owners check theirs as it makes a big difference to the handling.
Steve
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DarrenW
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| posted on 2/2/06 at 01:00 PM |
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How did you do it?
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Fishface
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| posted on 2/2/06 at 01:16 PM |
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while were on the subject, how do i set up tracking, toe in etc for SVA
thanks
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jimgiblett
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| posted on 2/2/06 at 04:25 PM |
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Not sure on the optimal toe in on an Avon is I would guess a degree or two toe in. More importantly for SVA is self centreing via some castor. This
can be done by getting the top wishbones as far forward and lower wishbones as far back as possible. This can normally be achieved by inserting some
washers on the inner suspension mounts.
Once you have passed SVA I would highly recomend having the car professionally set up by someone who know what they are doing.
- Jim
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Lightning
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| posted on 2/2/06 at 05:33 PM |
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Some adjustmaent is via the Rose joints on the lower wishbone ..but...that assumes that the upper wishbone is roughly true otherwise you are pulling
against it. As was the case for me and the upper mountings had to be moved.
The problem is the angle of camber changes with ride height and adjusting the rose joints also will change the camber unless you adjust one side in
and the other the same out so as the centre line remains the same...except of course the hub is not on the centre line.
I adjusted, then back on the wheels. Measured with a laser against the chassis centre line at the front of the car, then up in the air again,
adjusted, back down, measured etc etc.
Now at about .25 degrees toe in.... N.A.D. (Near as dammit) with neutral camber.
Steve
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nitram38
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| posted on 2/2/06 at 07:45 PM |
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I am not an expert, but the order to do all adjustments is as follows:
1)adjust ride height
2) Use a cornerweight guage if possible to ensure even weight distribution
3) Set rear wheels for camber and toe in
4) adjust front wishbones for castor
5) adjust front camber
6) adjust toe in relation to centreline created by rear wheels.
7) recheck all again !
It is time consuming.
I have just bought a HPA 4 wheel tracking system from ebay and it is being set up in my garage. It can do all of the above and check other things like
kingpin inclination and setback. set....what? It even allows for wheel run out.
All of this can be printed out and stored in the memory. Only cost me £350. Once set up properly, I may consider setting other peoples cars up, if
they fit in my garage that is! (see my archive to see why)
[Edited on 2/2/06 by nitram38]
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eddymcclements
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| posted on 2/2/06 at 08:09 PM |
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Or the cheap way....
Camber can be set with a simple pendulum style gauge marked out on a sheet of plywood with graduations for degrees. By my calculations if the pendulum
is 286.5mm long you get 5mm per degree on the scale - perfectly good enough to get 1/2 degree accuracy.
Tracking can be done with a couple of identical lengths of aluminium extrusion with the centres marked and holes drilled at the outer ends. These are
mounted at wheel centre height at the front and rear of the car and fishing line stretched through the holes to provide a rectangular
"box" round the car. Measure from wheel rim to fishing line at the front and back of each wheel with a good quality steel rule to measure
tracking.
Photo here shows the rear tracking bar in place and the camber gauge is sitting on top of the
boot cover. Actual values are less important than having it the same each side, ie. anything from 0.5 to 1.5 degrees negative camber, and toe can be
anything from dead ahead to 3mm toe-in (per side). Suck it and see what feels best on your car.
Incidentally, on a book chassis you need the top wishbones as far BACK as you can get them within the brackets to achieve anything like enough
caster.
Cheers,
Eddy
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Viper
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| posted on 4/2/06 at 08:45 PM |
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quote:
Originally posted by jimgiblett
Not sure on the optimal toe in on an Avon is I would guess a degree or two toe in. More importantly for SVA is self centreing via some castor. This
can be done by getting the top wishbones as far forward and lower wishbones as far back as possible. This can normally be achieved by inserting some
washers on the inner suspension mounts.
Once you have passed SVA I would highly recomend having the car professionally set up by someone who know what they are doing.
- Jim
I think you have that the wrong way round mate. fron you r instructions you would get positive castor, great if you want the car to self center whilst
going backwards.....
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