"Ian J. McFetridge" <gator@eclipse.net> wrote :
>> I've been told that I want my car to have equal cross weights, so that is
what I shot for...adjusting the collar on the threaded shock bodies (preset)
up and down until I had what you see above. <<
Cross weights are a crude way of getting it right, using calculations
per corner as if Fred Puhn's book "how to make your car handle".
I have this procedure and more posted online at pelicanparts.com,
see their tech articles. The calculations help because they double-check
your readings at the same time you do the corrections, as each wheel
will be off by the same amount if you do it right. It tells you exactly
how much to adust each wheel. I can check your
final settings with these calcs. Picture the car from the top
facing up on your screen :
1044 959 total front = 2003 lbs, = 60%
^ total car = 3350 lbs
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717 630 total rear = 1347 lbs = 40%
left side = 1761 = 52.5%.
Right side = 1589 = 47.5%
so correct LF = 60% x 52.5% x 3350 = 1055.
(or can calc as 1761 x 60%, or 2003 x 52.5%)
correct RF = 60% x 1589 = 955
LR = 40% x 1761 = 704
RR = 40% x 1589 = 636
the differences from these numbers and your numbers are :
11 4
^
|
13 6
which is not much, within range of accuracy and calculations.
This shows that your scales were pretty accurate.
>> Out of curiosity I played with
the presets shooting for "left = 50%," i.e., even side-to-side weight
distribution measuring 50% x 3350 lbs. = 1675 lbs. of my car's weight on the
left wheels. Before I got to 50% I could see that my cross-weights were
quickly diverging: 232 lbs. difference in cross-weights and climbing! <<
You can not change your weight distribution by corner balancing,
you just want each wheel to do it's fair share of the work. YOu have to
move mass to make the left side 50%.
>> I'm told that having equal cross-weights is supposed to make the car turn
just as well to the left and to the right. Does this sound right? I assume
I would rather have 52.6% on the left and equal cross-weights rather than
50% on the left and 232+ lbs. difference in cross-weights. <<
Yes.
Regards, mike piera AnalogMike@aol.com '72 911S Targa, '73 911RS Replica
~^v^~ aNaLoG.MaN ~^v^~ vintage guitars www.analogman.com
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