FOT;
I deliberately didn't say what car 'cause I didn't want to unfavorably
bias the responses <G>. It's a 67 AH 3000 to which we've fitted a brake
conversion (4-pot calipers, vented rotors) on the front and discs on the
rear. The question isn't so much about this car, but rather a generic
question about how to establish what the balance is on any car. The
specific car becomes an issue when trying to determine how to change the
balance.
David Talbott wrote:
>
> I've seen people use gauges to define the pressures, and they are
probably very useful to be in the ballpark when you roll off of the trailer.
Pressure measurements would be a starting point, but pad material ie
friction coefficient, unless the same front and rear, would negate
anything you learn by measuring pressures. The seat-of-the-pants method
seems to be the consensus. We were looking for something
measurable/repeatable.
Tony Drews wrote:
> Since part of the setup depends on how much friction your particular
front and rear pads / shoes have, I don't think there's way other than
seat-of-the-pants.
We have installed softer pads in the rear (semi-metallic in the
front) for exactly that reason; to give the rears more bite. We're also
very aware of the difference tires make, since that's where all the
actual work occurs. An interesting note is that stickier tires push the
bias forward due to increased weight transfer under braking. What we're
looking for is a measurable, ie repeatable way of determining where the
balance is now and when we get it right. So far all the response
advocate seat-of-the-pants adjustments.
Doing seat-of-the-pants in a race car would be lot easier than
pushing a car on the street at the 7/10 or more needed to show a
problem. On this particular car, in a straight line the fronts lock
first. Does that mean we've got 51% front and 49% rear or 90% front and
10% rear? By measuring the temps we surmise that it's more like 60% or
70% front. We'll install a proportioning valve and measure some more
temps and do lots more driving and adjusting.
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