I really have fear to rise the cornering speed more.
With the new datalogger tool I found out that the normal cornering forces
are up to 1.5G and in excess 1.9G.
The 5 degree camber is responsible for that (and give the car a dirty look
like a showboat).
But at the moment I'm really happy with my setup and how sensible the car
react on changes to the setup like stiffening the swaybars or soften them.
Tire pressure.
The most gain brought to remove all rubber out of the front suspension and
replaced it all with Deldrin bushings.
As you can see even on a bumpy track like the Nordschleife I have not much
to do at the steering (maybe I'm going too slow?)
Cheers
Chris
-----Urspr|ngliche Nachricht-----
Von: Bill Babcock [mailto:billb@bnj.com]
Gesendet: Donnerstag, 5. August 2010 18:45
An: MadMarx
Cc: 'Tim Murphy'; 'Greg "Lunker" Hilyer'; 'MIKE DEWEERD'; fot@autox.team.net
Betreff: Re: [Fot] Hard cornering
No, radius rods keep the axle from shifting forward and back on the springs,
panhard bars prevent lateral movement. The purpose of radius rods and
panhard bars is to provide a stable platform to optimize the suspension and
steering from. By themselves they do very little for handling with a car as
far from good racing suspension design as a TR3/4. But if you get everything
else right they become critical. When the radius rods on Peyote break or get
otherwise disconnected the car handles like crap.
There is no recipe for suspension that will make a TR handle as there is for
modern cars which generally don't have fundamental design flaws. The
cheapest econobox has a rigid platform, no bump steer, camber and camber
gain that is optimized for the recommended tires, no spring tramping, and a
precisely designed amount of understeer to keep Mom out of trouble. If you
want to race one of those cars you buy the parts package that EVERYONE knows
works, install it properly, bolt in a roll cage and you're set to spend some
real money moving from the back to the front. But your car will handle as
well as it can for the given platform.
Our cars are not so simple and the recipe and results depends on the chef.
The way these conversations progress, talking about individual elements
instead of a package, is a clear indication that it's art rather than
engineering. If you wanted to take a more engineering approach you'd get the
platform stable first, then apply core engineering principles to make the
car steer and handle at high speed. The art approach works just fine, but
focusing on blueberries doesn't yield a fine pie.
On Aug 5, 2010, at 7:42 AM, MadMarx wrote:
> If the radius arm is something like a Panhard rod or a Watts link then it
> seems that most of the European racers don't use them.
>
> Chris
>
> -----Urspr|ngliche Nachricht-----
> Von: fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net] Im
> Auftrag von Tim Murphy
> Gesendet: Donnerstag, 5. August 2010 16:14
> An: 'Greg "Lunker" Hilyer'; 'MIKE DEWEERD'
> Cc: fot@autox.team.net
> Betreff: Re: [Fot] Hard cornering
>
> FWIW One thing that Uncle Jack told me about radius rods is that the
pivot
> points have to be such that the rods are parallel to the axle such that
they
> don't pull or push on the axle when it moves up and down. Probably not as
> easy as it sounds to achieve. They were on our car when we got it and
Jack
> said he had tried them on his car and found they really didn't help that
> much and were difficult to setup so he took them off. We never put ours
on
> when we built the car.
>
> Tim
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