rec.autos.simulators

[Fwd: F1RS: Isn't this the solution to the understeer problem??]

Eric Cot

[Fwd: F1RS: Isn't this the solution to the understeer problem??]

by Eric Cot » Mon, 12 Jan 1998 04:00:00



> > Other posters have suggested that you get around this problem by reducing
> > the steering lock, although this is a rather crude solution.

> Don't aggree with this, take a close look at some race when you can see
> the drivers wheel movement, for example i'm driving at the Nurburbring, and
> after carefully watching what the real drivers were doing, i've found out that
> opposite lock was way too high (default setups), if i was negociating a tight
> right
> hander and my own steering was turned only at 1/3 of it's maximum, then i
> thought
> the amount was way too much. So i came to a solution of 13 degrees (actually
> you can find this out in the telemetry).

> Better than that, if (for example) you have a steering wheel having 100 kOhms
> pots.
> and you use only 1/3 of it's maximum radius, roughly you'll use 33 kOmhs of it.
> So for every degree of wheel turn, you'll get 1/3 of it's maximum "sensitivity"
> thus
> making a turn more difficult to master. Now if you use the maximum of your wheel

> turning radius, then you can maximize th input for the sims (by reducing max
> lock).

> I will recall, take a close look at the in car camera, and you'll see they use
> much of the wheel
> turning radius than you can do having a max lock of 20 deg.

> Having a TSW and the chance to fully adjust my pedals deflection (same principle
> as wheel)
> Please read this post, that i've CC to Trevor Thomas:

> " I've found a way to fully exploit this fine
> product, especially for F1RS, since we all know
> acceleration without wheelspin and braking without
> locking wheels are quite an achievement to do.
> Although with practice it can be done, it needs
> lots of concentration. I was seeking for an even
> better way to improve the "modulation" or if you
> like input from the drivers.

> I'm always driving without any aids whatsoever,it's
> more realistic for me, and the achievement of breaking
> lap record lap after lap in a race is a good "drive".

> So i've found out by readjusting the linkage and
> potentiometer settings, i've increase the input
> efficiency by 152%. Which makes a hole lot of
> difference in driving consistency.

> Mainly what i've done, is from factory setting
> of 0 k to 21 kohms of actual potentiometer reading
> (full deflection to none for gas pedal), i've increase
> this value to 0 k up to 32 kohms, barely changing
> the actual full deflection of the pedals (only 3-5
> degrees more now). The main change as been done in
> the linkage, not the actual pedal deflection.

> These figures don't seem very big, but see this
> calculation (it's an example, not actual fact)

> For a full deflection (pedals) of 45 degrees,
> if i had 21 kOhms of "playability" for that given
> deflection; i've got 0.4666 k Omhs per degrees of
> travel.

> Now with my modification, a deflection
> of 45 degrees with 32 kOhms will translate in
> 0.711 k Ohms per degrees of travel.

> This modification is not an easy task, and some
> precaution have to be made ("zeroing" the pots)
> and worse make sure you don't create stress on
> the potentiometer shaft. " (end of CC)

> So that's my theories, i will make a special section about
> this issue on my website, i will post this when it will be ready, already
> have aggreements with Trevor Thomas.

> > However, it
> > would appear that the program has an option which fixes the problem. If you
> > press "Configure", then the "Controllers" tab (leading to the joystick
> > setup), there is a button you can press which looks like a target. This
> > leads you to another screen which allows you to adjust the sensitivity of
> > steering, brake and acceleration. In addition, below these is the option of
> > "Steering limit" which is on by default. When you switch it to OFF, the
> > front end no longer seems to push badly when using large locks, rather the
> > front end grip is maintained even though the wheels are starting to scrub.
> > Hence, the understeer problem is eliminated. In other words, once maximum
> > grip is reached, that grip is (at least largely) maintained with larger slip
> > angles (similar to GP2) so that you don't have to magically judge the right
> > amount of wheel lock to use for each turn.

> > Have I misinterpreted what this switch is intended for, or are people not
> > aware of its effects???

> Regarding this, i agree with you, take care, Eric

> > Regards,

> > Dennis.

>   ------------------------------------------------------------------------


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