[DeTomaso] steering wheel diameter

boyd casey boyd411 at gmail.com
Sat Sep 25 12:00:45 EDT 2010


If you look at my wheel diameters the car is set up to be higher in the rear
and lower in the front to give the car a downward rake which is supposed to
help eliminate the problem of front lift.
I also have venting that is supposed eliminate or reduce front lift.  I have
plans to modify the active aerodynamics which is supposed to eliminate the
front lift issue.
My plans were for a functional front air dame. A functional  and adjustable
rear spoiler that is supposed to actually create substantial down force and
some under car active aeros that will smooth out the airflow under the
car,reduce lift  and a diffuser to improve the overall aero dynamics and
reduce or  come close to eliminating lift emanating from under the car.

Hugh

On Sat, Sep 25, 2010 at 11:46 AM, <JJD1010 at aol.com> wrote:

> Torque = Radius x Force
>
> So Force you feel at the wheel = Torque / Radius.
>
> Going from a 13 to 14 inch wheel would make an 8% difference. Doesn't sound
>  very significant to me.
>
> Specifically, what kind of stability issues are you experiencing?
>
> Don't forget the aerodynamics of the car cause the front end get  a lighter
> as the speed goes up unless you have a good front air dam.
>
>
> Jeff
> 6559
>
>
> In a message dated 9/25/2010 9:04:25 A.M. Central Daylight Time,
> boyd411 at gmail.com writes:
>
> I first  started with 5 % degrees ( after my johnny woods modification) but
> I
> didn't  get the high speed stability I expected. With all new  suspension
> components, new Konis shocks, new sphere ball sway bar ends  and  new
> wheels
> and tires ( with good handling "Nitto NT-05 235xZR18 x  9 (front )effective
> diameter of 25.43" and width of 9.57" and 335/30/  ZR19  ( rear)  26.89"
> and
> width of 13.31") they have one of the  best ratings for dry performance
> with
> performance rateings of W, UTOG  treadware at 200 traction at AA and temp
> at
> A. diameter and characteristics  and set up for low center of gravity I
> expected a much more stable high  speed driving expierienece. The all The
> alignment specs camie in at or  better then expected. The only thing I
> couls
> still think of was the small  diameter steering whell (as I said a fraction
> over 13" with the leather  wrap) makes me feel that My steering wheel
> movements ( especially at speed)  are having an exagerated effect on my
> steering input and making the car  feel skitisch. Does this sound logical
> or
> make sense? I remember my NSX at  150 mph felt like it was on rails ( as
> long
> as the windows were closed) I  havent had the pantera over 110 Mph ( due to
> no appropriate place to drive  it safely (or legally at that speed ) and I
> don't feel at all confident in  the stabilty or controll at this speed even
> driving in a relative straight  line. It gives m pause for concern when I
> factor in the prospect of driving  a course with turns at theses type of
> speeds ( or ideally faster) Has  anyone got any advice or practical input
> or
> opinions? By the way my rack is  good  and I don't appear to be suffering
> from any bumpsteer of any  significance. I am really inclined to believe
> this
> is a result of the  steering wheel diameter.
> Boyd
>
> On Sat, Sep 25, 2010 at 1:48 AM,  <MikeLDrew at aol.com> wrote:
>
> >
> > In a message dated  9/24/10 21 22 14, boyd411 at gmail.com writes:
> >
> >
> > I didn't  mind it until I modified my caster to 6.5 degrees.It makes
> parking
> >  lots and three point turns tough.
> >
> >
> > That's what too much  caster does.  6.5 degrees is really excessive.
> >
> >  Mike
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