>I must have missed the front end of this thread.
>Where can I find, or rather download the Nunnini setups?
>Thanks,
>Ruud van Gaal
<remove 7of9 for e-mail replies>
--
Bill Jones e-mail addresses:
(860) 701-1201 WWW: http://www.racesimcentral.net/
People have overlooked entirely the differential and how it affects the handling
of the cars in GPL. 85/30 and 85/45 seem to be most pre*** settings and is
in fact a large contrigbutor to how much the car will understeer.
Carrol Smith has an excellent description (as well as diagrams) of how clutch
pack diffs. operate in his book "Drive to Win",
and also talks about what settings he generally uses.
Here is an excerpt from Drive to Win:
"For faster corners with more download some teams use 60/30 ramps. I have never
been happy with 45/45 (too much corner entry and mid-phase understeer) but I
know some very successfull people who are - in the UK. I don't know anyone who
likes them in slow corners or on bumpy courses. Personally I cannot conceive of
using any ramp of less than 80 degrees on the coast side."
He goes on to say:
"The most common misconception with these units is that the amount of preload on
the clutch plates is a primary determining factor of the amount of lock up. It
can be, but it is better if it is not. The spreading force of the bevel gears is
an order of magnitude greater than any conceiveable preload."
He also mentions that his personal choices are 45/85 or 80/80 with little or no
preload and that the latter is a very benign setup if there are no really slow
hairpins or not much available torque.
I've been actively using 45/85 with 1 clutch with some degree of success on the
Brabham at 4 + in. of ride height. I find that while it has a tendency towards
trailing throttle oversteer, this can be compensated for by liberal usage of
trail braking and being carefull not to take your foot of the accelerator too
abrutptly. In fact it requires smoothness in regards to the transition from full
throttle to neutral throttle. It also requires a different approach to springs
and roll bars.
I could go on in great depth about what I've learned (or think I've learned) but
I'm not sure that it would be welcomed as I am not one of the faster drivers of
GPL. Nonetheless I do believe that limiting oneself to relatively low ride
heights (2.5-3.5) and diff settings that are appearantly not recommended (i.e.
85/30 in particular) even though they appear to be the fastest with regard to
the limitations of the physics engine, is a mistake. GPL may be the most
advanced physics engine ever put into a sim, but its potential is vastly
unexplored.
Some of my fast laps with the Brabham and a 45/85
Kyalami 1:21.50
Brands Hatch 1:36.50
Monaco 1:28.30
Not world class I know, but still faster than I ever was at 2.5 with an 85/30.
The faster guys could probably do better, but I doubt they'll ever try.
--
Tony Whitley
