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GTR: You must be kidding me



 
 
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  #51  
Old December 23rd 05, 11:21 PM posted to rec.autos.simulators
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Default GTR: You must be kidding me

> > http://www.green-flag.com/pages/welc...&id2=videomenu

>> Thats 'Sideways Stephan' and he does it just for show on the RUF videos


That explains it.

> Sideways is never fast. If the tires are at that slip angle,
> they ain't developing max cornering force, for sure.


If you look at actual lateral force versus slip angles there's
not much, if any loss in laterforce at higher slip angles, except
for the fact that tires get overheated. Avon is one company that
publishes this data, and Todd Watson, who has been working on
basic simulator physics, has done a lot of research on this
consulting experts, and there's little loss of grip at higher
slip angles, it's just the lateral force is not quite in the right
direction.

It also depends on tire contruction. IRL (Indy) cars have the
smallest "working slip" angle of about 2 degrees. F1 and Cart cars
are more like 2.5 to 3 degrees. Most non-downforce racing cars
wihtout tire restrictions will use bias ply slicks, with a slip
angle around 4 to 5 degrees.

> If the GTR cars weren't a lot less forgiving than GPL cars


Yes I agree with this, I feel that some aspects should be
compromised to make up for the lack of feedback. Traction control
is one way, and realistic, since it's used in FIA's F1 and GT1
classes. Champ cars don't use traction control, but looking
at videos of events at Laguna Seca and Brands Hatch, there are
a lot more incidents than in F1, maybe fun for the spectators,
but not the drivers and teams.



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  #52  
Old December 24th 05, 03:24 AM posted to rec.autos.simulators
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Default GTR: You must be kidding me

Getting back on topic. I still haven't seen an explanation
for why driver induced understeer barely works at all in GTR.

If GTR's physics model is implemented so that lateral force is
reduced at excessively high slip angles, then why doesn't
pegging the steering wheel induce a large amount of understeer?

Somethings up with the physics.

I've tested this in real life on a Trans-Am (front weight bias
car), and a Caterham (rear weight bias car), and it works well
on both cars. In addition, I've seen posts about this method
being used by many club and professional racers.



 




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