rec.autos.simulators

N4 - Has it been PROVEN that camber settings affect times?

Brian Carabe

N4 - Has it been PROVEN that camber settings affect times?

by Brian Carabe » Thu, 01 Mar 2001 14:26:41

I just thought of something - When camber is set for hotter inside temps, is
there an ACTUAL increase in performance in real terms? It sounds good on
paper, but has anyone factually determined that there is a difference? I'm
wondering if a neutral camber setup to eliminate the left pull would be just
as effective as the suggested setup.

Haven't had time yet to try it out.

Brian

drinklim

N4 - Has it been PROVEN that camber settings affect times?

by drinklim » Thu, 01 Mar 2001 16:52:07

I just raced a pocono and changing from -3.25 to -3.00 resulted in a bad
push and took a second off my times. Back to -3.25 and i was fine again.


Brian Carabe

N4 - Has it been PROVEN that camber settings affect times?

by Brian Carabe » Thu, 01 Mar 2001 16:53:51

Well I'll experiment and see what the different is. I'll be looking for that
push. I haven't driven for a few days because of my disgust with the robotic
AI.

Brian




> >I just thought of something - When camber is set for hotter inside temps,
is
> >there an ACTUAL increase in performance in real terms? It sounds good on
> >paper, but has anyone factually determined that there is a difference?
I'm
> >wondering if a neutral camber setup to eliminate the left pull would be
just
> >as effective as the suggested setup.

> On a short-medium length track, you are going to need that negative camber
> on the right-front. Set it to 0 and see. It will push like a very pushy
thing.. :)

Kevin Gavit

N4 - Has it been PROVEN that camber settings affect times?

by Kevin Gavit » Fri, 02 Mar 2001 00:38:09


A: Yes it has.

B: The camber isn't the cause of the "left pull." Asymetrical weight
balance, tire diameter, castor and toe are.

C: Since what you are trying to do is circle to the left as fast as possible
"left pull" is * desirable. *

Make this experiement, take a perfectly cylindrical object, like an oatmeal
box, and try to push it around a circular path.

Now do the same thing with a conical object, like a styrofoam coffee cup.

You will note a HUGE difference. The oatmeal box only has one single point
on its width at which it is simply following the circle. ALL other points on
the box are scrubbing against the surface. Your tires, a: don't like that,
b: are using up some of their potential for generating cornering forces.

You'll note that the slightest nudge of the coffee cup sends it cheerfully
rolling in circles.

Ask yourself THIS question. Why don't the set the camber of the banked
tracks to "nuetral."

KFG

Larr

N4 - Has it been PROVEN that camber settings affect times?

by Larr » Fri, 02 Mar 2001 01:18:55

Camber most certainly will affect the pull...  I've experimented with that
myself...

-Larry




> > I just thought of something - When camber is set for hotter inside
temps,
> is
> > there an ACTUAL increase in performance in real terms? It sounds good on
> > paper, but has anyone factually determined that there is a difference?
I'm
> > wondering if a neutral camber setup to eliminate the left pull would be
> just
> > as effective as the suggested setup.

> > Haven't had time yet to try it out.

> A: Yes it has.

> B: The camber isn't the cause of the "left pull." Asymetrical weight
> balance, tire diameter, castor and toe are.

> C: Since what you are trying to do is circle to the left as fast as
possible
> "left pull" is * desirable. *

> Make this experiement, take a perfectly cylindrical object, like an
oatmeal
> box, and try to push it around a circular path.

> Now do the same thing with a conical object, like a styrofoam coffee cup.

> You will note a HUGE difference. The oatmeal box only has one single point
> on its width at which it is simply following the circle. ALL other points
on
> the box are scrubbing against the surface. Your tires, a: don't like that,
> b: are using up some of their potential for generating cornering forces.

> You'll note that the slightest nudge of the coffee cup sends it cheerfully
> rolling in circles.

> Ask yourself THIS question. Why don't the set the camber of the banked
> tracks to "nuetral."

> KFG

Brian Carabe

N4 - Has it been PROVEN that camber settings affect times?

by Brian Carabe » Fri, 02 Mar 2001 02:21:59

Kevin,

Yes, I was trying to determine if the sim itself properly emulated the
real-world physics.

If that's true, then why does neutral camber track straight and positive
left and negative right track left?

Absolutely

There is another factor involved there - centrifugal force.

Glockenspie

N4 - Has it been PROVEN that camber settings affect times?

by Glockenspie » Fri, 02 Mar 2001 06:15:04

On Wed, 28 Feb 2001 15:38:09 GMT, "Kevin Gavitt"


>B: The camber isn't the cause of the "left pull." Asymetrical weight
>balance, tire diameter, castor and toe are.
>KFG

Actually, camber can cause a pull. And if your camber split is 3, 4, 5
degrees or more, it WILL cause a pull. All other variables being
equal, a vehicle will pull to the side with the most positive camber.
Thus, if you have +3.0 deg. on the LF and -3.0 deg. on the RF, that
6.0 deg split will most certainly cause a pull to the left.

Todd

GBB

N4 - Has it been PROVEN that camber settings affect times?

by GBB » Fri, 02 Mar 2001 07:50:34

I don't know where everybody has go the idea that asemetrical camber
settings cause the left pull, imo it is caused by asemetrical weight, wedge,
tyre pressure, ride hight and maybe caster settings but not the camber.

Also asemetrical camber settings will certanly improve performance on ovals.

Alex


Brian Carabe

N4 - Has it been PROVEN that camber settings affect times?

by Brian Carabe » Fri, 02 Mar 2001 09:42:49

If you start with the easy setup (which tracks straight) in the garage and
introduce positive left and negative right camber, the car will pull to the
left. Doesn't that prove that asymmetrical camber settings pull to the left?

Brian


> I don't know where everybody has go the idea that asemetrical camber
> settings cause the left pull, imo it is caused by asemetrical weight,
wedge,
> tyre pressure, ride hight and maybe caster settings but not the camber.

> Also asemetrical camber settings will certanly improve performance on
ovals.

> Alex



> > I just thought of something - When camber is set for hotter inside
temps,
> is
> > there an ACTUAL increase in performance in real terms? It sounds good on
> > paper, but has anyone factually determined that there is a difference?
I'm
> > wondering if a neutral camber setup to eliminate the left pull would be
> just
> > as effective as the suggested setup.

> > Haven't had time yet to try it out.

> > Brian

edb

N4 - Has it been PROVEN that camber settings affect times?

by edb » Sat, 03 Mar 2001 03:37:58

Brian, I have followed your journey into N4 and have responded to some of
your posts regarding the "left pull" issue. I have an idea that may help you
out:

We agree that the pull is inherent to the setup.
We agree that the setup is what helps us get around ovals faster.
We agree in your situation (no FF I think) that the pull is apparently a
bigger issue than those with certain FF setups.

My suggestion is to go out at the track of your choice and practice with the
<fast> setup and after warming the tires up try this:
Imagine that straight forward steering is actually about 2-3 degress to the
right of center on your wheel.

My next door neighbor (friend, racing, fishing buddy) has a non FF wheel and
was bad struggling with the  isuue like yourself and I told him this tip and
it helped him get through ok, seemed thinking that actually made it easier
to wrap his mind around the concept. Now that we have tackled that, we have
begun adjusting the settings in our cars, which brings up the next issue===>

As you begin to play with springs (especially, but not exclusively) we have
begun to notice that the effect is greatly noticable under acceleration,
coasting, and braking. That is, with certain setups you better let off the
wheel when you let off the gas because the right bias you're giving your
steering wheel is no longer needed the instant you lift and you're turning
right! We've noticed this more with non "stock" setups. I can't remember
where I read the hint, but the docs mention certain settings affect the car
differently under acceleration and under braking.

Try here, look under Nascar 4 from the left menu and look at the setup guide
(be advised ita about 70 pages long), it is a great insight into the
parameters into setting up the cars in N4. http://www.sascar.com (No I'm not
a member of this site, but was put onto it about a week ago, d'loaded the
guide and have found it very, very insightful as to what to look for when
tweaking setups)

Best of luck to ya, hope to see you on the track sometime,

edb


Brian Carabe

N4 - Has it been PROVEN that camber settings affect times?

by Brian Carabe » Sat, 03 Mar 2001 13:33:23

Good thoughts, there, edb. I've come to realize that part of the problem is
the very strong tendency for my wheel to return to center. Those bungees are
pretty tight, and that causes an unnaturally forceful centering of the
wheel. I therefore tend to over-compensate based on the sensation of the
wheel "popping" back to center. When I purposely try to ignore that
sensation, I do better, but it is hard to maintain.

In addition, you're right about easing off the accelerator going into
turns - the car veers to the right. I thought I was the only one who was
experiencing this. Your explanation makes sense.

Bottom line - The only way I'm going to really enjoy this sim is by getting
a better wheel and, oh, yes, by downloading Papy's patch which will turn
those killer robots into civilized drivers.

Thanks for your suggestions.

Brian


> Brian, I have followed your journey into N4 and have responded to some of
> your posts regarding the "left pull" issue. I have an idea that may help
you
> out:

> We agree that the pull is inherent to the setup.
> We agree that the setup is what helps us get around ovals faster.
> We agree in your situation (no FF I think) that the pull is apparently a
> bigger issue than those with certain FF setups.

> My suggestion is to go out at the track of your choice and practice with
the
> <fast> setup and after warming the tires up try this:
> Imagine that straight forward steering is actually about 2-3 degress to
the
> right of center on your wheel.

> My next door neighbor (friend, racing, fishing buddy) has a non FF wheel
and
> was bad struggling with the  isuue like yourself and I told him this tip
and
> it helped him get through ok, seemed thinking that actually made it easier
> to wrap his mind around the concept. Now that we have tackled that, we
have
> begun adjusting the settings in our cars, which brings up the next
issue===>

> As you begin to play with springs (especially, but not exclusively) we
have
> begun to notice that the effect is greatly noticable under acceleration,
> coasting, and braking. That is, with certain setups you better let off the
> wheel when you let off the gas because the right bias you're giving your
> steering wheel is no longer needed the instant you lift and you're turning
> right! We've noticed this more with non "stock" setups. I can't remember
> where I read the hint, but the docs mention certain settings affect the
car
> differently under acceleration and under braking.

> Try here, look under Nascar 4 from the left menu and look at the setup
guide
> (be advised ita about 70 pages long), it is a great insight into the
> parameters into setting up the cars in N4. http://www.sascar.com (No I'm
not
> a member of this site, but was put onto it about a week ago, d'loaded the
> guide and have found it very, very insightful as to what to look for when
> tweaking setups)

> Best of luck to ya, hope to see you on the track sometime,

> edb



> > I just thought of something - When camber is set for hotter inside
temps,
> is
> > there an ACTUAL increase in performance in real terms? It sounds good on
> > paper, but has anyone factually determined that there is a difference?
I'm
> > wondering if a neutral camber setup to eliminate the left pull would be
> just
> > as effective as the suggested setup.

> > Haven't had time yet to try it out.

> > Brian

Phaso

N4 - Has it been PROVEN that camber settings affect times?

by Phaso » Thu, 08 Mar 2001 09:31:29

Definately.  Camber IMHO is the biggest single influence to car performance.
I made some very surprising discoveries at the restrictor-plate tracks...

    -Phasor




> >I just thought of something - When camber is set for hotter inside temps,
is
> >there an ACTUAL increase in performance in real terms? It sounds good on
> >paper, but has anyone factually determined that there is a difference?
I'm
> >wondering if a neutral camber setup to eliminate the left pull would be
just
> >as effective as the suggested setup.

> On a short-medium length track, you are going to need that negative camber
> on the right-front. Set it to 0 and see. It will push like a very pushy
thing.. :)


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