rec.autos.simulators

Fast laps in GPL

Dave Hawn

Fast laps in GPL

by Dave Hawn » Thu, 28 Jan 1999 04:00:00




> >You think that's good? I've done 0:04.53 at Rouen - beat that :-)
> >Ok, I confess, I was using warp drive :-)

> Rouen's the only track that I've done a warp-speed lap at... 2.14 seconds!

H'mmm, the dreaded 'warp'... I got lap time at Monza 1m26.... I thought I was
really getting good, I saved the replay of the lap, not totally convinced I
had picked up 3 seconds form my normal lap times..... I thought I would be
honest with myself and time the replay with a stopwatch.... yup, you guessed
it... a 1m29... I was just fooling/warping my ego!  ;-)
Dave Hawnt (UK)
Dave Hawn

Fast laps in GPL

by Dave Hawn » Thu, 28 Jan 1999 04:00:00


> A buddy of mine is having trouble with a T2 in ICR2 -- it steers in the
> opposite direction.  I tried recalibrating it with him, but that didn't help.

> Any ideas?

> Thanks

> Kurt

H'mm, If I remember, you must steer LEFT first when the calibration screen
comes up...!  Make sure you calibrate in W95 first if you use that OS.....
If all else fails, remove the calibration setup file in ICR2 , can't remember its
file name, but you may need the sim to seek your wheel out again for
calibration!  Hope this helps....
Dave Hawnt (UK)
XRaceTr

Fast laps in GPL

by XRaceTr » Thu, 28 Jan 1999 04:00:00


>H'mm, If I remember, you must steer LEFT first when the calibration screen
>comes up...!

Close, but not exactly right... you have to steer left first
in the SET CONTROLS screen, not the calibration screen...

- m.

============================================
     Mike Holthouse - Indianapolis, IN
        Drop the "X" to e-mail me.
============================================

Bart Westr

Fast laps in GPL

by Bart Westr » Thu, 28 Jan 1999 04:00:00




>>Okay, let's figure it out:
>>Let's compare two drivers accelerating out of a 100mph curve on a long
>>straight, topping out at 200mph, but the slower guy is on the gas 50
>>meters later.
>>If both are accelerating the same way (the two acceleration curves are
>>50 meters apart, no wheelspin, same car and setup) the difference is
>>that the slow guy is cruising the first 50 meters at the beginning at
>>100mph (1.125sec), while the fast pilot is speeding 'his' 50 meters at
>>200mph at the end of the straight. The difference is only 0.56 seconds
>>which is IMHO not much compared to the 50 meters (or more than 10
>>lenghts of a car, or 1.125sec) which the slow driver hesitates before
>>he dares to move his right foot.

>This is where you're probably mistaken. The two 'accelerating curves'
>won't stay 50m apart through the acceleration. The distance will
>grow with time. This comes from the fact that the guy starting
>to accelerate earlier has a higher speed at any point and time
>on the straight where he's accelerating than the guy starting
>50m later. So at the end of the straight your 50m will
>have grown to, say 70m or a 100m.

>This is why it always feels difficult to overtake another car when
>accelerating out from a corner. The other car will always seem to pull
>impossibly away. The only way to pass a car is by either drafting
>or leaving enough room before the exit of the turn so that you can
>get on the gas earlier when coming out. Actually a combination of both
>would seem to be most effective :) This is why when 'defending' your
>position it is a good idea to slow down excessivly in a corner so that
>the car behind you failes to get the needed room he needs to get
>on the gas earlier. I.e. he's so close to you that he has to
>wait for you to start accelerating _first_ before he can
>start accelerating.

><snip>
>Regards,
>  Casper

You make a mistake here I think. The distance between the cars grows, at the
same time the speed of the cars increases, as a result the time difference
remains the same (if they accelerate at the same rate on every point of the
track).
The explanation must be that the faster driver has started to accelerate
earlier. If he did this from a lower cornering speed, it looks like the
drivers are leaving the corner at the same speed. But the faster one has a
greater acceleration, and will be faster on the straight until approaching
top speed.

Regards,
Bart Westra

ymenar

Fast laps in GPL

by ymenar » Thu, 28 Jan 1999 04:00:00

Ian Lake wrote

Or just watch the movie Grand Prix at the start at Monaco.

You can clearly see the racing groove almost all around the dark. It's very
nice (of course that movie rules for racing sequences).

Zandvoort from Nine days in the summer also has a dark groove IIRC.

and the Ring also, but the Ring has a very unsmooth texture to the track.  I
figure it's a limitation of the GPL graphic engine with the track texture.
That would be really incredible to actually have a realistic feeling to the
track texture (not the same one for 24km).

-= Fran?ois Mnard <ymenard/Nas-Frank>
-= NROS Nascar sanctioned Guide http://www.nros.com/
-= SimRacing Online http://www.simracing.com/
-= Official mentally retarded guy of r.a.s.
-= May the Downforce be with you...

"People think it must be fun to be a super genius, but they don't realise
how hard it is to put up with all the idiots in the world."

Tadej Krev

Fast laps in GPL

by Tadej Krev » Thu, 28 Jan 1999 04:00:00

I meant FineTune it :o)

I get very small calibration space and that can be fixed with hacking the
registry.
Contact PDPI for help, or ask around here. I'm going to try it out when I get
home on Thursday. I'm also expecting new pots :o)

Tadej


> On Mon, 25 Jan 1999 22:02:20 +0100, "Tadej Krevh"

> >Yeah, unbeliavable.
> >But I think once I get my PDPI settled (it still needs some fine tunning)
>  Tune your PDPI?? How? I'd loveto tune my PDPI.
> Sam

Tadej Krev

Fast laps in GPL

by Tadej Krev » Thu, 28 Jan 1999 04:00:00

Yeah, probably :o)
But I already have at least some 700 laps done there ;o)

Yeah, I'll try it out :o)I did that in GP2 though...

Yeah, you're crazy ;o))
I mean, how on earth could you do that without flat-shifting ??
Although one shouldn't trust too much to online times (I did once 1.27.15 and
Sasa 1.26.90) :o)

What do you think you gained most over W.Woeger's lap ?
Parabolica, Lesmo1, Lesmo2 or Curva Grande ? I doubt it could be Ascari :o)

ce'ya
Tadej Krevh

Matthias Fla

Fast laps in GPL

by Matthias Fla » Thu, 28 Jan 1999 04:00:00



I meant the beginning of the acceleration. What distances the cars
have during the acceleration time/distance does not matter.

Well, 100m is a good guess, but you forget that in this example, the
cars were not 50m apart at the beginning, but side by side. The
overall gain of early acceleration is, as I figured out, 50m.

As you did not understand my example the way I intended, I'll explain
it again: Let's say a single driver travels at 100mph, then
accelerates somehow within a mile to 200 mph, then continues at 200


difference in the time needed.
With that example, the 1.1sec or 50m acceleration delay at 100mph of
the slower driver/driving leeds to only 0.5 sec or 50m disadvantage
compared to the fast driver/driving.

BTW: I think the effect of seeing a growing/shrinking distance to the
car ahead is called "*** band effect", because the time gap between
two cars stays roughly the same, but speeds and thus distances vary.

--
   _____
 /_______\              .\\ a t t h e a d
I  XT /~~~~                    
I  500\_____       1977' Yamaha XT.Rex 500 Enduro
 \____/\__I_I      http://www.racesimcentral.net/

Matthias Fla

Fast laps in GPL

by Matthias Fla » Thu, 28 Jan 1999 04:00:00



I think any modern software should take this into consideration, and
leave some "space" at idle and full throttle, especially when the
signal is shakier than any nervous human foot can be.

In GP2, it was possible to check whether you reached 100% throttle, or
not. In GPL, you have to guess.

--
   _____
 /_______\              .\\ a t t h e a d
I  XT /~~~~                    
I  500\_____       1977' Yamaha XT.Rex 500 Enduro
 \____/\__I_I      http://matthead.home.pages.de/

Ian La

Fast laps in GPL

by Ian La » Thu, 28 Jan 1999 04:00:00

On Wed, 27 Jan 1999 11:24:36 +0100, Tadej Krevh


>> >and
>> >replace the pots I should be in the magic 1.26 at Monza :o))

>> It's possible. But it will take hours to get I believe. My 1m27s09
>> took around 2 hours, so to get into the 26's is going to take many
>> more.

>Yeah, probably :o)
>But I already have at least some 700 laps done there ;o)

yikes! I think I would be closer to 350. I don't particulary like the
track, so I don't practice it much.

In qualifying for race 1 I did 4 laps under wolfi's qual time time of
1m27s45, best being 1m27s29. For race 2 in qual I managed 3 good laps
being, 1m27s31, 1m27s29, 1m27s17 (just checked, wasn't 16 after all :)

All weren't using flat-shifting :)

In hotlapping, I really don't think flatshifting makes any difference
to normal lifting on gear changes. Just depends how well you can lift,
and how consistant you are. I rarely blow a lotus engine nowadays :)

Though, in hotlapping it's easier to just keep it floored.

Yeah, probably 1 out every 50 laps you will have a warp lap where you
can't be sure weather you did that time or not.

Actually I have no idea. I watched his lap once to see where the lines
where, then I went out and hotlapped, making adjustments to what I
believe was a faster line.

In general, the secret to a good lap at monza is getting parabolica
down pat. You can lose almost 1/2 a second on this corner alone from a
good to great lap.

Ian

John Walla

Fast laps in GPL

by John Walla » Thu, 28 Jan 1999 04:00:00



Which is just as it was in real life when comparing 1994 F1 to 1967
F1.

Cheers!
John

Matthias Fla

Fast laps in GPL

by Matthias Fla » Thu, 28 Jan 1999 04:00:00



>>In GP2, it was possible to check whether you reached 100% throttle, or
>>not. In GPL, you have to guess.
>Which is just as it was in real life when comparing 1994 F1 to 1967
>F1.

No. Such simple things don't need electronic data recording.

After I bought a used motorbike and got a horsepower test, I looked
into the carb in search for the missing hp and found that the throttle
did not open completely. But I confess, that was in the 80s.

--
   _____
 /_______\              .\\ a t t h e a d
I  XT /~~~~                    
I  500\_____       1977' Yamaha XT.Rex 500 Enduro
 \____/\__I_I      http://matthead.home.pages.de/

Casper Gripenbe

Fast laps in GPL

by Casper Gripenbe » Thu, 28 Jan 1999 04:00:00



>As you did not understand my example the way I intended, I'll explain
>it again: Let's say a single driver travels at 100mph, then
>accelerates somehow within a mile to 200 mph, then continues at 200


>difference in the time needed.
>With that example, the 1.1sec or 50m acceleration delay at 100mph of
>the slower driver/driving leeds to only 0.5 sec or 50m disadvantage
>compared to the fast driver/driving.

I don't know where my previous posting disappeared. In fact I
hope it disappeared since it's probably not correct either :)
But just for fun I made an excel sheet where you can try out
different values and see the result.

http://www.hut.fi/~casper/floorit.xls

I hope I remembered the old formulas right. The sheet does
not take braking into account, but I don't think the end
result would be that much different...

Now start checking your Monza times with excel sheets and
let's see those lap times come down ;)

Regards,
  Casper

Bart Westr

Fast laps in GPL

by Bart Westr » Thu, 28 Jan 1999 04:00:00

Sorry for the long post, but it is all relevant. See my addition at the
bottom.





>>>Okay, let's figure it out:
>>>Let's compare two drivers accelerating out of a 100mph curve on a long
>>>straight, topping out at 200mph, but the slower guy is on the gas 50
>>>meters later.
>>>If both are accelerating the same way (the two acceleration curves are
>>>50 meters apart, no wheelspin, same car and setup) the difference is
>>>that the slow guy is cruising the first 50 meters at the beginning at
>>>100mph (1.125sec), while the fast pilot is speeding 'his' 50 meters at
>>>200mph at the end of the straight. The difference is only 0.56 seconds
>>>which is IMHO not much compared to the 50 meters (or more than 10
>>>lenghts of a car, or 1.125sec) which the slow driver hesitates before
>>>he dares to move his right foot.

>>This is where you're probably mistaken. The two 'accelerating curves'
>>won't stay 50m apart through the acceleration. The distance will
>>grow with time. This comes from the fact that the guy starting
>>to accelerate earlier has a higher speed at any point and time
>>on the straight where he's accelerating than the guy starting
>>50m later. So at the end of the straight your 50m will
>>have grown to, say 70m or a 100m.

>>This is why it always feels difficult to overtake another car when
>>accelerating out from a corner. The other car will always seem to pull
>>impossibly away. The only way to pass a car is by either drafting
>>or leaving enough room before the exit of the turn so that you can
>>get on the gas earlier when coming out. Actually a combination of both
>>would seem to be most effective :) This is why when 'defending' your
>>position it is a good idea to slow down excessivly in a corner so that
>>the car behind you failes to get the needed room he needs to get
>>on the gas earlier. I.e. he's so close to you that he has to
>>wait for you to start accelerating _first_ before he can
>>start accelerating.

>><snip>
>>Regards,
>>  Casper

>You make a mistake here I think. The distance between the cars grows, at
the
>same time the speed of the cars increases, as a result the time difference
>remains the same (if they accelerate at the same rate on every point of the
>track).
>The explanation must be that the faster driver has started to accelerate
>earlier. If he did this from a lower cornering speed, it looks like the
>drivers are leaving the corner at the same speed. But the faster one has a
>greater acceleration, and will be faster on the straight until approaching
>top speed.

>Regards,
>Bart Westra

I should not reply early in the morning, I stumbled over the same hurdle
here! The big advantage does not come from starting to accelerate a bit
earlier, as Matthias has already pointed out. For the same reason, braking a
bit later does not gain great amounts of time either.
I believe it is the rate at which a fast driver can accelerate. Acceleration
like speed has to be build up. Pointing the car better, maintaining optimal
traction, that sort of thing. This would account for a bigger time advantage
then in the situation where the rate of acceleration is the same. The speed
difference would continue to increase until sheer speed itself puts a limit
on how fast the car can accelerate. You can see the effect of what I mean
best in standing starts. Some drivers take off so easily (seemingly); one
who gets wheel spin or is too careful is way behind immediately (both in
distance and in time).
Hope I made myself clear.

Regards,
Bart Westra

- Show quoted text -

John Walla

Fast laps in GPL

by John Walla » Thu, 28 Jan 1999 04:00:00





>>>In GP2, it was possible to check whether you reached 100% throttle, or
>>>not. In GPL, you have to guess.

>>Which is just as it was in real life when comparing 1994 F1 to 1967
>>F1.

>No. Such simple things don't need electronic data recording.

Whether they need them or not, in 1994 these things could be
electronically confirmed with 100% certainty (fly by wire throttle
after all) and in 1967 they could not. This is true at any time you
feel power may be down (even during a race), not only when the car is
stripped and in the garage.

This is consistent with real life, which is the point I was making.

Cheers!
John


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