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Rec.Autos.Simulators Archive

GPL Steer ratio and calib values

19 posts by 11 people · 05 Oct 1998 - 14 Oct 1998

rob 05 Oct 1998#424872
There's just no way the car would be driveable if you were using a button for throttle and every time you pushed it the throttle went on full. I don't think he means traction control is mandatory with a 'digital proportional' throttle, as in, a variable throttle implemented digitally. He's referring to an on/off button setup for throttle. rob.
Quoted text (17 lines)>> You could spin the rear tires and snake your way out, but that's not an >option > >when traction control is enabled, and traction control is mandatory when >using a > >digital throttle. >Traction control mandatory w/ digital throttle?? >Is this a bad joke or is it just me - that dont get the point?? >Please explain Randy. >All the best, >Edwin Solheim >REMOVE SPAM-GUARD IN ADDRESS TO REPLY! >Check out "The Paddock - a legendary site..." for >some cool GPL-stuff!! >[http://home.c2i.net/thepaddock
1) Is it my imagination or does the steer ratio not make any difference? Try it yourself; set steer ratio to the max, go out to the track and, while stopped in the pits, look at the angle of the wheels at max lock, then set steer ratio to min and look at the wheels at max lock. I swear they are the same! If I am right on this it is certainly a major bug. 2) Does anyone know where in the program the calibration values are? Im talking about hex editing here. In ICR2 there was a calib.val file in the main directory, and in GP2 they were in the f1gstate.sav file at the top. I would REALLY like to know where these are in gpl so I can edit my wheel lock to less that way. one of these two ways I have to get my lock down, turning my wheel a slight 10-15 deg makes a turn (way to twichy!), but I want to have to go at least 45-60 deg as in other sims on most turns and 100-110 deg for the hairpins p.s. I have already played around with the sensivity slider, that is not the answer p.p.s. the wheel lock in the demo was small enough, if only I could get the final to feel like that it would be good! Thankyou for any answers u can provide! L8er
Eric Busch 06 Oct 1998#425224
Remember in GPL you are controlling the steering ratio, not wheel lock. The front wheels will always have the same maximum lock, what's actually changing is how much steering input is needed to get there (lower numbers will give tighter, more responsive steering). - Eric
> Remember in GPL you are controlling the steering ratio, not wheel > lock. > The front wheels will always have the same maximum lock, what's > actually > changing is how much steering input is needed to get there (lower > numbers will give tighter, more responsive steering). are u sure about this eric? it should do both. Think about it - if the steer ratio is 12:1 that means 12 deg of turn on the steering wheel is 1 deg of turn on the front wheels >>> 20:1 means 20 deg of turn on the steering wheel is 1 deg of turn on the front wheels so . . . if u have 12:1 and turn the wheel 170 deg (the max lock of the "extra arms and wheel") then the front wheels should turn 14 .166 deg (170/12) if u have 20:1 and turn the wheel 170 deg (the max lock of the "extra arms and wheel") then the front wheels should trun 8.5 deg (170/20) so the max lock with 12:1 should be 14.166 deg and the max lock with 20:1 should be 8.5 deg is this not correct? lock anyway!!??
The steering ratio while stopped is the same for all cars, regardless of the value specified on the setup sheet (and it's much lower than you can select in the garage). It's impossible to get out of the pits at some tracks with a reasonable steering ratio. You could spin the rear tires and snake your way out, but that's not an option when traction control is enabled, and traction control is mandatory when using a digital throttle. Try the same experiment with a twist. Blast down the front straight at Monza at speed. Mash the brakes so that the front wheels lock up (so that your car continues straight down the track when you perform the next step). Turn the wheel to either lock. Adjust your steering ratio and try the same thing again. You'll find that the steering ratio setting is, indeed, functional. Randy
Eric Busch 06 Oct 1998#425227
It does do both, but for your example of being stopped in the pits the steering ratio you've chosen is thrown out the window and you are given a preset maximum lock (I should have mentioned that, sorry). While at speed however, the normal ratio/lock relationship you'd expect is working properly. - Eric
Set it at a low number and then try to drive through the hairpins at Monaco...you'll see it has a dramatic effect. Marc. >1) Is it my imagination or does the steer ratio not make any >difference? Try it yourself; set steer ratio to the max, go out to the >track and, while stopped in the pits, look at the angle of the wheels at >max lock, then set steer ratio to min and look at the wheels at max >lock. I swear they are the same! If I am right on this it is certainly >a major bug.
My impression is that the amount of wheel turn shown on screen doesn't necessarily relate to how much wheel turn you're actually steering. What you see is often less than what you're driving. Now of course the car drives according to how much you steer, regardless of what you see. Its just that the visuals don't seem to animate the full range of steering lock. In fact the visuals only seem to depict about 10 or 20 degrees of lock regardless of whether you're steering a much greater lock. I can only speculate the reason for this is the increased animation requirements for showing greater locks. Although you'd think that in a sim where so many other things are taken to the maximum degree of realism so would the visual impression of steering locks. Bye Phillip McNelley
>The steering ratio while stopped is the same for all cars, regardless of >the value specified on the setup sheet (and it's much lower than you can >select in the garage). It's impossible to get out of the pits at some >tracks with a reasonable steering ratio. You could spin the rear tires and >snake your way out, but that's not an option when traction control is >enabled, and traction control is mandatory when using a digital throttle. Neat. I always had a problem in GP2 exiting the pits in Spa with my favourite setup. I just couldn't make the car turn enough to get through the La Source pit exit. Really, I like it. One more nice detail in GPL. -- Wolfgang Preiss \ E-mail copies of replies to this posting are welcome.
> You could spin the rear tires and snake your way out, but that's not an option >when traction control is enabled, and traction control is mandatory when using a >digital throttle. Traction control mandatory w/ digital throttle?? Is this a bad joke or is it just me - that dont get the point?? Please explain Randy. All the best, Edwin Solheim REMOVE SPAM-GUARD IN ADDRESS TO REPLY! Check out "The Paddock - a legendary site..." for some cool GPL-stuff!! [http://home.c2i.net/thepaddock)
Pat Dotson 07 Oct 1998#425519
> Try the same experiment with a twist. Blast down the front straight at > Monza at speed. Mash the brakes so that the front wheels lock up (so that > your car continues straight down the track when you perform the next step). > Turn the wheel to either lock. Adjust your steering ratio and try the > same thing again. You'll find that the steering ratio setting is, indeed, > functional. I noticed something else about the steering. Going into a tight hairpin, if you turn the wheel all the way to the stops, the front wheels don't immediately turn completely. If fact, as you slow down they turn more, and if you speed up a bit, they will turn even less. It's almost as if GPL sees the wheel position of the sim-driver not as a true position, but as a measure of force being applied to the virtual steering wheel. Maybe it relates to the low-speed behaviour you mentioned that is used in the pits, but I would like to understand it better. Would you care to comment on that Randy? -- Pat Dotson IMPACT Motorsports http://www.impactmotorsports.com/pd.html
P Gagg 09 Oct 1998#426053
Quoted text (19 lines)> > Try the same experiment with a twist. Blast down the front > > straight at > > Monza at speed. Mash the brakes so that the front wheels lock up > > (so that > > your car continues straight down the track when you perform the > > next step). > > Turn the wheel to either lock. Adjust your steering ratio and > > try the > > same thing again. You'll find that the steering ratio setting > > is, indeed, > > functional. > I noticed something else about the steering. Going into a tight > hairpin, > if you turn the wheel all the way to the stops, the front wheels > don't > immediately turn completely. If fact, as you slow down they turn > more, > and if you speed up a bit, they will turn even less. It's almost
as
Quoted text (11 lines)> if GPL sees the wheel position of the sim-driver not as a true > position, > but as a measure of force being applied to the virtual steering > wheel. > Maybe it relates to the low-speed behaviour you mentioned that is > used > in the pits, but I would like to understand it better. Would you > care > to > comment on that Randy?
Its called steering with the throttle..... To check it out, drive around a long radius bend, say Monza Curva parabolioca, try to keep the steering wheel still at the same angle, but gradually increase or decrease the throttle, and the car will turn in, or turn out as the throttle varies. 8-) *Peter* 8-) (NB: remove asterix to e-mail)
Pat Dotson 09 Oct 1998#426054
Quoted text (12 lines)> > I noticed something else about the steering. Going into a tight > > hairpin, > > if you turn the wheel all the way to the stops, the front wheels > > don't > > immediately turn completely. If fact, as you slow down they turn > Its called steering with the throttle..... > To check it out, drive around a long radius bend, say Monza Curva > parabolioca, try to keep the steering wheel still at the same angle, > but gradually increase or decrease the throttle, and the car will > turn in, or turn out as the throttle varies.
I said, "tight hairpin", which implies a very slow first gear turn where the car is barely moving. There is one of this type at Mexico, T5R at Rouen is another, and there are maybe a few more at other tracks. -- Pat Dotson IMPACT Motorsports http://www.impactmotorsports.com/pd.html
On Wed, 7 Oct 1998 17:35:15 +0200, "Edwin Solheim" >Traction control mandatory w/ digital throttle?? >Is this a bad joke or is it just me - that dont get the point?? Can you honestly imagine trying to drive when your throttle is either off or at 100%? Try it tonight then report back with your results... Cheers! John
Thank God!! It was just me.. that didnt get the point! :) I misinterpid the "digital throttle" part... All the best, Edwin Solheim REMOVE SPAM-GUARD IN ADDRESS TO REPLY! Check out "The Paddock - a legendary site..." for some cool GPL-stuff!! [http://home.c2i.net/thepaddock)
Quoted text (11 lines)>On Wed, 7 Oct 1998 17:35:15 +0200, "Edwin Solheim" >>Traction control mandatory w/ digital throttle?? >>Is this a bad joke or is it just me - that dont get the point?? >Can you honestly imagine trying to drive when your throttle is either >off or at 100%? Try it tonight then report back with your results... >Cheers! >John
> I noticed something else about the steering. Going into a tight > hairpin, if you turn the wheel all the way to the stops, the > front wheels don't immediately turn completely. If fact, as > you slow down they turn The "very fast steering ratio while stopped" ramps to the steering ratio you specify on the setup sheet at a medium-low speed (it can't just jump at a particular speed - step changes are horrible). So, yes, it generally does have an effect in hairpin corners. And, yes, this is by design. Randy
Pat Dotson 13 Oct 1998#427260
Quoted text (11 lines)> > I noticed something else about the steering. Going into a tight > > hairpin, if you turn the wheel all the way to the stops, the > > front wheels don't immediately turn completely. If fact, as > > you slow down they turn > The "very fast steering ratio while stopped" ramps to the steering ratio > you specify on the setup sheet at a medium-low speed (it can't just jump at > a particular speed - step changes are horrible). So, yes, it generally > does have an effect in hairpin corners. And, yes, this is by design. > Randy
It's a very good effect - well done. It's sort of a "reduce with speed" steering option, but one that operates at the other end of the speedometer. -- Pat Dotson IMPACT Motorsports http://www.impactmotorsports.com/pd.html
Pat Dotson 14 Oct 1998#427609
> >It's sort of a > >"reduce with speed" steering option, but one that operates > >at the other end of the speedometer. > Is that an "increase with slowness" feature then? You tell me. I guess it's not really an option though because you can't change it. It should be a standard feature for sims though. -- Pat Dotson IMPACT Motorsports http://www.impactmotorsports.com/pd.html
Pat Dotson 14 Oct 1998#427610
Quoted text (11 lines)> > It should be a standard feature for sims though. > Yep, although hopefully FF will soon mature to the point where this sort of > feature is no longer required. > Cheers, > Richard > -- > We all bump into each other every day of our lives, and we render our opinions > whether we know anything or not, and if anybody catches us out we lie...
I sure hope so! I asked earlier if any current PC sims even attempt to simulate understeer/oversteer - do you know if any do? -- Pat Dotson IMPACT Motorsports http://www.impactmotorsports.com/pd.html

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