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Any physics manual?

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Kiardon

Joined: 27 Mar 2008
Posts: 6

Posted: Thu Mar 27, 23:01

Does anybody now if there is manual explaining different things in car's physics? Im making RWD physics (driveable now, ok feeling, but project at the beginning soon..) but problem is that I must test nearly every thing in physic files. For example, when I would like to move tyre, only way to do it is just test everything that I suppose could help. So im often having geometrys badly wrong etc. You know what I mean. And this costs lots of time. I would be very thankfull if there is any manual explaining how everything work.

Sist_r116

Joined: 06 Nov 2006
Posts: 267

Posted: Fri Mar 28, 10:33

I'm also interested for a similar project (I prefere not to say more because it could take a lot of time). Anyway, Kiardon, ,if you can post what you found out I would appreciate (and other modders too I think) _________________ GAAAZZZZ !!! https://www.rallyesim.fr/forum_rlsm/index.php I'm Flat-twin on Rallyesim

Kiardon

Joined: 27 Mar 2008
Posts: 6

Posted: Fri Mar 28, 13:55

Sorry, I dont fully understand what your saying Sist_r116. I said that Im very interested if there is any manual that could help me. I dont have any manual myself. (Im sorry about my english, I think it is the problem here..) I asked is there any manual explaining these "codes" in physics (or what we could call them)? These (for example) "vecJointPos= -0.45 +63 -0.12" things. I know now many of these things how they work but 90% of my moding time I have to use to just test what affects to what. So if there is any manual explaining what affects what it could help a lot.

Sist_r116

Joined: 06 Nov 2006
Posts: 267

Posted: Fri Mar 28, 15:12

That's my fault, I did not express myself as I wanted. In fact I have a similar project than yours i.e. a RWD car. I haven't yet much time to try things in the physics files as you do and I would also like to have a manual. The last thing I said was just asking you if you could share here (or in another dedicated topic) what you discovered so far. If I have clues about things that I may discover when creating my physics, I would also post here those "researches". Is it clearer for you ? I wish you good luck in your project edit : RTS013 if you come here please help us, you almighty god of the RWD Volvo _________________ GAAAZZZZ !!! https://www.rallyesim.fr/forum_rlsm/index.php I'm Flat-twin on Rallyesim

Kiardon

Joined: 27 Mar 2008
Posts: 6

Posted: Fri Mar 28, 15:56

Ye now I undestand! Of course I will share all my knowledge. But now the situation is that Im the guy who needs help.. I would also be very thankfull if RTS013 could help us. Sist you are working with that bmw e30 m3, am I right? I've tested it and I think it really has potential. But now feeling of the car is a little bit like driving on track, I mean its a bit like a touring car. It maybe needs more mass? Im working with Escort Cosworth, making it RWD. Physics are now driveable, but there is still lot to do. Now Im trying to get knowledge about wheels, I mean geometries. I have wheels now in right positions, but because I copied their positions for Escort:s original physics and then lifted them front to rear and rear to front, Im having rear tyres a bit too out from the car. When I try to move them in a bit, Im having lot of positive camber. Thats because I dont have enought knowledge about geometries now. For me, the manual explaining just these wheel geometries would be enought at this time. I will maybe start topic about my project, but not now, then when I have some beta-physics ready.

Sist_r116

Joined: 06 Nov 2006
Posts: 267

Posted: Fri Mar 28, 16:13

I have a certain knowledge on how it works in real life, but I think you looked for the datas you needed to understand that. From what i understood in the physics files, you can ove each attach (joint ?) point of the suspension. Then if you only move the stub axle point of the wheel, you will change the camber. So you have to move also the base point of the shock absorber (where it is attached to the body). I'm not exactlly sure it is the way it works but it deserves to be tried. I don't know if you see what I mean but I will try to find some drawings tonight to be more explicit. And I'm indeed on the M3 project. By the way, it would be also good if Grumpa could get here _________________ GAAAZZZZ !!! https://www.rallyesim.fr/forum_rlsm/index.php I'm Flat-twin on Rallyesim

Kiardon

Joined: 27 Mar 2008
Posts: 6

Posted: Fri Mar 28, 17:54

I have also a certain knowledge about geometries etc how they work in real life. What comes to rbr, there these things are codes and numbers, we cant see the parts when changing the values, and it makes problems. I think its easier if I send here a piece of physics. What I would like to know is what these exactly mean and how these work. For example vecJointMount_VF=................ (This is from volvo): WishboneLength +1.31595 vecJointMount_VF -0.725 -0.000 +0.097 vecJointAxis_VF +0.000 -1.000 +0.000 vecSteeringMount_VF -0.725 -0.000 +0.097 vecSteeringAxis_VF +1.000 +0.000 -0.000 vecDriveAxleJointPos_VF +0.010 +0.000 +0.097 vecStrutRodMount_SF +0.000 -0.130 +0.000 vecStrutHubPoint_SF +0.130 +0.000 +0.050 vecStrutHubAxis_SF +1.000 +0.000 +0.000 StrutDimX -0.001 StrutDimZ +0.250 DriveAxleMountOffset +0.000 WishboneSign -1.000 SteeringSign +1.000 AntiRollBarId 0 AntiRollBarSlot 0 vecTopMountDeformUpAxis_RF 0.0 0.0 1.0 vecTopMountDeformSideAxis_RF -1.0 0.0 0.0 TopMountMaxDeformSide 0.05 TopMountMaxDeformUp 0.05 RBR physics creator cannot be used to make RWD cars, right? But can it help something. I mean, if I do some things by physics creator, for example change wheelbase, and then copy the values from creator to my own physics. Then all values should be right, I think creator changes all the values needed, when I for example move tyre. Am I right or not, I have used creator very little time.

Sist_r116

Joined: 06 Nov 2006
Posts: 267

Posted: Sat Mar 29, 01:06

I think we are at the same point (except that your have tried some things and I did not begin anything yet ) Seriously i think you know more than me. I think i will start by modding the engine and then with some serious data I will try to mod the suspensions but I also need to understand what values I need (I can have the real values for my car). So actually i can't help you more, sorry. _________________ GAAAZZZZ !!! https://www.rallyesim.fr/forum_rlsm/index.php I'm Flat-twin on Rallyesim

Sist_r116

Joined: 06 Nov 2006
Posts: 267

Posted: Tue Feb 24, 22:23

Hi, i'm looking for a way to increase front wheel max rotating angle for the M3. Actually the max angle must be about 40°, i'd like to have maybe 50 or 60 (as the volvo I think, but the volvo can go even further like about 90°) to better control the car when it slides (because it slides very quickly). _________________ GAAAZZZZ !!! https://www.rallyesim.fr/forum_rlsm/index.php I'm Flat-twin on Rallyesim

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