In real life you can have two cars both with mass CG right at the geometric center but with very different rotational inertias. Has to do with how far every unit of weight is from the mass CG. Still I think the box method is good. Do you have the bmw e92 box length?
When you tried 90s slicks and grpA where they of normal width or you made them super wide as well?
Turning circle is identical to the URD C6R, if that car is more responsive, it's likely to be a complex relation between geometries, dampers and tyres. I don't have an FFB wheel so it's impossible for me to tune. Someone else could try to tweak the various values of course, e.g. increase FFMULT or change STEER_RATIO and see what happens.
; In car.ini [CONTROLS] FFMULT=1.20 ; Force Feedback power multiplayer STEER_ASSIST=0.55 ; Variable steer assist, speed relative STEER_LOCK=320 ; Real car's steer lock from center to right STEER_RATIO=17.1 ; Steer ratio LINEAR_STEER_ROD_RATIO=0.00271
The model was ripped from Forza by some Russians. Their "mod" is a payware scam: ripped model with URD C6R physics (literally, not changed at all). Mine is the model from that with Cobra sounds and 98% reworked physics, using real V8SC data where possible, tyres are also original.
Obviously can never be "released".
Wide. 345 front, 365 rear! (yolo) Maybe I should try just making the tires skinny to see what it does to the car.
Maybe this is a wheel issue because for me I don't really notice any wandering. Some people are saying it does it but personally I only seem to notice it when I drive with keyboard (testing stuff) or with a wheel braking into a corner where it does get a bit squirrelly. But with a keyboard I notice the car has a tendency to keep its rotation. Like if you make a turn on the straight the car kinda keeps going to that direction. But I don't notice it with wheel (fanatec 911 tbo s).
Hmm, maybe I should tripple check the steering arms. Does the problem go away with more toe-in? Sinbad also mentioned light feeling in the center.
The model and sounds are borrowed.
I'll take a look. What was wrong? Too little unsprung weight, tires..?
I really couldn't say, because I never kept any sort of a log of what I changed. Any combination of the DX/Y values, flex, xmu, friction limit angles, relaxation length, hub masses.. Sorry, I can't be any more specific. Besides, the Jag may not even have a problem as such. It could be down to individual players' wheel settings and such. Various people with the same wheel seem to have very different opinions on some of the cars in AC :-\.
It's really quite complex the way the values interact with each other. When I was tweaking my tyres I found that anything more negative than -0.02 for the DX/Y1 values were undrivable, yet I've seen tyres that work fine at 3x that. Crazy.
Hmm, I think I'll send a pm to aris to see if he responds. As far as I know he was one of the guys doing tires and physics for the gtr2 power&glory mod so he should have good bit of info about the tires these suckers have.
I'll check that reducing dy0 but again I just don't want to it blindly. So I need to figure out if it works why it works.
I did check some rf mods. And nope. I don't see such pattern.
It is odd because on my car I can pretty much change the dx1/dy1/xmu values in a major way without causing big difference to the car handling. What I have found is that my tires seem to be (or were at one point) somewhat camber sensitive.
Let's say that a V8SC has
- 24 degrees of steering angle
- 400 degrees of rotation (so a bit over 180 per side)
Steer ratio would be 400/24 = 16.7
By using the below method to get the rod length, I get 0.00261.
So the final values for control would be as below, feels alright.
STEER_ASSIST=0 ; Variable steer assist, speed relative STEER_LOCK=200 ; Real car's steer lock from center to right STEER_RATIO=16.7 ; Steer ratio LINEAR_STEER_ROD_RATIO=0.00261
A bigger problem is that as far as I can tell, real V8SCs run a minimum of ~-14 degrees of caster. The current geometry only gives -6.4. Perhaps that's why it lacks feel that upping the FFMULT can't fix.
I want a clean post for this so no edit. I was told that the iRacing V8SCs have a steering ratio of 13.56. Assuming 400 degrees of steering wheel rotation, 400 / 13.56 = 29.5 degrees of steering angle.
- All of the AC console INIReader errors fixed.
- -15 degrees of caster.
- 400 degrees of steering lock (lock to lock, 200 per side).
- 29.5 degrees of steering angle.
- 13.56 steering ratio.
- LINEAR_STEER_ROD_RATIO is 0.00296.
- FFMULT is set to 1.5 from because I suspect that the increased caster will help with feel.
I worked on the steering issue a bit more, changed some values. Now it feels better for me, of course take such comments from me with a tablespoonful of salt considering my steering input device.
WBCAR_STEER= 0.390, -0.180, 0.122 ; Steering rod car side attach point WBTYRE_STEER= 0.108, -0.193, 0.149 ; Steering rod tyre side attach point
WBCAR_STEER=0.390, -0.180, -0.122 ; Steering rod car side attach point WBTYRE_STEER=0.108, -0.193, -0.149 ; Steering rod tyre side attach point
STEER_RATIO=12.5 ; Steer ratio LINEAR_STEER_ROD_RATIO=0.00248 ; Because of AC complex suspension geometry, you need to calculate manually the steer rod ratio
STEER_RATIO=-12.5 ; Steer ratio LINEAR_STEER_ROD_RATIO=0.00216 ; Because of AC complex suspension geometry, you need to calculate manually the steer rod ratio
In summary, changed the steering rod attachment points to invert the steering ratio to be positive and adjusted the steering rod ratio using the method in the file comment.
Out of curiosity, where did you get the dimensions of the car? A modern V8SC's height is quoted to be
and just by looking at images, the Jag doesn't look taller.
I noticed that sometimes the car gets into very severe oscillations that takes ages and ages to settle, after hitting kerbs. I reduced the car's height by 0.2 to be close to the height of the road-going XJ12C which I saw quoted to be 1372mm, and these huge oscallations reduced noticeably while retaining the boat-like characteristics intact.
Also found that some of the vagueness in the handling was down to the setup as well, I used the one attached (remove .txt).