[WIP] Porsche 935/K3

I haven’t had much time investigating this problem, but tried different things to identify some oval problems where it gets a weird "push down" on right front which resolves in rear tires scrubs and slides a bit to the right until it looses control.

- tried old tries
- tried more tire pressure
- tried stiffen up springs
- tried to add more packers from 7mm to old where it was 21mm
- tried min/max on rear aero
- tried reversing aero changes for frontwing/rearwing/left-right fender and body

But problem persists. Next I will look at chassis and spring geometry.
 
Hello Thomas,

did you check the Tire Temperature Progression?

I remember a Mod, where Tires on Ovals got much too hot after a While, so that the Rear did slide away with high and uncontrollable Oversteering.
 
Hi @redapg it does it from start, and also after some laps, so quite persistent. I can make a video, but wont be able to until sunday afternoon. you can try it on some highspeed ovals.
Again this is only some of the problems I have with the tires.
If you want to test how I wanted the tires to feel you can try it on Spa or Portland. :-)
 
got to test some more today, it was the rear chassis geometry that caused it, so have changed it a bit to avoid this, but then I have to adjust the tires a bit more. the oval test also showed the tires only heat up on scrub so have to work a bit on that too.
 
ThomasJohansen said:
During my testing I have mainly tested on
- Portland
- Spa
- Laguna
- Road Atlanta
- Donington
- Nurburgring gp.
- Sebring (very bumpy tire feel)
- Loch drummond
- Zolder (slippery)
Felt good, some compromises to "fit all", but overall a tire that was not numb, overheat when slip over the limit, a good feel when weight shifting.


But well, in the last two days, just tested the tires on some more tracks, and now my tires fails miserably.

- Brand hatch, tires feels slippery on some parts too sticky in others sections, when heavy weight it gets uncontrollable.
- Ac Algrave, way too slippery tires
- Croft, really bumpy tires
- Dijon, slippery tires in turns
- Daytona, good on most but terrible on oval corners with heavy weight.
- Dubai, too sticky tire feel.
...

I'll be back when I have solved this, sorry...:confused:

If I cant find a quick fix I'll upload a new version with the old tires.
Click to expand...
Back in the days of GTR2 & our SCC mod, We had a problem at Le Mans. The straights were too long and the tires cooled too much, which meant they also didn't have enough heat for the corners. So I tried to build a set of Le Mans only tires that had greater heat from rolling and less heat generation from sliding. The tires were rubbish, but they did provide the main result. That also meant if someone used the Le Mans tire at a normal track, the tires would overheat in just a few laps.
The complexity of rF2 to GTR2 is offffffffff the charts by a huge magnitude. I do not envy your difficulties achieving your goals.
 
It takes a lot to deal with physics that has an issue in it, and the hardest part is that by solving it is not hard to create more issues without solving real one. Of course if you know what you are doing you are more likely to simply improve the car even if you don't really find the main issue. Happens to me often, usually I find the problem, at least I think so.... Just recently I had problem with Cooper T51, tried a lot of things, some little issues things got improved on the way, but true fix was just running chassis through solver in devmode. Or with Tyrrell 008 spend lots of time trying to make it behave, and at the end the most helpful thing was simply reducing nominal tire grip values... and then it felt perfect-perfect... I drove 008 again few weeks later after pausing on it, and it didn't feel perfect :D
 
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