Are AC street cars too easy to drive on the limit ?

Yeah.

 

Which tyres are these?

 

GT3 meds

 

It'd be relatively fine for a road car (maybe a higher optimum slip angle would be more accurate)...race tires don't look like that though. @PhilS13

 

Care to share any example/reference? (about the last part)

 

Depends on the car, but what I do have I can't share...that said, this one is fairly accurate (red line)....

 

You can't share a simple curve? Come on, just remove the values on the axis

 

No, I can't....as I said, that graph is fairly accurate.

 

Win. This is how the discussion should be going. Thank you David, F1Papa, and PhilS.

 

Damn, I have such bad luck ... I read everywhere on the Internet that racing slicks drop more lateral force past the peak but I have never seen one single example... and meanwhile the few data that I have shows basically flat curves past the peak (if they even peak...)

 

Genuinely that graph is quite close to the data I have...it's the best I can legally give you.

 

I hope it's not some Pacejka-generated bull**** curve

 

AC's looks quite similar to a generic Pacejka model tbh...red is the slip angle curve

 

Nice try, but you didn't answer

 

I wouldn't be contractually obligated to not show you data if it was a bull**** Pacejka model....use some common sense

 

Pacejka coefficients aren't easy to find, so who knows

 

Anyway the only sim that I know that used to have that kind of slip curves (the first pic you posted) was iRacing when the tyre model was half-broken (cars snapping for no reason etc).

 

Street tyre.
Peaks later as expected but the shape is pretty much the same.
Keep in mind I'm not aligning the loads with Fz0 so FLEX_GAIN should have an effect on where the peak is. Loads were lower than Fz0 on the GT3 test and higher than Fz0 on the street tyre.



The problem with the real life race tyre curves is that they rarely include data past the peak cause it's kind of irrelevant to a race team. These two extensions I made will have a major impact on how catchable a slide is. When you almost lose it you are not only 1-2 degrees past peak...you're way beyond. If real life tyres drop off sharply right after the peak but stay constant further up the angle axis then the AC curves make sense as far as catching big slides go even if they appear kind of flat.

 

This. Everything I've seen for race tires (and logic itself) points toward that top line being correct. The data I have only goes to 2 degrees more than the peak, so there's a good chance the top curve is correct.

 

@mclarenf1papa can you quantify the lateral force dropoff in % between the peak and those 2 deg past the peak? Or is it supersecret too?