realistic tire grip

[Oszczany_Mnich]

Please fix tire grip, it is totally weird that 100hp car can lose traction on dry asphalt without any clutch kick. For example: when going into corner at 60km/h there is huge understeering and car goes straight

[Kirby]

a 100hp car probably doesn't have very good tires. And you probably mean understeer if the car is going straight, you need to slow down and not turn too much.

[Everhard Dawnwood]

Not unrealistic at all, Ive been driving for 29 years now and I had a car back in the day with 55 bhp, making a hard turn would easily cause the inner most frontwheel to loose grip.

Your definition "a corner" what radius is that?!? The radius of a curve and the velocity is what determines how "hard" of a turn youre doing.

Your traction will never (on any car) exceed 1g acceleration, unless you use special tires and/or the surface is something more sticky than asphalt, as rubber tires on asphalt has a friction coefficient of almost 1.

Then comes the loss of grip due to weight distribution which changes when conering as the car rolls and also, accelerating at the same time will cause even more friction loss on the front wheels.

Different cars have different grip due to weight distribution, suspension system aso.
Once I took a Toyota Corolla 1.3 (75hp) and with the parkingbrake engaged, began to try and accelerate, while the brakes were holding it back, I had to apply more and more throttle to send more power to the wheels, until the tipover point where the tires lost grip and it started to do a good oldfashioned burnout.

Then I tried with my Peugeot 309 1.9 GTi, which had stiffer and lower suspension, as well as better tires and it took some revving and sudden engaging of the clutch to make the wheels spin, despite the engine (slightly tuned with different cam shaft and long tube exhaust) put out almost a 150bhp.

In addition some cars have LSD which may have a preload so they lock perhaps 30% or so, while others may have completely open differentials, which means you only need enough power to break free from the traction of a single tire, to initiate wheelspin.....thats what happened with the Corolla, one wheel would lose grip before the other and start burning rubber.

Horsepower isnt everything either, you can make a car with 30bhp do wheelspin with the correct gear ratio, as your gearbox effectively multiplies the torque on the wheels, the lower the gear, the greater the torque.

Basically it "trades in" rpm (at the wheels) for torque as in a low gear the wheels will spin slower but with greater force.

...and rpm in relation to torque is btw, how you calculate your horsepower as the torque is the force applied to the crankshaft for each combustion stroke and horsepower is energy per second, thats why you have more horsepower at higher revs and it keeps going up until the torque wears off.