How strong should be forcefeedback in gr3 cars? How many newton-metres (Nm)?
In real life drivers can spin the wheel using two fingers. But everywhere I see recommended value so strong, that I have to use two hands,
Check this video in cockpit view. He can turn easy, I think with maybe 2Nm max.
I don’t think you realize how low 2-3nm is. Most street performance cars are in the 5-7nm range with power steering. Something like a GR3 would be in the 7-10nm range.
You’re not always having TQ that high either. Meaning, on the straights steering is lighter vs mid corner with cornering forces increasing the TQ through the wheel. You can see this in the video and the resistance mid corner. You don’t want a super light wheel, you want information on what the cars doing.
I never drove racing car but i drive basic go karts with about 25hp(80kg gokart weight) regulary and i believe they have force feedback strenght around 3nm(i would say stronger than g29, without that weird gear sound).It can definitely make my hand tired after 20-30min.
So i assume actual race cars have at least about 6+ nm
I wouldn’t call 25hp a basic go kart lol. That’s shifter kart power. And the force in those is easily over 6nm, prolly 15-20nm. Rental/cheap karts are even worse due to the weight, they can be pretty heavy steering.
You’re correct on 6nm+ for race cars though. There’s not a lot of info out there but we’ve seen some over 20nm but that’s before power steering. With it, prolly around 10nm depending on the car.
It also depends on which point we’re measuring. At a stand still, driving on a straight, mid corner, kerbs etc.
Lot of variables effecting it, speed, corner type etc. We also have average readings vs peak. Hitting kerbs in a race car will see dramatically higher peak readings than a street car. Reason being, a street car has soft bushings/suspension to reduce the impact on the driver. A race car doesn’t have this, you feel everything at much higher forces as there’s no cushion in the system.
I did see that Jan Seyffarth (GT3 driver) commented that it’s around 8nm on his Simucube, but that’s for constant/average not peak. Peak is much higher depending on the situation.
Good video too.
EDIT: Found this lengthy study detailing tests between rfactor and a real Formula 3 car At Cataluyna.
https://repository.tudelft.nl/islan...296-be74-51d0fd752fc5/datastream/OBJ/download
Cliff notes: “The first aspects which limits the fidelity in the simulator setup is the power supply of the steering motor. Since this motor combined with the current power supply is able to deliver 16 Nm of torque output, higher steering torques can not be generated in this setup. The impact of this limitation is that torque peaks well above 16 Nm are cut off as a constant output of 16 Nm. This reduces the ability for the driver to feel aligning torques and consequently the indication of level of grip at high steering torques.”
The F3 was hitting 10-20nm of torque depending on the situation with spikes a lil higher. The DD wheel they had could only do 16nm so actual forces past that resulted in clipping unless they lowered the force.
