Can someone point me to a resource where a driver has posted actual lateral and longitudinal acceleration data; preferably on a shifter, preferably from someone who is on the limit? (i.e. not me)
I don’t have this stuff on my kart, but I would like to do some calculations using good data. The rumor is that karts will pull like a million gs in all four space-time dimensions at .9c, but I’m skeptical. 🙂
My google-fu is only turning up ads for data acquisition systems.
we don’t have a lot of high speed turns at the AMP track, Stock Honda shows max 2.8G braking, and 2.3G Accel on one of our better laps. Lateral G’s are pretty similar at 2.78 and 2.69, but we get an occasional 4g lateral when we don’t take a 2nd gear downhill/uphill corner correctly, or 3.8g lateral in a 3rd gear corner. these were in cooler weather during Nov-January, between 45-60 degrees, sunny.
The lateral G’s seem appropriate, and the braking level does not surprise me either. But unless there is a 1st gear corner, 2.3 for acceleration seems high to me. Maybe 2nd gear with a strong motor. But 3rd gear or higher?
It has been a while since I used a data acquisition setup on a shifter, but I don’t recall getting anywhere near that kind of acceleration after I was already on track. Standing starts could produce high numbers with sprint gearing, but again, that is for the launch and 1st gear.
The braking and cornering numbers are not affected by speed, but acceleration certainly is. Aerodynamic drag reduces acceleration as velocity increases, especially on long tracks. But the big killer at sprint or road racing speeds is the reduction of torque at the rear axle with each change to a higher gear. As I say, the numbers are fuzzy since it has been over a decade, but in even 5th gear you won’t get 0.5 G, I don’t think.