Physicist here. It's nice to hear someone get it right. There is so much nonsense written about torque. The funniest is car magazines that list "torque at the rear wheel" as the engine crankshaft torque times 80% (or whatever they assume for the driveline efficiency). That works for power but betrays their lack of any understanding of what torque actually is.
Thank you for the comment! What got me through my Highschool and college Physics classes was mentally applying everything I was learning to drag racing my car. Thats the red Camaro from the video. Growing up as a gear head and having a basic understanding of what was going on in automotive applications sure made those classes much more entertaining and easier to pick up.
You might wonder why I used Torque as the unit of measurement going through these examples rather than Horsepower. The reason is Horsepower remains the same going through the gears. Horsepower is Torque x RPM divided by 5252 so as the Torque is multiplied the RPM goes down by the same multiplier. Therefore the Horsepower remains the same. Horsepower is a unit of energy. The energy always remains the same. Torque is a unit of force. The force can be multiplied but the overall energy going through the system will be the same from its source (minus small frictional losses of course).
Isn't that 790 ft/lbs of torque if and only if the tire was the same size as the sprocket? I'm pretty sure you have to calculate the moment arm (distance from the sprocket where the torque is applied by the engine to the tire where the torque is measured).
@f.f.s.d.o.a.7294 only if you are applying the force from the end. Like if the force is being applied at the tire. The force is being applied from the sprocket and being measure a distance away from thr sprocket and therefore would be less.
torque is not measured it is calculated 😉👌🏻 from force and arm lenght ,torque egzist only in axis of rotation when he calculated torque from gear reduction it directly calculated torque ypu dont need tocslculated anything else 👌🏻 what he dont take i to considerstion is drive train losess ,but thats diffrent story .
Thanks for the comment and that is actually an excellent question I've been waiting for. For one reason the chassis dyno always measures horsepower. It takes a transfer of energy to accelerate a heavy mass up to speed. That energy is horsepower and the heavy mass is the dyno drum. The dyno does not measure torque directly. The Chassis Dyno calculates Torque at the engine. The dyno computer keeps track of how quickly the drum is accelerating and calculates how much horsepower is being delivered to make that acceleration. The dyno computer also reads engine RPM while accelerating the drum. The mathematical formula for finding Horsepower is (Torque X RPM) / 5252. Just the same the mathematical formula to find Torque is (Horsepower x 5252) / RPM. The dyno computer knowing the horsepower being put into accelerating the drum and reading the engine RPM at the same time does the calculation and shows you your torque output at the engine. Not at the wheel. If you run a car or bike or anything on a dyno whether you run in 1st gear, 2nd gear, 3rd gear or any possible gear you will always get the same result for horsepower and torque (minus things like frictional drag and differences in accelerating your own drive line). Try it. But you know 1st gear accelerates faster than 5th right? So what is going on? The chassis Dyno directly measures Horsepower. Your engine always makes the same horsepower no matter what gear you are in. The chassis dyno reflects this. Torque = (Horsepower x 5252) / RPM . As you run on a chassis dyno in 1st gear you have tremendous amounts of torque going to the wheel and the dyno drum because of the torque multiplication of your 1st gear. Thats why its easy to spin the tire on the drum and you can really get that drum moving fast as your engine hits redline super quick. Now go up to 5th gear and make a run. Now your tires are going a lot faster. The drum is spinning a lot faster but it takes a much longer time to rev out the engine. You are putting much less torque at the rear wheel because of the lack of torque multiplication from being in 5th gear but since the drum's (and your tire's) rpm is much faster using the above formula the Torque calculated at the engine is still the same. I recommend watching my other video about Torque vs. Horsepower. As an interesting side note. A engine dynamometer directly reads torque and uses the same calculation above to figure horsepower. So its exactly the opposite than a chassis dyno. I hope this answered your question.
mostly correct though not everything 👌🏻🍿 feg your car egzample with reduction x1,5 if it would have flat wide enough peak power and in stock form enough „everyhing” for go on limit of grip at launch ypur x1,5 times shorter final gear ratio will make it only slower as ypu will nedd to ups 1 times more before cors 1/4 mile finish line so such use less avg power so such „ggreat ewualizier „as you call gear ratios dont give you better acceleration at lower power no matter how you setup gearing cos what ypu miss here is SPEEED factor cos in racing we consider SET SPEED range accelerstion and not set gear cos nobody cares of somebdoy os at 100 km/h at 1 or 6 gear right ? what wr care is who win race thats makes diffrences 😉👌🏻🍿 …..atleast in next video ypu go directly into goal = topend power beat lowend torq at drag strip at perfect gearing each and the reason is so simple as this equation 👉🏻 power:speed= force👌🏻👉🏻 dosent matter what ypu do with gearing and how much more crank engine tprq ypurengine will have as long as ypu will use less avg power for accelerwtion at set distance of race YPU LOST 👍🏻🍿
