nobody picked up on rear gears adding torque?!?!..... torque is a mesurement of force create by the engine crank in relation to the downword force on the ground..... gearing will not increase tq in any way the only thing that gearing does is allow you to reach a higher speed in a shorter time but reduces the top speed overall assumeing your making your gearing taller....

 

technically there is a torque multiplier based on your ratio, but most dynos will correct for it

 

I think you did not read the post right after

 

torque is a measurement of angular force around an axis. Regardless of power source, if inertia is overcome faster, there is a greater angular force. therefore, TECHNICALLY steeper gears will increase the torque at the rear wheel.

basic physics: force is a measure of mass*acceleration. if you increase acceleration, mass stays constant, you have effectively increased the force, which in angular units is torque.

to the best of my knowledge, however, most dyno programs will correct for gears so you wont see this gain. its been awhile since ive really discussed this stuff though. the "correction" thing was something i picked up on tech awhile back.... so if thats wrong dont yell at me lol

 

I'll step it down a knoch.
Torque is one of the measurements of an engine's output. Your gears determine how you use that torque. You can trade high speed for more acceleration. You can not increase torque with gears, only change how it is applied. This is why a Ls1 6 speed has the same torgue as a LS1 with a 4 speed automatic. Most of the time if you compair the torque curve of a V-8 with that of a V-6 theV-8 curve will build torque sooner.

Dyno know the surface footage that a tire is turning and RPMs. You can Dyno in any gear but most of the time dynoing is done it what ever gear has a 1:1 ratio. (with the 6 speed that would be 4th gear and with the automatic it is 3rd gear). When the trans is running 1:1 there is less energy lost in the tranny and more power to the wheels. Alteast that was how we did it back in my racing days. We had quick change rears we changed gears for tracks all the time. I never had to verify which gears where in the rear when we would check the motor for Out put.

 

i dont necessarily agree with the part in bold. I mean this w/ no offense, i assumed my explanation w/ the physics was easy enough. if i wasnt clear ill try again.

to start again:
torque is a force. It is angular, so its actually same force you apply using a socket wrench. to the best of my understanding, the gears act as the lever arm in the system. so the handle of the wrench acts similarly to the ring and pinion (or if not similarly, maybe analogically is a better word).

What do you do with a stuck bolt? slide a bar over the handle, increase the lever arm, give yourself a mechanical advantage, and increase the torque seen on the bolt. your arm must move further in order to turn the bolt the same ammount, but the torque is increased so the bolt moves easier.

in this analogy, the bolt is the rear wheel. with a taller gear, you give the motor a mechanical advantage over the rear wheel. the motor must move further to move the rear wheel the same ammount, but the wheel turns easier. Therefore you ARE increasing torque. The effect of a taller gear is a torque multiplier. I believe power take-offs use similar gearing to get ridiculous torque numbers for PTO driven machines on modestly powered tractors.

anyways, this is just how this makes sense to ME. maybe im wrong. because motors do not make static power across the powerband, and that adds another dimension and things get sticky. I do know that dynos take into consideration rear gear ratio when doing their calculations. and dynojets plug in to directly read RPM, so they arent factoring gear ratio to get rpm (like the land&sea dyno i go to)... id assume its a torque correction.

if you go post at tech w/ a dyno graph, those guys will often ask right away if the numbers are corrected for gears....... if you didnt do it back in ur racing days... i dunno. i wasnt racing back in ur racing days i assume lol. there may be different ways of doing things now, software may be different..... i know dyno ratings have changed from 30 years ago (without knowing how old u are lol)

 

Haha both are right.. from a physics and ground perspective it does increase torque being placed on the ground. As far as "Motor Torque" (I'll call that the torque the motor can make) It does not increase.

 

if he was talking motor torque then yes. but if they dynod in the past never specifying rear end ratio.... they were measuring wheels. now to be fair, a 3.23 to 3.73 swap gives a difference of only 13%. i dont know if the % change is linear w/ the effected difference at the wheels.... but it should be proportional

 

too much laws of nature talk here for me, i'm good at working on cars and replacing parts and such but when it come to numbers and gains and **** i could care less if my car goes faster it works for me. i think the driver makes the car not the other way around, you can ahve someone in a ls1 that can't drive and another person in the same car that can drive, both bone stock, who do you think is gonna win?