Torque calcs for 1st and 5th or 6th gear
Torque calcs for 1st and 5th or 6th gear
(OP)
I need to know the basic method for calculating torque at the flywheel and the wheels of a car. Any car will do, I have the gear ratios inside the transmission but need to know the ratios in the diff.
I then need to determine (assuming no losses or any kind of torque conversion device) the torque at the wheels for a given engine rpm. Lets say 1200 rpm and 3500 rpm (or somewhere close to max torque) I have the torque rating of the engine and the horse power. For simplicity we'll call it 300 hp @ 6000 rpm and 300 lbft @ 3500 rpm
Also is there any good web sites where I can find gear ratios for cars, trucks, etc. (transmission and differentials)
Thanks
Marc
I then need to determine (assuming no losses or any kind of torque conversion device) the torque at the wheels for a given engine rpm. Lets say 1200 rpm and 3500 rpm (or somewhere close to max torque) I have the torque rating of the engine and the horse power. For simplicity we'll call it 300 hp @ 6000 rpm and 300 lbft @ 3500 rpm
Also is there any good web sites where I can find gear ratios for cars, trucks, etc. (transmission and differentials)
Thanks
Marc





RE: Torque calcs for 1st and 5th or 6th gear
There is also an easy equation--Torque X RPM divided by 5250 gives you the HP at that RPM. Or, Torque=HP X 5250 divided by RPM gives you the torque at that RPM.
RE: Torque calcs for 1st and 5th or 6th gear
Engine Torque = 300 ft-lb
1st gear ratio = 3.27
rear end gear = 3.50
Wheel torque = 300 x 3.27 x 3.5 = 3434 ft-lb
Make sense? Use this formula to go backward to calculate the engine torque knowing the wheel torque.
RE: Torque calcs for 1st and 5th or 6th gear
Thanks for the help....if anyone knows of any web sites that have various gear ratios that would be great....I'll keep trying on my own though.
Thanks again
Marc
RE: Torque calcs for 1st and 5th or 6th gear
3434/2=1717 ft-lbs
RE: Torque calcs for 1st and 5th or 6th gear
RE: Torque calcs for 1st and 5th or 6th gear
An idealised conventional diff is a torque splitter, by the way, ie half goes to each halfshaft. It is the speed of each wheel that varies.
Cheers
Greg Locock
RE: Torque calcs for 1st and 5th or 6th gear
RE: Torque calcs for 1st and 5th or 6th gear
result.
sitbc
RE: Torque calcs for 1st and 5th or 6th gear
http://www.prestage.com/community/Tech+Info/Transm...
I haven't seen any lists for rear ends except car specific one's
RE: Torque calcs for 1st and 5th or 6th gear
Jeff
RE: Torque calcs for 1st and 5th or 6th gear
you are right on both counts
but i think my point was understood.