Forum Discussion
JRscooby
Dec 02, 2019Explorer II
Turtle n Peeps wrote:
Let me try to explain to the fan bois why an old truck like I own puts out many, many times more torque that the Cyber junk.
The truck I own puts out 650 ft/lbs at the crankshaft. That torque is fed to an Allison tranny with a 1st gear of 3.10 to 1 gear ratio.
Now that 650 ft/lbs of torque that is feed into the tranny comes out as 2,015 ft/lbs of torque.
But we are not done yet. Now fan bois, we need to feed that 2,015 ft/lbs of torque into the 3.75 rear end.
So, 2,015 ft/lbs go into the rear end and the tires see slightly over 7,500 ft/lbs of torque.
It has been reported that the Cyber junk will have 1,000 ft/lbs of torque. If true, my 12 YO truck will put out 7x's the amount of torque the Cyber junk will put out.
I'm not well educated, but I think you over looked something in your math; You say your engine puts out 650 ft/lbs. But you do not account for what RPM it puts out that amount. Divide that RPM, by the 3.75 for rearend, then that by the 3.1 of the transmission, how fast is the wheel spinning to get that 7500 foot lbs of torque?
Now a electric motor puts out max torque as soon as it starts to turn. So in a silly "tug of war" the only engine torque the E must overcome is the torque at idle thru trans/rear.
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