Torque = Acceleration = Your Best Friend :)


MFactory

Gearing Authority
Vendor
Joined
Jan 23, 2008
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764
Hey guys,

Here's something that some of you might find interesting. Was explaining torque multiplication to a few of our customers, as they didn't believe me when I said I could give them an extra 60% torque to the ground without even touching the engine.

Most think the acceleration gain from changing gears is due to the change in rpm and/or shift points. Although this does contribute in a sense (i.e keeping you in your powerband), the main reason why your car is so much faster is because of torque multiplication. For example:

1st Gear - 3.230
Final Drive - 4.4

3.230 x 4.4 = 14.212 absolute ratio. What this means is that, for every turn of your wheel, your crank will have turned 14.212 times. From this, we can calculate the total torque produced to the ground:

Absolute Ratio x Engine Torque = Torque to the Ground

Based on stock EK9 with 115lbft engine torque, the following is how much torque you would gain throughout the whole rev range and to the ground. Engine power does not change.

4.928 Final Drive Only:
1st through 5th - 11% increase. That is the equivalent of 127lbft engine torque.

Our most popular close ratio gear set + 4.928 Final Drive:
1st (3.070) - 6% increase
2nd (oem) - 11% increase
3rd (1.695) - 30% increase
4th (1.384) - 40% increase
5th (1.130) - 49% increase!!!

To put this into perspective, what the above is telling you is that in 5th gear, you would have the equivalent of 171lbft engine torque, and that is without doing anything other than changing your gears. A B18C-R (one of the popular modifications on this forum) is only 137lbft!

Now if we substituted our 1.210 5th gear instead, this would give a 60% increase. This is the equivalent of having 184lbft, which is more than the Mugen Civic RR Advanced Concept ;)

Torque = Acceleration. Torque is your best friend :)

Please Note: Top speeds will be reduced, and different applications require different ratios. It is up to the user to decide on what is suitable for his/her application. However, the point of this thread is to explain torque multiplication, how it works, and why it makes your car faster ;)
 
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