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BMW 3-Series (E90 E92) Forum
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Torque gain or loss
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10-17-2018, 03:18 PM | #1 |
First Lieutenant
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Rep 290
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Torque gain or loss
How much torque do I lose going from a 3.46 to a 3.15? Currently at 458 wtq
Putting a e92 m3 lsd on my 335i and want to know what numbers look like |
10-17-2018, 03:40 PM | #2 |
E82 Mudflap Ambassador
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Rep 2,220
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Drives: '08 128i
Join Date: May 2016
Location: Orlando, FL
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1) you're in the NA forum
2) it's more complex than you think. Your motor will always be able to produce 458 ft-lbs of torque (for simplicity sake I'm not converting wheel horsepower to crank horsepower). What you're changing is your mechanical advantage - your torque multiplication. Think of it like a lever, or a breaker bar. The longer your breaker bar, the more the force is multiplied. For example, YOU as a person will always apply that 100 lbs of force. But the force that comes out on the other end is now changed. If you have a 1ft breaker bar, the torque to spin the bolt will be 100ft-lbs. But if you have a 3ft breaker bar, the torque to spin the bolt is now 300ft-lbs. Going from a 3.46 to a 3.15 ratio diff is going to feel like you lost approx. ~10% of your torque. BUT your RPM at any given speed will now be ~10% lower. Let's say you were at 3000rpm in 4th gear going 50mph. Now you'll be at 2700rpm in 4th gear going 50mph. So your top speed in any gear will be higher.
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