What is the difference between 3.91 & 4.10

**Mforspeed** · Sat, Nov-14-2009, 05:48:48 PM

sorry for the ignorance. I did some search but couldn't find a simple answer to this question. I wanted to know what is the difference in the 2 and how it translates to the car, acceleration, power, mpg? Thank you.

dubzz24 · Sat, Nov-14-2009, 06:49:56 PM

Stock is a 3.62.

Thus, the 3.91 would net an 8% increase in torque to the wheels (3.91/3.62) and the 4.10 would net an increase of 13% (4.10/3.62). Those percentages are also how much higher you'll be revving in each gear going the same speed (eg 60mph stock is what, 2200 RPM? So 3.91 would rev 8% faster and 4.10 would rev 13% faster).

You will accelerate faster but shift sooner with the different gears. Gas mileage is negligable (probably 1mpg freeway).

**Mforspeed** · Sat, Nov-14-2009, 07:21:22 PM

Nice, thank you. would I face any traction issues with either one? Which is more popular?

Gnarleydudeman · Sat, Nov-14-2009, 07:51:46 PM

4.10 is more popular.

You won't have traction issues off the line if u got good tyres, maybe a noticable difference only in the wet but you adjust throttle input to compensate.

natty99 · Sat, Nov-14-2009, 09:59:20 PM

If you're considering going forced-induction anytime soon, stick with the 3.91.

Sat, Nov-14-2009, 05:48:48 PM	#1
Mforspeed Banned Join Date: Sep 2009 Posts: 115 Reputation: 0	What is the difference between 3.91 & 4.10 sorry for the ignorance. I did some search but couldn't find a simple answer to this question. I wanted to know what is the difference in the 2 and how it translates to the car, acceleration, power, mpg? Thank you.

Sat, Nov-14-2009, 06:49:56 PM	#2
dubzz24 Registered User Join Date: Aug 2007 Age: 28 Posts: 453 Reputation: 0 Location: Vancouver, BC	Stock is a 3.62. Thus, the 3.91 would net an 8% increase in torque to the wheels (3.91/3.62) and the 4.10 would net an increase of 13% (4.10/3.62). Those percentages are also how much higher you'll be revving in each gear going the same speed (eg 60mph stock is what, 2200 RPM? So 3.91 would rev 8% faster and 4.10 would rev 13% faster). You will accelerate faster but shift sooner with the different gears. Gas mileage is negligable (probably 1mpg freeway). __________________ 2000 BMW M Coupe - Titanium Silver 2001 BMW M3 6MT - LSB

Sat, Nov-14-2009, 07:51:46 PM	#4
Gnarleydudeman Daily Drive it Join Date: Jul 2009 Age: 31 Posts: 77 Reputation: 0 Location: Essex	4.10 is more popular. You won't have traction issues off the line if u got good tyres, maybe a noticable difference only in the wet but you adjust throttle input to compensate. __________________ Euro Spec - CDV Delete - TIAG on Black - NO SUNROOF - Electric Rear Sunshade - NAV - Electric Folding Mirrors - Rear Lip Delete

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Sat, Nov-14-2009, 07:21:22 PM	#3
Mforspeed Banned Join Date: Sep 2009 Posts: 115 Reputation: 0	Nice, thank you. would I face any traction issues with either one? Which is more popular?

Sat, Nov-14-2009, 09:59:20 PM	#5
natty99 tryin' to stay classy Join Date: Sep 2008 Posts: 5,503 Reputation: 0 Location: NYC	If you're considering going forced-induction anytime soon, stick with the 3.91.