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F22 / F23 2 Series (2014 - Current)
The 2 Series coupe is the replacement for the E82/E88 1 series coupe. Production starts in November 2013 on the 228i (N20) and M235i (N55) coupes. Look for them in dealerships in February 2014. The convertible F23 2 series will follow in the fall of 2014.

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  #1  
Old 01-19-2017, 05:55 PM
cowboy mania cowboy mania is offline
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bmw X-drive vs. M2's differential

I -drive am trying to determine if the M240i with X-drive would offer the same benefits as the M2 which has a more advanced differential?
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  #2  
Old 01-20-2017, 02:10 AM
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Zooks527 Zooks527 is offline
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What are you asking? What benefits are you looking for?

The M2 has a the "Active M Differential", a clutch-based rear differential that uses the wheel speed sensors to determine clutch lock. The LSD will try to match the speed on the two rear wheels. Unlike a mechanical LSD, an Active M differential doesn't need some traction at both wheels. Should one wheel be on the theoretical infinitely slippery surface (or be off the ground), both wheels will spin at the same speed with up to 100% of the engine torque going to the ground at the wheel with traction. In a curve, it's easy to get both rear wheels freely spinning to allow the rear end to slide out.

An xDrive has an open differential on both axles with a clutch based transfer case in the middle. The transfer case functions to match the speeds of both axles. The brakes are used to individually create drag at each wheel to allow the open differential to spin the opposite side wheel on the same axle. Should three one wheels be on the theoretical infinitely slippery surface (or be off the ground), the one wheel that has traction will apply up to 50% of the engine torque to the ground at the wheel with traction. If there are a varying number of wheels without traction, up to 100% of the engine torque can be applied to the ground (where both wheels on at least one axle have traction). In a curve, it's harder to break the rear end free, as the transfer case will continually vary the center clutch to keep all 4 wheels rotating at the same speed.
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Last edited by Zooks527; 01-20-2017 at 02:54 AM.
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Old 01-20-2017, 05:17 AM
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mecodoug mecodoug is online now
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Great explanation Zooks. Apples and Oranges. There is also a weight difference.
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Old 01-20-2017, 05:44 AM
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Zooks527 Zooks527 is offline
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Quote:
Originally Posted by mecodoug View Post
Great explanation Zooks. Apples and Oranges. There is also a weight difference.
About 150 lbs extra for an xDrive over a standard M240i, IIRC, but I'm not sure of the difference against an M2. About the same as riding around with a passenger most of the time. Biases the weight forward a bit as well.
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2015 M235xi coupe, Black Sapphire Metallic, Black Leather, Fineline Stream trim, Steptronic, xDrive, ZPP, ZTP, ZCW, ZDA, ZDB, 5DP, hk w/ BimmerTech amp, Enh. BT
Ordered 3/12/15, Off the line 4/7/15, Delivered 5/14/15




Prior 40 years of cars: 1967 BelAir wagon / 1968 LeMans Tempest / 1970 Mustang Mach 1 / 1972 El Dorado / 1978 Corvette / 1981 Subaru GL wagon 4WD / 1983 s10 Blazer 4x4 / 1985 Bronco 4x4 / 1996 Bronco 4x4 / 2004 Passat 4motion / 2009 BMW 335i xDrive E92

Last edited by Zooks527; 01-20-2017 at 07:14 AM.
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Old 01-22-2017, 06:03 PM
cowboy mania cowboy mania is offline
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X-drive

Thanks. I understand. I wasn't sure if the X-drive offered the same performance potential as the M2's differential. So performance and weight wise, the M2 has the advantage. Thanks for your help.
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Old 01-24-2017, 10:54 PM
Wreckitrob Wreckitrob is offline
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All dependant on what type of climate and if ur going to track ur car. If u live where there's snow, xdrive. If u plan to track ur car then m2. Every day commuter, m235. I have a m235 xdrive with stage 2 dinan. Just smoked a m2 a week ago. My upgrade cost was only 2G for more whp and wtq.
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Old 01-27-2017, 08:28 AM
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USA-RET USA-RET is offline
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Straight line, the XDrive is very close or equal to the M2. M2 is a track car. Rough riding, but excellent if the track is where you spend your recreation time. XDrive is a much better riding car for daily use (especially if you have to deal with snow or icy conditions).

Standard M240i is only a couple of 10ths slower than the M2 straight line on paper but easier to live with daily. If you watch some videos, it appears to be closer than that when matched on the road against an M2.

If you plan to race your car at a drag strip, you'll likely see the M2 edging the M240i out and perhaps the Xdrive. Adding a tuner to either the M240i or the Xdrive will switch the results.

For most of us, the only measure we have for a car's performance is straight line acceleration.
XDrive is very close to the M2 straight-line. If you track or AutoX your car, than other items will come into play.

Just my perspective
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