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Go Back   REVscene Automotive Forum > Technical Discussion > Maintenance, Engine & Driveline Tech

Maintenance, Engine & Driveline Tech This forum is brought to you by The Speed Syndicate (TSS) in Burnaby.
Discussion of maintaining your engine, transmission, differentails, rear ends, and mods associated with "driveline" parts..

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Old 11-14-2010, 03:14 AM   #26
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I think you are confused with biased and based.

Bias means the difference in power the drive train can distribute to front back and/or left or right with the latest electronic (torque vectoring) differentials. Since to fully vary bias requires near infinite number of gear and clutch sets, all manufacturers only include a fixed number of combinations. Since BMW, Mercedes etc are RWD based (ie their front axle drive unit feeds directly from the main shaft via a seperate box and shaft), they are biased towards the rear.

Audi is typically (excluding transverse engined ones like the A3) longitudinally FWD based ie their engine layout is longitudinal over the front axle (hence people complain their V8 sedan/coupe steering as horrible), rear shaft sticks out from the back of the FWD gearbox. Subi uses a similar layout as the Audi but their engine is behind the front axle (because of their smaller engine size) and lower mass (boxer). Mitsu, Audi the drivetrain are FWD based ie basic models are FWD versions when the AWD components are not installed... in this vein, the same goes for VW, Volvo, Honda etc (however the layout is transverse like the A3). That's why they are typically FWD biased because you loose quite a bit of efficiency driving the rear drive set.

The reason why I say Subaru is falling behind is because they are the only one that uses their gearbox. They have to get their MPG up and they select the economy optimized but performance / maintenance complex CVT.

Originally Posted by minimebang View Post
Audi is FWD base. subie and mitsu can be change by a button. BMW is RWD base if on a xi model.

Last edited by godwin; 11-14-2010 at 03:34 AM. Reason: clarity
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Old 12-07-2010, 12:49 PM   #27
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Originally Posted by shenmecar View Post
DONT FORGET! TIRES are just as important!
Tires are more important IMO. My 240sx is RWD and I can tell you first hand that Falken Azenis are horrible in ice and snow.
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Old 12-16-2010, 03:03 PM   #28
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Wow, so much for the simple answers...

The Subaru's a good/not-too-expensive option. If you buy a manual shift, the power's split front to rear across an limited slipping transfer case. That's 50:50 under normal, static driving (static=not lighting the tires up, or doing donuts). It'a a passive system that you can expect to always do the same thing.

If you get the automatic, it's mostly (maybe all?) front wheel drive until you slip, then the rears take up the load.

Don't listen to all the FWD fanboys. A proper awd platform will completely eliminate your dreaded slip going uphill. Also, flooring it coming out of a turn feels more natural when you're putting down power at both ends. As a bonus, you'll be able to do proper, powered donuts and drifts in the snow and gravel.

Last edited by timbits; 12-16-2010 at 03:10 PM.
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