60/40 - Quattro

[DaytonaGreyRS4]

60% of the power goes to the rear wheels, and 40% goes to the front.

Is this how the new Quattro System works ?

Anyone have a review I can read.

Thanks in advance.

[mi021le]

i know its a haldex (?) awd system controled. but not sure how they seperate the awd. the mechanics of it.

[DaytonaGreyRS4]

Originally posted by mi021le
i know its a haldex (?) awd system controled. but not sure how they seperate the awd. the mechanics of it.

I hear the AWD-train loss is significant at higher speeds ?

So I'm hoping More Power To The Rear Wheels should help quite a bit!!

[CarbonFibre]

The Haldex system is the one used in the transverse engines and mostly acts as front-wheel drive until slippage occurs. A car that uses this is the TT among others. Most Audis use a Torsen system that has a 50:50 torque split but the new Torsen 3 such as in the new RS4 uses a 40:60 split front:rear.

[SoCal]

For tecnical information (in detail) check out:

http://www.torsen.com/files/Traction_Control_Article.pdf

and http://www.torsen.com/general/general_faq.htm

A good article comparing different types of AWD (esp Haldex v. TorSen) in plain English is at:

http://www.rallycars.com/Cars/4wd_turbo_cars.html

Power loss in the TorSen differential (used in Audi quattro) results from greater heat transfer under heavy loads. The gears generate heat from friction.

Pretty ingenious system IMO.

[Inline Six]

Didn't Audi start using rear-biased quattro system back in the RS2 days?

[alex_s3]

Originally posted by NB7RS4
I hear the AWD-train loss is significant at higher speeds ?

So I'm hoping More Power To The Rear Wheels should help quite a bit!!

I think its 40/60 so the car dont understeer sow much like the older RS4..

[Audihead]

Originally posted by alex_s3
I think its 40/60 so the car dont understeer sow much like the older RS4..

Bingo, Audi wants the cars to handle more like a rear driver. The 40/60 rear bias will slowly filter down the whole range of cars. I believe the Q7 is the second to get this adjustment. It may go back to 50/50 in the future when they move the motors back over or behind the front axle. The A3 and the TT are using the Haldex system. The rest of the lineup is still using Torsen.

[Speedou]

Hmm...why I tought the new A6 allready have that 60/40?

[Erik]

The new 40/60 system for S and RS models has nothing to do with Haldex.

BTW, did you know that the Porsche 959 had a 40/60 distribution. :hahahehe:

[India Whiskey Charlie]

Originally posted by Erik
BTW, did you know that the Porsche 959 had a 40/60 distribution. :hahahehe:
I'm not sure if that's correct. IIRC, the torque split was variable with maximum 20%F/80%R depending on the road conditions.

[Erik]

Originally posted by Viken B.
I'm not sure if that's correct. IIRC, the torque split was variable with maximum 20%F/80%R depending on the road conditions.

Yes, but standard was 40/60. The Audi quattro varies as well. ;)

[India Whiskey Charlie]

Originally posted by Erik
Yes, but standard was 40/60. The Audi quattro varies as well.
I may be remembering wrong, but I thought it was 0F/100R in a straight line and up to 20F/80R under certain conditions.

[DaytonaGreyRS4]

Originally posted by Audihead
Bingo, Audi wants the cars to handle more like a rear driver. The 40/60 rear bias will slowly filter down the whole range of cars. I believe the Q7 is the second to get this adjustment. It may go back to 50/50 in the future when they move the motors back over or behind the front axle. The A3 and the TT are using the Haldex system. The rest of the lineup is still using Torsen.

Got it, but obviously the drivetrain loss is the same as a regular AWD car then ?

[Erik]

Originally posted by NB7RS4
Got it, but obviously the drivetrain loss is the same as a regular AWD car then ?

Yes, sure.

[DaytonaGreyRS4]

Originally posted by Erik
Yes, sure.

I'm not sure, that's why I'm asked...! Can you change my screen name to SprintB7RS4 :applause: