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Discussion Starter · #1 ·
http://forums.vwvortex.com/showthre...r)-and-Haldex-Working-on-AWD-Software-Upgrade
Discussions first began at this year’s SEMA Show when the EVOLVE team and a Haldex representative first discussed possibilites of developing product together. Haldex explained to EVOLVE that as they began development with Volvo on the S60R and V70R, the Volvo engineers insisted on considerable understeer (the tendency for a car to push into a turn with the front tires losing traction) in the factory set up. Although the S60R/V70R are performance oriented vehicles, Volvo wanted to stay conservative in regard to handling as an understeer condition is much more easy to control for an inexperienced driver than an oversteer condition (the tendency for the rear of the car to swing around with the rear tires losing traction). This is quite understandable considering the Volvo safety philosophy. However, for capable drivers that seek the ultimate in handling, a more neutral handling car will yield better cornering, more driving excitement, and quicker lap times.

After SEMA, the EVOLVE team meet with Ulf Ahlen (President, Haldex Traction AB) and Gabriel Beldie (Haldex General Manager, Detroit Office) to further discuss product development. It was decided that the next logical step would be to have Haldex show EVOLVE what can be accomplished by altering the software controlling the power distribution between the front and rear wheels. A date was set and preparations were made.

Haldex sent one of their software engineers from Sweden to meet EVOLVE at a racetrack near the EVOLVE office. A professional driver who does considerable evaluation work for Volvo and other manufacturers was called upon to assist in the development. Also joining them was a representative from VCNA who is intimately involved with S60R development.

The process started by the Haldex representative tapping his laptop directly into the Haldex unit under the car on a stock S60 R. With the interface in place, he had complete control over how, where and when the power was split between the front and rear wheels.

Most of the testing was performed on a wet skid pad in a controlled varying radius on a low traction surface, allowing for the most accurate evaluation.

After several hours of hard driving and a cooked set of Pirelli’s, Haldex proved to EVOLVE that far more neutral handling can be accomplished with software modification. By applying more power to the rear wheels under certain variables during cornering, understeer can be greatly reduced on Volvo AWD cars. They were able to feel distinct differences in the car's neutrality, particularly during throttle-on and return-to-throttle (from trailing-throttle or trailing-brake oversteer) situations. Mild throttle-on understeer is a good thing in most situations. It is the excessive understeer at turn-in and under acceleration that hurts laps times.

EVOLVE also learned that the S60 R will never be a drift car with big, throttle induced oversteer slides. This is due simply to the fact that Volvos are primarily front drive cars with power being sent to the rear wheels as needed. Haldex was quick to point out that their set up on the new Lamborghini Gallardo is a different story as it is a rear drive car with power being sent to the front as needed. There are certain limitations that software can never overcome.

EVOLVE has determined that the combination of a Haldex software upgrade and their soon to launch sway bars will yield the perfect balance all driving enthusiasts seek.

Although actual EVOLVE/Haldex software upgrades are still under development with no launch date set, this could prove to be a significant advancement in Volvo tuning.
I know on the VW Group platform the Haldex is locked away and upgrades were available for purchase a long while ago but were discontinued.

If any tuners haven't yet taken a crack at it, surely there is some refinements to be made in the naturally understeer bias that the S60r currently has.

Anybody have a failed unit for a teardown?
:thumbup:
 

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Volvo convinced Evolve that it would not be in their best interests to continue along that path.
 

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I would definitely be down for this. I asked the same thing a few months ago cause r32s have a haldex tuner...
 

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Do all volvos use similar haldex/software??
 

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Do all volvos use similar haldex/software??
There are 3 different generations of Haldex in Volvos that I know of. P1's and P2's have the 2nd Gen up until 2005. '06+ cars have the 3rd Gen. XC60's have the newest 4th Gen.
 

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So basically we'd have to talk a tuning company into doing two to three versions to hit the P1/P2 and the newer cars... :( Makes it less financially doable from a company standpoint. I'd still be down if someone was willing to do it. And if they made stronger angle gears and collars to go along with it...wowzers...
 

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i read on a vag forum there was a audi tt who had modified the haldex to have permanent all wheel drive, and the fuel milage got really horrible, and that was one of the reason it got discontinued.
 

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Discussion Starter · #9 ·
i read on a vag forum there was a audi tt who had modified the haldex to have permanent all wheel drive, and the fuel milage got really horrible, and that was one of the reason it got discontinued.
Haldex blue and Haldex orange controllers.

IIRC blue made it 50/50 but reverted to FWD when the brake was touched, and Haldex orange was 50/50 all the time
 
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