WRC ADAC Deutschland Rallye 2018

[dimviii]

Not sure if this was mentioned already, apparantly Tanak ran with 30/70 middle diff mapping. To be honest I find it hard to believe, such a big difference, car must be hard to control. What are the technical guys here on the forum thinking about this?
https://www.rallye-magazin.de/wrc/ar...ak-so-schnell/

mapping cant be 30/70 or 50/50.
electronic center diffs distribute the power/torque continiously depenting at which point of corner is the car
the 50/50 or 30/70 distribution is from gears,and not mapping
that can change only with different gears
Of course from mapping you can transform the behaviour of the car,but that is something different
probably the author something didnt understand or lost in translation

[HaCo]

The term used is Kraftverteilung, literally translated force distribution.

[EstWRC]

I tried to find the original article on Motorsport aktuell but no luck

[Oppositelock]

It looks like the author(s) mixed it up a little bit.

In "Motorsport aktuell" and in "Rallye Magazin" (quoting Motorsport aktuell) it says Tänak had "70 Prozent Kraft auf der Hinterachse" meaning "70 per cent of power on the rear axle" with reference to the centre diff (without going into detail whether electronically or mechanically achieved).

Any engineer here who can shed some light on how it really works in a 2017 car?

[NickRally]

As dimviii pointed, the basic torque split is determined by the gearing and this basic torque split is only applicable when the hydraulic (or another) lock is not applied. Once lock is applied, torque can flow in different proportion, being determined by the amount of diff lock and grip/resistence at each axle.
But to return to the original question, I can believe that Tanak used 30/70 mechanical split on this tarmac rally, providing more of a "classic" race car handling.

[EstWRC]

thanks for the answers, very interesting.

[dimviii]

But to return to the original question, I can believe that Tanak used 30/70 mechanical split on this tarmac rally, providing more of a "classic" race car handling.

Nick this is a lot complex to change,needs new homologated gears,and its something that will change drastically the whle car behaviour.Do we know if toyota has homologated new center diff gears?
If not,Tanak just used a more rear based maps at center diff.

[NickRally]

Sorry dimviii, I should have clarified that when saying I can believe he used the 30/70 split, I was referring to the actual race car physics, but you are a lot more knowledgeable about the homologation and logistical matters, that could have prevented runninf it.

[EstWRC]

In Rally Germany the increased driveability of the engine has a strong influence on the performance, the team and the drivers were very happy with the upgrades. Tanak chose a different torque split to the other drivers.

In tarmac configuration the drivers have a choice in the two homologation torque splits, with 50% or 72% to the rear, as selected by driver preference and expected road conditions, Ott selecting the 72% option.


https://rallysportmag.com/wrc-preview-rally-turkey/

[EstWRC]

Neuville didnt cut the corner at all this year where he lost the wheel last year https://www.youtube.com/watch?v=cBf_YLNUFDk