Technical Analysis: WRC Cars 2017

[dimviii]

vents to rear diff probably,ds3 wrc had also too

[Mirek]

The trailing edge of the floor at the junction of the rear wheel arch on the Hyundai seems to have a diffuser like profile. Ie, the section of floor between the front and rear wheel arches ends with a curved profile at the rear. Possibly the Toyota also?

Yes, it looks like that

[kiil]

I wouldn’t be surprised if, of the two pipes on the Fiesta leading to the brake system, one is delivering air to the centre of the disc and the other to the calliper.

Exactly, saw this in Monte.

[Marcco]

It's also interesting that Hyundai has the air intakes so high under the windows. I guess that it must be to prevent dirt coming into the air channel.

I think it's because doors are too close and there are simply no space to put it anywhere else.

[NickRally]

Thanks kiil.

Ctesibios, on the Toyota this is the exit for the side Venturi tunnels ( http://www.geocities.ws/rallytech/ae...20Aero%202.JPG ) unless of course they use some convoluted ducts to exit the air from the side Venturi tunnels through the grills behind the rear wheels.
On the Hyundai, they appear to have very small diffusers/curved sections at the trailing edge of the side horizontal doorsills/splitters as you pointed out.

[Sulland]

Sensors:
How many places in engine and other places does the 2017 cars have sensors giving data to teams and in the cars?
Are all sensordata being transmitted to team HQ, or only the most important data?

[makinen_fan]

The sensors (and their number if duplicated) that you can use in engine/centre diff strategies is controlled by FIA. Monitoring sensors are free.
If you mean telemetry, you are not allowed to transmit anything from car to service. Data exchange is only in media zones before service, in the form of usb/memory card.

[NickRally]

To add to the Toyota analysis and also to my musings on the possibility of there being small Venturi tunnels ahead of the front wheels, well the image of the Yaris below shows there are no such tunnels there. Will keep an eye for good images of the other cars to see the arrangements in this area, though I suspect very unlikely for any of them to have these.

http://www.geocities.ws/rallytech/ae.../Yaris%208.htm

Yaris Aero 8.JPG

[sonnybobiche]

Can we talk about the complex, downforce-generating wing mirrors that the Yaris debuted with, which very late in testing actually disappeared from the car altogether, and which eventually came back as the simplified single-plane ones that actually got homologated?

I read a translated finnish interview with Makkinen where it was clear he was angry about having to deal with last-minute changes to the aero regulations. Anyone want to bet one or another team saw the wing mirrors, got super envious, and filed a 'request for clarification' with the FIA?

[Mirek]

I don't think that the mirrors make so much difference.