Technical Analysis: WRC Cars 2017

[Rally Hokkaido]

This month's Racecar Engineering features a technical analysis of the Hyundai i20 Coupe WRCar.
http://www.racecar-engineering.com/c...form=hootsuite

Also, they have done one of the Fiesta.
http://www.racecar-engineering.com/c...form=hootsuite

[seb_sh]

Seems like you are the only one with a solution. Almost everyone else knows what is wrong with the analysis of Matt Somerfield but no one can do any better.
Typical pessimism of hardcore enthusiasts. The future awaits those who are willing to adapt.

This month's Racecar Engineering features a technical analysis of the Hyundai i20 Coupe WRCar.
http://www.racecar-engineering.com/c...form=hootsuite

Also, they have done one of the Fiesta.
http://www.racecar-engineering.com/c...form=hootsuite

There you go, two proper articles instead of that dribble disguised as an analysis.

[dimviii]

which rallies are more demanding at brakes?

http://www.brembo.com/en/company/new...ionship-brakes

[Mirek]

This month's Racecar Engineering features a technical analysis of the Hyundai i20 Coupe WRCar.
http://www.racecar-engineering.com/c...form=hootsuite

Also, they have done one of the Fiesta.
http://www.racecar-engineering.com/c...form=hootsuite

Sadly both articles operate with nonsential number about the engine. I understand that the real data are secret but in my opinion it is better not to spread clear nonsense. For example 450 Nm of torque and 380 Hp is mathematically impossible combination unless the engine has it's torque peak at the power peak and only at 6000 rpm.

Otherwise it is nice to see all those detail photos which are very interesting.

[seb_sh]

Article on the Citroen, also from Racecar Engineering: http://www.racecar-engineering.com/cars/citroen-c3-wrc/

[N.O.T]

Article on the Citroen, also from Racecar Engineering: http://www.racecar-engineering.com/cars/citroen-c3-wrc/

so british motorsport journalism is now copy pasting older interviews of team managers and also posting magnified pictures and describing what they see in those pictures like 5 year olds...

As the cherry on top, the person who writes about a rally car has a picture of him inside a single-seater...

why they bother anymore ?

[Mk2 RS2000]

so british motorsport journalism is now copy pasting older interviews of team managers and also posting magnified pictures and describing what they see in those pictures like 5 year olds...

As the cherry on top, the person who writes about a rally car has a picture of him inside a single-seater...

why they bother anymore ?

A very good question, the only possible answer that I can come up with is, "to satisfy the minions with even less intelligence than themselves"

[GravelBen]

which rallies are more demanding at brakes?

http://www.brembo.com/en/company/new...ionship-brakes

Some interesting stuff, apart from the nonsense about "WRC Plus cars"

[NickRally]

Hi boys and girls, I have been lurking around here for some time, but this is my first post. I work as a design engineer in the motorsport industry and what better place for this first post than in the technical analysis thread.

Mirek’s post inspired me to see how close I can get to a real internal combustion engine power and torque curves using the values of 380hp and 450Nm without actually having the two numbers at the same rpm. The result is not too bad, please see below a graph and tabulated numbers:

WRC 2017 power curve 1.JPG
WRC 2017 power numbers 1.JPG

This is not dissimilar to modern turbocharged engines, like the ones from the BMW range for example, graphs shown below:

six-cylinder-petrol-engine-torque-curve-Z4-sDrive35i-en.jpg.resource.1373899668943.jpg
m2-torque-curve-en.jpg

And finally, just to clarify, I am not claiming my graph is what the 2017 WRC engine power curve is, but just to check if the two quoted numbers for the 2017 WRC engines can live together happily.

Regards,
Nick

[Mirek]

The torque and power curves of engines with restrictor look usually different way. Please note that stock engines are not restricted therefore their curves have very different shape. With restrictor the torque usually steadily decreases from its peak so that the power is roughly constant in relatively large power bent. I admit I haven't seen a single dyno chart for 1.6T WRC car but from 2.0 WRC, R5 or gr.N I think I have at least some idea.

This is Fiesta R5 dyno chart (comparison R5 to R5 Evo):



The peak power in absolute numbers is around 300 Hp and the torque around 400 Nm if I remember well. The rise of torque with the Evo is caused mainly by turbo pressure tuned closer to the allowed limit.