WRC Croatia Rally 2021

[scn]

I heard that they are warming up the brakes not to make them work but to keep them warm and to keep the whole wheel warm which helps retain the heat in the tires longer.

It makes sense because the time from Time Control to Start is 3 minutes.

[dimviii]

I don't know about WRC,

they need to warm up.There is no racing pad with same bite from 0 to 500-600 celsious.

[scn]

It's all fine, until something happens when warming the tyres like that.

Most important action against having an accident in the first corners are driving according to the grip you have. The best drivers in the world should be able to do that? Gryazin seemingly managed it in Croatia after his long hold.

At least in my country the past 30 years nothing has ever happened during warming tyres.
Especially 2WD cars without warmed up tyres can be very dangerous and can easily kid the driver that he has grip which he doesn't have. Also, on the level of WRC were races are lost for 0,6'' I don't think it is so real to ask from drivers to spend about 5-6 corners searching the level of grip.

As an aside note: If anyone thinks that it is possible to become rally driver, even a mediocre one, without violating many times the law and the modern advertised "correctness", he does not have the slightest reality about rallying. It is not possible. All drivers have acquired necessary skills, experience and competence in totally illegal and "incorrect" situations. Incidentally, as a side result, they have become safer in many illegal situations than the majority of average drivers are in legal ones. And all of them have been involved in situations in liaison sections where law had to go out of the window. All drivers have been outlaws many times. If anyone wants strict adherence to "correctness" and law, he is in the wrong sport.

[scn]

@dimviii

Carbone Lorraine RC6 and RC8 have a level curve and very high friction coefficient from low temperatures. I am not sure, but I have heard that some WRC teams use RC8 on tarmac.
Wilwood A have friction coefficient 0,55 from 35 degrees Celcius, which is already very high. Personally I haven't been able to detect any change in Wilwood A from the first corner to the last, even in crazy stages with 17 km continuous downhill sections. They lose some responsiveness at the end, but they are still as powerful as on the first corner. Pad technology has moved really a lot the past 15 years.
Please see the diagrams I attach.

[Mirek]

At least in my country the past 30 years nothing has ever happened during warming tyres.
Especially 2WD cars without warmed up tyres can be very dangerous and can easily kid the driver that he has grip which he doesn't have. Also, on the level of WRC were races are lost for 0,6'' I don't think it is so real to ask from drivers to spend about 5-6 corners searching the level of grip.

Last year Jan Černý managed to went into a ditch during warming tyres here and since then everybody is making fun of him for that

[dimviii]

@dimviii

Carbone Lorraine RC6 and RC8 have a level curve and very high friction coefficient from low temperatures. I am not sure, but I have heard that some WRC teams use RC8 on tarmac.
Wilwood A have friction coefficient 0,55 from 35 degrees Celcius, which is already very high. Personally I haven't been able to detect any change in Wilwood A from the first corner to the last, even in crazy stages with 17 km continuous downhill sections. They lose some responsiveness at the end, but they are still as powerful as on the first corner. Pad technology has moved really a lot the past 15 years.
Please see the diagrams I attach.

at your diagram shows that wilwood A while has 0,55 at 35 degrees,climbs to 0,67 when properly hot.Thats a huge difference
i know that technology mooves,i have tried almost everything in my evo from 2005,best so far without wearing discs is Carbotech xp 10.Impossible to fade them,even at 20-30 km downhill,or with repeat hard braking from 250-300km/h to full stop.Discs full red from glowing,pedal and feeling as the first brake.

[cali]

at your diagram shows that wilwood A while has 0,55 at 35 degrees,climbs to 0,67 when properly hot.Thats a huge difference
i know that technology mooves,i have tried almost everything in my evo from 2005,best so far without wearing discs is Carbotech xp 10.Impossible to fade them,even at 20-30 km downhill,or with repeat hard braking from 250-300km/h to full stop.Discs full red from glowing,pedal and feeling as the first brake.

Just an interesting question. How does an EVO get to a 300 kph and how long does it take?


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[dimviii]

Just an interesting question. How does an EVO get to a 300 kph and how long does it take?


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depents how powerfull it is,as to find a stock one is almost impossible.

[cali]

depents how powerfull it is,as to find a stock one is almost impossible.

Stock EVO 8 on a gravel woth stock tyres was max 190. Well I couldn't dare to go any faster anyways

But on tarmac after about 150-160 the engine just wasn't very good/powerful enough. The tuned ones had quite good turbo lag....

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[dimviii]

Stock EVO 8 on a gravel woth stock tyres was max 190. Well I couldn't dare to go any faster anyways

But on tarmac after about 150-160 the engine just wasn't very good/powerful enough. The tuned ones had quite good turbo lag....

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a stock evo 9 runs 0-200 at about 20 sec.A tuned one about 400bhp (reprogrammed ecu/exhaust/air filter) about 13-14 sec,we have seen and some good ones at 12,7-12,9 secs
evo 8 is a bit slower due to smaller turbo,5 speed vs 6 speed for evo9 and not variable timing for evo 8.
Both of them gain a lot with reprogrammed ecu and exhaust.
Evo 8 is not slow after 160km/h is slow after 200km/h due to big gap from 4th(200km/h@ 7000rpm) to 5th speed.
When you reprogram the evo 8 is not that a problem,because it has almost 80-100 bhp more which helps to accelerate quickly the long 5th speed.
about lag depents with what you compare.If you compare with vw group engines yes they are laggy,but vw engines run small turbos that they are not so good at high revs.
Generally lag is not a problem when you drive them quickly,because they have wide rev range,from 3000 rpm to more than 7000 rpm.Have in mind that when you reprogram them,except the big gains,they have a much better turbo spool,at low revs too.