23 Pirelli Slicks vs Trofeo Rs

Cover for Pirelli Slicks vs Trofeo Rs

Finally a reliable test conducted by a proper racing driver, Romain Monti (for Motorsport Magazine), to establish what arguably is one of the most debated and used fact to compare racing cars laptimes with road legal ones.

Quantify the difference between a laptime on slick tyres and on Pirelli's most performing road tyres. The result is less than 1 second per minute of track time.

 

1m ago by manone
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DrDuke  1m ago

116.5s - 114.63s = 1.87 sec

 

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manone  3w ago

correct. and 116.5/60=1.94, so that 1.87sec/1.94=0.96 sec, which is less that 1 sec per minute.


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DrDuke  3w ago @manone

You mean one minute lasts 60 seconds and the other minute 59 secs? (Are we talking about relativity theory or cars? :D )

Or if you take a car with a lap time of 90 seconds on semis. It will be 1.5 secs faster on slicks?

The right formulation would be: car A needs 60 seconds for distance X while car B needs 59 secs.

A race track has a distance. The car has an average speed on this track. A higher average speed results in a lower lap time. In this case the slick car is 1.63% faster. Another way to say it is the time advantage per distance. In this case 0.42s/km. This makes it possible to get a rough guestimate for other similar tracks. The time advantage between sport/semis or semis/slicks is in most cases between 0.5-1s/km.


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SpeedKing  3w ago @DrDuke

The calculations apply only to Magny Cours which is a moderately fast track. Time differences per minute will vary depending on whether it's a slow or fast track. So there will be a bigger percentage time difference on a slow track with lots of corners than say a fast track like Spa.


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manone  3w ago @DrDuke

"Or if you take a car with a lap time of 90 seconds on semis. It will be 1.5 secs faster on slicks?

The right formulation would be: car A needs 60 seconds for distance X while car B needs 59 secs."

yes. one needs to normalize the lap time difference to something, whether it be a distance or a time. or else you end up comparing the difference between a 1 minute driving to a 7 minutes driving and find them inconsistent.


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DrDuke  3w ago @manone

Lap times are already tied to lap distance. Otherwise you couldn't compare anything. A lap time without a reference to a track has no meaning.
What you did is not wrong - the statment has just less value than the two lap times. You removed the distance information. The distance is the only thing which is for all cars (or lap times) the same. Nothing against math-porn but most people prefer useful numbers.

Mostly the question are: "how much faster am I with a better tire?" and "How much would that be on another track?"


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manone  3w ago @DrDuke

i am not sure whether it is better to normalize a lap time difference to distance or time. You think it is better to normalize to distance? i am leaning towards time. If you normalize to distance and one track's speed is 80kph of average and the other 200kph for the same cars, the data cannot be compared.


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DrDuke  8h ago @manone

https://imgur.com/a/sYSPh0D


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Cocobe  1m ago

to be fair, not all slicks are created equal. Even formula 1 “hard” slicks, and soft formula slicks can have 2-3 seconds difference.

Also, that a car with less hp will see much less difference between slicks and trofeo R than a car that has a lot of power. And tbh I bet that mundane slicks are actually more durable than your regular competition road tires.


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SpeedKing  1m ago

What would be even more interesting is a semi-slick tyre lap time comparison between TrofeoR's vs Cup2R's vs Goodyear F1 3R's.


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FastestLaps  1m ago

Modern road legal "track tyres" are indeed close to slicks in performance. 10-15 years ago I think there were no such tyres, which could be part of the reason why older "hypercars" like Enzo, Carrera GT, MC12 etc often have slower lap times than more mundane modern sportscars.