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Performance Ambitions & Results  Top Gun in Dry Performance  Enduring-racing-type performance in lap times and in worn aspect after hard use.  Very.

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Presentation on theme: "Performance Ambitions & Results  Top Gun in Dry Performance  Enduring-racing-type performance in lap times and in worn aspect after hard use.  Very."— Presentation transcript:

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2 Performance Ambitions & Results  Top Gun in Dry Performance  Enduring-racing-type performance in lap times and in worn aspect after hard use.  Very competitive performance in damp conditions (and strong performance in wet conditions when proper additional grooving is applied).  Michelin Pilot Sport CUP tire brings you next to zero evolution over a club-race distance.  Lap times are consistent lap after lap.  Less performance dispersion -- Wear aspect and overall life are what you would expect based on lap time consistency--Pilot Sport CUP tire stays ready for more punishment.

3 Tread and Sidewall Design  Tread design must deliver the message!  Closed exterior shoulder for maximum dry handling.  Relatively open interior for damp/wet conditions.  Note: Pilot Sport CUP is NOT directional despite being equipped with angled lateral grooves. The angled blocks provide additional edges for damp conditions, but are not that efficient for lateral evacuation given the reduced tread depth at the shoulders.

4 Tread and Sidewall Design  Sidewall  New lettering unique to Pilot Sport CUP tire  Michelin logo  Obvious “Outside” markings  Sidewall includes necessary markings for worldwide utilisation

5 Features and Benefits  FEATURE: RACING-INSPIRED TREAD COMPOUNDING  BENEFIT: Superior Adherence and Handling  MECHANISM:  The Pilot Sport CUP’s tread compounds are formulated to have a maximum energy absorption (hysteresis) at competition operating temperatures (in the neighborhood of 70-104 °C). This is an appreciably higher temperature range than the efficient range for standard UHP street tires and provides improved traction and cornering grip for road racing situations.

6  The objective is to minimize dry adherence differences between Pilot Sport Cup and a slick race tire, while providing outstanding damp wet handling. This seemingly impossible task is made possible through the “tuned” stiffness of the tread pattern. Features and Benefits  FEATURE: RACING-INSPIRED TREAD COMPOUNDING  BENEFIT: Superior Adherence and Handling  DETAILS:  Compounding strategy in most cases is to use a coextrusion of two mixes to maximize overall wet /dry performance. The outside shoulder compound is optimized for dry handling, while the inside shoulder has more potential for wet adherence (although it is very efficient in the dry as well).

7  The tread compounds are mixed alongside our other high performance race mixes in the same plant in central France, and the tires themselves are made alongside our GT racing tires that do battle every weekend. Features and Benefits  FEATURE: RACING-INSPIRED TREAD COMPOUNDING  BENEFIT: Superior Adherence and Handling  DETAILS:  Compound tests at the track evaluated best lap times as well as consistency in lap times and tire wear. It’s the same attention to detail that breeds success in storied endurance races like the 24 Hours of Le Mans, the 12 Hours of Sebring, the Petit Le Mans--races where Michelin-equipped racers have dominated for years.

8  FEATURE: STABLE CENTRIFUGATION OF THE TIRE  BENEFIT: Consistent performance particularly at high speed  MECHANISM:  Centrifugation performance as measured by the growth of the tread diameter and the change in the transverse curvature of the tire’s crown with speed is improved. The idea is to minimize the evolution of the contact patch with speed, ensuring consistent track performance and excellent tire wear--both at the track and on the street. Features and Benefits

9  Rigid belt package (steel + polyamide) impedes the change in diameter and assures a consistent growth across the width of the tire.  DETAILS:  Reduced tread depth and tapered tread profile minimize the centrifuged mass.  FEATURE: STABLE CENTRIFUGATION OF THE TIRE  BENEFIT: Consistent performance particularly at high speed Features and Benefits

10  Recall that Pilot Sport production tires have been used to establish FIA high speed vehicle records on closed circuits.  Test conditions include 100% of rated tire load for the given tire size, 2,48 bar cold starting pressure.  Internal testing of high speed capability shows remarkable gains of 50 km/h versus the already-impressive Pilot Sport tire.  FEATURE: STABLE CENTRIFUGATION OF THE TIRE  BENEFIT: Consistent performance particularly at high speed  DETAILS: Features and Benefits

11  FEATURE: OPTIMIZED CROWN ARCHITECTURE STIFFNESS  BENEFIT: Extreme Cornering Power for Rapid Steering response and Confident Cornering  MECHANISM:  Overall stiffness of the internal architecture is increased (versus Pilot Sport). The result is quicker steering response and a reduced rear axle slip angle for equivalent lateral acceleration. A driver corners with more confidence when the rear slip angle is diminished, and the yaw response of the vehicle is quickened appreciably. Features and Benefits

12  DETAILS:  Asymmetric tread pattern delivers a boost in cornering power.  Tread depth is approximately 5 mm in the center of the tread pattern with a taper to 2.5 mm at the shoulder edge of the contact patch.  Belt package was inspired by our endurance racing tire developers and finely honed at the track.  FEATURE: OPTIMIZED CROWN ARCHITECTURE STIFFNESS  BENEFIT: Extreme Cornering Power for Rapid Steering response and Confident Cornering Features and Benefits

13  FEATURE: STABLE CENTRIFUGATION OF TIRE  Photos compare Pilot Sport (black) and Pilot Sport CUP (red)  Pilot Sport CUP grows less than the world-class Pilot Sport between 0 and 300 km/h! 225/40 18 v=300 km/h225/40 18 profil gonfle 0 km/h300 km/h

14 Care & Feeding of Pilot Sport CUP  PRESSURES  SUSPENSION ALIGNMENT  TEMPERATURES  HEAT CYCLING  SHAVING  RECUTTING FOR HEAVY WET CONDITIONS

15 Care and Feeding  PRESSURES  General Guidelines:  Road Racing :  1,72-1,93 bar cold (front/rear)  2,2-2,48 bar hot (front/rear) is your typical target  Autocross (slalom): Looking for same range (of hot pressures-- may need to start at higher cold inflation pressures because of the decreased pressure gain in autocrossing).  Road: OE pressures  Rain: For both autocross and road racing, you may have to increase tire pressure 0,4-0,7 bar from what you would normally run in dry conditions. Your car and driving style in the wet is important here, so some experimentation may be in order.

16 Care and Feeding  ALIGNMENT  Negative camber should be targeted between 1.5 to 3 degrees with a maximum of 4 degrees. Do not get too crazy here.  TEMPERATURE  The sweet spot of the tread compound is in the range of 70-104 °C. Adjust the suspension settings of your car and the tire pressure in order to maximize performance. You know the drill: Experiment with one axle at the time. Do NOT change too many variables at one time.

17 Care and Feeding  HEAT CYCLING (Primarily US Market):  Heat cycled tires may come up to operating temperature slightly quicker than non-heat cycled tires, and on some cars we have noted a marginal improvement in lap times (maybe.1-.2 sec in a 38-40 sec autocross environment) and in tire wear. The improvement is not always obvious.

18 Care and Feeding SHAVING (Primarily US Market):  Pilot Sport Cup starts life at 5mm (center tread depth)  Michelin testing shows that a shaved tire at 3mm offers slightly more grip from the start of the competition life of the tire.  Time differential between shaved/heat cycled @ and full tread depth/heat cycled is 0.5-0.6 seconds on a typical 35-38 sec autocross course. These are statistically-sound results; your results may vary.

19 Care and Feeding SHAVING (Primarily US Market):  The consumer must decide if he/she is willing to give up 2.5mm of tread life and the cost of shaving in exchange for a potential 0.6 seconds – it depends on how serious you are about your time spent at the track.  All things considered, the absolute quickest time will likely be achieved by shaving and heat cycling the Pilot Sport CUP.

20  You can recut  Outside rib in zig-zag 5 mm wide and 4 mm deep  2nd and 3rd ribs lateral grooves, 7 mm wide and 5 mm deep  DON ’T GET CARRIED AWAY!  INSIDE RIB LATERAL GROOVE  DO NOT RECUT  THE CIRCUMFERENTIAL GROOVES  Recutting  To optimize deep water performance, you may recut Pilot Sport CUP in the following way: Care and Feeding

21 Currently available sizes in Pilot Sport CUP  205/50ZR15 (product number 87934)  225/50ZR15 (product number 88168 – launch April’03)  205/55ZR16 (product number 70213)  225/50ZR16 (product number 70436)  245/45ZR16 (product number 90104 – launch April’03)  205/50ZR17 (product number 93434)  225/45ZR17 (product number 77719)  255/40ZR17 (product number 61585)  225/40ZR18 (product number 87503)  265/35ZR18 (product number 60480)  285/30ZR18 (product number 81118 – launch April’03)  295/30ZR18 (product number 80852 – launch April’03)  315/30ZR18 (product number 86838 – launch May’03)  345/30ZR18 (product number 81504 – launch May’03)

22 Michelin Pilot Sport CUP Data Sheet

23 Pressure Setting Guidelines for certain Porsche Tire/Vehicle Combinations

24 Stuff that a racer needs to think about...  First of all, remember that the following recommendations are trends. Providing exact solutions is tough. Specific vehicle characteristics, wheel loads and/or driving styles have a big impact on the behavior of the tire/vehicle system.

25 Stuff that a racer needs to think about...  Another thing to remember: Bigger isn’t always better, both in terms of ease of driving and in terms of lap times.  If you take the time to look at the typical FIA GT or ALMS (prototype, GTS, or GT classes) tire/wheel combination, you will see that—even if the rules permit it—overly “fat” tires are rarely used.

26 Stuff that a racer needs to think about...  Bigger isn’t always better, both in terms of ease of driving and in terms of lap times.  Frequently, the tire looks “stretched out” on the application wheel, forming what looks to be a “trapezoidal” cross-section, with the tread width close to or less than the width of the tire’s beads. This is because of the simple fact that a “high-tension” tire shape is more efficient, in most cases, than a fat, “low-tension” shape.

27 Stuff that a racer needs to think about...  What does this mean for you?  Well, if you are confronted with the choice of squeezing a big tire onto its minimum recommended wheel width or stretching a smaller tire onto a relatively wide rim, you might want to pause for thought.

28 Stuff that a racer needs to think about...  We have found the smaller-tire + wide-rim combination, with its accompanying “high-tension” inflated shape, can be more efficient:  More direct yaw response Decreased “phase lag” between steering wheel input and vehicle turn-in  Less “overshoot” at corner exit Less of a tendency to “wiggle” at corner exit (thus upsetting the car) when you roll back into the throttle  Can result in decreased negative camber requirements, thus increasing braking and accelerating efficiency  Can improve vehicle response to air pressure tuning

29 205/50-15 & 225/50-15 on older, lighter 911s  Rear axle slip angle and cornering power:  Little effect on rear axle slip angle from rear pressure, especially above 2,2-2,4 bar hot  Little to no effect on rear axle slip from front pressure changes  Overall vehicle handling behavior and cornering attitude:  Big effect from front pressure changes:  at low g ’s (typically slow corners), higher = more understeer  30-35% decrease in gain between 1,8-2,62 bar  at high g ’s (typically faster corners), higher = less understeer  5-10% increase in gain between 1,8-2,62 bar  Little effect from rear pressure, especially above 2,2-2,4 bar hot

30 205/50-15 & 225/50-15 on older, lighter 911s  Overall Recommended Hot Pressures:  Front: 2,2-2,4 bar  Rear: 2,2-2,4 bar  Driver/vehicle combo dictates the split!

31 205/55-16 & 225/50-16 on pre-964 and 964-chassis 911s  Rear axle slip angle:  Little effect on rear axle slip angle from rear pressure changes  Little effect from front pressure changes at low g ’s (typically slow corners), but lower front pressure tends to be favorable at high g ’s  Overall vehicle handling behavior and cornering attitude:  Big effects from front pressure changes: low pressure favorable  Steering gain decreases 25-30% between 26psi and 38psi  In high-g corners (more tire load), required steering input decreases 20-25%  Little effect from rear pressure changes  Although the rear axle should still be looked at to adjust driver “feel”

32 205/55-16 & 225/50-16 on pre-964 and 964-chassis 911s  Overall recommended hot pressure targets:  Front: 1,8-1,93 bar  Rear: 2,2-2,4 bar

33 225/50-16 & 245/45-16 on Porsche 944/944 Turbo  Rear axle slip angle:  Little effect on rear axle slip angle from rear pressure changes at low g ’s (typically slower corners). At high g ’s, decreasing the pressure will reduce the potential of the rear axle.  Little effect on rear axle slip angle from front pressure changes (unlike for 911s!)  Overall vehicle handling behavior and cornering attitude:  Little effect from front pressure changes, except at high g’s  A bit more effect from rear pressure changes, but the 944 chassis (in stock form) tends to “dampen” the effect of pressure changes  Overall recommended hot pressure targets:  Front: 35-38psi  Rear: 26-30psi

34 225/40-18 & 265/35-18 on Porsche Boxster  Rear axle slip angle:  Decreasing the rear pressure will increase the potential of the rear axle  Little effect on rear axle slip angle from front pressure changes  Overall vehicle handling behavior and cornering attitude:  Big effect from front pressure changes  20-25% decrease in steering gain (more understeer) between 26-38psi  Big effect from rear pressure changes: increasing the pressure will tend to reduce the understeer  Overall recommended hot pressures targets:  Front: 32-34psi  Rear: 36-39psi

35 225/40-18 & 285/30-18 on Porsche 996  Rear axle slip angle:  Decreasing the rear pressure will increase the potential of the rear axle  Little effect on rear axle slip angle from front pressure changes  Overall vehicle handling behavior and cornering attitude:  Big effect from front pressure changes  Steering gain decreases 20-25% between 26-38psi  Small effect from rear pressure changes: increasing the pressure will tend to reduce the understeer slightly  Ov erall recommended hot pressure targets:  Front: 32-34psi  Rear: 37-40psi


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