Malaysia Sepang - Braking Analysis

[bar555]

2009 DATA


Length: 5.543 km
Number of laps: 56 (310.408 km)
Type of brakings: medium
Number of brakings: 8
Pole 2008: F. Massa – 1’35’’366
Pole 2009: J. Button – 1’35’’181
Difference : 0’00’’185
Time spent under braking per lap: 16%


Kurve 1
Initial speed 2009 : 299 Km/h
Initial speed 2008 : 303 Km/h
Difference : - 4 km/h
Final speed 2009 : 106 Km/h
Final speed 2008 : 89 Km/h
Difference : + 17 km/h
Stopping distance 2009 : 116 m
Stopping distance 2008 : 141 m
Difference : - 25 m
Braking time 2009: 2.33 seconds
Braking time 2008 : 3.0 seconds
Difference : - 0.67 seconds
Maximum deceleration 2009 : 4.75 g
Maximum deceleration 2008 : 4.2 g
Difference : + 0.55 g
Maximum pedal load 2009 : 123 Kg
Maximum pedal load 2008 : 126 Kg
Difference : - 3 kg


Kurve 2
Initial speed 2009 : 124 Km/h
Initial speed 2008: 123 Km/h
Difference : + 1 km/h
Final speed 2009 : 82 Km/h
Final speed 2008 : 72 Km/h
Difference : + 10 km/h
Stopping distance 2009 : 29 m
Stopping distance 2008 : 33 m
Difference : - 4 m
Braking time 2009: 1.06 seconds
Braking time 2008 : 1.2 seconds
Difference : - 0.14 seconds
Maximum deceleration 2009 : 1.64 g
Maximum deceleration 2008 : 1.5 g
Difference : + 0.14 g
Maximum pedal load 2009 : 38 Kg
Maximum pedal load 2008 : 46 Kg
Difference : - 8 kg


Kurve 3
Initial speed 2009 : 288 Km/h
Initial speed 2008 : 291 Km/h
Difference : - 3 km/h
Final speed 2009 : 115 Km/h
Final speed 2008 : 113 Km/h
Difference : + 2 km/h
Stopping distance 2009 : 105 m
Stopping distance 2008 : 106 m
Difference : - 1 m
Braking time 2009: 2.08 seconds
Braking time 2008: 2.1 seconds
Difference : - 0.02 seconds
Maximum deceleration 2009 : 4.44 g
Maximum deceleration 2008 : 4.6 g
Difference : - 0.16 g
Maximum pedal load 2009 : 115 Kg
Maximum pedal load 2008 : 132 Kg
Difference : - 17 kg


Kurve 4
Initial speed 2009 : 276 Km/h
Initial speed 2008 : 285 Km/h
Difference : - 9 km/h
Final speed 2009 : 204 Km/h
Final speed 2008 : 176 Km/h
Difference : + 28 km/h
Stopping distance 2009 : 49 m
Stopping distance 2008 : 107 m
Difference : - 58 m
Braking time 2009: 0.76 seconds
Braking time 2008 : 1.8 seconds
Difference : - 1.04 seconds
Maximum deceleration 2009 : 4.15 g
Maximum deceleration 2008 : 3.5 g
Difference : + 0.65 g
Maximum pedal load 2009 : 107 Kg
Maximum pedal load 2008 : 105 Kg
Difference : + 2 kg


Kurve 7
Initial speed 2009 : 253 Km/h
Initial speed 2008 : 273 Km/h
Difference : - 20 km/h
Final speed 2009 : 127 Km/h
Final speed 2008 : 123 Km/h
Difference : + 4 km/h
Stopping distance 2009 : 109 m
Stopping distance 2008 : 124 m
Difference : - 15 m
Braking time 2009: 2.16 seconds
Braking time 2008 : 2.5 seconds
Difference : - 0.34 seconds
Maximum deceleration 2009 : 3.49 g
Maximum deceleration 2008 : 3.2 g
Difference : + 0.29 g
Maximum pedal load 2009 : 87 Kg
Maximum pedal load 2008 : 93 Kg
Difference : - 6 kg


Kurve 8
Initial speed 2009 : 298 Km/h
Initial speed 2008 : 304 Km/h
Difference : - 6 km/h
Final speed 2009 : 97 Km/h
Final speed 2008 : 90 Km/h
Difference : + 7 km/h
Stopping distance 2009 : 121 m
Stopping distance 2008 : 131 m
Difference : -10 m
Braking time 2009: 2.53 seconds
Braking time 2008 : 2.8 seconds
Difference : - 0.27 seconds
Maximum deceleration 2009 : 4.70 g
Maximum deceleration 2008 : 4.5 g
Difference : + 0.2 g
Maximum pedal load 2009 : 121 Kg
Maximum pedal load 2008 : 136 Kg
Difference : - 15 kg

[The_Man]

Nice stats!
Where did you get these from?

Very insightful..
Never thought anyone could apply 126kg with their foot onto the pedal!

Awesome,
Thanks Bar555

[bar555]

Nice stats!
Where did you get these from?

Very insightful..
Never thought anyone could apply 126kg with their foot onto the pedal!

Data come from the Brembo site


The function of the brake pedal assembly is to harness and multiply the force exerted by the driver’s foot. It does this thanks to a concept known as "leverage." Increasing the hydraulic ratio (Brake Pedal ratio is the measurement of how much mechanical assistance you are getting from the pedal) would further amplify driver input force . So the Maximum pedal load is the maximum force applied by the driver's foot to slow the car to the desirable speed

graphic


134 Kg for example equals to 13,7 N force

check the links for more details
http://en.wikipedia.org/wiki/Hydraulic_brake
http://www.bmwtips.com/tipsntricks/BrakeInfo/brakes.htm



Glossary
Hydraulic ratio: The ratio of fluid displacement by the master cylinder to fluid displaced in the caliperpistons. Hydraulic ratio is an important factor in the pedal effort equation, the higher the ratio, the lesspedal effort is required (and the longer the pedal travel to achieve a given clamping force). The stiffer the caliper and the stiffer the pad, the higher the hydraulic ratio that can be employed.

[bar555]

FORCE INDIA VJM02 REAR BRAKES - 2009 GP MALAYSIA

[Sinbinner X]

Nice stats!
Where did you get these from?

Very insightful..
Never thought anyone could apply 126kg with their foot onto the pedal!

Awesome,
Thanks Bar555

Don't forget to add the additional 4 to 4.5 G's applied to the pedal while braking.

[The_Man]

Nice stats!
Where did you get these from?

Very insightful..
Never thought anyone could apply 126kg with their foot onto the pedal!

The function of the brake pedal assembly is to harness and multiply the force exerted by the driver’s foot. It does this thanks to a concept known as "leverage." Increasing the hydraulic ratio (Brake Pedal ratio is the measurement of how much mechanical assistance you are getting from the pedal) would further amplify driver input force . So the Maximum pedal load is the maximum force applied by the driver's foot to slow the car to the desirable speed

I appreciate the high school physics lesson, but i really thought the calculations accounted for the pedal ratio. Its really amazing how much force a human foot can exert in impulse. I tried to do a small test and I could do 40kg.

Anyway anyone have any idea how much pedal ratios do Formula one cars run? Because I assume if I can do 40 then a F1 driver can do atleast 50 and then considering the car is stopping at 4Gs then the addisional fores due to that. Doesn't the pedal ratio seem something like 1.5? Quite low I feel.

[bar555]

2011 DATA


Uploaded with ImageShack.us


Sepang circuit main characteristics :
Circuit Length: 5.543 km
Race Distance: 310.408 km
Number of Laps: 56
Brake Wear: Medium
Downforce Level: Medium/High
Tyre Usage: Medium
Tyre Compounds: soft (option) / hard (prime)
Time spent under braking : 13 %
Number of braking zones : 9


2011 – 2010 braking data comparison chart


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Once again it is clear from the chart above that 2011 cars suffer much greater deceleration energy due to KERS and DRS . However in low speed corner 2 , which follows a short stretch , the stopping distance is significantly increased, but the opposite outcome should be expected as both Maximum deceleration and braking time are by great percentage increased ( despite the greater top speed at the end of the stretch ) ! . This observation is unique and to the opposite trend compared to car behavior on the rest corners. A logical explanation is hidden on tyre compound differences between this season Pirelli and last season Bridgetone tyres, showing that Pirelli ones offer less mechanical grip leading to longer stopping distances. Another fact indicating less mechanical grip provided by Pirelli tyres is the lower speed entering a corner after a stretch ( final speed in the chart above ) .



data source : Brembo