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Old 06-06-2007, 09:14 AM   #1
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Default traction(grip) change

1/10 engine car, same date, same circuit..
the traction was changed as times.
i used 37 degree tire.
1. the morning -> good
2. the noon(sunshine) -> understeer, dull
-> most of cars are low in best lap-time.

3. the afternoon -> good

i did test the noon(sunshine) race
car feel rather understeer.. and dull..
But it did not feel like over-grip(high-traction)
But!! when i used 40 degree tire in noon..
the car activity is good!!!

But 40 degree tire is rater dull at the morning and the afternoon..
if i use 37 tire in noon.. what setup must be need to go well?
i did not found any setup(setting) in noon with 37 degree tire.
please advice me.
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Old 06-06-2007, 09:33 AM   #2
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It's not just about how nice the weather is or if the sun is shining...

- What was the temperature of the track during each time of the day?
- Was the track fully dry or slightly damp?
- Did they use any traction compound?
- Did it rain overnight or did it remain dry?
- How was the "groove" on the track? (i.e. quality of driving line surface)
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Old 06-06-2007, 09:59 AM   #3
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Quote:
Originally Posted by rmdhawaii View Post
It's not just about how nice the weather is or if the sun is shining...

- What was the temperature of the track during each time of the day?
- Was the track fully dry or slightly damp?
- Did they use any traction compound?
- Did it rain overnight or did it remain dry?
- How was the "groove" on the track? (i.e. quality of driving line surface)
i quess the traction change factor is temperature

you can the circuit in KEN VS ME battle Movie (KOREA kawahara CUP)

the morning temperature is about 17C

and afternoon (2-3 PM) is about 28C

we did not used traction compound.

"groove" also is good..


when the temperature of the A-main Final (3-4 PM) is high,

most of cars in A-main record best lap was lower than Heat Best-Lap.
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Old 06-06-2007, 10:33 AM   #4
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Surface temperature of the track plays a big role in how the tires perform. Also keep in mind that the tire's performance changes as the tires warm-up from being "cold" when you first put it on the track.

Next time you get a chance, you should try experimenting with different tire shores - 8am, 10am, 12pm, 2pm, 4pm. Take the temperature of the track, run the car with different shore tires and see how each shore performs. This will help you make good tire choices throughout the day as the track conditions change.
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Old 06-06-2007, 10:47 AM   #5
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Quote:
Originally Posted by rmdhawaii View Post
Surface temperature of the track plays a big role in how the tires perform. Also keep in mind that the tire's performance changes as the tires warm-up from being "cold" when you first put it on the track.

Next time you get a chance, you should try experimenting with different tire shores - 8am, 10am, 12pm, 2pm, 4pm. Take the temperature of the track, run the car with different shore tires and see how each shore performs. This will help you make good tire choices throughout the day as the track conditions change.
"Also keep in mind that the tire's performance changes as the tires warm-up from being "cold" when you first put it on the track."

=> you are right!! car go well quickly in first 2-3 lap.. But after 2-3 laps tire temperature is rather high.. car activity was changed.

is different tire shores setup the best solution to overcome temperature change?
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Old 06-06-2007, 11:11 AM   #6
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Quote:
Originally Posted by gansei View Post
is different tire shores setup the best solution to overcome temperature change?
Not always. Depends on how much the temperature has changed and the condition of the track. Sometimes you just need to change the setup a little to account for more or less grip. You need to experiment.

If you have the time, it is also good to watch how other cars are doing in the heats and mains before it is your turn. It can help you determine if traction is up or down compared to previous runs and if everyone is having traction problems or only certain people.
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Old 06-06-2007, 12:42 PM   #7
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tire shore is how hard the tire is,
a soft tire, "lower shore" will tend to flex more (on the contct pach) and this flex will generate heat, but if the track is hot, the tire can pass its "perfect" working temp and it will loss grip.

GANSEI, on hot day you can even put 42 or 45.

Remenber as once I read on a magazine, 75% of the stting of the car is on the tires, they are the one that hace a contact with the track.


Keep testing, this will never end!!!!
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