AC Friendly Event: Audi Sport TT Cup @ Highlands - Wednesday 21st June 2017

[pr0xx]

Hello,

Please sign me IN .

 

[Rupe Wilson]

IN

Hey pls sign me in ;

Hello,

Please sign me IN .

signing you in now guys

 

[W.Fox]

Im in aswell!

 

[k_badam]

oops lol

 

[Eddy]

Sign me in reserves, these cars are too good to pass (no pun intended ), maybe a spot will become free

 

[Rupe Wilson]

Im in aswell!

Sign me in reserves, these cars are too good to pass (no pun intended ), maybe a spot will become free

Adding you to the list guys

 

[Rupe Wilson]

@Paul Jeffrey
Are you racing tomorrow night

 

[Paul Jeffrey]

@Paul Jeffrey
Are you racing tomorrow night

Hey Rupe,

Sadly not fella. I'm tasty to things that fly and bite so currently both my feet look like the elephant man!! Not necessarily forcing me out of the seat, but best to try and keep it calm as I'm doing a kart race on Sunday and currently defending my championship lead

 

[Rupe Wilson]

Sorry to hear you been eaten alive not nice..
ill give take your seat to a reserve driver then. Take it easy and see you soon back at the helm.

 

[Rupe Wilson]

@Eddy_J1
you have now been promoted to server 1 and are racing

 

[Ryan van Wyk]

Im struggling with some network issues will confirm later if i will need to remove myself.

 

[Gasper Grebenc]

Put me on reserves list if someone wont be abler to make it

 

[Flecky_und_Sky]

rupe, i comes little bit later at 19.20GMT.... ok thx....

 

[Lars Rystedt]

A question about the tyres, should I go for even out the psi or temperature? As it is now if having 28psi all around (when warmed up) my left front is at between 91-93 at all times, my rear right is below 80 and the other two in between 80-85.
Or should I fiddle with pressure to get a more even temp all around?

 

[RasmusP]

A question about the tyres, should I go for even out the psi or temperature? As it is now if having 28psi all around (when warmed up) my left front is at between 91-93 at all times, my rear right is below 80 and the other two in between 80-85.
Or should I fiddle with pressure to get a more even temp all around?

Hey man,
this question bothered me too and I decided to do a quick math about it.
What is that:
I looked into the ini-files from the Diablo SE30 mod and searched for numbers...
I found default data for:
1. "tcurve" = table for Griplevel and Temperature: 65-85°C = 100% Grip!:
[°C | %]
0 |0.80
20 |0.92
40 |0.95
50 |0.98
65 |1.0
80 |1.0
85 |1.0
105|0.97
140|0.95
160|0.88
200|0.82
220|0.80
250|0.60
Graph:


2. Default data for "Rolling Resistance" = "12" and for "Pressure_RR_Gain" = "0.55":
So 12 is 100% at optimal pressure, 100% = 12+0.55*0 psi ; 102% = 12+0.55*(-1 psi) and so on:
[psi change | RR in %]
-5 | 1.23
-4 | 1.18
-3 | 1,14
-2 | 1,09
-1 | 1,05
0 | 1,00
+1| 0,95
+2| 0,91
+3| 0,86
+4| 0,82
+5| 0,77
Graph:



3. "Footprint loss per PSI" = "0.00045" and now I have a problem... What is the footprint?!
Well I will go with just the "Tire Width" = "0.245" and take that as footprint... Also I take footprint as grip. So 100% footprint = 100% grip!:
[psi change | footprint in %]
-5|1.09
-4|1.07
-3|1.06
-2|1.04
-1|1.02
0 |1.00
+1|0.08
+2|0.96
+3|0.94
+4|0.93
+5|0.91
Graph:


So after doing that: what is the conclusion?!
Let's say you need -4 psi to get the tire warmer and in the "perfect temp area".
So your tire is 50°C but would need 65°-85°C to be at 100%. It's already at 98% grip!
-4 psi would do that:
1. increase the rolling resistance by 18% which will definitely decrease your top speed!
2. increase your footprint by 7%. (if the footprint isn't just the tire width but "tire width * 2-3mm" that would only be ~3%!)

If my math is "correct" you will gain 2% grip, have almost 1/5 more resistance and I don't know about the footprint-impact .

- Conclusion:
1. Cold tires are a problem!
2. "Almost warm" tires doesn't have such an impact as you might think!
3. Too hot tires are worse than not completely warm tires!
4. The grip won't be influenced much by the PS! (footprint-impact?!)
5. But the Rolling Resistance will be influenced heavily!

6. You trade top speed for grip but loose more top speed than you gain grip!

After doing that I will go for slightly colder tires and optimal pressure all the way! And keep the "pressure priority" to optimal and higher, not optimal and lower!

PLEASE tell me if that is correct, should I create another thread for this? Oh man... Why did I do that?!

@Lars Rystedt edited my post

 

[Lars Rystedt]

This is a good way to give me a headache!

 

[Joe Cannarozzo]

Hi
Sign me up please on reserve list please

 

[Nickl561]

Semis I'm finishing work earlier than expected so can you put me on reserve list please

 

[nockel]

out for today. something going to hot on hardware

 

[Rupe Wilson]

Put me on reserves list if someone wont be abler to make it

Hi
Sign me up please on reserve list please

Semis I'm finishing work earlier than expected so can you put me on reserve list please

Adding you now guys.

out for today. something going to hot on hardware

ok thanks for letting us know