|
Julian Data >>
What I am trying to do is fix the ailments you are having, and at the same time thinking of ways to make the car/tires last longer during the fuel run since this is a race setup.
Here's my response to the 3rd test...
OK, so we have added some time back to the laps. Is this bad or good? From a laptime standpoint, that's a big fat NEGATIVE! But what's a good thing about the last adjustments? Did you notice anything? ...Look at the wear... we have now decreased the wear in HALF!
So what's the next step? Well, we need to get those laptimes back down and fix the problems with the setup. From the results, we can conclude the following:
- First 1/3 of the run the car is tight.
- Second 1/3 of the run, the car is becoming more "driveable/stable", yet I assume more like "neutral tight".
- Last 1/3 of the run, the tires seem to be getting worn and the chassis has really changed.
What I see:
The left side of the car isn't getting any heat in the tires as in the earlier runs. We lost 20° or so on the left sides. The right side tire temperatures show the RF still doing a lot of work and the RR not doing much, which shows that the setup is biased to the RF.
Remember, I would like to see the tire temps balance out. Overall, the tire temps have dropped thus giving us great wear!
Here it goes for the next round of adjustments:
- To bring up more heat evenly to the tires, let's increase the ARB. For the front, add one bar. If we just leave this setting like it is then the car will certainly be tight in the middle and thus overwork the front tires. So to prevent that, we need to increase the RARB by two, which will loosen up the car in the middle.Note: ARB's are for the MIDDLE of the turns.
- Entry of Turn 1: Drop the RF spring by 50 lbs for a start. Leave all other springs alone. Drop RF bump by 50.
- At the last third of the run, you mentioned that the car wanted to go around, so we need to play with the left side of the car. Decrease LR bump by 50. This should cure some of it. If not, there's more adjustments to be made.
Timothy Bennett >>
I bumped the Front Sway Bar by one bar, and I bumped the Rear Sway Bar by two. Additionally, I dropped the RF spring 50 lbs. Finally, I dropped the RF and LR shock bump each by 50. I then ran a 70 lap run. Here's the results.
Lap Times (sec)
Best Worst Average Std Dev Variance
start (laps 1-23) 23.716 24.775 24.062 0.209 0.044
middle (laps 24-46) 23.731 24.593 24.102 0.174 0.030
end (laps 46-69) 24.114 25.001 24.393 0.178 0.032
total (laps 1-69) 24.186 0.236 0.056
1/4 Run @ Lap 18 - Wow! The setup during this first part of the run was almost perfect! Not loose or tight in any part of the corners. The loose condition under braking is gone! I could put the car on the bottom of the track through the corner, and it didn't want to push or break loose exiting the corners. I turned two personal best laps during this part of the run!
1/2 Run @ Lap 36 - No major changes in the way the setup felt during this part of the run still great! It might be wanting to pick up a push through the middle of the turn, particularly after the RF turned yellow on lap 29. Most likely it was the driver over-driving into the corner. As far as I am concerned, any lap >24 seconds was because the driver missed his marks. The car felt like it was capable of consistently running sub 24 second laps.
End of Run @ Lap 69 - Setup tightened up a little during the last half of the run as the tires began to wear. After all four corners were yellow on the wear indicator, I noticed about 2/10 second per lap being scrubbed off. When the RF went orange on lap59, it was more difficult to turn consist lap times. I could feel the front sliding through the turns, and I had to make an adjustment in my driving style.
Tire Wear
Lap Wear Indicator Color
21 RF turns light green
25 RR turns light green
28 LF/LR turns light green
29 RF turns yellow
38 RR turns yellow
42 LF/LR turns yellow
59 RF turns orange
Tire Temperatures (°F)
LF RF
Lap O M I I M O
18 193 188 184 224 209 212
36 190 185 181 222 208 210
69 177 172 169 209 198 198
LR RR
Lap O M I I M O
18 195 189 182 200 185 186
36 194 187 181 197 183 183
69 186 180 174 190 178 178
Note: All tire temperature readings were taken at about the 1/3 distance mark of the backstretch.
My comments: My first observation is that this setup feels really good! Wow! Not loose or tight anywhere in the corners. Only after about 50 laps does the car began to noticeably push. The loose condition under braking that has plagued me is practically gone! Tire wear is excellent. Lap times were definitely the best so far, including three personal best laps in the 23.7's!! Generally, lap times improved from 24.541 ± 0.725 to 24.186 ± 0.236 - an improvement of - 1/2 second per lap!
Tire temperatures increased, particularly on the left side. However, tire wear didn't increase. That's got be good! Are the temperatues even enough around the corners? There was a general cooling of the tires during the last 1/2 of the run. Why is that? Seems like the tires would just continue to get hotter?
Y]Julian Data >>
Are we happy yet?
A couple of observations about your run:
- The tires are now starting to wear uniformly due to the force applied to them thus showing us that all tires now showing signs that all is starting to come together! ; )
- The tire temperatures are also starting to show the force applied on each tire as each tire works better giving you traction through the corners. I am happy that the left side tire temperatures are now starting to balance out the car. See it? : )
- As the fuel load lightens, there is a push going into the corners.
- CONGRATS on your Personal BLAPs! I think I can drop you down some more for the longer run, so hang in there! We are heading into the right direction since these last adjustments helped out a great deal as the car isn't falling off as much now.
TB Tire temperatures increased, particularly on the left side. However, tire wear didn't increase.
JD Amazing isn't it? : ) Traditionally, the right side tires take the most beating due to the bias of the chassis/suspension and the layout of an oval track, which promotes more wear and heat. Yet, the left sides usually wear very slow. If you balance the car properly - meaning, get all the tires working in unison - you will be able to not only run faster times but also for the long run! Think consistancy here.
TB That's got be good!
JD Yes, it usually is. So this is good!
TB Are the temperatues even enough around the corners?
JD The overall tire temperatures on all four tires is almost there to my liking. I still want to all four tires at the 200-205º (even 210º) range in which it seems to be the sweet spot at this track though it could be higher though could cause a great deal of tire wear rapidly thus giving you a short fast run per se.
TB There was a general cooling of the tires during the last 1/2 of the run. Why is that? Seems like the tires would just continue to get hotter?
JD This is usually the result when you have a soft suspension; you see as the fuel load lightens and the tires wear, they tend to not work as hard. We'll work on this to get more force onto those tires to keep them heated as this is work in progress.
Adjustments:
Since the first 50 laps were a success, I would like to work on the car at the last half stage of the full run. Now, think for a moment, since I am going to at this later stage, the setup could change a bit during those first 50 laps. Keep that in mind.
So I am going to work on the middle and the entry of the corners. I usually brake the corners up into three sections: entry, middle/apex and exit. My first emphasis has always been the middle of a corner as I want the car to turn in the middle and then followed by entry and lastly, exit.
- Increase the FARB by one. Why? I want the car to have more forwad bite in the middle of the corner.
- Increase the RARB by three. Why? To balance out the adjustment made to the FARB and to make it looser in the middle.
- To continue, fixing the middle of the corner, take out 4lbs of wedge.
During this run, I am looking for the characteristics of the tire temps and how the car reacts during the run at the first quarter and last half. I am hoping to free up the car. I know that this will not be the last set of adjustments as I feel that the car will still be tight again at the later stages but should take longer to get to this condition. I just want to see where's this adjustment is going to direct me.
BTW, are you hitting redline or does the over rev light come on?
  
|
ABOUT US | CONTACT | ADVERTISING | LINK US | RSS
Blackhole Motorsports Copyright © 2005. Hosted by Isolcom Interactive Ltd.
