Fourth color on lateral acceleration maps

toolo4sno · Post by **toolo4sno** » Wed Aug 20, 2014 4:27 am

Perhaps this is a GP feature, not sure.

I'd like another color and range of values added to the lateral acceleration maps. It can be either above red or below green. I just want to see those moments where I hit a peak lateral G load. Keeping the highest group red would be good given the stark contrast between red and yellow. Not sure on the color that could be used below green; blue maybe grey.

The attached photo is an older HLT version screen grab of the map, but shows the map in question.

Sort of related, but off topic. What is the maximum acceleration values that an iPad or other Apple device can measure? Is it 1.4g as the slide selector suggests?

Post by **Harry** » Wed Aug 20, 2014 7:09 am

Seems it is +-2G max with a finest resolution of 0.018G. You can set up to 2.0G as color threshold in LapTimer's Expert Settings.

Harry

toolo4sno · Post by **toolo4sno** » Wed Aug 20, 2014 12:13 pm

Harry wrote:Seems it is +-2G max with a finest resolution of 0.018G. You can set up to 2.0G as color threshold in LapTimer's Expert Settings.

Harry

Ok, I see that in the settings. Now we just need one more color (and range of values).

Post by **Harry** » Wed Aug 20, 2014 1:33 pm

Not sure why a 4th range is necessary? The idea behind the three colors is having the yellow / red threshold set to the car's limit (or maybe 0.1G below). The green / yellow threshold is the value you should be beyond when passing a corner optimal. All of this does certainly not include higher or lower limits from inclination of street and different grip levels - but that's a different dimension anyway.

Threshold are in general not a good approach to catch peaks - you will always need more. To analyze peaks, I'd suggest to use the Charts for lateral or overall acceleration.

- Harry

toolo4sno · Post by **toolo4sno** » Wed Aug 20, 2014 1:49 pm

It is definitely not necessary, but more information is generally better. I believe right not I am using the default settings of green up to 0.8g, yellow 0.8-1.0g and red +1.0g. If I had another color I could see those short moments where I may have pulled 1.25g or so. I'd probably set it to 1.2g and up.

When I set the thresholds as you describe (red at vehicle limit) the map is pretty much all green and yellow. I guess I am mostly looking for further definition.

Post by **Harry** » Wed Aug 20, 2014 2:10 pm

Yes, that's the reason I set the red threshold to slightly below limit. With the definition given, the goal is to be green on straights, yellow in corners, and rarely red. This is not the most colorful display, but the one you are fastest

- Harry

gplracerx · Post by **gplracerx** » Wed Aug 20, 2014 4:32 pm

Harry wrote:Yes, that's the reason I set the red threshold to slightly below limit. With the definition given, the goal is to be green on straights, yellow in corners, and rarely red. This is not the most colorful display, but the one you are fastest

- Harry

That's good for track days in your personal car. For competition, though, you want to be red most of the time in the corner. In fact, if you see a small slice of yellow, it's probably because you went slightly too fast and went beyond the peak in the slip angle vs lateral g curve. A lot depends on how forgiving your tires are, i.e., how fast the grip falls off with increasing slip angle beyond the peak.

toolo4sno · Post by **toolo4sno** » Wed Aug 20, 2014 11:34 pm

gplracerx wrote:
Harry wrote:Yes, that's the reason I set the red threshold to slightly below limit. With the definition given, the goal is to be green on straights, yellow in corners, and rarely red. This is not the most colorful display, but the one you are fastest

- Harry
That's good for track days in your personal car. For competition, though, you want to be red most of the time in the corner. In fact, if you see a small slice of yellow, it's probably because you went slightly too fast and went beyond the peak in the slip angle vs lateral g curve. A lot depends on how forgiving your tires are, i.e., how fast the grip falls off with increasing slip angle beyond the peak.

Different ways of looking at it I guess. I agree with gplracerx though; I want to see a bunch of red in most corners. I can try to look at my good sector times from on my best virtual lap, then check out the g maps for those. With one more threshold level on the map I can see more detail. Like did a peak occur before or after the apex, or just where I can push in general. I'm a relative novice though; so perhaps effort is better spent elsewhere.

Interesting thought on seeing yellow in a sea of red though. I had wondered why that would be. I do vaguely remember a little slip for those. (map attached)

I have HLT on iPad; so the display for all functions is quite huge. I can easily deal with more graphics.