AiM Steering Angle Question
#1
Three Wheelin'
Thread Starter
AiM Steering Angle Question
I made a few suspension tweaks last season to reduce under steer on my GT4. My butt dyno said they work but thought I'd look at some data. Steering angle info is coming from the ECU to my Solo DL. The data is supposed to be in degrees but I'm getting readings of -801 to +844. Are these really .01 degree? On my measures plot, the range was preset to - 500 to +500, I changed that to 1000 and the graph looks O.K. I'm thinking that overlaying two laps (before and after suspension mods) will give me what I'm looking for?
#2
Rennlist Hoonigan
which cost no drachmas
Lifetime Rennlist
Member
Rennlist
Site Sponsor
which cost no drachmas
Lifetime Rennlist
Member
Rennlist
Site Sponsor
I made a few suspension tweaks last season to reduce under steer on my GT4. My butt dyno said they work but thought I'd look at some data. Steering angle info is coming from the ECU to my Solo DL. The data is supposed to be in degrees but I'm getting readings of -801 to +844. Are these really .01 degree? On my measures plot, the range was preset to - 500 to +500, I changed that to 1000 and the graph looks O.K. I'm thinking that overlaying two laps (before and after suspension mods) will give me what I'm looking for?
#3
Rennlist
Basic Site Sponsor
Basic Site Sponsor
Join Date: Jun 2008
Location: Durham, NC and Virginia International Raceway
Posts: 18,677
Received 2,833 Likes
on
1,670 Posts
Bill, you want to look at trends, not just the physical motion on two laps. Matt’s visualization (easy to do) works really well to “see” the amplitude of understeer (or not).
For many drivers, steering (and the perceived amount required, versus the result) is often as difficult to quantify consistently as braking.
I would also look at average steering angle (a new AiM feature) within a predefined sector, validate with a strip chart showing expected versus actual steering angle and, of course, the sector times themselves.
Look at a broad swath of quick laps, before and after, to avoid making decisions based on outliers.
For many drivers, steering (and the perceived amount required, versus the result) is often as difficult to quantify consistently as braking.
I would also look at average steering angle (a new AiM feature) within a predefined sector, validate with a strip chart showing expected versus actual steering angle and, of course, the sector times themselves.
Look at a broad swath of quick laps, before and after, to avoid making decisions based on outliers.
__________________
-Peter Krause
www.peterkrause.net
www.gofasternow.com
"Combining the Art and Science of Driving Fast!"
Specializing in Professional, Private Driver Performance Evaluation and Optimization
Consultation Available Remotely and at VIRginia International Raceway
-Peter Krause
www.peterkrause.net
www.gofasternow.com
"Combining the Art and Science of Driving Fast!"
Specializing in Professional, Private Driver Performance Evaluation and Optimization
Consultation Available Remotely and at VIRginia International Raceway
#4
Three Wheelin'
Thread Starter
Here's a screenshot from a lap @ WGI. I believe that I'm seeing the "vertical tails" on the right side and looking at the data, this looks like Turn 1 in the worst case. Is there a way to tell my position on the lap?
#5
Rennlist Hoonigan
which cost no drachmas
Lifetime Rennlist
Member
Rennlist
Site Sponsor
which cost no drachmas
Lifetime Rennlist
Member
Rennlist
Site Sponsor
It looks like you might have an extra channel selected. The graph should look something like these. The first is a pretty neutral car and the next is one that has some more understeer. I can look and find a really bad one later if you want to see it.
This is minimal understeer. The top right portion of the graph shows some more than the lower left.
This is minimal understeer
This is a number of laps showing the understeer in the vertical portions of the graph.
This is minimal understeer. The top right portion of the graph shows some more than the lower left.
This is minimal understeer
This is a number of laps showing the understeer in the vertical portions of the graph.
#6
Rennlist
Basic Site Sponsor
Basic Site Sponsor
Join Date: Jun 2008
Location: Durham, NC and Virginia International Raceway
Posts: 18,677
Received 2,833 Likes
on
1,670 Posts
What's interesting is that Matt's first two examples show more understeer going one direction than the other!
Agreed, Bill. Have one too many channels selected.
Agreed, Bill. Have one too many channels selected.