i put a start/finish line in on a little loop i drove. rc gave me some laptimes. upon export however the lap data all appeared to be n/a.
this is not that dump, but a previous dump: http://mike.developer10.com/test.csv
here is a vid i made: http://www.youtube.com/watch?v=tvhRs_2cwCI&fmt=35
why is the lateral g's graph pegged to the right? was my data bad? or did i just source that data wrong from the file?
i thought i added some things to pick up on the obd2 data that didn't get exported. like throttle was one and throttle % was another - i see the % here but the other is not? also what does the primary/secondary mean for the obd2 config?
Not sure about the lateral g's though. RaceChrono calculates them from GPS data so they should be in center in average.
Only RPM and Throttle% are currently exported in CSV, but I could add some other important ones as well (but not all), if you have a list? High priority channels mean they are requested as often as possible. Low priority mean they are requested ten times less often than the high priority. Notice that this bandwidth is shared with all channels, so adding more channels will make the resolution worse.
BTW: Is ChaseCam working on RaceChrono support? If so it might be useful have them contact me, and we could work out what ever format we like, xml, binary... Also could have all OBD-II info (CSV is a bit inconvenient for that).
It would be awesome to have the 2 work together flawlessly
what about speed? i thought i read somewhere (here?) that obd2 speed would be more accurate than gps speed.
Actually the OBD2 speed is not as accurate, but is more consistent. Meaning there is a fixed error in OBD-II speed (usually readings are a bit too high), but no GPS style random errors. For video use GPS is more than enough (rather save the bandwidth for other channels to improve resolution).
The boost reading is measured in kPa units (this is how OBD-II reports it), and 100 kPa is 1 bar. I probably should change the units to bars and PSI at some point.
You are getting values between 20-90 kPa, which is 0.2 bar - 0.9 bar. So the reading is relative to the air pressure. But I wonder if it's right, because I'd think you'd get negative pressure when lifting. The values correlate nicely with the throttle usage, so it is the right channel.
You had recorded 4 channels as primary, which is in my opinion too much, as you seem to get only 4 channels per second (on some cars the number is closer to 10, but usually 3-4). So the resolution of each channel is more than one second.
Can you do me a run with only two channels logged, throttle and boost?
Thank you for the data, I will use it when I add the boost to the CSV!
i believe the 05 sti does 14.5 psi stock max, i have a cobb ap stage 1 which i think raises it to 16 psi. i don't recall how i was driving, so i'll include that on the next log i make.
it makes sense only to log throttle, rpm and boost as that is all that will be exported anyway correct? throttle rpm as primary boost as secondary? how about that? will make you a new log this weekend.
The channels you log is of course compromise between update rate and different channels... your call :-) I would pick RPM and Throttle OR Boost for my videos. This way they both would be updated twice per second.
RPM, Boost, Throttle and Speed should all be high priority channels, as these are update rate sensitive channels (lot of info that changes quickly). For stuff like temperatures etc, low priority is fine.
Notice that you can not use Boost on a video before I make some changes (also for RaceChrono2AVI some changes are needed).