data logging question

[BMFB]

I was wondering, and this might be a dumb question...But i Think im recording data at 10 hz, and i was wondering if that was a reasonable asumption. On my setup table when i connect i get 10hz, and i guess my question would be is that what it logs at.

The reason i ask is because if that was true, i could look at my data, and figure out my 0 to 6 times, and have a decent guess at my 1/4 mile times. If it does record at 10hz, that would mean every 10 rows would represent one second of passed time, and i was looking at it, and if that was true then my 0-60 times are about 4.3 and at 12.5 seconds im going 95mph (im sure thats not my 1/4 times... no way...) it feels fast, like, really fast. A boost launch chirps all 4 tires hard for a split second then just picks the front end up and hauls. It made my friend in the car sick, so i thought that was a good sign. im running at about 16-18 PSI.

does this idea make any sense to anyone else?

 

[WyoSyclone]

Re: data logging question

I was wondering, and this might be a dumb question...But i Think im recording data at 10 hz, and i was wondering if that was a reasonable asumption. On my setup table when i connect i get 10hz, and i guess my question would be is that what it logs at.

The reason i ask is because if that was true, i could look at my data, and figure out my 0 to 6 times, and have a decent guess at my 1/4 mile times. If it does record at 10hz, that would mean every 10 rows would represent one second of passed time, and i was looking at it, and if that was true then my 0-60 times are about 4.3 and at 12.5 seconds im going 95mph (im sure thats not my 1/4 times... no way...) it feels fast, like, really fast. A boost launch chirps all 4 tires hard for a split second then just picks the front end up and hauls. It made my friend in the car sick, so i thought that was a good sign. im running at about 16-18 PSI.

does this idea make any sense to anyone else?

Makes sense to me.... things are recorded in millisecond intervals.

 

[turbodig]

Re: data logging question

Normal sample rate is between 9-11 hz, depending on the scan tool and cable used.

I wouldn't consider using a frame count as a reliable method to do timing.
Most scan tool software has a built-in timer that is relatively accurate, however, you don't know if the data changed between samples, or right at the time of the sample.

Find a copy of homedyno or streetdyno, it'll be a better representation of whether you're improving things on a tune or not. (provided you use a consistently flat road, and do passes in both directions to cancel out wind effects)