Innovate Motorsports OT-2 - Manual (Page 19)

Notice that the data appears ‘steppy’ and, based on the timeline, appears to be updating about 6
times per second.
Next we have a log trace of 16 channels (RPM, MAF, MAP, TP, you name it) from a 2006 Saturn:
Even if we zoom in to a closer time scale, the data is quite smooth. Performance is controlled by
two things:
• The Connection Speed
• ECU
Responsiveness
The Lexus in the first example is using ISO 9141 and 10.4K bits per second. The Saturn is using
ISO 15765 (CAN) at 500K bits per second. So it is easy to understand the difference in
performance.
However, the responsiveness of the ECU also can be a significant factor. Consider this log from
a 2006 Pontiac GTO: