VCM Scanner - whats each cycle represent

[Elmis]

I know I've read posts about this - but I couldn't find them when I looked just then.

When looking at logged data in VCM Scanner, what does each frame / cycle represent? 100ms?

[Keith@HPTuners]

On vehicles that support the faster scanning method (most of the vehicles we support), it scans at 10 frames per second, which would be 100ms per frame.

On some models that do not support the faster scanning method, it should scan at approx 5 frames per second.

[Elmis]

Thanks.

That gives me an idea...

Are the 10 frames per second half way accurate? You wouldn't happen to know if the Odometer PID (which doesn't currently appear available in VCM Scanner) includes meters travelled?



I know.. I shouldn't thinking about such things.
...

Having fun logging and learning. While looking for some 0-100km/h times I noticed a jump from 66km/h to 94km/h in 0.1 seconds. Looked at for a moment.. then noticed 95% throttle, and the fact the 1st to 2nd shift occurred at that exact time.

The Transmission Shift Mode at that point went from 7 (which I've guessed is Power Mode (Performance)) to 8. It stayed at 8 for 1.0 seconds, which seemed to coincide with regaining full traction at around 90km/h.

Any chance a shift mode of 8 indicates loss of traction? Nothing else - 100% throttle, reported Torque and trans temps etc, appeared to match it particularly well.

[Keith@HPTuners]

I don't have the answer regarding the shift mode, but to make things easier to scale vs time, in the future we will be timestamping the chart display and the logs as well.

I don't know why we didn't add the timestamp in there before.

[Chris@HPTuners]

Trans shift mode works like this:

0:
1:
2: Hot Shift WOT
3: Hot Shift MPH vs TPS
4: Normal Shift WOT
5: Cruise Shift MPH vs TPS
6: Normal Shift MPH vs TPS
7: Perf Shift MPH vs TPS
8: Perf Shift WOT
9:
10:

[Elmis]

Thanks - the shift mode list removes one more (incorrect) guess from the equation.

While my google searches are turning up lots of lists regards all the PID's available, nothing seems to actually explain them individually.

[Chris@HPTuners]

we are working to document all this as part of the help files at the moment.

[jimmyblue]

What kind of car is this? I am interested in how it
accesses "Performance Mode". Never have found a
way to toggle between them (I think my F-body is
always using "Normal" mode). But I will have to check
out that mode param and see what table it's pointing
at....

[Elmis]

The car is a 99 VTII Holden Commodore.

See the pic below off my website...



On the left side of the gear lever is a button to turn traction control on/off, on the right is a power mode button, to change the trans from normal to power mode.