Useful datazap (acceleration) comparisons

[threetirtyfive]

Is it possible to overlay two logs in datazap?

Reason I ask is I think we can make much better usage of the logging available in MHD and datazap, when you make a modification / MAP change to your car and you accelerate on the same stretch of track, performing logging, which records speed and time, you can quickly see the 0-60 0-100mph etc. If we could overlay two logs (say the speed side by side (or even revs) we could quickly see if one particular tune contributes to greater acceleration than another.
The starting point in both logs would need to be identical, so it could be done by starting a log say from WOT at 2K RPM in 1st gear and aligning both logs to this.

[threetirtyfive]

As an example, with a lot of manual work, comparing logs from when I was at the drag strip to the recent runs done with stage 2+, I can see I'm acceleration significantly quicker:
drag strip log (in datazap)
1251.76 (start time of clutch dump)
1263.07 (end time at 6300rpm)

11.31 seconds




stage 2+ inc FMIC

433.69 (starting time of clutch dump)
443.85 (end time at 6300 revs in 3rd gear)

10.16
Which shows AT LEAST 1.15 seconds quicker in current tune (logged up hill) compared to the 13.5 second quarter mile achieved at the drag strip.

If there was an easier way to overlay both logs, it would be possible to see performance increases from different tuning.
I don't want to mess around with making a custom CSV to import to datazap. Is there another way??

[RSL]

+10000. I wish more would push for this. I've been asking for an overlay/comparison feature almost since it came online. Even if the overlay never happens, it wouldn't be difficult to add calculated time between fixed or user-input start/end points for RPMs, speeds, etc. on the current layout.

[all4bspinnin]

+10000. I wish more would push for this. I've been asking for an overlay/comparison feature almost since it came online. Even if the overlay never happens, it wouldn't be difficult to add calculated time between fixed or user-input start/end points for RPMs, speeds, etc. on the current layout.

Definitely agree 100%!!

[threetirtyfive]

I've put together my own CSV file to compare Stage 1 to Stage 2, with boost, acceleration, shift points
http://datazap.me/u/threetirtyfive/s...-17&zoom=0-157

Either datazap should offer this feature automatically, or someone here could write a macro to automatically do this with 2 CSV files. See the log above, this was synchronised on the gear and RPM for two different tunes.
Purple shows the stage 2 boost vs green stage 1 boost (both actual boost) as you can see by the grey lines, they were properly synchronised on the RPM.
As the stage 2 tune allowed a faster acceleration, the shift points were earlier. So note that the RPM climbs faster for stage 2, the logs are still properly synchronised together (on TIME) but stage 2 has much greater acceleration.

By doing this I can compare acceleration, boost, fuel pressures etc.

If we had an easy way to do this, we could see when we'd need to upgrade and what the restricitons are- eg. intercooler overheating with a specific tune, fuel pump pressure dropping too low.

We could also see how well one tune works against another. This simple example i've uploaded shows the potential of combining data logs.

Also look at the IATs, this shows a direct change in intake temperature since changing from OEM to the (chinese) Wagner 7.5".
IATs for the standard intercooler started at a higher point as there was more heat soak whilst queuing waiting for my turn at the quarter mile, where as the stage 2 [2] iat log is less heat soaked.
Ambient temps for both logs were within 5c.

We can also see that the WGDC is at a higher % for the stage 2, as expected, as the turbos are having to maintain more boost. Stage 2 also starts initially at a higher WGDC % as it's more of an aggressive tune, to spool the turbos up faster.