Great job Phil! scatter plots rule!

[savagerocco]

Phil,

I just wanted to say "Great job" on the scatter plots. I have been playing with them and it makes it so much easier to see what is going on. I have been having issues with knock and looking at per cylinder knock has allowed me to notice some issues that I have been trying to chase down for a while. Thanks for all your work!

[djp0623]

Would you mind sharing the data that you found useful to plot? I.e. what you had on each axis?

Thanks

[savagerocco]

You have two plots with 3 dimensions. The x y and z data sets are selectable. I was looking at knock per cylinder with map and afr shown. I can look at the amount and intensity of knock on each cylinder and compare two at a time. It is easy to see trends and bigger patterns with the plots.

Here is a screen shot of that data

[whittlebeast]

Scatter plot is one of the most powerful features in all of EFI tuning. I have been using them almost exclusively for about two years now.

The trick is do fairly huge data logs with about 300,000 records. I normally start with with the X and Y axis the same as the X and Y axis of the table in TS that you are working with on your tune, The Z axis is normally the thing you are trying to adjust and you are looking for patterns in the colors as the result from the table. The most common combinations are

To tune a VE table

X=MAP
Y=RPM
Z=AFR

or to tune a spark table

X=MAP
Y=RPM
Z=Knock

I also like to add filters to create all sorts of cool plots

Now try creating a few fields

RPMfiltered = [Engine]=1?[RPM]:0

MAPFiltered = [Engine]=1?[MAP]:0

PWfiltered = [Engine]=1?[PW]:0

then plot

X=MAP
Y=PWfiltered
Z=RPM

All sorts of surprising patterns start showing up when you play with filters.

Have fun tuning.

Andy

[robd]

Has anyone got anymore info on using Scatter Plots that would be helpful? I'd really like to start using them but I'm still unsure of what I'm doing, although the above has now given me a better idea of what's what!

Thanks

[whittlebeast]

See http://www.msextra.com/forums/viewtopic ... 00&t=47234

The best thing to do is ask what you are trying to see and I will help you with how to see what you are looking for

This happens to be a fairly typical plot off our turbo rotary Miata running an autocross.



Andy

[pit_celica]

When I'm fine tuning the VE table, instead of using VEAL, I'm plotting RPM in X, MAP in Y and Gego in Z. Then, dark blue are areas on the VE table that are too rich and red are areas where it's too lean. You need to have closed-loop EGO working to do this.

For tuning the idle initial duty, I'm using RPM in X, MAT (or CLT) in Y and idle_duty in Z. Use this scatter plot on a cold startup and warmup log.

There are a lot of other possibilities, but these are the ones I'm using the most.

Sam

[robd]

Thanks for the replies, I suppose to begin with I knew nothing about scatter plots other than I'd heard a lot of people talking about them, so just wanted to know how to make use of them. I did a scatter plot the other day of my TPS% values vs RPM in Excel to get a better idea of my actual ITB Load Switchpoints and that made a massive difference.

So I guess the next thing would be to find areas where I think I'm too rich just after/around my switchpoints from SD to AN where I'm hitting about 13.6AFR or so at about 15-25% TPS or there abouts.

I guess that would be RPM vs Load vs AFR?

[Fabius72]

Phil,
about scatter plots, some time ago I found a sort of manual you wrote, showing some graph with different X-Y-Z fields and explaining how they can be useful in our tuning.
I thought it was on the MLV "help" page, but I can't find it there.
Please, may you post here or may you tell us where you put that page? I would like to take advantage by this fantastic tool!!
Thank you very much.

Fabio

[LT401Vette]

You may have come across the "Tuning With Scatterplots" Presentation from the 2013 MegaMeet at DIY AutoTune.

http://www.tunerstudio.com/downloads2/2 ... rPlots.pdf

[elaw]

There's a very good page that Andy (whittlebeast) wrote here: http://www.ncs-stl.com/tuning/

Is that what you were thinking of?

[Fabius72]

You may have come across the "Tuning With Scatterplots" Presentation from the 2013 MegaMeet at DIY AutoTune.

http://www.tunerstudio.com/downloads2/2 ... rPlots.pdf

Yess Phil, exactly that one!! Thank you!!

There's a very good page that Andy (whittlebeast) wrote here: http://www.ncs-stl.com/tuning/

Is that what you were thinking of?

Eric,
great page! Thank you! But no, it isn't, I meant a Phil's (and Andy) document.

Now I have a lot to study

Fabio

[john.p.clegg]

Ditto

Thanks guys,was just about to ask the same question...they sure look pretty but without the info behind them...

Going to read..

John

[john.p.clegg]

Talking of which,any ideas why I've got horizontal bars instead of a swarm/cloud?
Something to do with logging the TPADC?

scatter plot.JPG

Thanks
John

P.S think my throttle plates need a balance at TPADC 26 ?

[LT401Vette]

If you are plotting an integer field where it is logged as whole numbers only (such as any ADC will be), you will get those bars instead of a cloud.

[john.p.clegg]

Give me time to log off mate....

Excellent

Thank You

John

[linzerl]

I'm teaching myself filters in the scatter plots..and have a syntax question.

In the above post in RPMfilter..what does [RPM]:0 mean?

Many thanks. .

[Fabius72]

It's an "programming rule" (I don't know how to tell in English, sorry)

RPMfiltered = [Engine]=1?[RPM]:0

Literally, RPMfiltered value depends of [Engine] value.
This is the check: if ([Engine]=1) is true, then RPMfiltered = [RPM] value, else RPMfiltered = 0.

Cheers,
Fabio

[LT401Vette]

Inline if statement, you can do a lot with them.

testCondition ? trueExpression : falseExpression

Each component can be simple references to a field or value, or it can be an expression.

testCondition is considered true if it resolve to a non-zero value, false if it is 0.


In the above example:
RPMfiltered = [Engine]=1?[RPM]:0
It works like Fabio outlined with the key point being that if [Engine] == 0, it sends the value to 0, so all values where Engine is not 0, will hit that spot and not show up on the scatter plot.

A couple notes though:
The correct syntax would be:
[Engine]==1?[RPM]:0
There should be 2 = signs in a comparison operation.
Then any time any other Engine bits other than Run are set, the value would be set to 0. This turns the value of RPMfiltered to 0 unless only the run flag is set.


However, I think Andy wrote this back before the scatter plot and Histogram filters work quite as they do. Here he was creating new fields with some data filtered, but now in Scatter Plots and Histograms, you can write filters that do not change the value, they simply filter the record if the filter resolves to true (not 0).

So to accomplish the same thing, you would go into the Filter editor and create a new filter:

Filter Name: All Enrichments
Filter Expression: [Engine] != 1

Then when looking at a Scatter plot or Histogram, the All Enrichments Filter will show in the list, you can toggle it on and off by click on the bulb.

Also not the logic is reversed here ([Engine] != 1) as it is a filter, so it is when the condition is true, that is when the data is filtered, not when the data is shown.

[linzerl]

Got it...thank you both for taking the time to help me..