Wideband Converter Spreadsheet

[Holden202T]

I know a few of you have been using this for a while, I've been slowly adding to it as I tune different combinations of fuel types etc so I have added all the ones in that I have used and thought I should update the forum with my latest.

I've labelled it v2.0 as there are possibly previous 1.x out there so no confusion.... also if people have versions with other layouts in it that I haven't got in mine send me your spreadsheet and I can update this one with the tabs so its all in one.

For those that don't know how it works, you need to have a wideband historgram from log, you then copy that info into the "wideband log" section of the spreadsheet you then put in your current VE table data and then make sure the AFR table is the same as whats in your tune then it should spit out a new ve table that can be pasted into tunerpro and then you will want to look at the 3D graph and make sure theres no big spikes, otherwise your good to go and upload back to the car and test.

wideband converter v2.0.xls

(370 KiB) Downloaded 518 times

[heff0018]

Great stuff, thanks. This will be getting a workout soon

[Charlescrown]

Brilliant program. I just plugged in my data and can see some areas that need trimming. Question? What is the VE table offset used for and how is the scaling. My guess it's so you can quickly see where adjustments are needed and it's in percentage?

[Charlescrown]

Oh another question. Do you use the wideband average and what compensation is there for decell fuel cut readings? Thanks

[Holden202T]

ok quick run through on how I normally use it:

like I said, make sure the afr table in your tune matches the one in the excel table....

then you get a log and play it back with wideband histogram and I normally use running average, it seems to be the best way to get good data without massive spikes (you will usually always get some though)

its worth noting, you can play back a log, then go and open another log and play it back and it will just add to the data already collected, so if you had a few logs you can use them all to get average data then adjust from that if you like.

so now we have the info above, we copy it from the 20-100kpa area into the wideband log section of the spreadsheet, make sure when you copy it over its all in the same spot, ie. your last column and row map/rpm readings line up with the same locations in the log histogram.

you then get your latest tunes 20-100kpa VE Table and copy it into the Current VE Table Values area, with the above wideband log and the VE table pasted in, it will calculate the changes and put the new numbers into the New VE Table Values section, which you can then copy and paste into tunerpro.

The Volumetric Efficiency Table Offset is where the maths is done between the wideband log and the target AFR table, it is then what is used to multiply the Current VE Table Values and create the offsets in the New VE Table.....

wb conv 3.jpg (228.43 KiB) Viewed 6531 times

so you can see above, any area with 1.00 is not changed, anything with less than 1, ie. .85 means that cell will be multiplied by 85% and like wise 1.05 will be an increase of 5% fuelling.

So below is the VE Table with the new values pasted into it, now I pasted the whole table in, but you can see its only highlighted the ones in red that have changed, this is handy to see if theres major spikes etc, for example you can see 40kpa-4800rpm is a lot less than the numbers around it, in this case that was deceleration and just the wideband passing this cell and recording a value, so that would be one we'd either want to change back to what it was before or manually smooth it.

wb conv 4.jpg (259.99 KiB) Viewed 6531 times

and this is the graph view of the above changes, as you can see a few spikes needing to be smoothed out.

[Gareth]

Nice, will be using this, thanks 202

[madmaxisback]

Thanks so much. Perfect timing as I was going to start tuning my car next month when I have some time. Legendary!

[Charlescrown]

Thanks. That's just what I did. I see the last 3D graph shows the data errors which I guess it's visible by looking at the numbers in the VE table and then trimming them up or down to make sense with the data around the cell. Again thanks for the spread sheet.

[Holden202T]