Does anyone know how to smooth a VE table?

[EvilTSi_97]

Hey all,

I am using Eric's spreadsheet to tune my VE table with. The problem is it seems to be creating crazy spikes or drops to get the job done. One or two cells even show 0! The way I understand DSMLink is this: the ecu doesn't depend on just one cell for it's calculation at whatever rpm x load. It uses the cells around it, too. So I'm not in panic mode just yet.

With that said, my car is running great...but this VE table has got to be cleaned up. It would be nice to know what the car is really doing at each rpm x load point. If anyone has time to kill or can give a way to smooth this out...I would much appreciate it!

Brandon

 

[Bouche Dag]

Hey all,

I am using Eric's spreadsheet to tune my VE table with. The problem is it seems to be creating crazy spikes or drops to get the job done. One or two cells even show 0! The way I understand DSMLink is this: the ecu doesn't depend on just one cell for it's calculation at whatever rpm x load. It uses the cells around it, too. So I'm not in panic mode just yet.

With that said, my car is running great...but this VE table has got to be cleaned up. It would be nice to know what the car is really doing at each rpm x load point. If anyone has time to kill or can give a way to smooth this out...I would much appreciate it!

Brandon

I know this thread is old but I wanted to post in case anyone ever comes along and finds it wondering the same thing.

First off, any cells that are over 100 usually means you need a global fuel adjustment. Looks like your specific example could use about a 2-3% increase in global fuel.

Second, to smooth out the table I use the "Interpolate Values (linear)" feature in DSMLink. I usually select a few cells vertically, interpolate those values, then select a few cells horizontally across of all the cells that were changed, and run the interpolate values tool again. I also just go through the table and make sure that the values are all somewhat logical (no huge jumps between any given cells and logical progressions from one cell to another based on RPM and Load.)

Finally, it's also good to keep in mind the formula to tune your VE table. I like to take some time going over my WOT log, tracking the datalog, and plug the formula in to hit your target AFRs. (Current AFR/Target AFR)*Current VE=New VE value. I then plug in that value for the cells below the one that I just changed.

Hope this helps. I got my car running very well after doing all of this. CombinedFTs are all less than 5-8% during cruise, and I was able to hit my target AFRs all while having a beautiful VE table!