I have read through the article listed on this site that describes tuning the VE table by Traxion and Glenn. I understand everything pretty well but there is one thing I am unsure about.

In the article is says

I have made a few data log runs and my BLMs are all over the place most of them are on the high side like 150-160 and some are a little better in the mid 130 -140 range.

I was working out new values to adjust the VE values and from what I can see I will not have values in ascending order. For example I could have a VE value of 60 @ 1000RPMs and 40kpa.

@ 1400RPMs and 60kpa I might have adjusted the VE value to say 50.

@ 1800RPMs and 60kpa I might have a VE value of 55.

From what I read and the way I understood the article was that the VE values should ascend the higher you go in RPMs. I had a look at the stock VE values and it is prettty much like that except for the occasional value here and there.

But If I would redo my VE table fmy numbers would be all over the place maybe it would look something like this.

This is just an example of how the column 50Kpa would look at each RPM

@ 50kpa

RPM VE
1600 40
2000 35
2400 50
2800 45
3200 50
3600 60
4000 40
4400 33
4800 55
5200 50
5600 44

So in the above example is it alright to have values like this? For me to have perfect 128 BLMs I would have to have a table similar to this.

Thanks for reading and hope someone can shed some light.
Michael

 

i think the value at 4400rpm looks a bit funky but yes it is normal to have ups and downs in the ve table. as long as they arent sharp spikes. also the VE values should go up with load an not nessacarly with rpm. rpm is a by product of load. conversly so is load a byproduct of rpm. there is always a rpm where there is less breathing or effiecny. i think if you adjust your table youll be fine however check that value at 4400rpm looks a bit fishy.

 

Thanks Funstick for the info. So it is okay to have ups and downs.The values I wrote were just made up and that is why they might look odd. They are just so that I had an example of what it might look like when I start tuning the VE table.

Thanks!

 

yeah engines breath like sine waves. one you have one your bound to have another. thers always multple patterns etc etc etc. there is no hard fast rule. however you may want to look up VE master and see if itll help you any.

 

Yep I downloaded an Excel program that calculates your new VE value once you input your old VE value etc. Looks very good and will save the calculation time and make it easier.

 

your usign tunercat ?? if so then just copy and paste. i love that software it work so easily for things like that.and yes the excel program make life easier as well.

 

If you are under the 50 Kpa(for example) in the VE Table that would cover anything from 50 through 54Kpa right? Up to the next table of 55 Kpa?

 

when the ecm read inbetween the grid values it does some math and move to the nearest grid edge. im not so sure that it directly averages but it does do some sort of grid edge function.