vems ve table

[cooperquattro]

Guys,what happens to the ve if the ve table doesnt have enough scale.....say the ve table goes to 2 bar and I hit 2.2 bar what ve values will I get if there off the scale??

[diesel des]

Rescale the table?

[cooperquattro]

Yes just about to start doing that,but what ve value is given when its off scale

[quattro-nick]

probably the last number on the ve table i think so to lean
maybe you can temporary fill in a safety limit based on rpm or boostpressure in vems

[cooperquattro]

Nick, that was my thoughts exactly...havent had chance to log it all as yet to see what lambda is...
Can anyone share a pic of there ve table for comparison to mine,thanks

[cooperquattro]

Also what are peoples opinion of the live ve analyzer,trust or not

[a4kquattro]

Also what are peoples opinion of the live ve analyzer,trust or not

it uses the VE at the top of the table, but as long as you are still within the range of the map sensor it will inject more fuel (it does map multiplication).

In other words, a VE of 120 at 200 kpa will calculate a lower ms of injection than a VE of 120 at 250kpa.

[cooperquattro]

So it uses the upper most ve to calculate a lower ve??

[a4kquattro]

So it uses the upper most ve to calculate a lower ve??

huh?

it uses the topmost ve when you hit values beyond the table. an easier way to explain it is this: if the top of your table is 200kpa and you have 120 stuffed in there across the rpm band. lets say you hit 250kpa. Even if you re-structure the table so that you do have values for 250kpa if you fill the table with a VE of 120 across the rpm band at 250kpa its the same injector MS calculated at 250ka regardless of if you stopped the table at 200 kpa or 250kpa.

make sense now?

[quattro-nick]

here an example of a vems ve table (not mine)

[cooperquattro]

huh?

it uses the topmost ve when you hit values beyond the table. an easier way to explain it is this: if the top of your table is 200kpa and you have 120 stuffed in there across the rpm band. lets say you hit 250kpa. Even if you re-structure the table so that you do have values for 250kpa if you fill the table with a VE of 120 across the rpm band at 250kpa its the same injector MS calculated at 250ka regardless of if you stopped the table at 200 kpa or 250kpa.

make sense now?

Ye got it now 😃

[blackS2]

VEMS will calculate with the real MAP and RMP values the sensors can deliver... regardless how the table AXIS are limited... (like most ECUs do)

so the upper row of the table will be used to calculate on higher map readings

and the right cloumn will be used to calculate on higher revs

real trouble begins, when you hit the MAP Sensor limit because additional amount of air is not detected

f.e. we had to solder a 700kPa MAP sensor because our boost pressure in some applications is up to 480kPa...

[cooperquattro]

here an example of a vems ve table (not mine)

Ye i got a table here,was curious to see what values and scale others had,just to compare,as I don't trust the tuner I had 5 years ago...my table seams to be running weak all across the board

[diesel des]

VEMS will calculate with the real MAP and RMP values the sensors can deliver... regardless how the table AXIS are limited... (like most ECUs do)

so the upper row of the table will be used to calculate on higher map readings

and the right cloumn will be used to calculate on higher revs

real trouble begins, when you hit the MAP Sensor limit because additional amount of air is not detected

f.e. we had to solder a 700kPa MAP sensor because our boost pressure in some applications is up to 480kPa...

4800mbar? ? What is this on

[quattro-nick]

Ye i got a table here,was curious to see what values and scale others had,just to compare,as I don't trust the tuner I had 5 years ago...my table seams to be running weak all across the board

you cant compare ve tables because every engine setup gives an other ve table!
if you have other injectors,injector settings,fuel pressure,compression ratio,............ gives this other numbers in the table

i have used "live ve analyser" in vems on my car and it work realy great
fill some data in,set live ve analyser active and take a drive on the road
you will see that some red numbers become green,it means that this part is programmed
but before you begin with this you need first a good lambda table