Red_bull

He guys,

At the moment i am mapping my car. Its a std 1.6 cvh rs turbo and i had a map prepared, but i had to take it down a lot. Around ambient pressure i have a VE of 60 - 70 i believe. Now its running 1.2 bar max and i am seeing numbers that feel too low.

I checked my injector settings and i don't know what is wrong. What are normal VE values for a cvh around ambient pressure? 800-4500 rpm range?

Am i expecting the wrong things? If not what can i check so VE matches again with reality? Tomz i can upload my settings

Red_bull

So my injectors are 380cc/min at 3bar pressure with a 16.5 to 18ohms impedance. Made by Lucas. MJY10023

Settings MS
Engine Displacement 1597cc, injector flow 380 cc/min, AFR 14.7, 2 squirts per cycle alternating giving me a required fuel time of 7.1ms

VE table currently (above 4000 not done yet and not finished i know it still needs tuning)
http://i216.photobucket.com/albums/c...13EC1E7EC9.jpg

Red_bull

Nobody with an idea? Mapping is further done, however VE values are still too low

Chip

iTrader: (3)

If you are talking about on idle, that doesnt sound far wrong.

What does it read with the ignition on and the engine NOT running? Should be 100

Red_bull

No, not on idle. Sorry i have difficulty explaining myself so here i go again.

At 100kPa (so engine running with load on) at the moment that i am not using boost. I have a VE of 60 to 70. Now i have mapped it to 150kPa and i haven't gone over a VE of 90.

So clearly VE is too low, but i don't understand why. I am using MS2 with MSextra

Karlos G

iTrader: (4)

There are no 'correct' values as such, too many variables effect what your VE values are, but your table looks ok so far.

Red_bull

Figured that out on the MSextra forum in the meanwhile, however i didn't expect that as VE is a real value. If they are low it suggests that cylinders aren't filled well

Ripped from wikipedia
Volumetric efficiency in the internal combustion engine design refers to the efficiency with which the engine can move the charge into and out of the cylinders. More specifically, volumetric efficiency is a ratio (or percentage) of the quantity of air that is trapped by the cylinder during induction over the swept volume of the cylinder under static conditions. Volumetric Efficiency can be improved in a number of ways, most effectively this can be achieved by compressing the induction charge (forced induction) or by aggressive cam phasing in naturally aspirated engines as seen in racing applications. In the case of forced induction volumetric efficiency can exceed 100%.

Chip

iTrader: (3)

I would stop obsessing over the VE values, if you just change your injector scale values slightly the whole lot shoots up or down anyway, so its more likely the estimate its made for your injectors is wrong than that your engine is not working correctly, get it on a rolling road if you want to see if its healthy and see if it makes the power it should. Or do a leakdown test etc.
Dont try and determine it from that table.