100 kpa = 1 bar ?

[driftkids]

one thing i dont understand, is 100 kpa is 1 bar, right ? why is 100 kpa in vipec referred to 0 bar, and 200 kpa, 1 bar and so on?

[Simon]

It depends if you are talking in absolute or gauge pressure.

In the Vi-pec we have an on board baro sensor so the main fuel table can be done in gauge pressure resulting in a 0Kpa reading at atmosphere.

Other settings such as MAP limit are in absolute.

[driftkids]

when the engine is off the kpa is 100.. this is a bit confusing i think

[Dave Kriedeman]

Hi driftkids,

with the MAP sensor reading, with the engine not running the map will read 100 Kpa as this is equivalent to atmospheric pressure, ( 1 Bar or 14.5 psi ).

So if 100 Kpa equals 14.5 psi/1 bar atmospheric pressure , then 200 Kpa '''''''(ABSOLUTE)'''''' equals 14.5 psi/1 bar of positive pressure ABOVE ATMOSPHERIC PRESSURE.

Look at the Baro pressure when the engine isn't running for a more exact reading of the barometric pressure.

If you set your axis up as MGP (Manifold Guage Pressure) your 100 will be replaced with 0 and 1 bar will equal 100 Kpa, (14.5 psi), if this makes things easier for you.

If you do use MGP as your Y axis on the fuel table, this will also allow for Barometric compensation.

Just a side note also,

With the fuel Y axis set to MGP your vacuum area of the fuel table will read in negative values.

Hope this helps

Regards

Dave.