What Happens Below Min Baro A Tables?

[Roc8man]

I tried asking this on DP, but no real answer...

If the Baro A tables are set to some specific value, say 70 kPa, then what table does EFILive use if you're below that setting? For example, if 70 Kpa is equivalent to 9000' altitude, then what happens when you go higher and the Baro pressure drops below 70 kPa? Does it shut down? Does it revert to some default?

Thanks,
David

 

[sweetdiesel]

I tried asking this on DP, but no real answer...

If the Baro A tables are set to some specific value, say 70 kPa, then what table does EFILive use if you're below that setting? For example, if 70 Kpa is equivalent to 9000' altitude, then what happens when you go higher and the Baro pressure drops below 70 kPa? Does it shut down? Does it revert to some default?

Thanks,
David

wouldn't it be 70kpa and lower?
what table are you talking about?

 

[Roc8man]

Any of the Baro tables. The value in the table is a minimum not a value and lower or else the C table only works at 2000 feet and above since it is not 101 kPa or 14.7 psi (it is typically around 94 kPa).

Take a look at even the stock tune and you'll notice that the Table A Baro's are around 70 kPa (10.15 psi which is normally around 9000').

I know the OEM's test at high altitude and drive up to Mt. Evans here (since it is the highest paved road in N. America at over 14,000') so they must be able to function, but what are they using...?

Thanks
David

 

[Enigma]

I can say the few times I've gone above 8000' the truck ran the same as it did @ 7999', so I'd say once you enter the high altitude table you stay there until you return to an elevation that's in the medium altitude table. Thankfully when I reached my destination the truck didn't stop running, and did re-start when prompted.

This is just a guess as to how it works, but looking at the way they define the tables they needed to have a number there to calculate against. I assume they simply had to define the “high altitude” table and picked a random elevation at which to set it. As there is no table above “A” I'd say once you enter that table you're in it till you reach the moon, there's simply nothing else to go to.

It is a good question, I wish I had a definitive answer. Does anyone have the definitive answer or we gonna have to test during the summer vacations. (those of us who can afford the friggin outrageous fuel prices to drive anywhere that is)

 

[Roc8man]

If I change the Table A min to a setting above where I live, can I use the scan/logger to see what it's actually running on? Will it show which table it uses?
If so, great idea!

Thanks,
David

 

[McRat]

The engine probably will not run higher than "A" table, not enough oxygen to idle. Even at 11,000' DA, I don't believe I got into "A" table.

 

[McRat]

If I change the Table A min to a setting above where I live, can I use the scan/logger to see what it's actually running on? Will it show which table it uses?
If so, great idea!

Thanks,
David

Make a temp table with all the values "0" and that will tell you if get into that table.