Speed Density: A little confused
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From: Hamden, Connecticut 06514
Thread Starter
Evolving Member
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From: Hamden, Connecticut 06514
A better VE formula will be:
VE= Load/(MAP*(298/(273+MAT)))
So, it will vary as MAT changes. But using a simple load/map will be fine. As stated, you can tweak your tune with the tables. The formulas are just to get rough starting values.
Also, for load, keep in mind the notes from mrfred a while back:
spark advance lookup: For air temp below 77F, baro+airtemp compensated load is used for spark advance. For temps above 77F, then baro compensated load is used.
afr lookup: for closed loop conditions when load is < ~20, uncompensated load is used, otherwise, baro+airtemp compensated load is used. This means that baro+airtemp compensated load is used essentially all the time for AFR lookup.
Eric
VE= Load/(MAP*(298/(273+MAT)))
So, it will vary as MAT changes. But using a simple load/map will be fine. As stated, you can tweak your tune with the tables. The formulas are just to get rough starting values.
Also, for load, keep in mind the notes from mrfred a while back:
spark advance lookup: For air temp below 77F, baro+airtemp compensated load is used for spark advance. For temps above 77F, then baro compensated load is used.
afr lookup: for closed loop conditions when load is < ~20, uncompensated load is used, otherwise, baro+airtemp compensated load is used. This means that baro+airtemp compensated load is used essentially all the time for AFR lookup.
Eric
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From: Hamden, Connecticut 06514
so based on some recent suggestions and findings i looked at my logs and it looks like 100 load should equal 115ish kpa.
If that is the case should my kpa to load table be setup as the attached instead of 1 to 1?
Edit: looks like i should change the 60 and 80 load as well
If that is the case should my kpa to load table be setup as the attached instead of 1 to 1?
Edit: looks like i should change the 60 and 80 load as well
Last edited by Big Bald; Aug 6, 2013 at 10:39 PM.
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