Tired of reading about VE!!!
06-19-2007, 08:33 PM
#1
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Tired of reading about VE!!! Ok, the last few months I have been reading, reading, reading, and yes more reading about tuning, sensors, VE, air mass, etc... I have yet to have that AH HA!! moment where VE tuning finally makes sense to me.
My main problem is that I cannot understand how tuners can just read the specs for a cam, heads, and intake and just crank out a VE table. How can they do this so quickly? It takes me weeks to get my VE right, with LT and ST trims inputed in a spreadsheet and a wideband. I know I am missing something. Can anyone explain this madness to me?
My main problem is that I cannot understand how tuners can just read the specs for a cam, heads, and intake and just crank out a VE table. How can they do this so quickly? It takes me weeks to get my VE right, with LT and ST trims inputed in a spreadsheet and a wideband. I know I am missing something. Can anyone explain this madness to me?
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06-20-2007, 02:55 PM
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I have a WB but I just use it to monitor my AFR to see if I am in the right area. Its fairly new to me, hence why I probly still dont get the VE table just yet. I saw a few write up to interface it as a PID in HPT, but I just havent done it yet. I though the WB just reads in stoich %, so how would I copy and dump into the VE?
Forgive my ignorance, I probly read more then I practice.
Forgive my ignorance, I probly read more then I practice.
06-20-2007, 03:11 PM
#9
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With your tune set up for dialing in the VE table (i.e. disable each of MAF, CL, DFCO, COTP, ...), the VE table is the only influence on getting your wideband measured/actual AFR to equal your PCM commanded AFR...
your software should already have a pid/histogram to create an array of correction factors which you multiply back into the VE table to "correct" it to achieve actual AFR following commanded AFR...
all you have to do is set up your tune, log, apply the histogram, flash...
you repeat several times and and you'll see that actual AFR follows commanded AFR;
you don't have to worry about any histogram cells that don't hit (they'll never get hit);
optionally, you can re-enable the MAF and do the same thing for the MAF table;
optionally, you can re-enable CL.
your software should already have a pid/histogram to create an array of correction factors which you multiply back into the VE table to "correct" it to achieve actual AFR following commanded AFR...
all you have to do is set up your tune, log, apply the histogram, flash...
you repeat several times and and you'll see that actual AFR follows commanded AFR;
you don't have to worry about any histogram cells that don't hit (they'll never get hit);
optionally, you can re-enable the MAF and do the same thing for the MAF table;
optionally, you can re-enable CL.