Help me, I'm sinking!!!!

[joecar]

Odd Boy,

It's a long story that gets shorter the more you do it...

You need some "definitions":

SD = speed density
The PCM's method of calculating cylinder airmass from engine speed and intake air density (which is computed from MAP and IAT);
i.e. not using the MAF for calculating airmass.

CL = closed loop
Using closed loop feedback from the O2 sensors to trim the AFR to the stoichiometric AFR.

OL = open loop
Ignoring closed loop feedback from the O2 sensors.

AFR = air-to-fuel ratio
14.7 is stoichiometric (the ratio of air and fuel to chemically achieve a "complete" burn),
this is too lean at WOT/load meaning that it is not safe for the motor (detonation), but it's good for cruising.
12.6-13.2 is suitable for best peak torque (at the peak torque RPM at WOT) and is safe for the motor.

VE = volumetric efficiency
The VE table is probably mis-named... it is really the airmass table;
it gives the pressure/temperature "normalized" airmass for any given RPM/MAP operating point;
the VE table has units g*K/kPa (i.e. mass normalized for pressure/temperature).

Bascially, by going into OLSD, you eliminate any influences from:
- AFR trimming from CL O2 sensor feedback,
- airmass calculated from MAF sensor.

This leaves the VE table being the only source for computing airmass.

The goal of the AutoVE procedure is to get your VE table "corrected" such that the wideband measured ("actual") AFR matches the PCM commanded AFR...

when actual and commanded AFR's match, you can then simply set the commanded fuel table for the specific AFR's that you or someone else determined (by experiment) produces the best torque and/or power; this makes tuning for torque/power easier (what you say is what you get)...

it also means that you know without a doubt what AFR your PCM will produce at any operating point; this is how you keep your motor in the "safe zone" and make the best torque/power.

By reading thru the AutoVE tutorial you might be able to see (read between the lines) the relationship between some of the tables mentioned.

Cheers,
Joe