VE table cell question
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From: Desert
Car: 1991 Z28 Vert
Engine: 383 single plane efi
Transmission: T-56
Axle/Gears: 8.8 with 3.73s
VE table cell question
I was doing some datalogging and tuning the other night and ran across a question. Suppose for instance, that in my datalog my RPM was dead on at 1450 RPM and the MAP was 30 kPa. Which cell would the ecm be referencing, a single cell, or the average of the two cells (1400 and 1500)?
But suppose I was in the upper VE table and my RPM was 1900. Would the value chosen be only the 2000 RPM VE cell?
But suppose I was in the upper VE table and my RPM was 1900. Would the value chosen be only the 2000 RPM VE cell?
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From: Chasing Electrons
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Re: VE table cell question
I was doing some datalogging and tuning the other night and ran across a question. Suppose for instance, that in my datalog my RPM was dead on at 1450 RPM and the MAP was 30 kPa. Which cell would the ecm be referencing, a single cell, or the average of the two cells (1400 and 1500)?
But suppose I was in the upper VE table and my RPM was 1900. Would the value chosen be only the 2000 RPM VE cell?
But suppose I was in the upper VE table and my RPM was 1900. Would the value chosen be only the 2000 RPM VE cell?
On a 2D table such as VE2, the ECM interpolates between the 2 adjacent cells (rows).
The SA Logic writeup at the very end explains this along with an example. See the Tuning Guide Book sticky, Chapter 5, 8063/8746/7747 section.
Note by VE1 and VE2, this is '7747 ECM ($42) stuff, not the '7730 $8D mask.
RBob.
Thread Starter
Joined: Jun 2003
Posts: 5,028
Likes: 78
From: Desert
Car: 1991 Z28 Vert
Engine: 383 single plane efi
Transmission: T-56
Axle/Gears: 8.8 with 3.73s
Re: VE table cell question
On a 3D table such as VE1, the ECM interpolates between the 4 surrounding cells (rows & columns).
On a 2D table such as VE2, the ECM interpolates between the 2 adjacent cells (rows).
The SA Logic writeup at the very end explains this along with an example. See the Tuning Guide Book sticky, Chapter 5, 8063/8746/7747 section.
Note by VE1 and VE2, this is '7747 ECM ($42) stuff, not the '7730 $8D mask.
RBob.
On a 2D table such as VE2, the ECM interpolates between the 2 adjacent cells (rows).
The SA Logic writeup at the very end explains this along with an example. See the Tuning Guide Book sticky, Chapter 5, 8063/8746/7747 section.
Note by VE1 and VE2, this is '7747 ECM ($42) stuff, not the '7730 $8D mask.
RBob.
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