[Gmecm] Spark issues on a 747 TBI

[Per Lonnborg]

Hi,

I have just started examinate spark advance on 747 TBI, and got a 
bit confused:

-In the constants table there are four (at least, 
withTunerCat...in Tunerpro I found more) entrys dealing with spark 
advance:

 -"Main Spark Bias" (is 9.8deg stock)
 -"Initial Spark 
Advance" (0 deg) -This one I understand
 -"Extended Spark RPM Slope" In 
TunerPro there?s a note:" strts 3600) I guess that means "starts at 
3600RPM" (5.1 Deg/1K)
 -"Max RPM for Extended RPM Spark" (4200RPM)

Then we have the tables for Spark:

 -Main Spark Table
 -Cool 
compensation Spark Advance
 -PE, Added Spark in WOT

and some other for 
EGR and so...

To the questions:

1. If I want to find out the actual 
timing advance, let?s say in WOT at 4200RPM, I guess I must calculate 
something like:"Main Spark Table" + "Pe Added Spark in WOT" + "Extended 
spark" from the Constants?
In my case: 3600RPM/100Kpa (from "Main Spark 
Table"): 16.2
"PE, Added Spark in WOT":(3600) 7.0
"Extended Spark RPM 
Slope":4200-3600=600, gives 5.1*0.6=3.06

16.2+7+3.06=26.26?

Correct?

2. I dont have the EGR valve or the knock sensor (right now) connected, 
I guess I should "zero" all tables and constants dealing with these, 
not just uncheck them in the "ECM switch table"?

3. As stated earlier, 
"TunerPro" seem to have more tables and constants compared to 
"TunerCat", how?s that? 

/Per

Chevy Monza 75
350 TBI ?747
Stockholm, 
Sweden
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