Guys,

I have been searching and it seems that quite a few persons are confused by what TOTAL advance they have...

It seems that individuals are confused whether to add their base timing of 6* to that of the main spark table or not.

Could someone that knows the different year cars outline how the timing is figured for the different year cars...

The one i am wondering about are the 1985 160 cars.

For the 89 I am sure they are already figured into the main spark table....

Thanks guys, I think this will clear up much confusion!

:hail:

 

It all depends on the logic in the tuning software. For instance, TunerCat and the $8D did it one way and then he changed it to the other way. Some editors add the initial in - some don't.

Tim

 

I have an old program called GMEPRO. Any ideas on this? How it was viewed. I think you have to add the base to the viewed, but not real sure.

Any insight?

 

Ok. I have this worked out right now thanks to a friend (you know who you are - I am not mentioning your name for fear of people e-mailing you). The original way that TC did it for the $8D ECM screwed up my thinking. I'm glad you brought this up because it really got me thinking about the way things are done. TC use to subtract the initial SA from the SA tables to show reference SA in the table that was displayed to you. Now he no longer does this. The SA tables in TC, WinBin, and GMEPro are all calculated and shown in the same way now

The value in the SA tables is total advance. You DO NOT need to do any calculations (except to + WOT PE spark, +/- highway spark, - knock, etc.). So, if you specify 36d for max LV8 at 3600rpms then you should be pulling 36d at WOT at 3600rpms as long as you have no knock and as long as your base timing matches what you have the initial timing constant set to in the PROM.

Tim

 

That is why I suggested the sticky...It really does get confusing...

You have confirmed what I thought was going on.. Thanks.

 

Not trying to fuel the fire,
My tunercat def file I take out the 6 degrees in the constant table then look at my timing maps. What you see then is what you get. If it displays 36 then you get 36*.

Not sure if I have the latest def file though.
Now I know gmepro will not take out the 6 degrees. It will display 36*.

Sorry not trying to confuse all over again.
bowtye

 

bowtye,

That is exactly correct. You are running a definition file with the later method for displaying SA used by TC (similar to WinBin and GMEPro). 36 is 36. Changing the constant does nothing except for the fact that if you have 6 degrees specified for this constant then the ECM will add 30 degrees of timing (to get to the total of 36) when you actually drive your car. The SA table is the desired max spark advance. The ECM knows how much to add in order to get to this desired max advance via the constant for the initial SA.

Clear as mud?

Tim

 

Excuse my newness here....

... but am I correct in assuming that the '7747 deals with the SA tables in the same manner?