Spark table questions

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05-31-2014
trmccarty

Spark table questions

Greeting all,

Working on my timing tables, 92 Corvette LT1 using $DA2. I have made a few data logs. I have noticed spark retard in about the same RPM and load in each log. I have reviewed the logs in the monitor and with trace on.

I guess my questions are. Is it best to adjust the table only in the cells the spark is being retarded in during the event (from 1-4 connecting cells) or just the cell the retard started in?

Also would you start out removing 1 degree at a time until the retard goes away?

I also noticed the timing tables in 3D look rough. Should I use the smoothing tool on them like the VE tables?

Thanks for your help!
05-31-2014
steveo

Quote:

Is it best to adjust the table only in the cells the spark is being retarded in during the event (from 1-4 connecting cells) or just the cell the retard started in?

i'd remove 2 degrees from the cell that the knock count increased in (probably the same one that the spark retard started in) then 1 degree from each of the surrounding cells, then log again to see how it works.

Quote:

I also noticed the timing tables in 3D look rough. Should I use the smoothing tool on them like the VE tables?

probably not a great idea; best to do that smoothing manually. but why dont you post it up and we'll have a look to see what you mean by "rough"?
05-31-2014
RobertISaar

i only do it in the cell it started from, and at the minimum possible decrement(with most PCMs, .35*, but i think with the LT1, it is in 1* increments?)
05-31-2014
trmccarty

2 Attachment(s)

Thanks for your reply. Here is screenshots of my spark tables. When I look at them they seem rough compared to the VE tables. This maybe normal.
06-01-2014
steveo

Quote:

Originally Posted by RobertISaar

but i think with the LT1, it is in 1* increments?

lt1 has a timing resolution of 0.5 degrees, both in reference pulse and in table resolution; and since there's one slot in the optical sensor per half-degree, those aren't interpolated or anything.. when you add 0.5 degrees of timing, it's 0.5 at the cam, period.

Quote:

Here is screenshots of my spark tables.

imo those spark tables are just fine as far as smoothness goes.