cool looks like ur at 35 i guess. but you have inspired me to attach some pics of my own. here are all my spark tables. anybody have any suggestions?

 

it looks like my WOT timing is way too low. everyone says there at like 36-38 but mines is in the low 30s. should i bump it up to 38 or is that too big of a bump?

 

I thought you said you were in the 40's???? But on your graph at 100% MAP (or WOT) you max out at like 31.5ish.... That is pretty low and you say you are knocking at those values????

My Gen VI DFI was setup much the same way but my max advance at WOT 100% MAP was like 36-38 degrees depending on what I was doing. NA was setup at like 37 degrees. When I went with the 150 shot I turned it down to 32-33 degrees (2 deg per 50hp of nitrous)..... Never had knock with that timing and good gas...

I wouldn't recommend going up to 38 if you are having REAL knock at those values. You could destroy your pistons. I'd say put good gas in it, turn it up to 34 degrees and run it. Where are you seeing knock? Is your PCM recording knock or are you hearing it????? If you put 104 octane in it with those values the same and it still records knock it is false knock guaranteed....

 

i said 40 based on my ecm constants table due to my lack of tuning experience. i now know that doesn't mean much and it is based on the main spark advance tables. i'm seeing (on datamaster not hearing) knock at different times there is really no rhyme or reason to it. at first it looked like IAT's of 90 and above were causing it but it also knocked a few times at the lower temps as well. it also knocks above MAPs above 40 but not below, knocks at all different rpms and tps%. its not a constant knock though . i keep wanting to get rid of it by fixing something instead of just tuning knock sensors to be less sensitive. its looking like im just going to have to try the 104 octane and say **** it . i hope the 104 doesn't mess up my o2 sensors. its weird that the tuner made my tables less than the stock values. i wonder if he did that because i had a bad fuel pump that was crapping out after 4800 rpm when i went for the tune originally.

 

how do u check timing on alt1

 

using a datalogger and looking at ur tune using software like tunercats or lt1edit

 

You can generally set it as high as you want until you start to see knock retard, then back off a few degrees and that's a good setting.

Also fyi here is a picture of the stock timing tables:

 

[QUOTE=infinitebird]You can generally set it as high as you want until you start to see knock retard, then back off a few degrees and that's a good setting.

i have knock now at random times but i wont know if its real or not until i put the 104 octane in it. it looks like im well below stock timing for some reason.

 

 

thanks ari.

 

34*, but probably wants more. I'll know once I get it on a dyno.

 

Here's in one I've tweaked for a stalled automatic car.

 

Thanks red. What were the mods on that car? Also when you or anybody else is adjusting these tables how do you come up with a value to input in each cell?

 

Heads/cam car. Cam similar to a gm847.

 

hey to flip tis thread around. What timing are you running at idle and what rpms are you idling at?