Theres a reason for having two different tables for high and low, from what Im learning it makes sense that the high is as high as the timing will go and the low as low as it can possibly go. Im thinking there is some formula the pcm uses when it detects knock or some other conditions are met (which is what im trying to figure out) sort of an average with several factors combined like intake temp, collant temp, knock etc....

For tuning purposes making the two tables the same is fine but I wouldnt drive it like that suppose you get some bad gas or something overheats then the pcm has no where to go and BANG youve just made a good reason to buy that 383 stroker.

 

I know several people have been through this before
theres got to be some info somewhere that lists all the tables and according tables that effect each other along with sensor info
this is like shooting in the dark here its bullshit Im getting frustrated

 

when yopu copy and paste the tables the high end rpm's are what is changed the most. if you run into some bad gas you will have to keep her out of the top end till you get some octane boost or some more fuel. i have been running my truck like that for over a year and only ran into bad gas twice.

 

I don't do mine own tuneing but I am running 34* and go up to 36*of timing and I run 87 octane when I am going to the track I put some 93 in and some times I put 100 when I get their.My knock sensors are deleted so I don"t get any knock to take timing out.

 

What is your AFR under these conditions?

 

How many motors have you gone threw again? I think I may know why.

 

Knock Learn can be disabled, just set Knock learn min RPM to something like 7000rpm.

I sure hope that isn't at WOT.

 

Mine is at 24*. I either run all 93 or a mix of 93 and 87 or 89. I seldom got WOT anyway. I was wondering what max timing I could run and use straight 87 or 89 - generally speaking.

 

well to answer all ? I don't know afr @ this time and yes it is @ wot and yes it is all the way to 7400 rpms. I am on my 3rd motor but not the reason I had a hole in the air duck behind the mass air flow sensor and I was tring to run through cats which I move way in the back dy the mufflers they were slam clougged and tring to turn 7000 just the 2 blew them and both motors were in the truck for a while before taken out driving every day.

 

My friend has the 212/218 comp cam in a 5.3 and we move his timing up 2* and he pick up 1.5 tens then we did it to his freinds truck and the samething.All the guys by the shop are running @ least 28*.