lt1 $ee knock retard caused by echo?

[zoomo]

All my tunes have it locked at 3-4 degrees na

Do you mean max knock retard? i have mine set at five, i will lower it some maybe to 3. I dont think this is real knock retard, ive never heard the car clatter and cant imagine that it would be with the set up and timing.

still kind of confused about tuning the knock attack and recovery rate though i guess i will try adusting both and see what happens


Edit: well i found a little more info on tuning these tables on hp tuners, although of course some things are different, so i may have went too far.

i ended up adjusting the fast attack rate 10% lower (it was already adujust lower by nearly 20% from stock) so thats 30% lower in all on the fast attack rate

my understanding from reading and logic is that the "fast attack rate" is the rate in which the timing is reduced?
although im not sure, it seems to be a confusing subject as some people say exactly the opposite ha.

i also doubled the recovery rate, this seems pretty straight forward by the name. I'm assuming this is how fast it removes the knock retard?i read that was ok, though a lot of the things i read said adjust it by slight amounts.

ive also found some stuff about adjusting the low octane table, and some talk about the decay tables, but i havent done anything with that stuff yet.

My max retard was at five, i also lowered it to 3 in both tables.

im slightly confused about the terminology of the knock recovery table, and the fast attack table, because i guess really they could need to be adjusted opposite of what i did, if im mis-understanding the description.

thanks for all the help and advice as always guys, im gonna load this tune up shortly and see if it changes anything, although unless it makes things worse i probably wont know until i hit the drag strip next week.

Last time i was there trying to tune out random spark knock i had to get towed home cause i killed my pcm, i guess this time ill take a jump box and my spare pcm haha

[zoomo]

Just in case anyone needs this information in the future heres what ive figured out so far

After doubling the recovery rate, it caused the knock retard to stay for a very very long time. After it picked up any knock it would continue to pull timing for about a minute every time i would accelerate even a little.

So i cut the knock recovery rate back to stock, then cut it in half, this seems to be good, if not too good on the knock recovery. it will pull the timing and actually start to add it back in within a couple second, which isn't particularly a good thing if you are encountering significant, real spark knock, but for tuning purposes it kind of helps you find where your knock is occuring. I think i will leave it here.

Now for the fast attack, i left this alone, adjusted at 30% lower than stock until the testing with the recovery rate was done. i adjusted this back to stock, then 30 % higher than stock, and at this point i am not getting any knock retard where i was.

Although it is night time now, so the air is cooler, could just be that but i will continue to test it, and add timing back in if it continues not to get knock.

im running tuner pro , im not sure how these adjustments will work on anything else.

on another note, im getting about 4 degrees of weird advance at wot, like i have to have it set to 26 to keep it at 30 and it climbs to 31 at 4k for some reason.. even though im set at 26 from 2600 rpm on.

Ill let yall know if i find any thing else. and hopefully this is what my problem was and i was just imagining the "echo" spark knock lol

[SSlowBoat]

I think you found your problem. Nice work.

[zoomo]

Are you thinking it was the attack rate?