JP86SS

iTrader: (1)

As I was working through items in my XDF, I noticed that the conversions for the two items were different and displayed values were magnitudes apart.
Both reference RPM as as the controlling value but...
(820E->8212)Knock attack rate = 0.0225 * X
(8213->8217)Knock recover rate = 1.953125 * X

Wanted to make the conversions so the values would be the same magnitude instead of the first one being a two decimal value while the other is in the hundreds. Checked through a couple of older files and found the same conversions.
Any guesses/reasons this was done the way it is?
TIA,
Jp

DENN_SHAH

iTrader: (1)

as we know, knock is bad & you want it to stop as fast as possible. i believe why the attack rate is more aggressive is once knock has started, it takes a little while for the chamber to cool off before timing can come back up without getting more knock. i think the slower recovery is better.

JP86SS

iTrader: (1)

Got all that, why would the calculation be so different for the same thing?
Just looks goofy to a user that one entry is done in "0.xx" and the other is "xxx.0" units.
Seems to be a good place to divide by 1K and have both items be the same scale.
Know what I mean?

DENN_SHAH

iTrader: (1)

i see i misunderstood what you were asking you><me
maybe it goes back to the early 3-C systems with knock control?
it wouldn't surprise me if you understand this stuff better than what the guys who originally wrote it did back then.
if you can make a change & it still works right, i say do it.

RBob

iTrader: (1)

The knock attack is done in the spark minor loop, 80 times a second. The knock recovery or decay is done in a major loop, 10 times a second. Which is actually done 5 times a second as the minor loop counter is checked for which loop is being executed.

Hence the difference in conversion.

RBob.