What is everyone seeing for knock level, knock count and knock retard with the Hondata Flashpro? Im used to tuning AEM and DSMlink on turbo cars, never messed much with NA cars.

 

There is no pattern. I have seen a knock at 15% knock level. It didn't retard the timing so I left it.

 

Usually anything over 80% that registered knock count could POSSIBLY be knock. However, there is lots of ghost knock with certain setups

 

Thanks, it's much easier to tune out knock on a turbo car, I have a set of NGK 2668's coming tomorrow to see if cooler plugs effect knock leval as they would on a turbo car.

 

I haven't retuned it yet but loaded the AEM CAI basemap; I have a Fujita CAI and an otherwise stock powertrain. I'm at 4500 ft altitude on 91.

On my first cut datalog, I saw:

3 for knock count over about an hour of driving with something like 10-20 short (2 or 3 gear) WOT pulls. Two in cyl 3 and one in cyl 2.
The knock % was as high as 60-80s quite a number of times (like 10+-ish) with no retard. I'm typically seeing 20-40% as the noise in the knock level measurement.
I didn't look through it enough to tell you about knock retard, but glancing over it, all I saw was typically 0 or 1 degrees; the most I caught was 5.

I can send the log if you want it.

 

If the knock counts happened while the datalog was being recorded, look to see where they actually happened. If they are all happening for both cylinders at the same RPM point, then you can just retard the timing at that point of the timing map by a bit. However, if they are scattered around at different RPM points for those 2 cylinders, then it might be best to just use the individual cylinder trims.

I've found that my 3rd cylinder knocks MUCH more often than the 1,2, and 4, so I've trimmed timing on that cylinder by -1.5*.

 

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I was thinking about that--that's a good reference to have (-1.5*).

Hondata's help files showed adding a degree to 1 and 4 and subtracting I think 1 degree from 2 and 3, so after seeing knock in those same cylinders, I wondered if that was common to the S2000 and not just a Civic SI issue.

 

For individual cylinder trims, I've been retarding 0.5* at a time.

 

how do you know the knock value for each cylinder. the engine has only one knock sensor???

 

The ECU knows which cylinder fired just before the knock was detected.