You do the overall WOT timing first. Then when you get knock counts, remove a degree of timing and then remove another degree from the cylinders that had the knock counts. At least, this is what I'd do.

I wish I could do this with S300.

 

After many, many hours geeking out on ignition tuning, I've pretty much decided that there isn't much power to be made over stock except in 2 areas. If you lower VTEC, then it likes a lot of timing advance below 6K. If you copy Hondata's Toda ignition tables, they seem about as good as it gets. You might gain a ft-lbs here or there, but it's going to take a LOT of dyno time to do it. There's also good torque to be made below 3K RPMs by removing the big spike in knock sensitivity between 2K and 3K. You can read about this here. Just be conservative in this area, since I believe Honda may have intentionally reduced torque down low to reduce stress on the bottom end while oil pressure is low.

 

by the look of it, the new verson looks different than what you had gernby. It now has

knock ign limit low
knock ign limit high
knock sensitivity low
knock sensitivity high
knock retard low
knock retard high

it looks quite different than the previous version. I'm sure you mess around with it.

How do you go about reducing knock retard?

I looked at my map yesterday that I was messing around with and it showed pretty low knock retard however today when I went out and tune the car (changed vtec so I get a smoother fuel curve and no spike), I saw the knock retard of 4-5 degree.

To recap:

Map 1 with vtec set at 4900 with a/f mid 12. The spike occurred at around 5000-5050 that would spike up to 13.4. Its weird sometime it would spike up as high as 14.1 or so and some run it would only spike up to 13.3-13.5.

Ign was 29 around 5k where the spike occurred. It also had no knock retard. Around 5.5 it starts to retard by 3 degree.

Map 2 with vtec set at 5100 with a/f at mid 12. Pretty level a/f. However knock retard as much as 8 degree from 2k to 4k. From 6k to redline its only 2-3 degree







can someone shed some light on how to reduce knock retard. I placed the two log into your softdyno spreadsheet and its showing a little loss of torque from 3500 to 6500. And on the IGN its pretty big difference in IGN.

 

you're better off toying with ignition timing on the dyno. and i'd fix the afr's first before even touching the ignition timing tables. you're running lean on both maps.

 

how am i running lean? i am using the A/F ratio and not the a/f corrected. anyways do you know anything about flashpro?

 

I'm still using FPM 1.1.5.6, so I haven't even looked at the new knock control yet. I honestly don't know how it works.

Your AFR's don't look that bad, but I would try to get rid of that lean spike. It's not nearly as lean as a totally stock S2000, so I don't think you're in any danger. You also don't appear to be running much timing

 

Sorry for the newbie question....but how are you guys doing individual cylinder trims of knock with only one knock sensor. How do you know which cylinder is knocking?

Wait, does the F20c have a knock sensor on every cylinder?

J. R.

 

ya thats what I figure. Looking at when it ran more timing, it picked up quite a bit of power across the powerband.

How do you suggest I go about increasing timing. Increase it in column 9-10 for WOT pull only?

 

If the knock sensor detects a knock, it applies the knock count to whatever cylinder fired last.

 

Genius Thanks! Smart computer.

J. R.