Hey everyone,

New FlashPro owner here.

I'm running a stock 06 with a Fuji Legalis exhaust. I took a couple datalogs today, and I'm seeing knock counts on cyl #2. The knock level % is always moving, and the knock retard has shown a max value of 7 degrees.

I did a 2nd gear pull and it had 4 knocks only on cyl. #2.

I started with the tuned stock calibration and figured I'd work from there.


With this calibration I've also seen where the AF value goes to 29 when decelerating, and will get very rich at 10.14 on the top end. I added some fuel to the bottom end of the low and high speed fuel tables, and subtracted 20% from the high speed fuel tables where I'm seeing this.

Does this sound like I'm on the right track? How lean should deceleration AF values normally be?

Thanks much!!

 

When engine braking, the AF values will shoot through the roof, so that's normal. Regarding the knocks, you should go back to the stock equivalent calibration to see if it still knocks. If so, then they are probably ghost knocks. If it doesn't knock with the stock calibration, then maybe you should consider getting colder spark plugs (NGK BKR8EIX), then try the tuned calibration again.

Why did you add fuel at the bottom of the fuel tables? In my experience, those load lines are already pretty rich.

 

Thanks Gernby!!

Still new to this....and trying to sift through all the data available.

I added some fuel (5%) to the bottom of the tables more as insurance if it was leaner than it should be. I kinda figured the AF values were ok...but if anything...I'd rather them be a little on the rich side.

I'll have to try the stock calibration and see if it still has any knock.

Appreciate the advice and Y'all will probably get tired of seeing me in here asking questions.

Thanks again.........Red

 

If you make changes to areas of the part throttle maps without good reason, you are really doing more harm than good. The ECU monitors the primary O2 sensor to keep AFR in a safe spot while in part throttle. If you add fuel down low, you will really just reduce the effectiveness of LTFT.

 

I took the 5% back out. While crusing, the AFR was in the 14.5 to 16 range most of the time. I had thought that adding the 5% would make that come down a bit closer to 14-15 in normal cruise.

Was not aware that the ECU took care of most of the part throttle management.

Appreciate all the info...

I need to get a day where I can do some runs and get some good logs.

Thanks again!!

Red

 

I uploaded the changed tuned map where I had mad a few changes. I'm still getting some knock on cyl #2, but less than before.

Gernby, I'm not ignoring your advice to load the stock map back in....just wanted to get a quick look to see if the changed I'd made reduced the count any. I only got 9 in about 40 minutes on the road...so thats down from the 14, but I'm hoping this weekend to get some more conclusive testing done.

With the work schedule, I don't get to run mine as much as I'd like and tinker time has been in short supply.

I know knock is bad, but how much is dangerous?? Also, just out of curiosity....the ignition trim is per cyl and would reducing the timing by a degree or two on #2 help with the knock? I see those trims are in there, but not sure what their intended function is.

Thanks much!!

 

Do you hear any detonation or hesitation? If not, it COULD be ghost knock

 

I don't hear any knock, and don't feel any hesitation during acceleration. During my 40 minute drive home last night, total knock count registered 9. From the datalogs I took and knowing how I was driving, it seems that most of the counts came while part throttle crusing, possibly downshifting.

I have to load the stock tune back in and see if I get similar knock counts. I'll try that this weekend.

I'm looking to try and see any trends where the knock occurs (assuming it's not false knock), and found while checking the logs, I have (and I admit they were not taken under ideal conditions), it looks like the knock I can see happening in the logs happens between 3400 - 3800 rpm under light throttle 16 - 28%.

Thanks for the reply...appreciate the help.

 

I loaded the stock tune back up and went for a ride....got more knock than with the tuned stock calibration. Again, only on cyl #2.

Seems to be mostly in the 3400 - 4000 rpm range under light (less than 20%) throttle. Same place I was seeing knock counts on the tuned stock calibration.

Does this sound like ghost knock?? Should I pull a couple degrees of timing out, or add a few % fuel in these cells of the table??

Thanks for the help.....Red

 

I would treat it as ghost knock