[WolfPlayer]

Guys,

I've been running a series of tests in order to determine how the knock correction maps work (A/B/C). So far, no conclusions. However, here is the data. I will add to this with more tests as I complete them. Total KA is the total Knock Advance applied at WOT when running the specified values listed in KC A, KC B, and KC C.

KC A	KC B	KC C 	Total KA
1	2	3	2
0	2	3	0
1	0	3	1
1	2	0	1
2	2	2	2
4	4	4	4
1	4	4	1
4	1	4	4
4	4	1	4
2	4	6	2
2	4	6	2  (this was with an ECU reset)
1	4	6	1
2	1	6	2
2	4	1	2

Each test is done by setting the 2.0 and higher load value in the knock correction table to the same value at all RPM points. Basically, if you looked at a particular KC table then you would see the same value in all cells equal to or greater than 2.0 Load at all RPM points. For example, the first entry above (1/2/3) would have KC A set to 1 degree at 2.0 load and higher at all RPM points. KC B would be set to 2 degrees at 2.0 load and higher at all RPM points. KC C set to 3 degrees at 2.0 load and higher at all RPM points. This is very safe because you'll end up running less timing than what the factory runs ... and allows you to run tests while running safer than OEM values.

For the record, an ECU reset needs to be done before beginning these tests because I have found that the ECU will store knock retard amounts and apply them up to WEEKS later. I was getting 1.5 degrees always subtracted from 5000+ rpms. An ECU reset cured this.

The total knock advance above (KA Total) is what was shown in Cobb's StreetTuner logs. These logs were obtained by doing 2 WOT runs for each test. These runs were done by doing one in 2-3 and one in 3-4. For example, the 1/2/3 test that produced a 2 degree knock advance was done by doing a WOT run starting off in second and ending at the top of third. I then kept the log running and did another run starting off in third and going to close to the top of 4th. I verified that the IAM was at 1.0 the entire time for any data above.

I petition the StreetTuner community to help out in these tests and to either verify what I have done or to add new values above. Let's get some data to try to figure out how these tables work. Right now, the knock advance seems to follow KC A more than anything else. But, this doesn't explain why STOCK KC maps will often yield values of 6-9 when KC A only has 4 degrees up until 6000 in the high load sector (2.90) and 5 degrees up until 6000 in the 2.25-2.75 load sector.

t

[cnstman]

Thanks for transfering this info over here, i can't figure out how to make cobbs forum send me updates when new posts are made.

[TurboQueef]

Originally Posted by WolfPlayer

Guys,

KC A	KC B	KC C 	Total KA
1	2	3	2
0	2	3	0
1	0	3	1
1	2	0	1
2	2	2	2
4	4	4	4
1	4	4	1
4	1	4	4
4	4	1	4
2	4	6	2
2	4	6	2 (this was with an ECU reset)
1	4	6	1
2	1	6	2
2	4	1	2

t

Tim, Thanks for posting this data ... can you show how the values correlate to RPM, BOOST, KNOCK SENSOR. Can you make a screen print of the actual map with X & Y-axis labels defined?

Thanks,

[WolfPlayer]

Originally Posted by TurboQueef

Tim, Thanks for posting this data ... can you show how the values correlate to RPM, BOOST, KNOCK SENSOR. Can you make a screen print of the actual map with X & Y-axis labels defined?

Thanks,

I can do better than that. I'll post all the logs so you guys can look at them for yourself. I'll make a post when I get them uploaded sometime within the next couple of days.

t

[WolfPlayer]

Nick,

Basically, I gave up once I figured out how to tune the tables (as per my response to you in that other post - a thread or two down). There's just so many things to do that this got put on the back burner due to figuring out how I wanted to tune for WOT. Now that WOT is taken care of ... I have been doing stuff like the EBCS tuning, the helper spring tuning, etc. However, I'd be willing to start it up again. I just think that if we do start it up again then we come up with a definitive action plan and a definitive course of action.

t

[WRX_XB9R]

I am in for testing. I would also like to figure this out. However I think that we need to move the values into some areas where we may experience knock. Then see how the maps interact with each other.