I just received my tactrix cable today, so I decided to do some logging. Currently, I am particularly concerned with knock and timing advance since these are areas where I am just starting to gain understand in. Here are three graphs that I created form the data of three different pulls. The first two charts are longer pulls done in third. The last chart is from a pull done in fourth after the previous 21.5psi chart's pull in third. Any analysis, opinions, or suggestions are appreciated.


Knock values are in blue, timing is in pink:













What knock values are considered acceptable? How much timing advance should I be striving for?

 

The knock on the last chart looks pretty bad, but I am by no means an expert.

 

Knock sums on the last chart are unacceptable. You want KS's of 3 or less (some will say none ).

 

first thing you need to do is search for

evoscan, dataloglab, and the evoscan log converter to convert to datalablog.

These apps will let you do some pretty good logging with the tools we have available.

 

Excessive blocks of timing on both the low and high octane ignition maps. Dynoflash I suspect?

Start again from a nice factory map would be my suggestion.

 

Dynoflash did it first, then I had a local tuner attempt to fix it.

Where can I go about getting a nice factory iginition map from?

 

Also, how much timing should I be seeing during these pulls?

 

+1

 

John good call on the Dynoflash...I see LOTS of 8's

Things look good until your timing jumped from a 10 to a 12 at 6000 in whatever load cell you were in...260 maybe. Then its up to 17* when you are hitting 5 counts. I would smooth the timing out tapering back in from 260 towards 240 and lessen total timing at 7K down to 14 or so. Curve it very smoothly between where it goes from the 10's at 5500 up to 14 and then make a pull and produce another log.

Other data that comes in handy is air temp, altitude, humidity, octane, etc.

 

Thanks for all the info guys.

 

+1

 

I made some changes to my timing and fuel curves and here is what I got. This is @ 23psi with a fuel mixture of 12.0-12.5:1:



Throttle....RPM........Knock........Timing
35........ 3781........ 0........ 34
35........ 3781........ 0 ........34
35 ........3812........0 ........34
35 ........3843 ........0 ........34
35 .........3812........0 ........34
36 ........3875 ........0 ........31
37 ........3875 ........0 ........29
42 ........3875 ........0 ........27
46 ........3937 ........0 ........23
48 ........4000 ........0 ........19
49 ........4062 ........0 ........15
54 ........4125 ........0........ 11
57 ........4156 ........0 ........9
65 ........4281........ 0 ........6
69 ........4343........ 0 ........6
74 ........4375 ........0 ........5
82 ........4531........ 0 ........5
87 ........4593........0........6
98 ........4718 ........0 ........6
100 ........4812........ 0 ........6
100 ........4906 ........0 ........6
100 ........5000 ........0 ........7
100 ........5093........ 1 ........7
100 ........5250 ........0 ........6
100 ........5406........ 0 ........7
100 ........5500 .........0 ........6
100 ........5625........0 ........8
100 ........5687........ 0 ........9
100 ........5812........ 0 ........10
100 ........5906........ 0 ........12
100 ........6000 ........0 ........11
100 ........6125 ........0 ........13
100 ........6218........0........13
100 ........6281 ........0 ........13
100 ........6375 ........0 ........15
100 ........6437 ........0........ 15
100 ........6531 ........0 ........15
100 ........6593........ 0 ........16
100 ........6718........ 0 ........17
100 ........6781 ........0 ........18
100 ........6843 ........0 ........18
98 ........6906 ........0 ........19

I slightly bumped up the fuel at 5,000rpm. Hopefully that will eliminate that one count of knock.

 

Looks better, but can your car perform back to back pulls without knock?

Also, before you dial in your timing, you really need to settle on how much boost and what AFR you're going to run. So far your runs have been 19.5, 21.5 and 23 psi ... as you turn up your boost, your timing will have to be reduced. Also 12:1 to 12.5:1 AFR is way too lean on pump gas. If you're running 93 octane, you probably don't want to run leaner than 11.5:1, if not more like 11.2:1.

l8r)

 

That run was with a 93/100 octane mix. And yes, and can perform back to back pulls with no knock. I just richened up the fuel mixture a little bit. I would like to be around 11.5:1 on 93 octane @23psi.

 

That fuel mix is only good for dialing in your AFR if you're ultimately shooting for a pump gas tune. I suspect that at the very least you will have to pull timing above 6000 rpm for that tune to work on pump gas. I'd also log the hell out of the car to make sure that it's hitting no more than 11.5:1 AFR before going straight pump gas.

l8r)