I'm seeing some consistent knock up top in the 5k-6k range. I've attached some logs that I pulled form evoscan.

The car is on 91. Should I be adding fuel or pulling some timing?

 

I think you need to add fuel, 11.5 seems to be too lean IMO for 91, since you cant see the hundredths of a point it could be on the verge of being 11.6. Try adding a touch of fuel and take out 1 degree of timing. Then take logs again and see if it helped. Also try logging fewer things in evoscan and you will get a lot more data in your logs. On my logs I get probably 10x the amount of data on a 3rd gear pull

 

what are the main things i should be logging?

boost, egt, afr, timing, knock, TPS, RPM and load seem to the important ones, right?

 

You don't need EGT.

Also make sure you have "log to screen" disable

 

Yea those are the important ones, and like Raptord said, make sure you have log to screen disable and enable logger superspeed...that should give you about 5 times as much data.
I would try pulling a degree of timing from 6k to 7.5k...your fuel looks pretty good, maybe try targeting 11.1-.2 and see how it reacts.

 

11.5 is not lean at all....


I run 93, but run it at 12.0....

 

I just feel as though it might be on the lean side for 91, me personally I run an 11.5-11.6 on 93.

 

running x AFR, is relative to boost, timing, and what the car wants, especially on 91 (fkn sux, trust me)
If you wanna run max boost/timing, u need to compensate for fuel. On 91, the gains between 11.5 and 11.0 are minimal, at best, so if you can run 1 more * w/ 11.0... I would run 11.0. Now, some cars wont like it either way, then u take out a * of timing, and run 11.3. All cars are different!
I would run 12.5 @ spool, 11.5 @ peak, and 11.1 across the board. (on 91)
my .02

 

Post a screenshot of your timing map, it could also be a transition issue.

 

my car goes like this... 12.0 --- peak power, smoothest power delivery. 12.1, and 11.9 give similar reults, but not as smooth/much power... 12.2 knocks, and 11.8 loses about 25 whp.

 

Out of respect to the tuner and the work he has put into this map, I can't post it.

The transitions do seem smooth though. The path taken through the map has transitions from 1 to 2 degrees between one cell to another.

I appreciate all the help you guys have provided so far. I'm going to try and reduce the timing by a degree in the areas its knocking while keeping the transitions smooth and will get back to you guys with my results.

One more thing, how are loads that fall between 2 cells handled? For example, knock at 230 load falls between 220 and 240. Would I decrease timing for the 220, 240 or both cells?

 

Ideally you would rescale to have a 230 column, but otherwise I think you would decrease timing for both.

 

That's a first for me. I have seen slight power changes from variances in AFR but never something as severe as you stated at your power levels. I have seen decent power gains/losses when varying AFR by as much as 1 full point but I think its not likely that 0.2AFR would have such an affect on most setups.

 

I have the dyno sheets to prove it.. it was insane up top. 11.8 across yielded 466 and 12.0 yielded 481(peak, there were greater variances in spots throughout the pull, but for numbers sake)

Tests were checked back to back.. it was puzzling..

 

Can removing timing make the car run slightly leaner?

I'm seeing roughly 11.4 at 7.5k now that i pulled some timing and got rid of the knock.