I think you may be a bit too lean in the spool too.

I would defiantly do a few more logs with not as much stuff being recorded. When you started seeing knock you only had a resolution of 0.4 to 0.6 seconds, so you jumped 1000 rpms, 2 full points of AFR, 6 psi, and jumped 8 degrees of timing... all in 3 lines of the log which is where your knock started.

So I don't think we can say if the timing jump is causing the knock or if the knock pulled timing, or what your AFR's are doing right when knock starts.

Try to get more resolution... try only logging rpm, Load, tps, boost, afr, timing, and knock sum and see what you get.

Can you post up pics of your timing and fuel maps?

 

Thanks for the feedback. I'll cut it down to the basics, alot wasn't of use to me, but if its worthless to everyone else, then sweet

I'll do another log shortly and then post up some pics of the maps.

 

Ok, heres 2 logs, one is 3 pulls from 2nd gear which look good, and I aborted a 4th gear pull at the end as I just wasn't accelerating. I then did a 4th gear pull in the 2nd log.

If you need anything further, let me know.

EvoScanDataLog_2010.02.26_16.27.07.csv

EvoScanDataLog_2010.02.26_16.29.52.csv

 

Good help

 

i'll take a look at the new maps you put up tomorrow, But tracing the original log you put up there shows the knock happened right as your boost was starting to take off between 6 and 10 psi, where the timing map is also making some pretty big jumps between cells.

You might be able to do a bit of smoothing in the timing map to make the transition smoother... but looking at the map for my IX, it doesn't look much different.

I'd first try adding a bit of fuel in the 2500 to 3000 in the 140 to 200 load range to get the AFR down to 11.5 to 11.0 range. That should also slow the spool a bit and maybe not spike so hard (not as fun though).

You could also try re-scaling your map so you have higher resolution during the ramp up region... but you'll end up sacrificing drive-ability somewhere else. I'd do this as a last resort though.

good luck!

 

^What he said. Your maps Fuel map seems pretty decent, but at the higher load range(200s) your a little rich... not by much though. Also spool up looks like its leaning out a litte too much.

 

Heres an update log and maps. I now can do a clean run in 3rd off the wastegate, so about 12psi, can't do one at 16-17psi. Goal is to be running 20psi.

EvoScanDataLog_2010.03.13_14.01.37.csv

 

what's the rest of your setup?

 

Most is in my signature, but have a sard FPR and I've replaced the factory 450cc injectors with 565cc ones from a WRX STI. The STI injectors have the same plug as the Airtreks and are high impedence, so they are a plug and play swap. I've got the Trims looking alot better now, Low is basically zero and mid is -2.3 and am still adjusting.

The only difference between this engine and an Evo7 engine at the moment is it runs higher compression and the intake manifold is longer.

 

I'm not seeing too much from the log that's standing out at me. I thought your timing map may have had some big jumps, but on the log the timing was nice and smooth with no big jumps.

It doesn't look like false knock, so my only other suggestion is to pull some timing and see if it goes away.

If it doesn't then you're most likely reaching the limit of your equipment or fuel.

 

Thanks, will take some more timing off. Apparently others have ran 20psi on the same fuel I'm using, so I know its possible.

I have been told the knock maps in the Airtrek are alot more sensitive than an Evo, but they look very different between them and have no idea where to start if thats part of the issue.

 

looking at my log, knock comes in pretty bad at 220 load, 4000rpm, my timing in that cell is 1, should I go 0 or negative in it? From 3000rpm my timing is retarded, is this normal?

 

Sorry... I just noticed something odd... The timing, RPM, and Load in your log don't match up to your high octane ignition map that you have posted above...

Where you first see knock at 3875 rpm @ 210 load... you should be somewhere between 0 and 2 degrees timing. Your log is showing you at -4...

Either your car is running off of a different ignition map or you have something else going on. Take a look at all of your ignition maps... I think there's 3 high octane and 3 low octane (on the IX's ecu anyway). Make sure all 3 High octane are the same, and all 3 low octane are the same, and then post up both. You may be adjusting a timing map that your ECU isn't using which is why you can't get rid of any knock, or you car is always on a low octane map.

Cheers,

Eric

 

BTW... If your car was on a high octane map that you haven't changed... be very careful when you make all 3 the same because the timing map you posted up would be more aggressive than what your log was showing and if the knock is real, could make it worse...

To your question about changing the timing in cell 220/4000, that would not be the only change i would make. You want to smooth out the cells around it as well to make sure the ecu timing cells your car moves through is as smooth as possible.

Your log shows from 3000 rpm up that it is pretty constant around 210... which is taking an average of the 200 and 220 cells. So i would start up at the 2500 rpm range, in the 200 & 210 load cells, and change them from 0 and -2, to -1 and -3. Then move to the next RPM range of 3000 and go from 1 and 0, to 0 and -1. Now since 220 and 240 load are both -1... i would bump the 240 load down to -2 or -3 to make the transition smooth between all the cells.

Repeat this process down until you get down to your area that's seeing the knock, do another log, then repeat the process... then do another log... then repeat...

somewhere in there you need to eat and sleep though.

Good luck!

 

I have 2 timing maps, low and high. I have only been playing with the high. My low timing map has no resolution at that level, it jumps from 180 load to 260 load. The 4000rpm cell at 180 is -1 and 260 is -2 on the low timing map.

On both maps is it worth removing some of the lower cells and getting more resolution up high? On my high map, removing 0 and 10 and adding 210 and 230? And on the low map removing 0 and 10 and adding 200 and 220?