car stumbles at 5700 new to logging please help

[sb7775]

here is the set up i have
stock motor with crowler 414 and new style lifters
new knock sensor
evo 111 ported manifold
pte34(57trim)
2g o2 ported to a full 3in exhaust
buscher front mount
sheet metal intake
2g mas screw backed out flush all honey comes still in place
255 with 680(pte) injectors and a afpr set at 44 (no vac.) afc2
egt,boost,and a logger
i'm running 18psi and at about 5700 the car seams like its cutting out.
here is some of my log and my afc settings
rpm knock timing hz 02-r
2468 0 40 94.3 .64
2656 0 32 276.7 0.00
2900 0 31 345.9 .70
3125 4 31 421.4 .78
3437 3 27 553.5 .78
3781 3 26 666.7 .78
4218 2 25 899.4 .76
4750 1 23 1182.5 .76
5312 0 22 1320.8 .76
5781 1 25 1434.1 .76
6218 0 28 1566.2 .76
well i made a tolal of 4 run they all look pretty much the same, on the outher 3 the hz went to 1603.9 but it still had .78v and 0 knock and 24 deg of timing. the car stumbles very bad at 58-6000rpm. car pull great until then it has 5 deg timing. my afc settings are
low hi
1000 -1 +8
2000 +6 +8 my hi low is 30--80
3000 +8 +8
4000 +8 +8 ftl-103
5000 +8 +8
6000 +8 +8
7000 +8 +8
the car idles great and drives great. the car makes 18psi by 3800. i'm just a little confused about my problem i was thinking i was running out of fuel now i'm thinking i need to pull the honeycomes out of the mas. i'm really not shure if its a phantom knock or a boost leak. this is my first dsm and my first logging experiance. any info would be a great help. thanx steve

 

[sb7775]

well i removed the the two side and lower honeycombes and i put a new o2 sensor in. boost is 15-16 and i had to set the afc to about +50 across the board. i took it out for a nother run even worse, it started to stumble at 4500-4700. i then lowered my base fuel pressure to 39-40psi and the car had a little stumble but it pulld to 7100 next i lowered my high settings to 35 across the board and the car pulled hard all the way to 7200. here is my log. if any body has any advice i would appreciate it. thanx steve
rpm knock tima 02-r hz
4062 0 25 .93 1018.9
4312 0 20 .95 1201.3
4781 0 19 .95 1333.4
5218 0 19 .95 1459.2
5500 1 20 .93 1566.2
5812 0 23 .93 1603.9
6187 0 25 .93 1603.9
6468 0 21 .93 1603.9
6687 0 20 .91 1603.9
6843 0 19 .91 1603.9
7125 0 17 .91 1603.9

this is the log with 40 base psi, 16 psi boost,93 octane, i still think its a little rich i think i'm going tu up the boost to 18-19psi. and my egt never go over 1450. if any body see's any problem please let me know thanx agian steve.

 

[CanadianTSi]

In your first log your o2 was dead, but it looks like you fixed that, looks alot better now.

I think a nice upgrade for you would be a 2g maf

 

[kpt4321]

He already has a 2g MAF.

First of all, put the honeycombs back in. You don't want to take them out, it makes the airflow curve very nonlinear.

What I really really REALLY don't understand are your SAFC settings. The car has 680cc/min injectors, which are more than 50% bigger than stock. They will require you to take out about 48% of your airflow on the SAFC.

However, you also have a 2g MAF. Now, assuming that you put all the honeycombs back in (which you should) then you would see about 20% less airflow than you normally would with a 1g MAF.

That means that since you originally need to take out ~48%, and the 2g MAF is taking out 20%, you still need to take out a whole lot, around 20-30%, on the SAFC.

You're set to +8%. Either you're running richer than poo, or your setup has a problem.

 

[sb7775]

i belive i have a problem i did a compression check to day and found
cylinder 1-3 have 125 and 4 has 155. i did a leak down and fould cylinder 1 and 3 were leaking 55% and 2 was 45% and 4 was 2% so i'll be pulling the head and cheacking the head gasket and checking for some cracked pistons. i did,t save the honeycombes so is there any outher way or should i just buy another one. just to let u know the car pulled very hard can't wait to get it running at 100% thanx steve