Looks like you have too much acceleration enrichment. In your log file, I'm seeing drops to like 11:1 AFR with slight throttle movements even though your MAP is quite low. Look at 377.5 seconds for an example. I'll bet you can back off substantially on the enrichment. That enrichment will make the HC and CO values go off the charts.
1. It looks like, in general, you haven't tuned or need to retune the low MAP regions of your VE table. This would cover both the idle region and the "decel" region. I recommend that you get out and do some serious autotuning/VE analyze logging and try to get as much run time as you can in the low MAP region (idle, mid and high RPM with throttle nearly closed).
2. The feature that turns off fuel while coasting is called "overrun cutoff." There is a dialogue called "Over Run Fuel Cut" that you tune for this. While doing your autotuning/VE analyze logging, make sure you have this turned OFF so that your VE table is actually injecting fuel for the purpose of tuning. After tuning, turn this feature ON. The various controls are in the dialogue. From looking at your logs, you seem to have about 2 to 3 seconds of delay before overrun cutoff engages. You can easily reduce that to 1 second.
Not able to open your msq for some reason, otherwise I would be more specific with overun cutoff. I can tell you that my settings are (and these were the MSPNP defaults):
Fuel Cut When (all parameters AND'ed):
RPM > 2000
kPa < 20
TPS < 150ADC (note that this value completely depends upon your TPS calibration -- so don't use mine directly)
Coolant > 160F
After 1 second.
Last edited by hornetball; 05-16-2013 at 07:46 PM.
Autotune and VE analyzer are both smart enough to recognize when AE enrichment is active and discounts those readings. It is also smart enough to recognize when overrun cutoff is active for the same reason.
The issue with leaving those features enabled is that it cuts down on the number of readings that can be used. I usually turn off overrun cutoff and leave AE alone while tuning. BTW, your original tune looked far enough out that you should make several tuning runs to get it back in shape. Don't stop until your AFR's are tracking your AFR table.
Note that the amount of AE you use should be based upon "just enough." Start with no AE and add just enough to get past any lean stumbles. With port fuel injected engines, you just don't need nearly as much as in the old Holley 4-bbl days.
Here's what I did. Based on some other threads on passing emissions, I pull 5% timing across the board below 100kpa. I pushed the AFR target table to 15 below 100kpa. Then I loaded the msq into megalog and had it to a veanalyze to rough it in, then took it out for an hour long autotune session. Finally, I got it nice and hot before the test.
I just passed with my turbo! So happy I don't have to worry about it anymore. Followed your procedure, disconnected the wastegate and set my targets for 14.7-15:1 and backed off the ignition timing a few degrees.
Check out all the codes it had! They said I passed CEL but they just didn't bother to look behind my ScanGauge lol.
I made a video too, just to show a little of what the IM240 test is like. Two-speed idle tests, what a joke.