Misfire on slow acceleration

[Trump]

I have my multi TB set up with MS3X running well except for a slow acceleration issue. This is a problem I did not recognize with the single TB set up I had prior to the upgrade. It may be that the plenum muffled the noise but I do not think so. It was semi sequential but now fully sequential. The injectors are now about 100mm further upstream of the valves.

When accelerating slowly ( TPS not MPH) I get a cough back through the intakes. The engine does not seem to hesitate, it is just one or two coughs then all is OK. I tried to adjust the AE ( I am using the Acc-pump option) but reluctant to get to low to avoid any TPS noise.

Any suggestions?

[Matt Cramer]

I will need a data log in addition to the MSQ to be able to determine what is going on.

[Trump]

Thanks. Will get one and send.

[Trump]

Sorry for delay on this. The real world caught up with me.

Attached find a log (Shadow Dash).

I have fitted a new cold air box and it makes it harder to hear the miss.

[slow_hemi6]

If you are accelerating slowly then you do not really need AE kicking in. It's probably the problem rather than the solution.

[Trump]

Yes, one would think so but the msq is set to give no extra fuel. That is my issue, why the misfire?

[slow_hemi6]

How's the datalog coming along? That should show what is or is not happening.

[Trump]

I posted one a couple of post ago.
It was a Shadow Dash one and I am not sure it will have enough detail. Do I need to take one with my lap top?