Did you re-gap the spark plugs? The boost can effectively blow out the spark. I would log a couple of runs and have the ECU tuner go over the logs to see if they can pin-point a trouble spot. Check for any leaks. Any DTCs?

 

Yes, re-gapped and changed to denso plugs.

I did use durametric to datalog and I don't see any misfires, ignition angle and lambda all looked good too.

 

have you changed your DValves

 

What kind of AFR are you running with your tune?

 

Matt, still on the stock DVs.

Bob, my lambda is about .85 to .72 depending on the rev range, it gets richer up top.

 

Here's some data logs.

Notice when I let off the throttle there's a big fluctuation of the RPM, is that because the DME can't keep up at that point?