Yes, I counted 19 teeth between timing marks.

You can have 19 and still be off. Confirm cam/crank timing at TDC.

edited

I'll look into that as it seems like the best theory so far.

Ted, are you saying that the cams may be out of alignment with the crank? I checked the crank and cam timing marks when I had it apart and they all line up at tdc.

Yeah, it can be pretty easy to get a cam gear off by 1 tooth. A screenshot with WOT starting earlier in the RPM band might be helpful too.

Here's a screenshot with wider RPM band WOT from 2700 to 6200. The logs look like this every time. Start at about 5 psi, up to nearly 8 midrange, then down to 5.5 up top.
https://cimg7.ibsrv.net/gimg/www.mia...6bba789c2a.jpg

What is your VE doing there?

Here you go. Added VE to the top plot in yellow

https://cimg5.ibsrv.net/gimg/www.mia...b67222dd99.jpg

Yeah, see how it dips? Miata motors are not supposed to do that. That should be the torque peak range. Your engine is consuming less air there than it should, which is why you have higher manifold pressure. Basically, manifold pressure is equal to the supercharger output volume divided by the engine intake volume. When the engine intake volume decreases, the manifold pressure increases. What is your idle map reading?

edit: and idle RPM

I idle at 900 rpm and 20-21 in hg

My guess is that your intake cam is retarded by 1 tooth.

Or the TBelt slack wasn't taken out properly.

Thanks for the help. I'll definitely look into that. So what does the idle value tell you? I'm curious how that plays into this.

Exhaust cam off can really show up in idle vac.