cyclopat

Yes, I counted 19 teeth between timing marks.

Ted75zcar

iTrader: (2)

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

edited

cyclopat

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

cyclopat

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.

Ted75zcar

iTrader: (2)

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.

cyclopat

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.

Ted75zcar

iTrader: (2)

What is your VE doing there?

cyclopat

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

Ted75zcar

iTrader: (2)

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

cyclopat

I idle at 900 rpm and 20-21 in hg

Ted75zcar

iTrader: (2)

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

Ted75zcar

iTrader: (2)

Or the TBelt slack wasn't taken out properly.

cyclopat

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.

Ted75zcar

iTrader: (2)

Exhaust cam off can really show up in idle vac.