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Ive recently rebuilt my D15Z1 and can say that there isn't much to do on improvements of the engine for FE..
I put fresh bearings and rings with a simple hone on the bottom end. The rod bolts got replaced with ARP hardware and the cylinder head got milled .0010 for a little compression. Gas mileage cars like compression. I also polished the exhaust ports just becuase i figured it couldn't hurt. I bet most of the cars on this site could use a valve adjustment. I wish I had a picture of the carbon that was caked on my valves. And the guy I got it from said he averaged 50mpg in his VX. Kinda excited to see how the car will perform now that its all freshened up.
As far as ideas for down the road.. I really like the idea of turbo charging.. If there is turbo diesel jettas out there getting 50mpg then I know I can improve the Z1 with a very small and simple turbo setup.. A small t2 turbo that'll spool really quick and just run 3-5psi max. Don't know the complete logistics of this setup since from what I understand you can't chip the p07 5wire ECU but with the car already having wideband I wouldn't think it to be too much of an issue. 2" piping and a small factory intercooler from an eclipse or something. My ideas run wild with this stuff but I just need to get my car on the road first and work the initial bugs out of it..
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