Turbo upgrade before I'm old and gray - 1995 M Edition

Houleo — Wed, 22 Apr 2026 18:38:43 GMT

Decided to post my project to get some help/feedback and give you guy's another noob to laugh at maybe. The original plan was to add FI to my 1993 Mariner Blue project, but it has been dragging on due to home upkeep, “emergency” projects, and cold weather in upstate NY keeping me from working in my un-insulated shop.

Tired of waiting to experience FI life I decided to upgrade my 1995 M Edition, at first I wanted to keep it “original”, but the previous owner had made some changes, including a loud/boomy dual exhaust, interior appearance package (stick on pearl stuff along doors and center console, and aftermarket stereo with amp located behind the drivers seat). The amp was removed immediately and a slim one was located in the package tunnel behind the spare donut and eventual replaced the exhaust with something much quieter without rasp. After reading a ton of posts on MT and other forums I got the bug and started doing more less invasive upgrades, Tecna coil-overs, Flowforce MSPNP2 (micro PNP?), long tube headers and gutted the MAF leaving only the AIT. I managed to get the idle tuned and used autotune for the rest of the VE table, overall the butt dyno noticed a difference from the as purchased state. I got involved with the Nutmeg Miata Club in CT, attended several tech days and their autox day at LRP and had a blast.

Goals are ~200WHP on the stock internals and reliability for street and some autox. Learn how to tune FI.

another BP rebuild

Stoffl — Fri, 17 Apr 2026 06:36:25 GMT

So since my 2022/23 NA BP rebuild has completely **** the bed and also killed my cat cams camshafts in the process it's time for (another) NA VVT rebuild. No point in going for another NA BP rebuild.
Straight up consumed a quart per 1000km oil after run in cycle, at the end after 3 years and 30.000km more like 3-4 quarts per 1000km. Assumption is that either engine builder or machine shop fucked up, some debris remained in the engine. Upon the recent disassembly we found scored cam shaft lobes, lifters, cylinder head contact surfaces front and rear. And it all went downhill from there. Cylinder walls fucked, crank shaft surface and bearings fucked, boundary oil pump scored, and so forth...

Luckily the 12:1 85mm W�ssner pistons survived so at least those will get another run. Yay!

So here some initial pics of the carnage

Cat Cams camshafts

Cylinder wall - others also have lots of vertical scoring marks

fucked crank bearing

scored crank

Boundary stage 2 pump opened up

front plate scored

pump wheel scored

bore pressure relieve valve

piston pressure relieve valve

The oil pump should be fine though, I'll smooth the bore a bit at the bottom and I bought a new pressure relieve valve piston and spring from Mazda.

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Turbo upgrade before I'm old and gray - 1995 M Edition

another BP rebuild