I am looking for some input for the best bang for the buck with my 1990 Miata, I come from the FWD turbo camp so I am not sure what the best route would be.
The car is a 1990 N/A Miata 1.6L stick car with 220K miles and a worn out engine (low compression cylinder #1) that still drives ok, the brake and suspension are well sorted and need no real work. The car is only driven in nice weather (parked inside most of the time) and is not my DD and used for Auto-X and track days, and the car has almost zero rust.
So with the car needing an engine/ overhaul I got to thinking, more power? Don't mind if I do. But how?
A few weeks ago my co-worker crunched his 1999 NB (1.8 stick) with about 200K miles on the factory engine, unopened. The powertrain survived without any issues. I picked (drove it onto the trailer) the car up cheap as he knew about my issue and decided to give me first crack at it.
So, now the question is how best to proceed? I have a few ideals that I would like some input on.
A few things before we get to far, no forced induction, no emission, I can get race fuel at the local Sunoco station, I am fine with spending money on this project, maybe 200 HP, I have lots of skills, tools and work space. Last thing is I would like a driving car by Spring of next year so this could be done in steps.
A) Drop (reseal) the 1.8L in and use the factory ECU.
Cheap and the fastest.
B) Re-build the engine using factory spec parts.
More time and money but should be easy.
C) Re-build and raise compression.
This would cost more.
This is the part where I am not sure about.
D) Stand alone ECU? How much real power by brand or do they all have the same limits? I am sure I would need this for the high compression option.
E) Individual throttle bodies, they sound great (pipe dream). How much real power?
F) Ported head, now or later? I was thinking after the bottom end is sorted, maybe next season.
Since this is just a working ideal I am interested in hearing from the hive on this project.
Thanks Clay