rusefi.com

Hello from RTP, North Carolina. I’m looking forward to a Frankenso project for a 92 Miata. Occasional autocross toy.

Hi!

Thanks for the pictures and welcome to this (still fairly exclusive) club of rusefi-istas. 92 Miata should be about as easy a project as can be. The standard setup for your engine is worked out pretty well and the standard maps should have you driving in no time.

A few questions:
- Are you running AC? Setting that up is still a bit funky, but doable
- You are not afraid to do some light soldering on the main board?
- Planning any mods to the engine?
- How did you hear about rusefi?

More pictures, especially of the car in action, please!

guys, looking at you, I felt like getting a similar toy
so far, I only have a dashboard

stefanst wrote: ↑

Thu Aug 23, 2018 7:01 pm

A few questions:
- Are you running AC? Setting that up is still a bit funky, but doable

That's a loaded question. My car has an AC compressor hooked up and even blows a little "cool" but I don't use it. It causes drivability issues with the stock ecu and I don't commute or try to live with this car day to day. So the weather is usually nice, top down kind of stuff and I don't mind being out in the sun on hot days. I may try to resolve the issues before the swap and then see if I can get it set up but it's not a deal breaker for me

stefanst wrote: ↑

Thu Aug 23, 2018 7:01 pm

- You are not afraid to do some light soldering on the main board?

I don't mind soldering

stefanst wrote: ↑

Thu Aug 23, 2018 7:01 pm

- Planning any mods to the engine?

I removed a K&N filter and went back to the stock airbox setup when I got the car. It does have a long tube header (unknown brand) but I don't plan on any other mods. Possibly an Air Flow Meter delete

stefanst wrote: ↑

Thu Aug 23, 2018 7:01 pm

- How did you hear about rusefi?

An old fashioned Google search for diy datalogger options that would work with an older OBD1 car led me down some interesting rabbit holes. The diy ecu in a Denso case really appeals to me and I have good access to junkyards

That should be a no-brainer for you then. Are you planning on getting a pre-soldered one (my personal preference) or are you an SMD-champion who wants to populate the board himself?

for the sake of getting up and running I’m looking into getting a pre-populated board for use with my own junkyard case and wiring I crimp on the bench with a mix of new and used parts. I’m still searching around the forums for ideas and such...

of interest is the ability to rerouting single wires within a given connector:
https://www.tindie.com/products/russian/harness-breakout-pcb/

Is this pcb being used regularly by anyone?

NA Miata is pretty much plug and play. You just solder the standard 64 pin connector to the board. All the jumper-ing is done on the board. Then you just plug in the stock ECU connectors from the harness.
There are two things you may want to do right away though: Install a Wideband O2 sensor- tuning without one's a pain and install a MAP sensor. An Ebay knockoff from a GM 3bar sensor seems to work just fine. They usually get hacked into the AFM harness instead of the AFM.

Stefan says that he wants to improve https://rusefi.com/wiki/index.php?title=Manual:Hardware:Mazda_PnP

TODO: find a source of 48 pin connector and create "Frankenso 48 pin" PCB which would be a direct drop into a 48 pin Denso case.

https://www.mouser.com/ProductDetail/TE-Connectivity-AMP/174917-6?qs=7lUI3dtMLl2Jl4sNx8kZBg%3D%3D&gclid=Cj0KCQjwk_TbBRDsARIsAALJSOaSWajhNAO15232y5iKK48jsHm_Rp_gihD46JvGzdR13UxJe4z1lI0aAu__EALw_wcB

Thanks for doing the research on this. However, I think, this idea has been abandoned a few board-generations back and we should purge it from the Wiki immediately and decisively. The 64 pin connector works for all the cars that the 48 pin connector works for and then some. Cases are cheap and plentiful, so there's really not much of a reason to go 48 pin....

See also https://rusefi.com/wiki/index.php?title=Hardware:OEM_connectors#48_pin

excellent resource. Thank you