So a hiccup……
Following this guide to change the injectors: DIY Replacing Fuel Injectors on NC Miata - MX-5 Miata Forum
Remanufactured RX8 450cc injector in yellow and standard OE injector in black.
Whilst they look similar the plugs are different.
Does anyone know a link to a place that sells adapters/ replacement pigtails?
So whilst hunting for a seller for some RX8 Denso connector to Mazda injector plugs I thought I would finish the 3 Bar MAP sensor wiring.
I unplugged the MAP sensor connector from the back of the Inlet Manifold.
I cut the plug off.
This gives me 3 wires from the car loom to match to the 3 wires on the new plug that connects to the new MAP sensor.
Wire - 1 - Red/White
Wire - 2 - Black
Wire - 3 - Red
I only used Red and black wires, using tipex to identify the ‘other’ Red.
So now I know I need to connect:
My Red/white to the cars yellow/green
My black to the cars Blue
My Red to the cars Yellow/Blue
First I need this:
So:
The IAT is wired in and working
The MAP is wired in and working
The Window Washer is wired in and working
The Boost Solenoid is wired in (untested) but I am going to start on the turbos wastegate pressure anyway until any kinks/leaks are ironed out (as there will be some!)
The only thing left to do for the mapping to begin is now the bigger injectors. They are ready to come in but I need to find an adapter to go from the stock Mazda connector:
To the new Denso style connector…. I want a pre-made solution as I don’t want to cut/solder new pigtails onto the old loom.
From a wiring perspective everything is still in place if I ever wanted to convert back to an N/A engine in the future with some simple re-soldering of 5 wires.
Its Saturday - anything I order wont be here until next week. So I thought blow it I might as well get some direct fit Injectors and not have to mess with adapters and wiring.
So have ordered some of these:
I am awaiting parts - Injectors and a 0.5bar wastegate actuator as I think the actuator on the turbo is actually 14psi which is too much for this project.
So I have been compiling this while i still remember everything in detail:
Looks like you haven’t chosen to relocate the washer reservoir into the windscreen scuttle, a la Dave Fab. Is that something you’re planning to do, or have ruled out?
I was able to just keep it inside the engine bay and have mounted it on the bulkhead by the cooling pipes, you can just see it in the pic below. I don’t plan to move it now unless I need to.
Nicely done. Adding a turbski into an already fairly busy engine bay tends to leave things a bit cramped, so you’ve done well to find a good spot for it. 
So shout to Bofi Racing for getting me some injectors super fast - and for the phone advice on how to fit the adapter hats properly.
Installed within 15mins
So car starts and idles although it lumpy of course. 1 final job is to connect a hose from the map sensor to the intake plenum - when I can find somewhere to do that from 
Basically only needs the wastegate actuator changing for a 0.5bar one (coming vie eBay) and then we can begin mapping it.
Been a long journey - kind of fun, kind of stressful but I feel like it will be worth it……maybe.
Idle sorted…. She is ready for mapping, no leaks still.
Hi I’ve been following your build, thank you Really good detailed progress.
Just looking back at your thread and I am right in thinking you managed the battery relocation without the need for say the TDR relocation kit?
I’m probably over thinking things as per usual but would like to free up a bit of space for my turbo to ‘breath’ a bit better.
Thanks again kev.
Correct, I had to buy a smaller battery but it fits re-using the standard tray bolted along the chassis leg. The standard positive and negative cables also fit without modification.
That said you do need to relocate the position the earth lead bolts into the chassis but luckily there is a spare 10mm hole well positions on the drivers side inner wing.
So no cutting of wires or additional materials required at all.
I’d be tempted to use an Odyssey race battery if I do mine…
They do look good but expensive to purchase. My plan was to get it running safely at low boost for a relatively low cost.
I have been really surprised at the quality of some of the parts though - way better than years ago.
Top man, thanks again.
That’s a done deal then, right now to start battering my head looking for a battery!
Back from holiday yesterday - bumpy landing but not bad really in the grand scheme of things.
Brough the car up to full temp this morning, a small leak of some kind appears to have started around the turbo area. I am going to take the heat blanket off it later when its cooled down to see if I can identify its source. It seems like steam and doesn’t smell like oil so i suspect one of the water feeds needs an extra turn with the spanner.
I have changed the source of the feed to the map sensor and it now reads better and the 0.5 bar wastegate arrived while I was on holiday.
And here is the new wastegate actuator fitted:
I also started looking at the boost control solenoid position, cable tied in place whilst I do some tests and the car is being mapped on wastegate pressure only to begin with.
Great work as per! How are you getting on with the mapping?
I’ve actually just spotted these on ebay:
A full turbo kit with intercooler for $845! That’s insanely cheap (although they want $800 for shipping!! 
). It looks like ridiculously cheap components too, but a cheap way to have some fun!
This was the second one:
Comes to about $2800 shipped and the manifold with it looks very nice especially!
I’d be interested to know if knowing what you know now from putting yours together, whether you’d do the same again or would you actually consider one of the linked kits? Also cheers for sending the guide over 
Mapping is OK - I was a donut and forgot to save the calibration where I had re-scaled the IAT and the MAP sensors ! I only realised when we couldn’t get it to idle properly again on the 660cc injectors without daft numbers in the base VE table!
I would have just bought a pre-made kit and given it a shot. The only reason I bought the parts separately is I couldn’t find a kit like that available at the time. The quality of some parts may not be ideal but I would upgrade them selectively when they failed - if they didn’t fail I probably would not have worried about them.
But I have enjoyed my process - which is more than half the fun in owning the mx5 for me.
Currently dealing with annoying leak on one of the turbo oil lines - but that’s just down to me rushing something rather than my parts being faulty.
Turbo conversion is now driving and feels good. Haven’t lent too far into boost yet until we make more progress on the mapping but boy does it feel lively
It starts and idles smoothly, drives smoothly and seems to not be leaking fluids anymore. So this main part of the project is complete.
