Car has been taken down to Kyle at DDS Performance for the wiring and cooling stuff I needed help with. Let’s start with the wiring!
There is ton’s of places out there that do custom ls harness work. All I did know is that I needed to stay away from the PAINFUL stuff.. I wanted a basic stand alone custom harness unloomed and cheap! Kyles would be going over it all and removing a few things and tucking things where he likes them. We are still maintaining the easy approach to keep things simple and serviceable. so after doing some looking around for the harness I came upon Sand and Street Performance out of Arizona. I made a simple call and got the owner himself on the phone. He does everything himself and knows everything there is to know about it. Told him what I needed and he was all about it. So talk a bit further and now SSP WIRING is a sponsor for the car! I sent the ecu down just to make sure everything was still solid from before. He can do custom tuning, remove the vats, also live tests everything he does to Guarantee the quality. 3 days later I had my all new custom harness! Props to them for the quik service and a super rad harness! Go check em out, cheapest I could find out there and super willing to work with you on whatever special requests you may need!
Kyle started with making out main electrical panel shown below. Easy to get to and has all the relays and a spare in case of an issue for a quick fix.

Wiring was ran along the passenger side rail. Things were split into “to” power and “from” power and “signals” so we could get and figure quikly.

Goes along the rail up the the kill switch and power block. And of course meets up with the ecu which will sit on the tunnel there along with the obd2 port for easy plugin and checking of the system. Custom waterjet plate cuz for the switches Kyle made.
Super rad connector Kyle made to pass the coolant and wiring through the firewall without buying expensive mill spec bulkhead connectors.

Ok that is most of that. Huge Thanks to Kyle from DDS Performance and from SSP Wiring for the hookup and a solid product!
Moving onto the coolant aspect of the build. Now I have never heard of a Miata with a rear mounted radiator so this was a “let’s give it a try” effort in the quest to get the weight balance alot closer to perfect then the horrid old setup. I am running a typical electrical water pump from Mezeire. Bolts onto the stock location, has better pumping( no cavitation at high rpms, works while motor is off, ect) along with the way better looks and the ability to the run the short belt for just the alternator! CLEAN! Kyle welded up a bunch of pie cuts from the 1 3/8″ piping I got local. We made a few hose joints so the system can be removed from the car if ever need.
The radiator is a dual pass Howe unit from local race shop. I ran this setup with the old motor and never had heating issues. I wanted to keep it that way and its overkill size brings some weight to the back to helpout! This is almost 4 gallons of coolant in the system! Kyle weldedthe outlets a bit to get where we needed them.

We started to figure out what was going to work and how we were going to fill and bleed the huge system. Thought about a tank up front and a fill in the rear as well.. Doing some measurements we decided the rear was still a good amount higher in the car and we could eliminate any system in the engine bay helping with weight and the clean look we wanted. Kyle started working on a custom fill/over expansion tank in the back only! Clean!

Engine bay all clean! You can sneak a peek here at the cusom mounted s14 sway bar

Here is the rear of the car all finished. The quest for killer cooling was found awhile back when searched what was the baddest fan out there. Ford Taurus 2 speed fan from any 3,8 motor setup which are cheap from a junkyard or not to crazy new. They flow over 4000 cfm and are oem reliability!
I went the next best step and heard about the Lincoln Mark VIII fans found on the v8 cars. 2 speed 1″ bigger to a 18″ fan and a capacity of 4500-4800 cfm depending on the actual fan. Mine was a full new unit I think I paid $180 bucks. This thing yanks air!


Fill the car from the rear tank here turn the waterpump on and Bam all bled!