oil cooler is well built and it brought the engine oil temp down ~ 5 deg C with that under tray and the opening is feeding air to the cooler. Mishimoto parts are well built these days. They use 3D scanner to scan vehicle and track test their performance parts. I also have their oil cooler, intercooler and catch can on my FK8 Type R.

Thanks, I've been considering one for my turbo build. I have one of their radiators already, and also used one on my FD.

You need to go find some more threads on ducting and look at the pictures. I think that is ultimately the problem. While you think you have yours done well, I am betting the IC is actually killing a ton of airflow to the radiator. You need fresh air that goes above the IC, and straight into the radiator. I think that is not happening and causing your problems.

Removing the plastic stuff and installing a radiator support bar clears up a ton of room for proper ducting.

Here is an example of what I've done with one of @matrussell122 bars and removing the structure between the frame rails. I'll likely block off some area of the radiator opening because the opening on the Racing Beat bumper is huge. The pictures aren't if the finished product. Gaps will be taken up by bulb seals, closed cell foam, and HVAC tape.

https://www.miataturbo.net/build-thr...6/#post1578044

Track tested yesterday ambient temp ~80F (27C). Water temp was stable ~210F (distill water with Mocool) and oil temp is stable at ~230F (300V 5W40 ). Tried it without running meth and didnt turn on the heat. Temp is stable throughout the day so no complain at all. although I cannot scientifically isolate and prove the benefits of each cool mod, but the combination on my 3D printed air ducts, shrounds, and hood louvers solved the overheating issue indeed.

*Couple members pm'ed me about the 3D printed air ducts, yes they should fit both NA and NB miata and I'd sell and ship them for $80USD.

Previous cooling mods include: Qmax coolant reroute with custom aluminum coolant piping, SuperMiata crossflow rad, Mishimoto oil cooler, A/C removed.


https://cimg9.ibsrv.net/gimg/www.mia...157f5db1b.jpeg
https://cimg5.ibsrv.net/gimg/www.mia...7ec7fdbf3.jpeg
https://cimg7.ibsrv.net/gimg/www.mia...957b99722.jpeg
https://cimg8.ibsrv.net/gimg/www.mia...2a73d4240.jpeg

I really like the cooling duct design. I would be interested in a set indeed, if you are still up for making them for others, OverRev!

This is a bit of a hijack, but I'd like to discuss the bumper support cut concept in terms of stiffness and safety. We do so much else to these cars to stiffen them, it seems like trading the front bumper system for a bolt on bar could reduce stiffness. And knowing that Mazda engineers put a lot of work into crash safety I worry that the bumper support delete creates a situation that could respond quite differently. I am thinking about on track, wheel to wheel crashes, in this regard, not street car safety. Unfortunately, I have traded paint in the past, so know it happens. I have pounded the front horns of my RX7 straighter more than a few times.

Knowing how many of you have used the bumper support delete bar, I imagine I will be learning more from you on this.

yes, I can print any of my design anytime if you want a set just PM me.

The factory rebar and bumper support are heavy. I may replace it but I worry about the bumper fitment without the support.

Beautiful build!
Your car looks pretty much like my dreams for my car are.
Sorry, I'm gonna copy a bunch of what you've done.

The NACA duct for the turbo is one of them!
How has that worked?
I'd want to take temps at CHRA with the duct functional and not.
I'm guessing a 100 degree F reduction above 40mph.
I was going to use a tiny scoop but if a NACA duct will work it is a FAR superior solution for this.

Is the rear splitter curved? It looks like it is.
Did it add downforce? It looks like it should.
Will you share the profile? PLEASE say yes...
Or better yet, will you build one for others?
I have multiple big sheets of brand new 1/8" aluminum already and can form it myself but it would be might be easier/better/quicker to just pay you.
Others might want it as well.
It looks BAD ASSED!

I need rear down force to match a mild splitter on a street car.
I would prefer to not have a big wing because of this.

When I PM you for the hood vents I'm going to be interested in the little NACA duct as well...

Stunningly executed!
I hope I can match what you have done.

Thank you for your kind words. The rear diffuser is now improved along with some improvements on front splitter:

https://www.miataturbo.net/aerodynam...ffuser-103880/

I would love to share the profile but unfortunately I tossed away all the cardboard templates. You may wanna check out R-theory they have some pretty cool diffuser designs. I made mine because I want one that clears my custom exhaust and mounted at the right height.

I tested it with wool strings and the flow pattern is pretty good. So I assume it functions just don’t know how well.

Did you have to modify your NRG panel? Mine doesn't fit for crap or did you adjust your radiator bracket so the SM radiator is more vertical?

It fits fairly well. I think I had to sand it down a little around the latch, that’s all.

Im having the same classic cooling issues, your Car looks amazing btw.. would you consider sharing the STL file for those vents? lite_rider@hotmail.com

Strut brace
 

What front strut brace are you using for this set up. I’ve been looking for one to get around the coils as well