Radiator cooling ports
 

The biggest issue I face with my Tubro 1.8 build is heat, car is making good power but it also creates a lot of heat. I have SuperMiata coolant reroute and crossflow rad, running distill water with Mocool. it helped but water temp is still on the high side. After using meth injection it further cooled the intake charge and lowered the heat produced. At the end I even removed the AC so the car do not overheat anymore on track. Due to the pandemic I have more time and decided to build some custom rad shrouds and bumper air vent to better improve the air flow to the rad. it’s simple mods and it definitely improve cooling so I can step on it w/o worry.


https://cimg3.ibsrv.net/gimg/www.mia...1ff329c03.jpeg
air inlets for radiator cooling, fit on NB not sure a about NA.
https://cimg5.ibsrv.net/gimg/www.mia...67ccd845a.jpeg
16G aluminum shroud, tried to simplify the design and save weight.
https://cimg7.ibsrv.net/gimg/www.mia...62763c5fc.jpeg
Mounted using factory holes
https://cimg3.ibsrv.net/gimg/www.mia...5ae494e6b.jpeg
Needa trim the rad support a little to allow more air flow
https://cimg9.ibsrv.net/gimg/www.mia...784363946.jpeg
https://cimg3.ibsrv.net/gimg/www.mia...6c1ec0fd3.jpeg
https://cimg5.ibsrv.net/gimg/www.mia...6794fc056.jpeg
https://cimg0.ibsrv.net/gimg/www.mia...2ddd963e9.jpeg
https://cimg1.ibsrv.net/gimg/www.mia...0cb8af3a8.jpeg

What is the ducting on the side of the IC going back to the radiator like?

there are 2 aluminum plates to collect all the flow thru the IC to the rad in the back.

Super clean, nice work.

Love how this car looks. Nice job

Side ducting plates are definitely easier and look better without the A/C in place.

What is the NACA duct on the undertray feeding to?
Transmission cooling?

I'm looking at undertray NACA ducts to feed my brake cooling since the OEM foglights are used for oil cooling on the cold side and a duct to the CAI box on the hotside.

NACA duct is also 3D printed to cool down the turbo compressor (testing) I already have dedicated brake cooling and oil cooler cooling ductings.

*thank you for your appreciations, guys.

Amazing work. Im going to have to make some block off plates like your in pictures 3,4 and 5. What is your splitter material made of?

front splitter and rear diffuser is made of 4mm AlumPanel. Side splitter is being made these couple weeks.
https://cimg6.ibsrv.net/gimg/www.mia...23b2bb837.jpeg

Nice work, I like those side plates.

I thought Emilio's work on Crusher(?) showed that the rad inlet was too big, and he made it smaller. You may have bigger heat rejection requirements though.

I would be double checking that you have ALL the air passages blocked, including forward into the bumper garnish, out through the sides, and up over the top of the radiator. Basically, ensure that ALL the air entering the radiator mouth exits via the radiator. Your ducting may do that, but if so there is much not shown in those photos.

ya, I used a huge shop fan and my vape to check the air flow(pretty ghetto) all smoke seems to pass thru the IC to the rad. The 2 bumper inlets I made are very functional because they allow direct fresh air flow to the top portion of the rad. In my case with the cross flow rad, hot water flow from in front passenger top and it can be too hot to touch while the driver side is cool. Very little trimming to the rad support in order to fit them.
https://cimg9.ibsrv.net/gimg/www.mia...7f6c2bcce.jpeg

Very nice work! I need to do a little more ductwork on my own car as well.

Are those R-theory hood vents without the center vent? Looks great, exactly what I want to do!

Any reason you aren't going with a center bash bar instead of the stock large/plastic support bar?

yea, R theory hood and Leftlane fenders

cus I am in Canada, not US and the border is closed unfortunately.

Wonder what’s the weight saving from it.

Huge gains in cooling efficiency from removing bumper beam and core support as Z33Taxi suggested. At least one company now making bash bars but it looks like you have the knowledge and resources to make your own. Top of you rad core isn't getting much airflow.

OverRev, I love seeing threads like this, with thoughtful design and well-executed fab.

It's funny in a way, because it makes me think back to 15 years ago, when this forum was young, I was considerably less old, and the standards were a hell of a lot lower in general.

Back then, I (and others; you know who you are) were doing what, at the time, passed for innovative stuff which impressed people.

These days, seeing stuff like this makes me feel like a rank amateur. Largely because I stopped learning new stuff somewhere along the way.


Also, holy hell, I just noticed that you joined this forum about the same time as Emilio & I. Where the hell have you been this whole time?

ya, I built my first turbo NA like 16-17 yrs ago. Back then using E-manage and Garrett turbo. Not a lot of supports on forums at all. I sold it when I had to relocate for work, and 2.5yrs ago I decided to build another one for the 30th anniversary reunion. I went and tracked at Laguna Seca in the last 2 yrs. too bad I didn’t have time to finish the build by then, it did fairly well and it’s still an on going project. Nowadays with a lot more parts and tech available, the build is in a totally new level. Although it’s not as fast or pwrful as my other cars, it’s definitely more fun and direct. I still highly recommend others to pick up a miata for track as a inexpensive starter.

here is my old NA
https://cimg5.ibsrv.net/gimg/www.mia...6ebd02841.jpeg

interesting! I only know it’d save some weight if I replace the huge plastic rebar with a steel tube. how could that help cooling? The opening on the bumper is pretty much the size of my IC and only minimal air could flow up, unless I cut the bumper. I double checked before I decided to cut opening on both side of the emblem and made air ports to cool the radiator.

Tight build, really nice.

How do you rate the mishimoto oil cooler?

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