Koyo Radiator install

As some of you know we have been using a Koyo aluminum radiator for the past couple months. We've now put 6,000 miles on the car, ran a couple atuoX events and now has a track day with this radiator.  We absolutely love it! The car performed awesome over this past weekend at Auto Club Speedway in Fontana, CA.  Temperatures were over 105 and the temp didn't go up at all. We did 4 sessions at 20 minutes at a time. A lot of you have asked how was the install on it and can it be done at home. It absolutely can be done at home with regular tools. We put together a install guide in case you needed some help installing the Koyo Radiator. Visit http://www.koyorad.com/ for more info



Koyo Radiator replacement guide for 2006-2015 Mazda Miata

In this article, we will be detailing the process to install your brand new Koyo radiator into your 2006-2015 Mazda Miata. This install was done on a 2014 Miata Club Edition, but everything in the engine bay as far as the cooling system will remain the same between the years. From this point on, we will refer to the car by its chassis code: NC.

This install is fairly complex, as you have to remove basically everything from the battery forwards. It is highly recommended, that if you want to upgrade your headlights to a retrofitted system (or add HID bulbs), change your intake to a cold air system, update your front bumper, upgrade fans, etc. do it all at the same time. This is suggested because many components that you would need to remove for the installation of the above mentioned parts, are removed during this time for example: intake, splash guards, battery, radiator, fans.
Tools Required:

  • 10mm socket and ratchet
  • 10mm wrench
  • Various extensions
  • Flat head screw driver
  • Pliers (various sizes helps)
  • 12mm socket
  • Coolant
  • Phillips screwdriver

Time allotment
Please allow for approximately 6-8 hours to do this installation. This isn’t your typical radiator swap. The packaging of this car does not allow for an easy install. Also, it would be best to have a friend help you on some steps.





This installation was performed at the Garage Star HQ in Sacramento, CA on the Garage Star NC3 Club Edition.  We used a lift to perform this install, however it can be done on jack stands.  When using a lift, jack stands, power tools etc, please take the proper safety precautions. Please dispose of your coolant and oil in the proper manner.



NOTE: This install is best done when the car is cooled down. No one likes to work on a hot car, and no one likes hot coolant in their faces. This is a long install, grab some drinks, food, listen to music but most importantly – take your time, and be patient.

Step 1:


Jack up the car: Take extra precautions when jacking up your car to ensure it will not slip off the stands.


Step 2:



Begin to remove the splash shields. There are a total of 3- 2 in the wheel well and one under the engine. The front of the splash guard is held in by phillips head screws, and the rest of the paneling is held in by fasteners which can be removed using a flat head screwdriver. The rear and wheel wells do have 10mm bolts holding them in.




You will need a 10mm socket and extension to reach this 10mm bolt holding in the wheel well splash guards.

Step 3:



The drain bolt is located in the front of the radiator, drivers side. It can be taken out with a phillips head screw driver, take caution to not strip this drain plug.




Place something under the drain plug to catch the coolant coming out. Once you position your pan, you can remove the radiator cap to help coolant drain quicker.  




  • Never open the radiator cap if the car has just been on, the system is pressurized and can cause harm to you or others.
  • Dispose of all coolant in the proper manner determined by your city, county or state.

Step 4:



The fun begins now. Remove the coolant hose from the top of the battery cover, as well as the battery cover.


Please Note:

Being organized now, will save you hassle in the long run.



Remove the bolts holding in the intake box.  There is one phillips head/10mm bolt on the intake arm (green arrow), and 2 bolts on the intake box holding it to the chassis (blue arrow). Use a flat head screwdriver to unclip the MAF sensor.

Remove the air box, and filter.




Here you will want to use a flat head screwdriver to remove the plug for the MAF sensor.





This fastener for the bottom of the air box is a bit tricky. If you are standing at the front of the car, pull it towards you. It’s a rubber grommet that holds it secure. It may be stuck and will take some persuasion to get it to release. Don’t spray a lubricant on it to coax it free, your ecu is below.



This is what it looks like once removed.

Step 6:


Next we will remove the water reservoir. There are 3 coolant hoses connected to it as well as a few 10mm nuts . Use a pair of pliers to remove the hose clamps and if necessary, grip the hose with the clamps and wiggle the hose free.






Step 7:


Undo the battery, remove the tie downs, negative and positive wires. Once the battery is removed, remove the 10mm bolts holding the tray in. You will want to also remove the bolt holding down the power steering reservoir.




Step 8:



Now lets remove the ecu. There are 4 bolts holding in the ecu cover. Remove those.




Press the clip down (blue arrow) and then swing the white arm back and you will have the cable disconnected. Remove the ecu and black paneling under it.



Unplug the fan, and separate the coolant hoses from the fan shroud.



Step 10:



We will now remove the AC and PS components which attach themselves to the radiator. Remember -  take your time, you don’t want to damage your PS or AC lines. You may want a friend to help hold parts up while they dangle.
The AC condenser and lines attach at the front and sides of the radiator and can easily be removed using 10mm wrenches and ratchets.



The upper radiator stays are this l shaped bracket. 2 10mm nuts hold them in. Then remove the lower radiator stays, those are held in by 12mm bolts.

Step 11:




Now its time to install your Koyo Radiator in. We put the radiator in without mounting the fan first.

Transfer the rubber feet from the OEM radiator to the Koyo radiator, and reattach mounting points and AC lines. You will need a friend to help.  




Koyo uses the OEM rubber mountings for the lower radiator stay.




Take your time when reinstalling your AC components.



Now you’re ready to install the fan. Simply slide it back into place, Koyo’s radiator has areas for the stock fan mounting brackets.  


Step 12:

Simply follow these instructions in reverse to reinstall everything, battery, air box, ecu etc. You can then begin to bleed the coolant.


Step 13:

Enjoy your new Koyo Radiator!

Garage Star Delrin door Bushings

Replace your old worn rubber bushings with Garage Star delrin door bushings. The Garage Star door bushings will help with chassis rigidity.




Drove the car today with the GarageStar door bushings and I have to say, these things are great!

One of the most immediate things I noticed with these was something I didn’t even have to drive the car to see; audio quality was massively improved with these. The stock 10AE Bose system doesn’t sound terrible anymore! Bass and mids are much cleaner and the bass hits are a lot punchier than before. Night and day difference in regards to that.

As far as drivability goes, I probably noticed the benefits of these the most while going over bumps and highway joints in the road. The doors definitely don’t move at all. These make that signature Miata wiggle and clunking sound virtually disappear over harsh bumps.

As far as NVH:

Noise: Quite the opposite of what I was expecting; a very noticeable reduction in noise overall. Mostly noticeable when going over bumps.
Vibration: Little to no additional vibration from what I could tell. My car is pretty well braced, so your mileage may vary here depending on what level of bracing is installed in your car.
Harshness: Little to no additional harshness. Yet again, this may vary depending on what you have installed in your car.
One thing I will say: these bushings are great for keeping your doors where they need to be while driving, but they are not a replacement for door bars or frame rails by any means. Not really sure where people were getting that idea to begin with, but for what they are, they do their job fantastically well.

Well done Ken!



Installed GarageStar’s new Delrin door bushings today. 4 Phillips screws and a quick test drive later, I’m pretty impressed.

They eliminated most(not all) of my “65mph shimmy” and make the car feel totally solid.

Tested with hardtop installed, bone stock 99 NB with 192k miles. NBs are significantly stiffer than NAs from the get go so I was surprised how effective these little pieces of plastic are.

In the grand scheme of chassis stiffeners, these are pennies compared to all the other options and more effective than all the shock tower bars, Cannon Braces and lower control arm tie bars I’ve ever tried.

Hit up Garage Star to get yours.

Dan Howard


I just installed these today on my NB1 daily driver, and I couldn’t be more impressed! Cabin noise is greatly reduced over rough terrain, my car no longer creaks when entering a driveway (I could literally watch my door gap separate prior), and I can affirm that the audio quality has improved with my BOSE/Clearwater setup – much less vibration with lower frequencies. The doors now close with an affirmative clunk that is reminiscent of higher dollar luxury cars.I also test fit them on a few other NA/NB prior to my final install, no need for sanding or modification. If you are experiencing any issues, it is likely that your steel cup has been damaged or bent in your car’s lifetime. Like mentioned earlier, hand tighten to snug, close the door a few times, and cinch it down.Absolutely worth every penny. Hands down one of the best dollar for dollar modifications available for our cars.Great work Ken!!
Black Box Motorsport
Read Adam's review and install guide in the link below.



click the link below to purchase


Garage Star 1.75 " Delrin shift knobs!

A bunch of customers requested we make a black spherical shift knob  so here they are! https://garagestar.com/?product=garage-star-black-delrin-shift-knob







Garage Star Minimalist Center Console

Finished our new minimalist center console. I made this to give another option to the shorty console we already make. The console fit rover the factory rubber boot, ebrake lever and rear trunk/gas lever. It's held into place by Velcro to the factory carpet. As of right now we have black available but also plan to make it in tan and red LE. I'm also working on a tombstone cap that will be available in the near future.


Price is $150 with free shipping within the US. $180 shipped International

Click the link to purchase. https://garagestar.com/shop/minimalist_center_console.html

If you have any questions feel free to email or call. Email is on the contacts page


RS Active headlight shrouds in Carbon

For all you RS Active owners out there I'm planning to make a LIMITED run of carbon headlight shrouds. I know some of the RS Actives floating around didn't come with it when you bought them used. This will be a VERY LIMITED run since I don't know many people that have them. I'll know pricing in a week or less but just wanted to put it out there to see if you guys would be interested. Shrouds fit Type I and Type II RS Active lights

If you are interested shoot me a email. Email is on the contacts page.

NorCal's 1st Annual Roadster BBQ

For the past few years some of the local Roadsters community has been asking to throw a BBQ.  Well here it is! Mark your calendars and tell your friends!

Hamburgers, Hot dogs and drinks will be provided by Garage Star.  Keep checking the Garage Star website, Facebook and Instagram for updates. #garagestareats =)

When - Saturday April 12, 2014
Where - Treasure Island
Time - 10AM-6PM



Redesigned rear tow hook

Here is the redesign of the rear tow hook. This is a photo of the raw version. They will come powder coated. Also stainless tow hook will be discontinued when we are out of stock. On have 3 sets of front and rear stainless tow hooks left.




Garage Star NA & NB Miata top hats coming soon.

Garage Star NA & NB Miata top hats will come in various height options. 1" and 2" top hat heights. Will fit most of the coilovers on the market. These top hats are in raw form but will come powder coated black.

Pre-order price for a pair of top hats (2 top hats) any size. No additional cost for shipping on one additional pair.

$90 shipped

$143 Shipped international

MSRP for a pair of top hats. No additional cost for shipping on one additional pair.

$110 a pair shipped within the US

$163 a pair shipped international


Email us if you are interested using the contacts page. https://garagestar.com/contact/


1" NA & NB Miata top hats

2" NA & NB Miata top hats