MISHIMOTO MMRT-MUS-15E
MISHIMOTO MMRT-MUS-15E
MISHIMOTO MMRT-MUS-15E
MISHIMOTO MMRT-MUS-15E
MISHIMOTO MMRT-MUS-15E
MISHIMOTO MMRT-MUS-15E
MISHIMOTO MMRT-MUS-15E
MISHIMOTO MMRT-MUS-15E
MISHIMOTO MMRT-MUS-15E
MISHIMOTO MMRT-MUS-15E
MISHIMOTO MMRT-MUS-15E
MISHIMOTO MMRT-MUS-15E

MMRT-MUS-15E

Mishimoto® (15-23) Mustang S550 Aluminum Coolant Expansion Tank

Regular price$204.95
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Compatible: (2.3L/3.7L/5.0L)

2015 - 2023 Ford Mustang EcoBoost

2015 - 2017 Ford Mustang V6

2015 - 2023 Ford Mustang GT

 

After a few hot and cold cycles, Mishimoto recommends checking the sight glass on the side of the expansion tank to confirm proper coolant level.

 

Add some additional reliability and engine bay styling with the Mishimoto V6, V8, and EcoBoost Mustang expansion tank. The Mishimoto Mustang expansion tank has internal baffles to prevent coolant starvation from overflow ports to engine. Also, during high speed cornering, braking, and acceleration, the internal baffled reduce coolant sloshing. The engineers at Mishimoto have also included a sight glass to allow for proper hot and cold coolant levels. The stock coolant Mustang expansion tanks is major eye sore in the engine bay, so the Mishimoto tank is offered in polished or anodized black to keep your Mustang looking great. As an added feature, you can install your tank in under one hour! This Mustang expansion tank was designed to work with the stock expansion tank cap and includes an overflow nipple on the fill neck for adding an additional coolant tank so your Mustang is NHRA legal. Plastic expansion tanks are prone to failure after years of constant temperature variations, so the Mishimoto tank is constructed from durable, TIG-welded aluminum for optimal durability and longevity. The Mishimoto V6, V8, and EcoBoost Mustang expansion tank is engineered for perfect fitment in 2015 Mustang, and as with all our 2015 Mustang parts, this expansion tank includes the Mishimoto Lifetime Warranty.

  • Direct fit for the 2015+ Ford Mustang EcoBoost, V6, and V8
  • Internal baffles keep coolant near overflow port during aggressive driving, preventing air entry into coolant system
  • Sight tube allows for proper hot and cold coolant levels
  • Installs in under 1 hour
  • Overflow nipple on fill neck allows for installation of additional NHRA-mandated overflow reservoir
  • 100% aluminum, fully-welded construction for maximum durability during repeated temperature transitions
  • Fits with stock overflow tank cap
  • Available in polished or black powder coat
  • Mishimoto Lifetime Warranty

 

PRODUCT SPECS

MATERIAL 6061 Aluminum
INSTALL TORQUE SPECS 22 in-lbs (2.5N*M) recommended for all worm-gear clamps. These clamps have an operating range of 18-27 in-lbs 2-3N*M. Do not exceed the maximum torque rating of 27 in-lbs (3N*M).
COLOR SilverorBlack

 

PURCHASE INCLUDES

(1) Aluminum Expansion Tank w/ Sight Glass
(1) Overflow Hose
(3) Worm-Gear Clamps
Mounting Hardware
Mishimoto Lifetime Warranty

 

2015 MUSTANG EXPANSION TANK PROJECT, PART 1: STOCK TANK AND 3D MODELING 

It’s hard to match that feeling you get when purchasing a new car, especially the new S-550 Mustang. Picking up your friends for joy rides, melting the tires down the full length of your neighborhood, pulling into the driveway, popping the hood in complete ecstasy … wait … what is that? Is that the coolant expansion tank? Why is it so terrible looking?

This is pretty similar to what happened the day our shop 2015 EB arrived. The engine bay on both the 2.3L and 5.0L vehicles is quite nice, well organized, and clean. Unfortunately, right up front in plain sight sits quite an eyesore in the form of your coolant expansion tank. To improve aesthetics, we decided to tackle R&D to bring you guys a more appealing alternative to the stock tank.

Stock Expansion Tank Exterior

Before jumping into a design of our own, we needed to capture the dimensions and features of the stock unit to ensure that we include these in our component.

Stock Mustang expansion tank
Stock Mustang expansion tank
Stock Mustang expansion tank
Stock Mustang expansion tank

This tank features three coolant ports; two are on the top and one is on the base of the tank.

Stock Mustang expansion tank ports
Stock Mustang expansion tank ports
Stock Mustang expansion tank ports
Stock Mustang expansion tank ports

Despite the primary portion of this tank being constructed from plastic, these ports feature a metal internal sleeve to prevent failure. If you’ve ever removed hoses from an old radiator or expansion tank, you will understand how brittle this plastic can become.

Stock Mustang expansion tank ports
Stock Mustang expansion tank ports

The last remaining external features to consider are the cap threads and fill neck, which are shown below.

Stock Mustang expansion tank cap
Stock Mustang expansion tank cap

Stock Expansion Tank Internal Construction

Stock Mustang expansion tank split
Stock Mustang expansion tank split

Although it is only slightly noticeable from the shape of the exterior, the internal portion of this expansion tank features a ton of baffling. To get a better look, we sliced the expansion tank in half and had a look inside.

Stock Mustang expansion tank split
Stock Mustang expansion tank split
Stock Mustang expansion tank split
Stock Mustang expansion tank split

Each half is shown individually below.

Stock Mustang expansion tank split
Stock Mustang expansion tank split
Stock Mustang expansion tank split
Stock Mustang expansion tank split

What’s with all the chambers? The chambers in the tank are in place to prevent any sloshing of coolant during hard cornering. One of the ports requires submersion in coolant to function properly, and if coolant were to end up below the port location, air would enter the system. As you may know, air within the cooling system can cause serious issues. An air pocket will restrict or block coolant flow which can cause massive temperature fluctuations and overheating. If an air pocket exists, it must be purged from the system to avoid continual overheating concerns. If the port in question were to become exposed to air during hard cornering, the possibility of air pockets entering your coolant system is quite high. This is not something you want to occur at a weekend autocross or track day.

These baffles are just as important as every other feature on this expansion tank.

Baffle Testing

We wanted to see firsthand what impact this baffling would have on coolant movement. We set up a quick testing rig, shown below, to perform our science experiment. We wanted to evaluate the performance of the baffles during simulated driving conditions to determine the need for these in our expansion tank design. We put together this testing rig to show how coolant would react within the baffled tank as well as an empty container without baffling.

Expansion tank baffle testing
Expansion tank baffle testing
Expansion tank baffle testing
Expansion tank baffle testing

We then strapped on our new Go-Pro camera and produced conditions similar to a ride on rough terrain and with aggressive cornering (such as at an autocross). Check out the video!

As you see from these photos/videos, the OE expansion tank isn’t just a plastic jug designed to hold coolant, it is a highly engineered piece which needs a well thought out solution to not only improve under hood aesthetics, but also keep your factory cooling system functioning properly.

With this testing in the books, and in the minds of our engineering team, we set to work on a 3D model for our expansion tank design.

Mishimoto expansion tank 3D model
Mishimoto expansion tank 3D model
Mishimoto expansion tank 3D model
Mishimoto expansion tank 3D model

With the results from our test, we have determine the need for an internal baffle that emulates the stock tank. This will ensure that performance is identical in all situations.

Mishimoto expansion tank 3D model
Mishimoto expansion tank 3D model

Coming up!

We are well on our way to create an appealing and robust aluminum expansion tank. Check back next time for a look at our first prototype unit

 

2015 MUSTANG EXPANSION TANK PROJECT, PART 2: FIRST PROTOTYPE TEST FIT

Last time we gave you some insight into the internal and external design of our expansion tank, and now we have our first prototype! Keep in mind, this prototype was constructed to verify fitment and functionality. We selected our standard polished finish, but we are certainly keeping in mind all the feedback regarding the finishes and colors everyone would prefer.

Mishimoto Expansion Tank Prototype

No more stalling, check out our prototype tank!

Mishimoto expansion tank prototype installed
Mishimoto expansion tank prototype installed
Mishimoto expansion tank prototype installed
Mishimoto expansion tank prototype installed
Mishimoto expansion tank prototype installed
Mishimoto expansion tank prototype installed

A look at the mounting points for the fan shroud!

Mishimoto expansion tank prototype, mounting points
Mishimoto expansion tank prototype, mounting points

Our setup for the fluid level indicator is shown in the image below.

Mishimoto expansion tank prototype, fluid-level indicator
Mishimoto expansion tank prototype, fluid-level indicator

And here’s a look at our CNC-machined aluminum fill neck, which is designed to function with the stock radiator cap.

Mishimoto expansion tank prototype, fill neck
Mishimoto expansion tank prototype, fill neck

One additional feature to note is our incorporated overflow nipple on the expansion tank fill neck. In the event of overheating and a highly pressurized coolant system, this nipple will bleed off coolant and pressure. We will be including a silicone coolant line which routes from this nipple to the ground in order to properly release coolant being pushed from the reservoir. Without this line, fluid expelled during an overheat would be thrown on the engine and electronics, not something you want.

For those who are seeking a system with NHRA compliance, a sealed reservoir can be attached to this silicone line in order to prevent fluid from hitting the track in the case of an overheating situation. Any of the universal sealed fluid tanks we offer can be utilized for those seeking such a system.

Mishimoto coolant reservoir tank

Back to the test fit! Everything fit perfectly on the shroud, with the fill neck, and with the stock hose routing. We also checked the clearance of our tank to ensure that it was not making contact with the hood insulation.

Mishimoto expansion tank prototype clearance check
Mishimoto expansion tank prototype clearance check

Prototype Internals

With a successful test fit, we decided to cut open this prototype to compare the internal baffling with the stock tank. Although the aluminum design is a big improvement over the stock tank, the baffles are one of the unique features of our tank in particular.

Check it out!

Mishimoto expansion tank prototype, internal baffling
Mishimoto expansion tank prototype, internal baffling
Mishimoto expansion tank prototype, internal baffling
Mishimoto expansion tank prototype, internal baffling
Mishimoto expansion tank prototype, internal baffling
Mishimoto expansion tank prototype, internal baffling

Check out a few comparison shots showing our tank next to the stock unit. Take note of the port locations that are designed to function with the stock hoses.

Stock expansion tank (left) and Mishimoto expansion tank prototype (right)
Stock expansion tank (left) and Mishimoto expansion tank prototype (right)
Mishimoto expansion tank prototype (left) and stock expansion tank (right)
Mishimoto expansion tank prototype (left) and stock expansion tank (right)

Design Modifications

So far, everything was looking great with our tank design. That said, after a brief discussion among our team members, we determined that a few aesthetic modifications were needed. When you open the hood of your new Mustang, the expansion tank is the first component you see. Our current design is a bit square and seems like just a box sitting within the engine bay. We decided to tweak the front face in order to blend this component with the existing components within the engine bay. Check out what we have planned.

Mishimoto expansion tank prototype modification
Mishimoto expansion tank prototype modification
Mishimoto expansion tank prototype modification
Mishimoto expansion tank prototype modification

Another interesting adjustment is the modification of the tank mounts. Previously we had used two individual tabs mounting to the shroud. We decided to merge these into one solid mounting point.

What’s Next?

After deciding on adjustments, we needed to revise our models and work up a new prototype. Check back next time for a look at our final prototype design. We will also have details regarding our upcoming discounted presale for this expansion tank.


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