Mazda 6 Turbo Lowering Springs Release!

2018+ Mazda 6 Lowering Springs

We at CorkSport are happy to introduce the Sport Lowering Springs for 2018+ Mazda 6 equipped with the 2.5L turbocharged engine. In our last post, we talked about the height, handling, and quality of our new springs. If you haven’t seen it, check it out HERE. Today we’ll cover how we tested the ride quality and go a step further to talk about damping and natural frequency. I’m going to warn you now; this gets a little bit complicated, but we’re happy to answer any questions you may have.

Spring Damping

Let’s start with a basic example–your car hits a bump which compresses the spring. It “springs” back to its normal length. In a perfect world with no friction or damping, the springs in your suspension would keep bouncing up and down forever, this is called oscillation. Add back in dampening and friction, and the spring will settle out to its normal length pretty quickly. How different strengths of damping affect the “oscillation” can be seen in the graph below.

Spring damping graph
Spring damping example.

The car has hit the bump at the bottom left of the graph. As time goes by, you can see the spring expand and compress and so on. The Greek letter is not important but what is important is the numbers. When it is 0 (black line) the spring compresses and expands over and over to the same height. As the number increases, you can see that the spring returns to its normal length faster until it gets too large and overpowers the spring (dark blue line). For a car, the 0.4 to 1 range is ideal as there is minimal “bouncing” without having too high of damping.

What does all this mean though? Let’s say from the factory the car is in the 0.7 range (orange line). If we went to a drastically stiffer spring, but kept the OEM dampers, we may end up in the 0.2 range (light blue line), which would be uncomfortable due to all the bouncing every time you hit a bump. The CorkSport front and rear spring rates chosen are small enough of a change to fit well with the OEM damping, ensuring no bouncing.

Stock 2018 Mazda 6 and CorkSport Modified Mazda 6
Stock height vs. CorkSport Springs

Natural Frequency Analysis

To go along with this, we did some natural frequency analysis. Natural frequency simplified is how quickly the suspension responds to a bump. Higher the natural frequency, the harsher the ride in a car is. Most “regular” production cars sit in a 1.0-1.6 Hertz (Hz) range for a comfortable ride. Sports cars are usually in the 1.6-2.3Hz range. Full race cars are usually 2.3-3.0 or even higher. An average person will start thinking a ride is stiff/harsh at around 2.0-2.2Hz. Using a special app that ties into the accelerometers of a cell phone we can approximately measure the frequency of a specific suspension setup. With stock suspension on the Mazda 6 2.5T, this yielded ~1.4Hz front and ~1.7Hz rear.

With a stiffer spring, these frequencies will increase, but we wanted to be sure to only increase them slightly, to not severely affect comfort. We went through a few different combinations to get our ideal result. Our final setup ended up at ~1.5Hz front and ~1.85Hz rear. This is enough to notice the suspension feels “sportier” without riding harsh.

2018+ Mazda 6 Roller Shot

There is one other big thing to highlight with frequency. Notice that both the OEM and CorkSport springs have a higher rear natural frequency than front. If your natural frequency front to back is close to equal, the car has a tendency to “pitch” front to back over bumps. Since your rear tires hit the bump slightly later than the fronts, to have a comfortable ride the rear suspension has to “catch up” to the fronts to prevent this pitching back and forth. If a frequency is too much higher in the rear, it can be too fast for the fronts and cause the same pitching issue.

Natural frequency was always on our minds when designing the CS springs and we tested a bunch of different combinations to determine the optimum balance of ride and handling.


That about does it for the Mazda 6 2.5T Sport Lowering Springs. Be sure to let us know if you have any questions-suspension is hard, even for us! Lastly, be sure to share your MZ6T with us by using #CorkSport.

-Daniel @ CorkSport

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2018+ Mazda 6 Turbo Lowering Springs

2018 Mazda 6 on CorkSport Lowering Springs

We at CorkSport are happy to introduce the Sport Lowering Springs for 2018+ Mazda 6 equipped with the 2.5L turbocharged engine. We took a fresh approach to spring design to offer you the best combination of style, ride quality, and handling in a package that fits just like OEM. The new Mazda 6 looks great, but a functional drop gives it just what it needs to look even better. Combine this with the new handling characteristics and your MZ6 2.5T transforms from a fun grocery getter to something you can actually enjoy on backroads.

Mazda 6 2.5T CorkSport Lowering Springs
2018+ Mazda 6 2.5T CorkSport Lowering Springs

Ride Height

Let’s start off with the big one: ride height changes. These springs offer a conservative drop from the stock springs with about 1 inch lower in the front and about 0.75 inches lower in the rear. We chose this height as it offers a great new look without sacrificing any of the daily drivability of the Mazda6. This height clears the typical driveway with no issues, and retains plenty of suspension travel, even when fully loaded with 5 adults and weight in the trunk. Check out the image below for a direct comparison to a fully stock MZ6.

Lowered 2018 Mazda 6 vs. Stock Mazda 6
Black: Stock Springs Red: CorkSport Lowering Springs

Handling

The height drop will be noticed when you’re outside the car, but the handling improvements will be apparent when driving. By lowering the center of gravity and stiffening the springs, body roll is reduced in corners, giving you extra confidence when attacking that backroad. In addition, we stiffened the rear springs more than the fronts, reducing understeer. By number, this meant 3.8K front springs (25% stiffer than OEM) and 7.3K rear springs (45% stiffer than OEM). Derrick, our resident racecar driver and MZ6T owner, loves the new setup.

2018 Mazda 6 on CorkSport Springs

While this may sound like a big jump, they ride similarly to the OEM springs. We used a natural frequency analysis to ensure we achieved comfortable characteristics over bumps. Read the last half of this blog for more info on what that means (it’s complicated but awesome). Part of the great ride is the OEM dampers (shocks and struts). The spring rates we chose fit well with the stock shocks and struts to prevent any bounciness, plus, the conservative drop ensures you are in the normal operating range of the dampers. This means no prematurely worn shocks/struts due to springs that are too low.

Lowered MZ6T

Material Quality

Last but not least, the CS Sport Lowering Springs are made from high tensile strength spring steel and come powder coated in an OEM style black for long-lasting quality and corrosion resistance. They install just like stock, reusing all your OEM components. The only permanent modification is trimming the bump stops to match OEM suspension travel.

Be sure to check out the product listing for more images, a product video with more comparisons to OEM, and pricing. Make your new Mazda 6 yours with just the right styling and handling boost from CorkSport.


That about does it for the Mazda 6 2.5T Sport Lowering Springs. Be sure to let us know if you have any questions-suspension is hard, even for us! Lastly, be sure to share your MZ6T with us by using #CorkSport.

-Daniel @ CorkSport

Shop Now

Welcome to the Gen3 Mazda 3 Suspension Package

Mazda 3

Want to upgrade your suspension system on your Gen3 Mazda3, but don’t want to deal with the headaches that come with lowering springs or coilovers?

Introducing the CorkSport Adjustable Shock/Strut Assembled Package for 2014+ Mazda 3. This truly is a complete package that includes CorkSport lowering springs, CorkSport adjustable shocks/struts, and CorkSport camber plates all assembled and ready to install.

 

 

We’ve discussed before how the CorkSport adjustable shocks and struts are a great compliment to the CorkSport lowering springs. Now we have included them together in a package with our camber plates to give a huge handling and adjustability upgrade to any Gen3.

In addition, this package comes assembled with new OE dust boots, pivot bearings, and bump stops that are even cut to proper length to match the lower ride height. Since this package comes assembled with new parts, installing it is a snap. No spring compressors needed at any point. Check out the image below to see exactly what you get in every box.

 

 

Whether you are looking to replace some worn out OE components and get a style bonus, or are looking for some and handling and adjustability for your racecar, the CorkSport Adjustable Shock/Strut Assembled Package can help you reach your goal.