If you’re looking for a performance part for your Gen 4 Mazda 3 & CX30 to elevate the driver experience then the CorkSport Rear Motor Mount. This CS RMM is designed to fit any 2019+ Mazda 3 & CX30 whether it is AWD or FWD, Turbo or NA, MT or AT. The key focal point for this RMM is to offer the driver additional feedback for what the car is doing when driving hard. The CS RMM helps eliminate the excessive engine movement, increase throttle response and provide a more solid shifter feel if you have a car with a stick.
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Starting with the main body of the CorkSport RMM, it is manufactured from A356-T6 aluminum to provide a robust and light weight mount that effectively replaces the quite large and heavy OEM mount. The factory mount features a large rubber center section which contributes to the excessive engine movement and additional weight. For the CS RMM we decided to add smaller bushings towards the front and back of the mount which allowed us to save material and weight. Below you can see the two RMM’s compared against one another.
Now onto the polyurethane bushings, which play a big role in the increased driver feedback and reduction in engine movement. We tested the selected 70A bushings extensively and found that they offer a good combination of providing both a noticeable improvement in the driving experience while not introducing to much extra noise, vibration, and harshness (NVH) into the mix for daily driving.
NOTE: NVH (noise, vibration, harshness) is a standard term used in the automotive industry. NVH is a byproduct of changing some OEM components to aftermarket components in the pursuit of focused performance. Example of components that can increase NVH: engine mounts, clutch/flywheel, intake, exhaust, suspension, tires/wheels…and many more.
During the first stage of testing we started out with only two poly bushings in the front of the RMM, but after further testing we found that adding an additional two bushing to the rear of the RMM provided much lower NVH while still reducing engine movement considerably.
The last piece that is fundamental in the CS RMM is the bushing sleeves. The sleeves provide the ability to install hardware through the polyurethane bushing without having the bushing itself compress and possibly crack when applying torque to the bolt and instead transfer the force into the sleeve. The bushing sleeves are precision machined out of steel for strength and then zinc coated so they will not corrode over time and wear out the polyurethane bushing prematurely.
Ok, so now how does the CS RMM improve the driver experience? Well, the factory RMM allows the motor to rotate a good amount which helps provide a smooth driving experience for around town, but this increase in engine movement decreases the throttle response and shifter feel.
This is because the motor is allowed to rotate a certain amount before the wheels do, so by decreasing the amount the motor has to rotate, allows the wheels to start rotating sooner, thus increasing the responsiveness of the car. This reduction of movement also provides a better shifter feel if you have a manual because there is less movement between the connection of the shifter and transmission.
What to expect from the Rear Motor Mount:
From our testing in multiple R&D cars and beta tester cars and the thousands of miles driven…it’s awesome! From about 2000rpm up to redline you are going to feel a smooth engine that loves to give you feedback on your throttle, shifting and engine braking. Below 2000rpm to idle you may notice some vibration, especially when the A/C pump is in operation.
Thanks for checking out the CorkSport Rear Motor Mount for the 4th Gen Mazda 3 & CX30! If you want to add this mod to your Mazda and get all the benefits discussed above, be sure to head over to the product page for more details.
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Elevate the driver experience with the CorkSport Rear Motor Mount.
