Platform: Mitsubishi EVO
Design: Ozzy Motors
This was pretty easy and actually only required a tape measure to complete. All we needed was the turbo diameter (5 inches) as well as the distance from the front of the bumper to the front of the turbo. This length determined the angle that the plug needed to be cut at. With these dimensions in hand it was time to start the plug!
After spending $15 at Home Depot we were ready to make the worlds cheapest and easiest plug! It happens that the outer diameter of a 4 inch ABS pipe coupler and cap is 5.06 inches. Perfect fit for us! We bought a coupler, a cap and a small section of 4 inch pipe to connect the two together. Once assembled, we used the dimensions taken from before to determine the angle to cut the plug to. Good old SOHCAHTOA came through again!
A little bit of sanding and waxing and the plug was ready to go! We also waxed a mirror surface to do the layup on for a glossy finish.
This is where we got creative and I encourage you to do the same for your next project! In order to create the flange that sticks out from the tube, we used a two part mold: the mirror and the ABS plug. The picture below is a diagram of the layup for reference. The red lines are the layers of carbon fiber.
It is important to do a layup like this in the correct order so I have laid it out below:
Take an in depth look at the wet lay-up process.
This is where the fun begins! Remove the part from bagging materials and flip it over to see the surface finish. Expect to find a funny looking circle in the middle. This is correct and actually wanted! It is this circle that will need to be cut out.
The other side should also look good and compact. It won’t be glossy and pretty, but that is okay because it will be hidden within the car.
It is now time to remove the plug. Using the rough spot on the glossy side, drill a hole and make a rough cut out of that area. This will allow you to hammer the plug out. Depending on how well the plug was waxed, this can be very easy, or extremely difficult. So make sure to wax well! With the plug removed you will now see the part taking shape:
Use a Dremel or small reciprocating saw to trim back the rest of the interior circle cut out. Once close, use a little sandpaper to add a nice radius. If completed properly, you shouldn’t be able to tell that the flange and the interior cylinder are different pieces of carbon fiber.
With the center cut out, you are now ready for the final trim. We settled on an 8 inch outer diameter and marked this out on the flange. We also trimmed back the cylinder to have a square and smooth end. The result is a pretty complex looking carbon fiber part:
At Common Fibers we are a bunch of perfectionists. We weren’t 100% satisfied with the surface finish of the flange so we decided to sand that down and clear coat it along with the inside of the duct. For such a small part we decided to just use some rattle can clear enamel. It gets the job done and is plenty durable enough for this application.
Here is the part after a few layers of clear coat. It is ready to go!
With the part complete we were ready to install it on the EVO. It fit snug like a glove and looks pretty awesome! Take a look and let us know what you think!