DelllyJougnut's Sport FK7 Build Journal

dellyjoughnut

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May 16, 2019
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Location
Los Angeles, CA
Car(s)
Toyota 4Runner, '19 Civic Sport Hatchback
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Had the 2019 Civic Sport Hatchback since August 2019. Most of what I plan is to DIY it as much as I can without buying.

Current mods on the cars as of June 9, 2020:
  • Rear diffuser (2019)
IMG_1358.jpg

  • Aluminum sheet metal covering the area right in front of the rear lower control arms on the left and right side of the car. (2019 & June 2020) The photo you see below is for the driver's side where the gas tank is.
IMG_1366.jpg
IMG_1369.jpg



The general procedure is using cardboard to get a rough template. Transferred cardboard template to craft paper. Transfer craft paper template onto 0.063" aluminum I could find at my metal supplier in the remnants section. Mounting is based on utilizing any existing hole and fasteners. To stiffen some of the sections, I used the backside of a blacksmith's hammer and a 25lb mallet to emboss the sheet metal with ridges.

For the rear diffuser. It's made using 4 different panels with screws and nuts. I had to fashion bracket with a roller dies to hold it in 2 places. I used existing bolt holes on the rear crash beam for mounting the back portion of the diffuser. The front section of the diffuser is attached to the exhaust pipe with another bracket, nuts, and bolts.


I did these two mods to hopefully decrease drag even further and increase MPG. I know honda did a good job on the aero, but I want to go farther. I have driven as fast as 100mph to get a feel for the rear and it's different from stock, but it's subjective to my perspective. I chose not to paint these pieces. The rear diffuser is dirty with road dirt, but it's a way to assess airflow and a need for strakes. So far I seeing a smooth flow pattern from the middle section of the diffuser. The section behind the tire does not exhibit that pattern. I'll have to confirm with flow-vis paint of some kind to be sure.



Future mods:
  • Aluminum gated shifter.
  • Wheel covers for drag reduction on stock 18" or buy wheels that have wheel covers in 18"
  • Tein Flex Z with EDFC
  • Lighter exhaust system not using stainless steel and titanium.
  • Rear wing without drilling door to the trunk.
  • New intake manifold using Porsche's design that works only with forced induction. I found their patent google searching for it. This mod will not happen anytime soon due to complexity and need to verify in CAD.

Edit: Additional Mods added on 9/6/2020
  • Differential: Wavetrac or Mfactory
  • Transmission gearset: PPG gearset
  • New pistons and connecting rods
  • Pistons get thermal barrier coating
  • WPC Treatment on everything that moves
I'm currently a working student and can only do smaller projects like a gated shifter, but this is what I plan. No plans to tune ECU for now. Focusing more on aerodynamics.
 
Last edited:
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dellyjoughnut

Senior Member
Joined
May 16, 2019
Messages
106
Reaction score
41
Location
Los Angeles, CA
Car(s)
Toyota 4Runner, '19 Civic Sport Hatchback
Country flag
  • Thread starter
  • Thread Starter
  • #2
Currently working on my own design of a strut brace. I have looked at the chassis diagram of the FK7 and came to the conclusion the strut tower is connected to the firewall due to how it's constructed.
 

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