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Cosmetic Modification (Interior/Exterior/Lighting) Discussions about cosmetic mods. |
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11-18-2020, 07:44 PM | #15 | |
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On the 2 larger panels I used exterior foam tape around the perimeter of the panel before putting in the push pins. I was a bit worried about winter getting between them and making things worse though, not rocks.
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11-18-2020, 10:53 PM | #16 |
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Great review
Great review, thanks. I just got these and will install in the next few days. I got them to replace the carboard-like panels on the 86 (I don't know what the material is called, but I wanted something more flat, solid and protective for the undercarriage to supplement the underbody paneling I am installing.
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12-04-2020, 08:09 AM | #17 |
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After installing the JDM underpanel aero covers, I highly suggest to complete the flattening of the underbelly with Verus Transmission Tunnel Cover, Suspension/Differential Covers, and Rear Diffuser. These will highly reduce the underbody drag esp in the transmission & bumper, create downforce, & increase stability at high speeds even on the highway. I noticed that it's so much easier for me to accelerate from 80-150kph with them on. Not only will they reduce road noise, they'll also protect the underbody parts especially from debris. I noticed that it muffled my (TRD) exhaust note a bit too, which I welcome, perhaps it's because the transmission cover has direct contact with the midpipe & absorbs some of the exhaust's vibrational frequencies. However, I noticed that the midpipe & the transmission cover have developed a rattling at 2k-2.3k rpms perhaps from the screws loosening a bit. That's why my next project is to wrap the midpipe with a DEI heat shield that will act both as noise dampener & heat manager as well. We'll be wrapping the resonator too so, hopefully, more sound will be dampened & a more whole note will be made by the exhaust.
Whether you, guys, have covered the underbelly or not, if you have a pressure washer, I highly suggest to buy the underbody washer attachment to rinse off mud & snow salts too.
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Modding for daily fun & efficiency: Gruppe-S UEL, HKS dual res. FP, STi Per. Muffler, Delicious T. Ecutek tune, Crawford BPB, Grimmspeed CAI, STi Flex T. Bar, TRD Door Stabilizer, DSS aluminum propeller shaft, Verus diffuser & underbody covers, Verus LCA, Perrin bushings, Bilstein B6+RCE Yellows, Michelin PS4S + 18" WedsSport TC105X-summer, Michelin Alpin PA4 +18" Motegi MR140-winter
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12-08-2020, 01:04 PM | #18 | |
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12-09-2020, 07:34 AM | #19 | |
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Modding for daily fun & efficiency: Gruppe-S UEL, HKS dual res. FP, STi Per. Muffler, Delicious T. Ecutek tune, Crawford BPB, Grimmspeed CAI, STi Flex T. Bar, TRD Door Stabilizer, DSS aluminum propeller shaft, Verus diffuser & underbody covers, Verus LCA, Perrin bushings, Bilstein B6+RCE Yellows, Michelin PS4S + 18" WedsSport TC105X-summer, Michelin Alpin PA4 +18" Motegi MR140-winter
Last edited by sygfrid; 12-09-2020 at 08:34 AM. |
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12-09-2020, 10:07 AM | #20 |
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I have only the funds to slowly install these items one at a time. In what order would you suggest I purchase and install? Thanks for any advice
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12-10-2020, 04:37 AM | #21 | |
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(Optional) 0. Design Engineering Form-A-Shield thermal insulation 42"x48" (US$130) - if your aftermarket exhaust is too loud to your liking esp. inside the cabin, the light-weight thick thermal insulation can dampen the "tin can note" of the exhaust if you wrap it around the front pipe, mid pipe, & even the resonator/muffler. It'll also reduce the radiant heat that warms the cabin esp in the summer & you're stuck in traffic. You can use it too to form a heatshield around your aftermarket headers to reduce engine bay heat & protect the rubbers & plastics. 1. Verus Rear diffuser (US$550) -to cover the rear bumper's internal portion that can act as a parachute & create lots of drag especially if you have aftermarket exhaust (the OEM exhaust was designed to act as a diffuser too that's why you'll notice that its wide housing stretches all the way to the reverse light area. Covering this huge portion allows the attached low pressure air to smoothly pass from the differential area to the rear & reduce the rear "wake" that causes drag. 2. Verus Transmission Tunnel Covers (US$180) - to cover another source of turbulent air that creates drag. IMO, it's more efficient to start with this than the JDM since you'll need to drill through the existing 2 holes for its installation. Later on, the JDM panels will also use these holes. You'll have a more quiet cabin too when you cover this section. 3. JDM Aero Under Panel Covers (US$265)- easiest to install. The stream-lined covers will feed cleaner attached air to the rear diffuser. Their mounting points will be behind the Transmission Tunnel Covers. 4. Rear Suspension/Differential Covers (US$290) - directs the attached clean air uninterruptedly from the JDM panels to the rear diffuser. Unfortunately, 1 of its mounting points can't be installed directly into the chasis as the JDM (fuel tank) cover will be in the way. You'll have to drill through the JDM cover & mount a section onto it. I think Verus designed these without the JDM panels that's why a little improvisation is needed. (optional) 5. TRD Front Spoiler (US$350++) or Verus Splitter (US$360)- still on my bucket list as I wait for the borders to open. I didn't prioritize the front splitter or spoiler as it only encompasses a very small area & its impact is less significant compared to very large area that the underbelly & the rear that the clean low pressure air needs to travel through. I hope you'll be able to complete the entire system of flattening out the undercarriage. As Julian Edgar (author of Modifying the Aerodynamics of your Road car) has explained, think of the undercarriage as 1 continuous system for the low pressure air to work in effectively reducing lift & drag. The clean low pressure air should start from the front and flow uninterruptedly all the way towards the rear. If the air becomes turbulent somewhere on its way to the rear, the diffuser may not be able to completely do its job of reducing lift & drag. I hope this helps.
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Modding for daily fun & efficiency: Gruppe-S UEL, HKS dual res. FP, STi Per. Muffler, Delicious T. Ecutek tune, Crawford BPB, Grimmspeed CAI, STi Flex T. Bar, TRD Door Stabilizer, DSS aluminum propeller shaft, Verus diffuser & underbody covers, Verus LCA, Perrin bushings, Bilstein B6+RCE Yellows, Michelin PS4S + 18" WedsSport TC105X-summer, Michelin Alpin PA4 +18" Motegi MR140-winter
Last edited by sygfrid; 12-17-2020 at 04:03 AM. |
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12-10-2020, 11:22 AM | #22 |
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sygfrid thanks for the fantastic advice and the logic behind it all. I think I will jump ahead to the tunnel covers as I install the full JDM under panels soon after I purchased my car and I still have the stock exhaust. I also put sound deadening though out the car and I can hold a conversation inside with out having to raise my voice. Also installed was an inexpensive front lip to protect the front bumper, so the tunnel is the first area heading back to the rear that opens up and would allow turbulence. My goal is not so much for downforce but low drag while on the highway. If I didn’t have the big stock muffler then the rear diffuser would have been my first choice to meet that goal. Again thanks again for the well thought out answer to my question.
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04-02-2021, 10:04 PM | #23 | |
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1. Do at least the lower 1/3 inside the doors. 2. Remove the interior rear side panels (ones that cover rear speakers) and the rear bottom seat cushions. Put the damping material inside the exterior sheet metal everywhere you can reach behind the speakers. Including up on fenders above rear wheel area. Put it all around under the seat cushions too. 3. Remove the spare tire and foam parts from bottom of your trunk. Line the bottom of your trunk with damping material. Make sure you use a good roller to get out all the air pockets. Doing all that on the rear even took some of the interior loudness coming from my muffler delete. |
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The Following User Says Thank You to Totmacher For This Useful Post: | T-Steve (04-02-2021) |
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