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2021 Honda Accord Sport 2.0T (Still Night Pearl)
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Discussion Starter · #1 ·
Starting to dive into modding my car and started with a Cold Air Intake. I was searching for a cold air intake that offered two things:

1. Increased performance
2. Aesthetically pleasing.

I was at a crossroads to go for the Mishimoto intake or the PRL Motorsports intake. I understood that the PRL motorsports intake was the best value in terms of performance gains, but the cheap looking black plastic box just really steered me away from it as it did not fulfill something I was looking for aka being aesthetically pleasing when looking at the engine bay. So I decided to order the Mishimoto intake because they had dyno sheets claiming decent gains, and the carbon fiber lid looked awesome.

Below is picture of it after installation:
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Although I was pleased with how it looked and sounded, I was disappointed with how it performed. There was a noticeable loss in throttle response and low end torque. The difference wasn't massive but I drive my car about 50 miles a day and it was VERY noticeable to me. I had a friend drive it with the OEM intake and with this intake he agreed that he could feel the loss of torque as well. This was discouraging to have these kind of results. After comparing the stock intake to this Mishi one I was trying to figure out what could be causing it. The only real difference is the cone filter which in theory should be less restrictive so I ruled that out and the hole in the front of box. I assumed it must be the hole in the box causing it to suck in hot engine bay air instead of using the factory snorkel only like the OE intake. I decided I would make an airtight cover for the hole to test my theory.

Below is what I came up with:

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What you see above is some orange plastic I had laying around in the garage, along with a rubber hose to line the outside of the hole to make an "airtight" gasket. I bolted together a piece of plastic on the inside and outside of the box to sandwich together against the gasket and the box. I drove it this way simply as a test that was proven to be successful. Low end torque and throttle response was restored by using the factory snorkel only instead of also having a mixture of hot air coming in from the engine bay. Now from this stage and knowing my idea had worked I had to come up with a better looking solution which can be seen below:

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The finished product is a custom made 3k twill matte carbon fiber cover that matches the Mishimoto lid for the intake quite well. I ordered a Carbon fiber sheet and used a Dremel to do a rough cut and then wet sanded it down to get a near perfect shape and made a much better gasket using the a type of hose that would be used for vacuum lines in the engine bay so I knew they were heat resistant just like the carbon fiber would be. With this setup I have the performance and looks I was hoping to get. Mishimoto should sell these as a closed system to begin with. Either way with a little TLC was able to get a setup I am very pleased with. To finish this setup I plan on switching to the PRL Silicone intake tube as well. I will post more pictures tomorrow.
 

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2021 Honda Accord Sport 2.0T (Still Night Pearl)
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Discussion Starter · #3 ·
Did you do a grams per sec comparison between the two setups?
Only thing used for the test here was the good ol' butt dyno test, so I know many people will disregard it. Although, there was a notable difference in throttle response and low end torque when the Mishimoto intake side hole is covered vs uncovered.
 

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It has been mentioned in previous posts that the open to engine bay CAI have produced negative results. From what I'm getting from your mod is you closed off the opening to hot engine air but I wasn't aware that the Mishimoto also used the OEM snorkel intake too. Can you provide pics of how it is using that/now getting air supply?

BTW - nice looking mod. (y)
 

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I like can you take pics of the inlet where the air comes in now? Have you thought of possibly enlarging that area? Hybrid filter is in entirely different spot behind the engine. Really like what you did, just trying to see if you can get the most airflow possible.
 

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Lunar Silver 2019 Honda Accord Sport 2.0T 10AT
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So you just made a PRL HVI :)

Nice custom work though. Always good to see.
 

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2021 Honda Accord Sport 2.0T (Still Night Pearl)
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Discussion Starter · #8 ·
It has been mentioned in previous posts that the open to engine bay CAI have produced negative results. From what I'm getting from your mod is you closed off the opening to hot engine air but I wasn't aware that the Mishimoto also used the OEM snorkel intake too. Can you provide pics of how it is using that/now getting air supply?

BTW - nice looking mod. (y)
Of course! Circled below is where the Mishimoto Intake connects to the bottom of the OEM snorkel. In between the opening to intake and the bottom of the snorkel is the OEM grommet used for the stock intake which is compatible with the Mishimoto air box.
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And circled below is where all the air is now being pulled through at the moment.
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Discussion Starter · #9 ·
I like can you take pics of the inlet where the air comes in now? Have you thought of possibly enlarging that area? Hybrid filter is in entirely different spot behind the engine. Really like what you did, just trying to see if you can get the most airflow possible.
Below is the only inlet pulling air in at the moment. I definitely need to see what I can do to enlarge this!

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Of course! Circled below is where the Mishimoto Intake connects to the bottom of the OEM snorkel. In between the opening to intake and the bottom of the snorkel is the OEM grommet used for the stock intake which is compatible with the Mishimoto air box.
View attachment 7054
And circled below is where all the air is now being pulled through at the moment.
View attachment 7055
Ahhhh, ok. So Mishimoto was using two sources for air in the attempt to receive more. Mishimoto should have went a little further in their R/D and created a snorkel that would have fed both inlets on their box to eliminate the induction of the heated air under the hood. :unsure:
 

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Discussion Starter · #11 ·
Ahhhh, ok. So Mishimoto was using two sources for air in the attempt to receive more. Mishimoto should have went a little further in their R/D and created a snorkel that would have fed both inlets on their box to eliminate the induction of the heated air under the hood. :unsure:
Totally agree that they skimped out in the R&D. A snorkel feeding both holes would be very interesting. I need to see what I can come up with to get a bigger snorkel and maybe closer to the front of the car as well.
 

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Totally agree that they skimped out in the R&D. A snorkel feeding both holes would be very interesting. I need to see what I can come up with to get a bigger snorkel and maybe closer to the front of the car as well.
If you fabricate something don't forget to patent it. :D
 

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Might want to try some brake duct hosing and duct.


 

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Lunar Silver 2019 Honda Accord Sport 2.0T 10AT
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Discussion Starter · #16 ·
Might want to try some brake duct hosing and duct.


I'm looking into enlarging that duct right now. May take a bit as I plan to make it out of carbon fiber. I will post what I come up with in the future.
 

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I actually took the lid off where you access the cone filter on PRL HVI for sound 🙃 but the IATs didn’t dramatically change maybe around 5-10 degrees hotter from the ambient temperature on a cool day outside but on a really hot summer day it would be 15-20 degree hotter. If I wasn’t such a junkie for turbo noises I would’ve left the lid on for the best performance of the system.
 
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