Make sure you have your splash guard on
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Thread: Make sure you have your splash guard on

  1. #1
    Nooblets
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    Make sure you have your splash guard on

    Story: I recently bought a 2013 Civic and during my first oil change I noticed that the person before me had completely removed the big splash guard that goes underneath the engine (a big plastic sheet-like piece that runs the width of the car and from the front fender to about 1/3rd of the way to the rear; it has 2 metal sheets attached to it).

    I eventually tracked one down at a junk yard and saw an immediate difference of 1-2 MPG in every kind of driving condition. My city-only trios went from 26 to 28, mixed went from 36 to 37 or 38 (it varied). And once a month I take a long drive upstate where I just set the cruise to 65 the whole time; I used to max out at 47 MPG, now I'm maxing out at 48.

    Anyways, I know sometimes people lose these splash guards for whatever reason, but make sure you keep yours on, as it's well worth having.

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    Super Mod's Pet baby_blue_6_4's Avatar
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    They are the underbody spoiler air diffuser and they smooth out the underside so it's less resistance aerodynamically. Some remove them due to braces being added and they are unable to fit with them installed without being modified. I'll be in that boat for the rear one when I install the Ultra Racing rear subframe brace.

  4. #3
    I Need A Vacation kev604's Avatar
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    Good post. Honda spent alot of money designing that piece and testing it in wind tunnels and is a part of the car just like a door handle or windshield wiper and yes it absolutely helps MPG especially long highway drives.
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  6. #4
    Platinum Member Teeps's Avatar
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    Quote Originally Posted by kev604 View Post
    Good post. Honda spent alot of money designing that piece and testing it in wind tunnels and is a part of the car just like a door handle or windshield wiper and yes it absolutely helps MPG especially long highway drives.
    Agree, but I have to wonder what is worse:
    a front engine under cover plate that is missing
    or
    a front engine under cover plate that is mangled or detached in the front

    How some here are getting 26 MPG or more in town continues to baffle me.
    My '12 sedan is doing good to get 23. something under these conditions, last tank it got 22.1 MPG.
    In town trips for me rarely are faster than 35 mph, or longer (one way) than 3 miles.
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    Platinum Member team3d's Avatar
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    Quote Originally Posted by iamadoorknob View Post
    Story: I recently bought a 2013 Civic and during my first oil change I noticed that the person before me had completely removed the big splash guard that goes underneath the engine (a big plastic sheet-like piece that runs the width of the car and from the front fender to about 1/3rd of the way to the rear; it has 2 metal sheets attached to it).

    I eventually tracked one down at a junk yard and saw an immediate difference of 1-2 MPG in every kind of driving condition. My city-only trios went from 26 to 28, mixed went from 36 to 37 or 38 (it varied). And once a month I take a long drive upstate where I just set the cruise to 65 the whole time; I used to max out at 47 MPG, now I'm maxing out at 48.

    Anyways, I know sometimes people lose these splash guards for whatever reason, but make sure you keep yours on, as it's well worth having.
    Quote Originally Posted by baby_blue_6_4 View Post
    They are the underbody spoiler air diffuser and they smooth out the underside so it's less resistance aerodynamically. Some remove them due to braces being added and they are unable to fit with them installed without being modified. I'll be in that boat for the rear one when I install the Ultra Racing rear subframe brace.
    Quote Originally Posted by Teeps View Post
    Agree, but I have to wonder what is worse:
    a front engine under cover plate that is missing
    or
    a front engine under cover plate that is mangled or detached in the front

    How some here are getting 26 MPG or more in town continues to baffle me.
    My '12 sedan is doing good to get 23. something under these conditions, last tank it got 22.1 MPG.
    In town trips for me rarely are faster than 35 mph, or longer (one way) than 3 miles.

    i think op's missing the front so he add it back...

    the front under body panel is only available for the r18 civic, si don't have it, i did install the front underbody panel on my car and i did not see any improvement, we also remove the rear one and i also don't see any negative effect without the rear under body panel..

    the only aerodynamic honda part that made a huge difference (on any of my car) will be my honda accord plug-in factory 17" wheels with aerocover... my r18 jump from 26mpg to 36mgp, i usually swap wheels once every 6 months~1 year, but this forged factory wheel perform so well that i have been using it for 2 years straight.

    my r18 with 300mm brake kit never fade anymore (stock is 272mm), when 18-wheeler next to me at high speed, my car do not drag into it anymore, it is the one of the best wheels i have ever experience since since 1986. even my 13lbs forged joustmeister don't perform the way oem plug-in wheels does...
    Last edited by team3d; 04-12-2017 at 11:33 AM.

  8. #6
    Platinum Member Civi9's Avatar
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    Quote Originally Posted by Teeps View Post
    Agree, but I have to wonder what is worse:
    a front engine under cover plate that is missing
    or
    a front engine under cover plate that is mangled or detached in the front

    How some here are getting 26 MPG or more in town continues to baffle me.
    My '12 sedan is doing good to get 23. something under these conditions, last tank it got 22.1 MPG.
    In town trips for me rarely are faster than 35 mph, or longer (one way) than 3 miles.
    I'm supercharged now, and still somehow manage 26.5MPG. That's mainly "normal" driving, with probably 7-8 WOT pulls to redline in 3rd gear.

    Mine will probably worsen though, when I finish the tuning process with Vit.
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  9. #7
    Truck? What truck?! scottyrocks's Avatar
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    Quote Originally Posted by Teeps View Post
    How some here are getting 26 MPG or more in town continues to baffle me.
    My '12 sedan is doing good to get 23. something under these conditions, last tank it got 22.1 MPG.
    In town trips for me rarely are faster than 35 mph, or longer (one way) than 3 miles.
    My '12 LX 5AT averaged 23 to 24 in city (stop-and-go) driving most of the time. I got a high of 42.5 on a highway trip once. Usual highway was about 36.

    My '15 LX 5MT regularly gets 28 city/33 highway under the same conditions. The only difference is the transmission.

    Is yours an Si, Teeps?
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  10. #8
    One Bad Mama Jama!!!
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    Quote Originally Posted by Teeps View Post
    Agree, but I have to wonder what is worse:
    a front engine under cover plate that is missing
    or
    a front engine under cover plate that is mangled or detached in the front

    How some here are getting 26 MPG or more in town continues to baffle me.
    My '12 sedan is doing good to get 23. something under these conditions, last tank it got 22.1 MPG.
    In town trips for me rarely are faster than 35 mph, or longer (one way) than 3 miles.
    Yeah I only get like 22-24 somewhere in btwn. I blame the traffic.
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  11. #9
    One Bad Mama Jama!!! ampm1678's Avatar
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    Quote Originally Posted by boosted180sx View Post
    Yeah I only get like 22-24 somewhere in btwn. I blame the traffic.
    I get around 20-21 MPG in the city as well...its horrible and its also why if Im just going a few blocks over from my building and I can help it to leave the car at home I do so and instead just walk...I try my best to only use my car when I have to go out of the city to visit family or old friends who live outside of the city as well but that's not always possible because it's murder walking home with heavy grocery bags.
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  12. #10
    Nooblets CivicGuy84's Avatar
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    My undercarriage panels were collecting snow and ice and ended up filling and dragging on the ground everywhere I went. They had to come off. Just my $.02
    My engine makes an odd sound... The sound of saving money!
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