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compdrag · 09-27-2016, 03:58 PM

Ok so I'm going to lay this out. I have been researching this for awhile, and really only found one individual that did some testing on the performance end of this. So I decided since my rear bumper was trashed, and I could clean it up with a kit I got from ASP. I know a lot of you are going to say that this is silly and it doesn't work. I do have some graphs to post with this, and I'm currently testing what it will do MPG wise. If it does nothing that is fine because the bumper had a lot going on with it in the bad department.

Ok about the back of a 2002 Honda Civic Si with the bumper removed. It is shaped very odd with respect the way the body allows air to get into the rear bumper. With the holes I cut you can see where air will now leave the underbody and escape straight through the holes. Instead of hitting the bumper and then spilling out.

Ok onto these graphs Green is the run with a bumper with holes in it, and Blue is a bumper without holes. The car was ran up to 112mph(180KPH) which is not far off from what some people get for the north west states. 80MPH being a norm around here. The breakout for speed gained faster doesn't happen until around 66mph. But from an acceleration stand point could mean a lot on the highway if you need to boot scoot and boogie.

Acceleration Graph

Speed Graph

Now i'm not condoning high speeds on the highway, but I will say since doing the holes I have noticed a smoother ride at highway speeds, and a quicker get up getting there. I'm just now waiting to see what happens in the tank department. I had around 125 miles of all highway driving on the tank already when I did the install. This was the round trip plus some to go get the kit. So if I get extra out of this tank after the install it won't be from the highway driving. I drove the car to Montana and got only around 26-28 MPG but I wasn't taking my time either so I choke that up to no good data. But the past two tanks of just city driving has been 28.9 MPG.

So I will leave you with what it looks like and will keep you updated. I got it let the skeptics begin their commentary.

09-27-2016, 03:58 PM	#1 (permalink)
compdrag EcoModding Apprentice Join Date: Sep 2016 Location: Washington Posts: 107 24 Grom - '24 Honda Grom 90 day: 122.86 mpg (US) Clover - '61 VW Beetle Vert 90 day: 24.27 mpg (US) Thanks: 7 Thanked 48 Times in 32 Posts	The Holes! Ok so I'm going to lay this out. I have been researching this for awhile, and really only found one individual that did some testing on the performance end of this. So I decided since my rear bumper was trashed, and I could clean it up with a kit I got from ASP. I know a lot of you are going to say that this is silly and it doesn't work. I do have some graphs to post with this, and I'm currently testing what it will do MPG wise. If it does nothing that is fine because the bumper had a lot going on with it in the bad department. Ok about the back of a 2002 Honda Civic Si with the bumper removed. It is shaped very odd with respect the way the body allows air to get into the rear bumper. With the holes I cut you can see where air will now leave the underbody and escape straight through the holes. Instead of hitting the bumper and then spilling out. Ok onto these graphs Green is the run with a bumper with holes in it, and Blue is a bumper without holes. The car was ran up to 112mph(180KPH) which is not far off from what some people get for the north west states. 80MPH being a norm around here. The breakout for speed gained faster doesn't happen until around 66mph. But from an acceleration stand point could mean a lot on the highway if you need to boot scoot and boogie. Acceleration Graph Speed Graph Now i'm not condoning high speeds on the highway, but I will say since doing the holes I have noticed a smoother ride at highway speeds, and a quicker get up getting there. I'm just now waiting to see what happens in the tank department. I had around 125 miles of all highway driving on the tank already when I did the install. This was the round trip plus some to go get the kit. So if I get extra out of this tank after the install it won't be from the highway driving. I drove the car to Montana and got only around 26-28 MPG but I wasn't taking my time either so I choke that up to no good data. But the past two tanks of just city driving has been 28.9 MPG. So I will leave you with what it looks like and will keep you updated. I got it let the skeptics begin their commentary.