Nissan Altima REAR wind diffuser/belly

[Compaq888]

Before I went to sleep I came up to the car and the whole left side of the bumper the tape came off. So I redid the whole bumper with like 3 layers of tape. It better not come off or I'll do 10.

[Compaq888]

I have the mpg results. I added 2 psi to the tires and that is with the belly.

I drove 69.1 miles on 1.784 gallons of fuel = 38.733 MPG

Before I got 32-33mpgs. Also my fuel gauge barely moved.

[JanGeo]

WOW now I gotta do my rear pan on my xB - tape is not permanent and will always let go - a really heavy sticky shipping tape may work better that duct tape until it gets wet a few times. Better to tuck the rear edge above the bumper if you can then secure the leading edge with bolts and nuts.

[RGR...]

Originally Posted by JanGeo

Better to tuck the rear edge above the bumper if you can then secure the leading edge with bolts and nuts.

Good idea, or I was thinking some sheet metal screws. Possibly
use some of those padded washers, and screw the plastic bumper
material down tight against the belly pan. Nice Work Compaq!

[Compaq888]

Just a warning to you guys. Tape and the metal won't last long. My tape is holding on for dear life and the metal is bending. I'm going to try to fix it today. There is just too much force on the metal from freeway speeds.

[kickflipjr]

Rivits would be much better. Thats what i will use if i ever make one

[JanGeo]

Yeah you have to figure the area that is exposed to the air flow - the bigger it is the more forces are on it. That's why I recommend fastening the leading edge well so that back end can blow out adn still be connected to the chassis without the leading edge scooping in more air. I am thinking some glass and epoxy over mine to strengthen the foam board and giving it a lot of open space on the sides to allow air to flow across it and cool the muffler. Time for a "before" shot while the camera is all charged up and the sun is shining. It can be so embarrasing when a chunk of your car falls off on the highway!

[RGR...]

Originally Posted by kickflipjr

Rivits would be much better. Thats what i will use if i ever make one

Yeah, rivets would be best. BUt I'd still use screws while testing,
then rivets for the final install. If you are like me (and compaq apparently)
it will be on and off there several times!

[Compaq888]

The belly keeps coming off. It doesn't matter how much tape I use or where I use it, it keeps coming off.

There are 2 possibilities...
1) too much wind
2) the metal piece is too heavy for the tape

I can't put rivets or screws because I plan on selling the vehicle.

[SVOboy]

Who's going to notice a screw hole in some plastic under the car?