Once again, we already concluded this and I'm not removing them. lol

 

BS.
Those things give little to no effect. If effect would have been so significant then Nissan would have installed those on every equally powered G35 and not only on the one that comes with a spoiler.

Two years ago I took a trip down to Florida from Washington, and I averaged 25mpg. So I can easily argue that removing them I got better mpg. The car is only rated for 21

 

yeah aerodynamics have no effect on mpg. Thats why auto manufacturers spend billions on there cars to make them as aerodynamic as possible. Improved aerodynamics reduces drag, helps with acceleration, improves mpg, help with high speed stability and reduces lift to allow higher speeds.

Just look under a m3 or AMG car. Almost every component under the car is covered and has a function. Those cars are designed for go up too 186mph or higher depending on the model. At higher speeds, every little bit helps.

Your florida to washington argument is wrong because gas mileage is dependent on many more factors such as air temp, air pressure in tires, roll resistance of the tire, your road elevation, your throttle position as your drove, your average mph as your drove that distance.

You can easily get 55mpg if you go 55mph in 6 gear the entire trip on the highway. With your logic then i can say my g35 is a 55mpg car even though its rated for 28mpg hwy.

Only real way would be to do wind tunnel testing to see if those pieces actually have any effect on aerodynamics.

 

Thing is, Nissan/Infiniti already did this. The Aero package (rear spoiler plus underbody diffusers) "reduces overall lift to ZERO and lowers the drag coefficient to .28" (from .29).

So we get a little bit lower CD, plus zero lift. Yes it is a small benefit, but it is still a benefit. How many of us tweak our cars looking for a slight edge? If it didn't make a difference, I'm sure Infiniti would have been happy to sell you just a spoiler, called it an "Aero Package" and saved money by not giving you the diffusers.

I'll take small benefits that add up. Look how many people want a Z-tube plus a Revup airbox - not a big difference, but still has a small perceived benefit.

People can argue both sides till we're blue in the face, but the truth is these pieces serve a function (admittedly small) and those who take them off, or bought an Aero Package and tossed the diffusers are just pissing away $80 worth of parts.

 

TemjinX2. I'm sure those things are a vital component on your car.

Last thing we all need is for you to become airborne and fly over all that LA traffic just cuz you did not put them important diffusers on.

 

^

People, the pieces we are discussing are practically useless. If we were discussing an Enzo here then it would be a different story.

 

It makes a difference but will you notice it?

It's the same as driving on the FWY with the windows slightly down.