Downforce Comparison.
Downforce Comparison.
Just ran search using this title, didn't reall find anything, just a few views on the Beatuth undertray. Is there any comparison for the downforce of the Evo aftermarket products?
I don't think you are going to have much luck finding that information. I have been doing so much reading on aero lately and never realized that the EVO8-9 doesn't even have an advertised drag coefficient. The closest thing I can find is from the EVO7......
Let me know if you find something. I am curious myself as I am working on some of this stuff.
Let me know if you find something. I am curious myself as I am working on some of this stuff.
by NO means am I an aero expert, but generally lowering a car reduces the amount of air forced underneath it which reduces the drag. That's about the only part of aerodynamics that makes sense to me. Otherwise I still can't figure out how a lexus ls430 is more aerodynamic than a vette...
well there is drag co and frontal area.
"Otherwise I still can't figure out how a lexus ls430 is more aerodynamic than a vette..."
iow a semi might have a drag co of 40, same an old VW bug. but the frontal area of a semi truck is pretty much bigger. way general numbers, don't dissect them.
every one has read the old story bout the Porsche designers that had the perfect aero but the bean counters made them flip the front to the back on the 924.
pretty silly I know but the truth is, the *** end should look like the trailing edge of a wing and the front like the front end of a plane. not going to happen is it.
I saw your post Dave about filling in the holes in the front bumper, should help and doesn't have to be to smooth to "work".
For the rest of you designers a bumper that looks like a shark's head would do wonders, but sooner or later the bits and pieces stick out and you end up back where you started. practicality and reality foil many a dream.
about the best one can come up with is reducing the cup like section of the back bumper, and cutting off the turbulence off the upper back end. a hatch back would be worlds better, maybe run Plexiglas from the wing to the rear of the roof.
see what I mean about reality?
"Otherwise I still can't figure out how a lexus ls430 is more aerodynamic than a vette..."
iow a semi might have a drag co of 40, same an old VW bug. but the frontal area of a semi truck is pretty much bigger. way general numbers, don't dissect them.
every one has read the old story bout the Porsche designers that had the perfect aero but the bean counters made them flip the front to the back on the 924.
pretty silly I know but the truth is, the *** end should look like the trailing edge of a wing and the front like the front end of a plane. not going to happen is it.
I saw your post Dave about filling in the holes in the front bumper, should help and doesn't have to be to smooth to "work".
For the rest of you designers a bumper that looks like a shark's head would do wonders, but sooner or later the bits and pieces stick out and you end up back where you started. practicality and reality foil many a dream.
about the best one can come up with is reducing the cup like section of the back bumper, and cutting off the turbulence off the upper back end. a hatch back would be worlds better, maybe run Plexiglas from the wing to the rear of the roof.
see what I mean about reality?
David what cd did you find on the VII? Also if someone could rent one of those windtunnels you see in lots of tv ads what would you think it might cost? I remember years ago in Road and Track about a Fiero and comparing the base model to the more sporty with more aero parts and lower stance and the cd dropping from .34 to .30 or something. Is it a fair assumption that the IX or VIII would benefit a similar drop in cd being lower with springs or coilovers? I know that on my 1G it felt like there was a little less throttle required at speed on the highway after I put new spring/shock combo on it. I too am very interested in aero.
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by NO means am I an aero expert, but generally lowering a car reduces the amount of air forced underneath it which reduces the drag. That's about the only part of aerodynamics that makes sense to me. Otherwise I still can't figure out how a lexus ls430 is more aerodynamic than a vette...
Uh, in case you guys didn't look at rotation2.jpg in the other thread I linked, the Cd for the IX is 0.38. I believe the Cd on a F1 car can be over 1.0..... 1.3 seems to stick in my head for some reason. I guess that's what happens when you create 1600lbs of downforce at 100mph 
FYI... At hatch back is worse aerodynamically than its sedan counterpart. You have much worse separation on the back end of a vehicle with a hatch. The drag coefficient incorporates the shape of the front and rear of the vehicle.
yes, a hatch is bad but the sloping rear windshield is worse. It is to steep for the airstream to stay attached so turbulence starts there and then is compounded by the back of the car. The wing is Trying to get some clean air but is compromised.
Now, when you get to the back of the hatchback you have an enormous problem, relatively speaking, but up until that point the airstream should be very good.
At the end of the hatchback one incorporated a spoiler that "cuts" the airstream in an Attempt to keep the air from being towed in the low pressure behind the car.
There is no doubt the best rear for a car would be one that skinnys down to a wing like point. A hatch back is that general shape with the last twenty feet chopped off.
I guess you could do the same thing at the rear of the evo roofline, with a spoiler, but at that point you have that much greater a chopped off area to fill.
By sloping the rear window gently you allow the airstream to come to a lower point before it is destroyed by the end of the car.
could be wrong but I'm sticking to it.
Now, when you get to the back of the hatchback you have an enormous problem, relatively speaking, but up until that point the airstream should be very good.
At the end of the hatchback one incorporated a spoiler that "cuts" the airstream in an Attempt to keep the air from being towed in the low pressure behind the car.
There is no doubt the best rear for a car would be one that skinnys down to a wing like point. A hatch back is that general shape with the last twenty feet chopped off.
I guess you could do the same thing at the rear of the evo roofline, with a spoiler, but at that point you have that much greater a chopped off area to fill.
By sloping the rear window gently you allow the airstream to come to a lower point before it is destroyed by the end of the car.
could be wrong but I'm sticking to it.