build full under tray and diffuser
Hopefully, it will come to fruition. Many people over the years have fantasized (not saying the OP is fantasizing) about a full under tray but nobody ever made one.
those pictures i promised to post yesterday but forgot. you can see how low the exhaust hang to the body of the car 
last picture its of 2008 viper our vent inspiration
last picture its of 2008 viper our vent inspiration
Another thing to take in is that this will also create a center of gravity in the down force that might have to be adjusted to balance out the car. I've been wanting to do a full length under tray also but just can't seem to find the time to start on it.
Last edited by 08NismoZ; Feb 16, 2012 at 08:43 AM.
I wish I could draw a picture to explain this much better, but that hump is actually a good thing. You don't want a completely flat under tray. In order to create the Venturi effect under the car which in turn will create suction, you can angle the under tray towards the ground at no more than a 7 degree angle. Once you've created your low pressure area then you can start the max 7 degree angle back up to the rear bumper. You can add in vortex generators at this back section also for even greater flow. I have a power point presentation from a class I took on the basics of motorsports aerodynamics that I'll see if I can attach here somewhere.
Another thing to take in is that this will also create a center of gravity in the down force that might have to be adjusted to balance out the car. I've been wanting to do a full length under tray also but just can't seem to find the time to start on it.
Another thing to take in is that this will also create a center of gravity in the down force that might have to be adjusted to balance out the car. I've been wanting to do a full length under tray also but just can't seem to find the time to start on it.
if the angle exceed 7 degrees what should i do ?
one of the tech suggested that the metal should be from the inside rather than out side and open vent in the middle of diffuser and place it bit back rather than at the end of the diffuser.
as far as me i'm looking at Varis diffuser and trying to duplicate it as much as possible.
any feed back would be appreciated
Last edited by 350z-900whp; Feb 16, 2012 at 10:39 AM.
The 7 degree angle you want is from the lowest point to the ground preferably as close to the middle of the car you can get it, to the very endpoint where the rear diffuser meets the rear bumper.
Here's a good pic of the underbody of the Ferrari Enzo that would be a good design to follow
http://www.the510realm.com/viewtopic.php?f=1&t=21559
It's like the fourth post down from the top
Here's a good pic of the underbody of the Ferrari Enzo that would be a good design to follow
http://www.the510realm.com/viewtopic.php?f=1&t=21559
It's like the fourth post down from the top
Oh you really don't want to exceed that 7 degree angle because the air flowing under the car then stalls, and no longer creates the pressure differentials you need to create suction.
Formula 1 engineers do a lift/drag analysis of every component that goes on the car. The higher the number the better it is for the car aerodynamically. The best piece on F1 cars that creates the most negative lift (downforce) is the undertray that they use to create this Venturi effect.
The front splitter is great for creating downforce on the front of the car also but that aerodynamic efficiency is lost once the air becomes so turbulent under the car.
Formula 1 engineers do a lift/drag analysis of every component that goes on the car. The higher the number the better it is for the car aerodynamically. The best piece on F1 cars that creates the most negative lift (downforce) is the undertray that they use to create this Venturi effect.
The front splitter is great for creating downforce on the front of the car also but that aerodynamic efficiency is lost once the air becomes so turbulent under the car.
