Results 1 to 4 of 4

Thread: Best ratio of front and rear downforce???

  1. #1
    Lepton
    Join Date
    Feb 2011
    Posts
    344
    Country
    United States

    Best ratio of front and rear downforce???

    I'm undertaking a project to put some real wings on my Atom. I'm working with Circo Design, which does the aero for many of the SCCA national champions in autox. http://cirodesignracing.com/CiroDesignRacing/WING.html

    The one big question we have is what is the right downforce balance between the front and rear of the car. IE if I have a wing in the back that is giving me 500lbs of downforce at 100mph, do I want 200, 300, 400, or 500lbs up front? Anyone with a lot of experience/testing have any thoughts? I think you could also use downforce to help with cold tire understeer on cold tracks and morning sessions as well.

    Also, is there anyone that would be interested in a serious wing setup for their car? I would think we could do a full solution to get you very clean aero adjustible from able to support very high speed tracks to a very high downforce setup for autoxing. Depending on what it costs to fab the mounts, I bet it could be done for around half of what Ariel/TMI charges, and a lot more effective.

    Jason
    2011 Ariel Atom Not Supercharged
    2006 Range Rover Sport Supercharged

  2. #2
    Neutron
    Join Date
    Aug 2010
    Posts
    2,677
    Country
    United States
    I dont think we really know. We have one official wing with a few reports of improved lap times and just the computer modeling that Brammo did when they designed them. No one has done any solid testing.

    You may need to ramp up the spring rates for that kind of downforce too

  3. #3
    Lepton
    Join Date
    Feb 2011
    Posts
    344
    Country
    United States
    Quote Originally Posted by bolus View Post
    I dont think we really know. We have one official wing with a few reports of improved lap times and just the computer modeling that Brammo did when they designed them. No one has done any solid testing.

    You may need to ramp up the spring rates for that kind of downforce too
    I really have no idea what would be optimal downforce for the car. I think the front of the car is free downforce becuase the drag is going to be absorbed by the chassis anyway. If it takes 10hp to offset the drag loss of a rear wing at 120mph, is that going to lower lap times? I don't know

    My goal of the project would be to make the car safer on the street with a fairly agressive angle of attack (20ish degrees) to give me optimal downforce numbers around 50-60mph, but the ability do drop the wing all the way down to 10 degrees or so for big fast track days.

    Good point on spring rates, I'd have no idea how much I'd need to come up. I do know from talking to TMI that they do see measurable squat on their test mule with the factory wing setup.
    2011 Ariel Atom Not Supercharged
    2006 Range Rover Sport Supercharged

  4. #4
    Neutrino MadMaxAtom's Avatar
    Join Date
    Apr 2011
    Location
    Usually in my shop..
    Posts
    1,583
    Country
    United States
    I have to rely on my butt-o-meter...which tells me after experimenting with no wings,one wing and both wings..both brammo wings are helping at speeds over 90mph...enough to want them on the car.

    ...and it feels like more downforce would be even better...but not tons more... and the wings can't look like shit.

    I believe 2-300lbs on the nose and 5-600 out back would be ideal for Max's current suspension setup and tire combination..depending on the track and conditions. That would load the suspension and tires nicely...from what I have measured. ( I currently run 300lb springs up front and 550lb out back on custom built Moton shocks and Palatov rockers/pushrods/spindles.)

    I am wondering what the addition of the windshield is going to do to the feel of my Doc Atom at 100+ mph.,as it looks like it could be dumping a lot of dirty air on the back spoiler,..don't know for sure without a wind tunnel..and that's not happening. Long wait till spring...
    Last edited by MadMaxAtom; January 27, 2012 at 08:32 PM.
    The power of an Atom is a terrible thing to waste! Atom owner/operator since 2007. The more you chase perfection,the faster it becomes. John Force for President! (I asked him once in person...he laughed)

Similar Threads

  1. rear wing mount
    By bolus in forum Build Projects
    Replies: 90
    Last Post: January 7, 2014, 05:09 PM
  2. Wide Rear Fenders
    By ub2slow in forum General Ariel Atom Discussion (for all UK and US versions)
    Replies: 16
    Last Post: June 5, 2012, 08:21 AM
  3. If I were to build a downforce body for the Atom
    By Payne in forum General Ariel Atom Discussion (for all UK and US versions)
    Replies: 8
    Last Post: December 19, 2011, 05:31 PM
  4. APR aluminum front (or rear) wing foils.
    By bolus in forum General Ariel Atom Discussion (for all UK and US versions)
    Replies: 3
    Last Post: July 26, 2011, 07:30 PM
  5. Rear hub shaft tapered
    By RyanD in forum US Ariel Atom 2 (Brammo) Technical Discussion
    Replies: 3
    Last Post: July 15, 2011, 04:44 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •