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Thread: Aero for low speed tracks.

  1. #1
    Senior Member ayon's Avatar
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    Default Aero for low speed tracks.

    I have compared video that i have running a 1:22.4 on streets of willow driving very conservatively with a 4" splitter and a 65" rear wing in Jan.

    Things that have changed from may 2nd's 1:25.2 compared to my Jan 1:22.4;

    Went from xp10 front/oem rear pads to xp10 front/dtc-60 rear pads.
    Removed wing/Splitter to run mod class in the Corvette Challenge.
    Removing the splitter/wing saved 12lbs for splitter and 14 for wing.
    I Removed 45 lbs out of the top of the car by fabricating a rear clam shell out of FRP/and ABS plastic.
    Removed another 17 lbs by fabricating a FRP top.
    weather was 6 degrees cooler in Jan.
    My Jan 1:22 was passing a car, my 1:25 was with no traffic.
    Summary is i ran without aero but lost lost 36 lbs.

    Here is a video of my 1:25.2 on may 2nd which I ran with no traffic.

    [YOUTUBE]http://www.youtube.com/watch?v=yD0HaWPmmwA[/YOUTUBE]

    I Immediately noticed i couldn't come within 5 mph of what i could with aero off the front straight and the left sweeper before the bowl. Everywhere else was an inability to put power down as early as i could with the rear wing.
    I actually went off turn one 3 times, the left sweeper before the bowl and the bowl once, I guess i got used to the aero.
    Last edited by ayon; 05-07-2010 at 09:26 PM.

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    Senior Member bellwilliam's Avatar
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    I will take a crack at it.

    Aero is worth about 1 sec. Ive done back to back test on that. It would help u on T1 and the double sweeper before the bowl and the chcane.
    I was there on saturday. Wind was definitely an issue. Not sure on sunday. But headwind going cw will definitely slow you down overall. Thats worth close to 1 sec.
    Weather would account for most. Another second. It might be 6 degree delta on ambient air. But it has to do with track surface temp also. Most track records are set in winter. At least in socal.
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    LongWinded National Champ Bueller's Avatar
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    So you were over 3 sec faster with the aero? I have no experience with aero, so i cant provide any feedback. But one thing that does come to mind that many people forget about/overlook...driver comfort. If you want to get a better idea id say do a few weekend events. One day with aero, and one day without.
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    Chest hair required Olitho's Avatar
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    Tires!

    I have swapped tires and picked up four seconds on a 2.5 mile track when nothing else was different.


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    Senior Member sks's Avatar
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    Interesting observation. Thanks for sharing.
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    No Turbos Needed FLZ_Boy's Avatar
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    For Sunday, we didn't have too much headwinds, but it did get warm during mid-day. Most people were off about 1 sec from their fast lap times compared to the first 2 sessions.
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    This makes perfect sense to me.. with the low speed and SOW mostly being turn after turn.. I can see how aero would make a bigger difference in time here vs. a high speed track with more straights like big willow.

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    Post-College Racing Sloth hikickracing's Avatar
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    Is the s2k in the picture what you drove?
    With that front dam and the sloped rear, I am sure your aero package works much more efficiently than your typical splitter and wing. Anything under the car?
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  9. #9
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    Tires, conditions, and lack of aero are more than reason enough.

    I know somebody who did back to back testing in an AP2 S2000 (Voltex rear wing). It was worth 2.5 seconds @ streets.

    Generally speaking, the lower the average speed, the more aero you can get away with.

    Look at Monaco, they run the biggest elements of the season, also has the lowest average speed. Conversely, look at SPA, cars very trimmed out, and it happens to have the highest average speed.
    Last edited by Dino Antonov; 05-09-2010 at 11:44 AM.

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