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The road to Optima Challenge 2021

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  • SuperBuickGuy
    replied
    Originally posted by mike343sharpstick View Post
    Brake fluid - I've been using a quality DOT4 from a newly opened container, keep it fresh.

    Love the flapper idea!

    http://driveusca.com/wp-content/uplo...0.6_final1.pdf
    The highlighted text are changes for this year. So you can do the same stuff as C3 Vettes from last year unless you see some highlighted text that has to do with something aero related.


    12.... GTS - any spoiler or wing configuration with a maximum of 6” tall from the highest point on the rear of the decklid or a maximum height of 4” above the lowest point of the rear window, whichever is less. The maximum width of the spoiler/wing must be no wider than the original panels of the car and must not extend more than 6” past the furthest point of the rear of the car. No wing may exceed 8” in chord length (front to back) at any point.

    13. Splitters and wickerbillsSplitters are unregulated in all classes. Wickerbills will be allowed on any wing, however, the maximum height of any wickerbill is limited to ” from any mounting point and must be between a 45 and 90-degree angle to the wing. Wickerbills on spoilers will be measured as overall spoiler height.
    fair enough, I can zip screw some sheet metal on (not going to happen)*. Of course, read what I wrote about the front-end-lift problem inherent in the C3s. I'm really hoping that by leaving the flat intake fully open and creating the lowest pressure possible behind the radiator that I don't need to get that creative... I'm also hoping I can get a moment to go flat out with this car before Optima - which is a challenge because nothing around here is paved, straight and closed. Another thought is close the area behind the lower lip and the firewall - thus forcing the air to either go up or out the sides.... but again, these are what people do to go from 98 to 99% not what people do who will get lost on the autocross course.

    *goals: fly under the radar with an interesting car/setup, own dead last without a DNF. I know I can compete, but at this point I need to start at the bottom and work my way up... that's my goal this year, solid foundation (and maybe not get lost on the autocross course).
    **next year goals: Outlaw, Wilwood Corvette Challenge, and any other of the rule-bending street car challenges like SCCA Solo events...

    Leave a comment:


  • mike343sharpstick
    replied
    Brake fluid - I've been using a quality DOT4 from a newly opened container, keep it fresh.

    Love the flapper idea!

    http://driveusca.com/wp-content/uplo...0.6_final1.pdf
    The highlighted text are changes for this year. So you can do the same stuff as C3 Vettes from last year unless you see some highlighted text that has to do with something aero related.


    12.... GTS - any spoiler or wing configuration with a maximum of 6” tall from the highest point on the rear of the decklid or a maximum height of 4” above the lowest point of the rear window, whichever is less. The maximum width of the spoiler/wing must be no wider than the original panels of the car and must not extend more than 6” past the furthest point of the rear of the car. No wing may exceed 8” in chord length (front to back) at any point.

    13. Splitters and wickerbillsSplitters are unregulated in all classes. Wickerbills will be allowed on any wing, however, the maximum height of any wickerbill is limited to ” from any mounting point and must be between a 45 and 90-degree angle to the wing. Wickerbills on spoilers will be measured as overall spoiler height.
    Last edited by mike343sharpstick; March 23, 2021, 09:15 AM.

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  • SuperBuickGuy
    replied
    Originally posted by silver_bullet View Post
    Just thought it might help with controlling the amount of air getting under the beast....
    C3 corvettes are bottom feeders - the forward facing grills are mostly decorative - and that's the aero conundrum the air turns and creates pressure under the front of the hood pushing more air up... not necessarily alleviates the problem and actually could make it worse*. The fix is use a 81/82 nose (which is why you see them on early C3s).. you know, the ant eater nose... if I were to really get clever, I'd make bottom doors that open at low speed but close tight at 40 or so mph because the front grills would be adequate at speed...

    *there have been some interesting/clever solutions such as a shorter, thicker radiator, mounted vertically because the way the radiator is mounted (at an angle) only makes the problem worse
    Last edited by SuperBuickGuy; March 23, 2021, 07:33 AM.

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  • silver_bullet
    replied
    Just thought it might help with controlling the amount of air getting under the beast....

    Leave a comment:


  • SuperBuickGuy
    replied
    Originally posted by silver_bullet View Post
    Would a pace car front spoiler knock you out of class?
    probably not, but the pace car spoiler isn't a splitter. And as a side note, the rear spoiler on mine is taller then a stock c3....
    Last edited by SuperBuickGuy; March 22, 2021, 09:40 PM.

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  • silver_bullet
    replied
    Would a pace car front spoiler knock you out of class?

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  • SuperBuickGuy
    replied
    Originally posted by pdub View Post

    I'm pretty sure you'll need to have some. But don't ask me, most of mine gets sprayed on the right rear wheel.
    maybe your Mustang is just marking its territory?

    Leave a comment:


  • pdub
    replied
    Originally posted by SuperBuickGuy View Post

    but... since you're here... teach me about brake fluid as it applies to Optima.
    I'm pretty sure you'll need to have some. But don't ask me, most of mine gets sprayed on the right rear wheel.

    Leave a comment:


  • SuperBuickGuy
    replied
    Originally posted by mike343sharpstick View Post
    Air control is important, It's amazing how much lift old cars produce. I assume you looked at the RideTech 48 hour corvette a time or two. A basic front and rear spoiler are relatively effective.
    Click image for larger version

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    this is another instance where I'm glad I'm going as a rank amatuer - I know it doesn't float at 137, and there really is no chance we're hitting anything north of that while amateur.

    my question has even more question marks - the rules state there's limited stuff you can do to make it better aero. I know the outlaw class can do anything they want, but my understanding was the splitter would be absolutely no go and the rear maybe (with several conditions).

    but... since you're here... teach me about brake fluid as it applies to Optima.

    Leave a comment:


  • mike343sharpstick
    replied
    Air control is important, It's amazing how much lift old cars produce. I assume you looked at the RideTech 48 hour corvette a time or two. A basic front and rear spoiler are relatively effective.
    Click image for larger version

Name:	mzV0DpPEZRYjPap.jpg
Views:	95
Size:	346.3 KB
ID:	1290516
    Last edited by mike343sharpstick; March 22, 2021, 09:26 AM.

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  • pdub
    replied
    Originally posted by 65RHDEER View Post

    I have the answer in metric, three digits, first one is a two, second one is a one, third seven.28.

    I have been faster on a public road, on a Hayabusa, it did it too easy!


    I have not been that fast on a public road. When I first got Red I had to take him out for a speed run of course. The guy had put brand new tires on Red so he could say Red had brand new tires when he sold him. I never even looked at the tires, all that I knew was that they were "new." I was lucky that wasn't my last ride in Red, at speed he was steering (or vaguely "aiming") like a V bottom motor boat in the wind. When I decided to run him at land speed I knew I had to have speed rated tires so I looked at his tires. They were speed rated T. On that run down the deserted stretch of interstate I had surpassed the speed rating for U.

    SBG, I have seen guys in fire breathing pavement shakers run autocross in the rain. They had the slowest time but they had the most fun and they put on by far the best show. Enjoy! Call it honing your driving skills.

    Leave a comment:


  • SuperBuickGuy
    replied
    I'm going to be exactly where I didn't want to be. A week from Sunday is my first autocross.... supposed to rain between now and then.... how annoying. I guess I don't care that much about getting the car wet (heck, it even has wipers that work).... but this in the rain will be a handful.

    Leave a comment:


  • SuperBuickGuy
    replied
    Originally posted by 65RHDEER View Post

    I have the answer in metric, three digits, first one is a two, second one is a one, third seven.28.

    I have been faster on a public road, on a Hayabusa, it did it too easy!


    my 'organ donor' phase of my life had a Honda VFR 750.... fastest I've ever been on wheels.... mph sounds impressive too at those speeds... but no 2 as the first number of that three digit set.... missed it by 3 mph.... then I pulled off the road and shook for 10 minutes... even then I thought that was nuts.

    Leave a comment:


  • 65RHDEER
    replied
    Originally posted by SuperBuickGuy View Post


    *for those who wish to calculate... 3.27 gears, 5600 rpm, 26.5 tire. I was scooting.
    I have the answer in metric, three digits, first one is a two, second one is a one, third seven.28.

    I have been faster on a public road, on a Hayabusa, it did it too easy!



    Leave a comment:


  • SuperBuickGuy
    replied
    Originally posted by pdub View Post

    Sooo..."1 of the 5 areas"... Is that laid out, like cones you have to go through at 150 mph? Or are you just on a big road course and high speed handling comes into play simply because it does?
    let's see if I remember them
    1) autocross
    2) braking
    3) engineering
    4) road drive
    5) track... I think run the track and get lap times but for novice, it's the ugly duck and its little ducklings playing 'follow the leader' thus it's just a gold star, not a time in that category.

    On the track portion, Randy Probst said they do the 'small track, not the scary big track' ... since there's nothing to hit but sagebrush, out there, not sure what denotes either.
    Last edited by SuperBuickGuy; March 18, 2021, 03:26 PM.

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