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Consensus on big bar/soft spring?
I'm trying to make a decision whether I want to go big bar/soft spring, or soft bar/stiff spring. From the research I've done, I've mostly found articles pertaining to late model asphalt cars rather than autocross. From what I can understand, soft springs are good for rougher surfaces(parking lots for autocross?) and making the tires work. I intend to run c prepared(slicks) and maybe a few 200tw events. Car will be 80% at track, so ride quality is of little concern. It seems as though BBSS requires different geometry(less camber change) to accommodate increased dive, and more testing/tuning to setup, is this true? I understand its a subjective question, but which setup is best for my application?
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So one isn't faster than the other? Why are more people switching to a BBSS setup recently?
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There is a big long explanation as to why that Ron Sutton I'm sure could explain better than I, but in a simple form...having a high travel setup lets one configure the geometry to work best in all areas of a turn and the straights as well.
With a super stiff spring setup, the static geometry is what it is pretty much all of the time. You dial in camber to help the outside front tire contact patch, but completely give up the contact patch on the inside front tire. With a front suspension that travels, you can maximise the contact patch on both front tires in a turn. Aren't two tires gripping better than one? Watch this video to see how well a soft spring\big bar setup helps make a G-Body turn. |
point definitely taken, but could you not compensate for the stiffer spring rate car by making the dynamic camber change larger for a smaller distance of travel?
Another thing I just thought of, since I intend to run c prepared and I intend to get the car as low as I can, would running a softer spring rate and higher travel limit my static ride height setting? |
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I'd like to suggest you look at it a different way. We don't care where the CG is when the car is sitting in the pits. We care where the CG is out there in turn 6 ... just before turn in. :cheers: |
:idea: ohhhhhhhhhhh
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It is/was pretty common to set-up a car low, with the crank centerline (at the balancer) at 12" above ground "to get the mass low". Then with a stiff front spring set-up, the car may travel (compress) 1" ... so this mass is 1" lower with the crank centerline at 11". Modern, high travel set-ups, may place the crank centerline at 13". Then travel the front end 3" to 4.5" under braking, before turn in. That puts the crank centerline at 8.5" to 10" depending upon the travel strategy. If we put that mass at 8.5" ... the cornering speed capability compared to it being at 11" ... is a significant difference. All things being equal ... contact patch, car weight, track width, optimized spring & bar rates ... the car with the lower CG can carry significantly more speed. The other bonus is, the front end is loaded more from static load transfer of the front end being 3"-4.5" lower. This is in addition to the dynamic load transfer from braking g-forces. Lastly, combined with the strategy of running the car flatter (less roll angle) increases the loading on the inside front tire ... increasing it's grip ... adding to the total grip the front end has. We can't go faster through a corner than the front end has grip. That needs to be our focus. Running a low roll strategy ... say 1° ... keeps the inside tires loaded more than a high roll strategy around 3°. Make sense? :thumbsup: |
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See... Just like I said... http://www.winstonsalemskyscrapers.c...ngemoticon.gif
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im in it for the looks. |
It all makes sense, like most of your posts though I need to digest it to be able to apply it :headspin:
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Listening to anyone other than A 6 time CP National Champion would be rather pointless.
Therefore, contact Mike Maier of Mike Maier Inc. He's leaving for Wisconsin tomorrow for Optima Event at Road America but will be back in the office on Tuesday. He'll then be leaving again later next week fo the SCCA solo National in Lincoln Nebraska where if he wins, he'll hold the record for most overall National Championships in CP with 7. Right now he's tied for the most. |
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Auto cross road course and street all tune different. In my opinion Auto x is a completely different animal when it comes to tuning and suspension design. With the technology in chassis rigidity, shock tuning, shock valving and accurate spring rates going on now you can get away with less bar. Let your geometry work. |
I totally agree autocross setup is different than any other form of Motorsports.
Ron, how many SCCA autocross nationals champions are using your setup or advice? Who? Scott Fraser |
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big bar/soft spring?
for me...I run my 68 Camaro with 800 lb front springs and the DSE sway bar...my upper control arms pivot point has been moved from stock (modified Guldstrand) and that creates a jacking effect so essentially my car is in camber moment at all times...the lower control arm has the shock mount moved closer to the ball joint than standard arms....and the triple adjust front shocks i have run a digressive piston....on the rear I run a 325 spring and the triple adjust rear shocks i have run a digressive piston, I use the Helwig Protour rear bar....the weight of my car is 3150 with full interior, radio, heater and Cage the engine is a 6.0 LS..... my set up is big bar/medium spring hope that helps |
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Also, Mike took his "autocross" setup to Sears Point for the Shelby Nationals and was in the top 5 of times but was the only one in the top 5 on a 200tw tire. So, in my option autocross, road racing and street driving can all use the same suspension settings. |
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Berate how? He simply asked a simple question as to who is national competitive in an autocross environment running his setup. |
:tv_happy: :catfight: :lmao:
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Having dialed in a couple Solo I, Solo II, drag race and big track high speed turnie cars in my day I'll stick to my opinion. None of which were National Champions or Saviours of Nazereth mind you but most improved over base. :captain1: |
Chetly, your fanboism always comes off snobbish and rude. Mike is a smart guy, anyone that has talked to him knows that.
Your advice is good though. If I wanted a CP Mustang, Maier would be the first call I would make, but it wouldn't be the only homework I did. |
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Fanboism? I'm just stating facts that I know as true. Yes, Mike and I are good friends. So what. That's not fanboism. |
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I don't understand how people call me a fanboi for recommending talking to Mike when the OP originally asked about suspension for a class that Mike has dominated for the last 8-10 years.
Yet, when people recommend Ron Sutton for anything that's perfectly fine. Sounds like there is some people around here are fanbois of Ron as well. To each their own... |
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:catfight: :lmao:
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I had to take a step back and make sure I wasn't on C-C or AR15.com. That's some good stuff Chet. :lol: We have all done business with Mike Chett and value his knowledge but WTF, should we just push all of our tool boxes and cheat sheet into the bay? Im gonna quote you as much as I can so you can stop back peddling with this editing. |
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Don |
Chetly, please man. Everybody knows Mike and loves him. We know you do too.
Making an argument in your favor by knocking another is simply deflection from the real issue being discussed. My high school girlfriend taught me that. What are we fighting about, err discussing again? :military: |
'arrogant nut hugging leg humper' :lmao: :lmao:
Mind if I borrow that sometime Don? |
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Everyone knows I'm running a tempered version of a big bar soft spring setup and while I don't have any National titles under my name yet, I have had more than 1 multiple time national title holders mention to me after watching my car run in person that my car is faster than it should be.
Does that count? :stirthepot: I also don't believe that Ron is the only one using this type of setup. Watch a Cup car run at just about any small track or road course and watch the front suspension for more than just a couple laps then get back to the class here about what you see going on. That doesn't mean that a big spring soft bar setup is wrong either, it's just a whole 'nother animal. If someone wants to run it, I say go for it. Nobody is holding a gun to anyone's head. It'll be settled out on the track...eventually. |
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