I ended up with 14k springs in the front. I am starting to regret it as I think it is too stiff, I probably should have gone with 12 and
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12-10-2013, 03:39 PM | #1 (permalink) |
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I think I am regretting my spring selection
I ended up with 14k springs in the front. I am starting to regret it as I think it is too stiff, I probably should have gone with 12 and a big bar instead of 14. What do u guys think
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12-10-2013, 05:05 PM | #2 (permalink) |
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Personally, yes. WO aero 14k is kinda stiff. The OEM setup has a wheel rate of about 167 in the front and 146 in the rear.That calculates out to a a ride frequency of about 1 with a 15% difference front/rear.
14K frontis 300+ wheel rate and a >=2.0 Hz ride frequency which is definitely above or at the upper limits of where a non aero sedan type car should be. as a general guideline: 0.5 - 1.5 Hz for passenger cars 1.5 - 2.0 Hz for sedan racecars and moderate downforce formula cars 3.0 - 5.0+ Hz for high downforce racecars So unless you have a pretty significant splitter, you might want to tone it down.(Or buy a splitter!) Check this link out http://www.optimumg.com/docs/Springs...Tech_Tip_1.pdf
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12-10-2013, 06:11 PM | #3 (permalink) |
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I violently disagree with the frequency guidelines above. You won't find a formula car with 1.5hz frequencies on planet earth. Most GT based race cars are 3hz+ and formula cars are over 4. 14k is not all that stiff in reality.
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12-10-2013, 09:56 PM | #5 (permalink) | |
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Quote:
In a nice flat Auto X environment I can see the point. 14K spring with a corner weight of ~800 lbs is pushing the limit of tire compliance and would only be good on a very smooth flat surface-like auto X or tarmac. You will not be getting enough bump travel to ensure tire compliance. I don't know the math on bump stop rubbers, but proper bump stops is probably a better answer than 18K springs whether on tarmac or corner 6 of Big Willow.
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12-10-2013, 10:21 PM | #8 (permalink) |
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waiting for the rest of the car's suspension specs before i give some input.
but in my opinion, a 370 on wide front tires at a good pace, 14kg isnt outta the question, but the damper needs to be up to snuff |
12-10-2013, 10:22 PM | #9 (permalink) |
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Well then I apologize on believing in basic math. A small note though, if your front right tire is 8+ inches off the ground, you suspension is probably not tuned right and you need to reduce your spring rate. TY for proving my point with your photo demonstrating a terrible suspension.
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12-10-2013, 10:37 PM | #10 (permalink) |
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I find this bordering on hysterical, but do carry on...
..it is "jacked" up because he hit a bump at 50mph while accelerating out of constant radius corner. Same corner: Last edited by 03threefiftyz; 12-10-2013 at 10:39 PM. |
12-10-2013, 10:42 PM | #11 (permalink) |
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Also, although I don't agree with Dennis Grant at all on set-up, he does supply an easy to use dynamics calculator on his website...
Autocross to Win (DGs Autocross Secrets) - Dynamics Calculator |
12-10-2013, 10:53 PM | #12 (permalink) |
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Just out of curiosity, I looked up what a bog standard 996 GT3 cup car came with for springs....1200lb on front, with a strut.....on car with no weight on the front wheels. Then again, I am sure the fine folks at Porsche motorsport are just plain stupid and haven't discovered the internet knows all.
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12-10-2013, 10:54 PM | #13 (permalink) |
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I'm just trying to think of that race where the winner had two wheels off the ground. Oh yeah now I remember, the Dukes of Hazard, those guys were fast! I bet they were using like 5000Hz wheel rates to get away from Boss Hog!
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