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Originally Posted by choaderboy2
It works for street cars, some Nismo suspesion packages like the Altima and Maxima are tuned like this as is the C6 vette.
You want the bob of the front and rear to cancel out within 1/2 cycle of your target speed. I use 70-80 mph or so for a race car. Street cars use 50-60 mph or so.
A LDPT is a linear varible resistor on a rod used to datalog suspension movement with a very high resolution. I have the data logger but the buggers are expensive. I have some string pots but they don't have the resolution to do what I want to do next, looking at the distribution of shock piston velocity over time.
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So whats with the big rear sway bar you had been developing? I would think you'd be going with a bigger front, not rear now.
How do I actually calculate this stuff? I started messing around with some equations but I'm not sure if what I've come up with means anything. I figured tune for 60 mph, which is 88 feet/sec. Wheel base is 95.7 inches, so at 60 mph the time difference between the front and rear hitting a bump is .090625 seconds. On a tech paper on optimumg, it said a typical ride frequency is 1.5 to 2.0 hertz on a race car. I used 1.5 hertz for the front, then used the mathematical description of a wave (Acos2pi ((x/lamdba)(t/T)) ) to calculate the time the wave takes to cross the x axis (1/2 cycle). From what I can tell it doesnt matter what you use for wavelength or amplitude (because x is going to be half of the wavelength so you always get .5 for x/wavelength). I came up with 1/3 of a second for t. 1/3 minus the .090625 I found earlier equals .2427 seconds. Thats the time you need the rear to cross the x axis, so multiply that by two gives you the period, and one over that is the frequency, which I get to be 2.06. So, with a 1.5 hertz front ride frequency I get a 2.06 rear. Am I even close to being right on any of this?
