What you are looking for on dirt is rear steer. I began messin with the theory in 2003 on Legends adapting sprint car chassis technology and big soft rear tires, simulated to a Legend chassis. You hear a lot about soft right side springs... lol sprint cars have a huge soft right rear tire number one. Number 2 you cant take a setup similar to a modified or a late model and apply it to a Legend because of the huge weight difference and adjustability of their chassis, you will have a rough riding handful of what the heck is upsetting this chassis. Here is the skinny as compared to a light weight chassis. How soft you can go on the right rear depends on driver weight and added lead weight (plus where it is mounted) to the chassis on the rear which effects the roll center. Yes you want the chassis to roll over on the right (many think it is for side bite but that is not the goal). The goal is to maintain the right rear control arm level and have it stay level while cornering. This retains max wheel base on the right side. Your heavier rear spring should be on the left rear. That forces the left rear control arm downwards and shortens the wheel base on the left side yielding rear steer during cornering plus maintains weight on the left rear tire tread for grip. 2 or 3 years after I found this works awesome on dirt, I seen dirt modifieds and late models going to light right side springs. Those babies really lean right these days compared to the same chassis racing in the '90's. Beauty of those chassis is their rear control arm adjustability at the forward mounting point (able to move them up or down to control chassis set-up on heavy or dry slick tracks without changing springs). In this aspect what they call 'getting up on the bars' while cornering is limited in Legends as they have a fixed forward rear control arm mount (non-adjustable) in which even my sprint car chassis have as a luxury. Legends only have 2 link rear suspention where thiers have 4 link rears which allows them even more adjustability and rear response yet, over a Legend's limited travel and 2 rear control arms. A lot can be gained by rear tire stagger and tire pressures as well as long wheelbase base setting on the right side and minimum whellbase base setting on the left. Starting point for the right rear spring poundage would be the drivers weight. Depending on the track corner tightness and banking, a 20 to 30 pound lighter spring than the drivers weight may be used to obtain the right rear control arm pivot (keeping it level). Left rear spring poundage will control how quick the left rear rolls the chassis, yes but on the right front corner that spring will control how fast the chassis settles back on the rear for drive off the corner. Too heavy of a right front will make the chassis drive toward the wall coming off the corner, so a real heavy spring there is not the answer. Left front spring is a no brainer cuz you only need the left front to drive through the pits unless you are letting off the throttle drastically on corner entry. On dirt, who lets off right ? (wink)... If you are lost on your front spring starting point.. throw a couple of 200's at each side up front to start neutral and see how the chassis reacts with the racers weight and driving style. Adjust spring poundage for corner entry if you run out of adjuster threads, basically, while nailing the perfect set-up down. Once again, if you take some one else's setup and put it in the car It prolly wont work. Driver weight difference, amount of lead and where it is mounted will come into play for chassis reaction on different segments of the track... Soft springs are a plus also because dirt tracks are rough and hitting those rough spots will upset the chassis severely with heavy springs. I hear tails of cars running 100 pound springs but know that my chassis never have over a 200 on any corner. Set-up info provided looks like you would be trying to take a dump truck around a dirt road corner at 60 mph.. you be out in the rhubarb going into the corner and need a tow rope to pull ya off the corners.... might work on a smooth glassy dryslick track but I would put it in file 13 for runnin on dirt..... Sorry if I kicked over the bean can here
~Gimpster~
