New to mods. I currently run a 4/z swing, floated, with coilover behind axle on lr. After the track gets slick, how do I get more traction from the left rear? Do I soften the spring or stiffen it to "push" or "hold" weight in that corner?
The lr isn't on a slider if thats what you're asking. As far as I know, its a typical KRC coilover. In the few times that I have ran, the car has been real tight getting in, so I was going to stiffen the lr spring to help loosen up getting in. The track I normally run dries out and gets slick. Wasn't sure if the stiffer spring would help or hurt on slick track?
put more LR bite in the car dont put a stiffer spring in the rear. more lr will also help the lr get up on the bars and help the car to roll over and get sidebite. you can put a stiffer spring in your rf also or just put more rounds in the rf to help loosen entry. you can put more rear brake in the car or go to 3 wheel brake if your not on it
Last Edit: Mar 28, 2008 22:02:53 GMT -5 by stompit
What I was asking is if you are running coilovers (like the LM aluminum, threaded body shocks), or coilover eliminators?
Not to disagree with stompit but we have had a lot more success in the slick running the 'big right rear spring' setups than any other setup we have ran. Granted this was in a 4 bar late model but I would suspect that the same principals would apply in a mod.
Also, depending on how you drive the car running a softer LR spring may actually help the car stay on and get on the bars. This is because with a softer spring you have a lot more pre-load in the spring this pushes down on the wheel for a longer time than a stiffer spring before you are 'on the bars'.
How much rake are you running in your J bar?
There is absolutely nothing wrong with using a set of grain scales and a calculator. You'd be shocked at some of the guys that use them over the fancy computer scales. Just something to think about.
Last Edit: Mar 29, 2008 20:55:54 GMT -5 by talclipse
I don't have the lm type coilovers, just eliminators. My chassis builder suggests starting the j bar 9 inches up on the frame and in the second hole up on the pinion mount. What about using a taller spring on the lr? Everything I currently have is 13", but I have been told going to a softer and taller(15") spring on the lr would keep it hooked up and give more drive off of the lr, especially in the slick?
The only advantage to going with a taller spring is it will compress more before reaching coil bind.
As long as you are not coil binding the LR spring you have nothing to worry about. If you are concerned that you may be coil binding put a plastic wire tie on one of the coils before hot laps and if it is gone or shows signs of being compressed after hot laps you are coil binding.
Try dropping the J bar down on the pinion to the bottom hole for some side bite.
Does the car get tighter on entry further into the feature? How is it on exit later in the event?
My car has always been tight getting in the corner. It may be something I am doing as a new driver, but it is tight getting in, then I break the car loose and mess up the middle and getting off. I have 800#lf, 750#rf, 225#lr 4 bar floated coilover behind and 275#rr z with swing arm on bottom with coilover mounted to the swingarm. I also have a biscuit bar.
Post by WV Race Fan on Apr 7, 2008 17:31:51 GMT -5
How much Left Side and Rear % do you have in the car? and is the car tight on or off the throttle on entry? Fixing the entry problem first may fix the other problems (breaking the car loose through the center and such as you described).
Generally though with a bigger RR spring it may help tighten the car on entry but it hurts drive off the corner (tightens off the throttle, loosens on the throttle). Some drivers prefer it, but others don't and I believe that has to do with driving style. You may just need to soften the RR spring to a 250, but I would also like to know your %'s.
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