jt1 Posted March 5, 2003 Share Posted March 5, 2003 I was getting my car ready for an OT event at Roebling this past weekend, and decided to check the corner weights. I had previously adjusted the coilovers by *ahem* visual ride height estimation, and suspected the weights were not optimum. I borrowed a set of wheel scales from one of my circle track buddies and checked it out. Sure enough, the weights were: LF 595 RF 730 LR 658 RR 547 Total 2529 After a bunch of adjusting, I got: LF 656 RF 667 LR 598 RR 610 With my big butt in the seat, this yields: LF 716 RF 664 LR 717 RR 642 Total 2739 And the following percentages: F 50.38 R 49.62 LS 52.31 RS 47.69 LF-RR 49.58 RF-LR 50.42 All my chassis setup experience is with circle track stuff, I've just got into the OT thing in the last year or so. So, this brings up the question of what is best for an OT car? My goal was to get everything as even as possible, but is that optimum? I'm not far enough along to worry about getting the best setup for certain tracks, just want something for general usage at OT events. The rest of the setup is 250 # springs on all four corners, tokico 5-ways in the middle position, 24mm front bar, no rear bar, tires are 225/50-15 Yoko AVSI's, run at 38 psi. The above weights were with 3/8- 1/2 tank of gas, which is what I usually start a run with, burning 4- 4 1/2 gals in a 30 min run. The car has a light push on entry and in the center of the turns, rotating easily with the throttle on exit. What do I need to do to improve? Thoughts, comments & observations? John Quote Link to comment Share on other sites More sharing options...
Mudge Posted March 5, 2003 Share Posted March 5, 2003 When you corner weight a car you generally want to shoot for LF+RR=RF+LR, this way your braking is predictable. You also might generally shoot for 50/50 front to rear, and left to right, however some people may prefer a slight balance otherwise. Probably most commonly going for more rear weight in certain cars, or whatever. Also using some lead shot or cement bags to simulate driver weight is helpfull, people do this for alignments as well. I prefer a pretty neutral car right now because its easier to drive a neutral car, until you get some nice experience points behind your belt. Then people start playing with braking bias as well, for me right now I just want to tone the rear brakes down! The rest of the setup is 250 # springs on all four corners You'll find plenty of argument with that setup. I dont know of any car, anywhere, that prefers to have a set of the same springs on all four corners. I have heard of however, 450# on a Z car, all four corners, interesting and extremely stiff. This was discussed on this site before (when I first came here), as being bad because all corners oscillate at the same frequency and the car will not want to stop oscillation, this may also cause the car to want to exit the pavement in a vertical fashion, and cause massive loss of stick because of this. If your going to run 250s on front how about 300-325 in rear? Quote Link to comment Share on other sites More sharing options...
CruxGNZ Posted March 6, 2003 Share Posted March 6, 2003 jt1, Look at this post about equal spring rates: http://www.hybridz.org/phpBB2/viewtopic.php?t=7663&highlight= !M! Quote Link to comment Share on other sites More sharing options...
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