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We run a 4 bar, lift arm UMP modified. We have 50 degrees of bar angle on the top LR bar, and we are maxed out on our bottom LR bar to put steer in the car/drive. After the feature I check tires with the bare hand method, the RR has nice even heat across it, but the LR tire is barely warm. I'm wondering if any of you have had this problem of possibly picking the LR up causing no drive out of it? Will shortening bar lengths help? Or taking more out of the limiting chain help? Have a handful of races before Nationals and want to get something figured out. Any help is appreciated
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I have seen photos of modifieds with the lr off the ground but those were underslung cars. how the he11 can you get 50 degrees of bar angle in your car. I would say you have something way off to need that much angle. , what kind of j-bar or straight bar are you running and how long? -
I know people say that over 47 degrees you lose its effectiveness but we kept raising it to hopefully get more angle in it making it react quicker. I believe our bar is like 16" long, driver does not like j-bar. We have changed a lot from the start of the season, but we have had no help from our chassis builder, so I just am running out of ideas on where to go with this, only things I can come up with is shortening left side bars to react even quicker, and I'm not sure to put more slack in the chain or take it out?Comment
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racewise.netComment
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I hope 50 degrees is at full drop? Raising the lower bar is counter-productive to loading the spring.Originally posted by jonnywhoop52 View PostModern Day Spec Wedge RacingComment
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I appreciate the link LITE, but it doesn't really help since there's no tech help, and there's no sessions in the near future before the end of the season. So it is kind of irrelevant.Comment
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yes 50 is at full drop. I thought lower LR put more steer in it and makes it react quicker since you shorten the angleComment
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If your spring is mounted on the birdcage on the backside of the rear, the more angle in the lower, the less spring loading you get from birdcage index.Originally posted by jonnywhoop52 View PostModern Day Spec Wedge RacingComment
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so is there a general way to get the LR to drive because it just has next to no heat in it after 20 lap featuresComment
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You most likely do not have enough weight on the lr when racing around the track. Depending on how the car works, there are a million ways to do that. All have trade-offs.
You might need more leftside weight. More lr weight. Various spring changes and bar angle changes could get you there. Don't be afraid to look at all the suspension at the other 3 corners.Modern Day Spec Wedge RacingComment
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we have a spring behind so would changing that spring to a lighter one in the LR help? Another thing is, is the chassis builder's car can run the bottom and be fast, our car has to be up top to be fast it does not like to stick on the bottom, and I know running the bottom is like having a job it sucks, but when we're getting beat because the bottom is fast we just kind of have to settle for a top 10Comment
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We have had this issue.... Guarantee not the same chassis because I have an odd ball. Easiest thing is to give me a call and I can tell you what we are finding, just with all the rain recent, have only gotten to try a few things that have helped. To much to discuss here.
Lance
cell #: 812-470-0063Comment
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post your static bar angles/lengths and springs/%'s and we can help alot more. Its really a shot in the dark w/o knowing that. On the LR spring it depends if its a stop and go track(LR setting down) or a momentum track(LR still up).Originally posted by jonnywhoop52 View PostComment
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maybe index the lr b/c?Comment
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sounds to me like the car is already way to tight. if i was guessing, with those extreme bar angles, the lr is at max tracion as soon as he gets on the gas which is making him think he has no lr traction. the lr has to be able to work, he is probably breaking the car loose when he gets back in the throttle and rear tires are spinning on corner exitComment
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