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Post by wrencheadracing on Mar 4, 2015 22:38:30 GMT -6
hello guys. new to the forums and new to the class we call hobby stock. last year I raced what would be considered pure stock. no options to change handling other than springs and shocks. tire psi was preset, all the same wheel offsets/widths, same tire sizes.
now with the hobby stock we can run different wheel offsets. I have 3" and 2" wheels, I always start with the 3". different tire sizes. I have 235/70/15 and 225/70/15, I run 235 right side 225 left side. we are allowed spacers. I have a few 1" spacers. and of course shocks and springs. not rebuild-able. car is a 79 Camaro. psi I run is 16 left side 24 right side. our track is tight high banked 1/3 mile. starts tacky ends dry slick
so here are my questions regarding loosening or tightening the car on entry, center, and off
what does increasing/decreasing tire pressure in each tire do?
what about spacers offset as for using a spacer/offset on each corner? for instance, if I move the LF tire out, what does that do?
I am set on the shocks and spring rates as I know we are running same as everyone else at the track. I just want to educate myself on the ways to follow the track conditions with the correct setup adjustment as the night progresses.
thank you
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Post by leaf4life on Mar 5, 2015 22:16:43 GMT -6
Here are some of the basics. The closer you bring a wheel in toward the center of the car, the more load that tire has. I would say run a 2 off on the RF AND 3 off everywhere else. It sounds as if you have the right idea on tire size but if I could make a suggestion. I would run the larger tires on every corner EXCEPT the LF on a dry slick track. That would tend to tighten it up. When wet and tacky I would introduce stagger by putting your small tire on the LR ONLY to take some cross out to loosen up since the track is offering some grip. Keeping the car straight and smooth driving style works well with both setup. Tire pressure. If you can take your end of run pressure after your main and see how much they grow during the race you will have a good idea on how much pressure you need to start the main. The thought that many have is that the less pressure, the more traction. Not always true. If your under inflated, only the outside edges of the tire are making contact. Just the opposite on over inflation. just the middle of tire makes contact.you want as much contact as possible to the track with your tires to maximize grip.And on that note, since a 70 series tire is a rather tall sidewall, you can't run really low pressure without possibly popping a bead or rolling the tire over so hard your not using but the very outside edge of the tire on the right side. The left you can run pretty low and get away with it. So after a few races on the pressure you run note how much your tires are wearing. Outside edges worn-under inflation, middle worn- too much pressure. It will take a bit of time to find the correct pressure. And like I said previously if you know how much each tire grows by the end of the main, you can plan your pressure to be best at the end of the race when it counts. Hope this helps
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Post by flipflopoo1oo on Mar 6, 2015 6:00:19 GMT -6
I would advise to run a few searches on each as is addressed! I'm afraid to say much as I do tend to ramble into those 25-30 things changed by any adjustment! As long as they are all to the positive by the good intended, go with it but not as a crutch that mask other things or creates them! How would you know-- well the order of principles and well proven theories! mostly common sense! Math and geometry applies to most all but no degree needed! Leverage and common sense will do-- that and 35+ years of not trying but doing and winning! Its really hard to give any correct info for me as to the broadness of factors but most all is posted after all! Each is very different as to each need per setup! Some are givens as to letting the car adjust to the track by having things to keep with in a working range!--- example-- our set up would crash in the first turn while others would be close and vise versa with the same shocks only!!! I have always followed no one but pass or even lap by theories of operation! Wish I had better answers for you but lack of info limits my opinions as to what will or will not work! A few night reading my post will do one of two things-- help or confuse and bewilder! Start with a open mind and not the rear axle!-- that's 3 isn't it-- escalation is the enemy on choices as well! Think of what you want to happen and use variations as to make it happen!!!
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