Tony Posted July 1, 2009 Report Share Posted July 1, 2009 So, When does WIM North open then? . We have quite an announcement to make in the next few weeks and i'm working now to secure northern franchise Quote Link to comment Share on other sites More sharing options...
Mark H. Posted July 1, 2009 Report Share Posted July 1, 2009 So, When does WIM North open then? . We have quite an announcement to make in the next few weeks and i'm working now to secure northern franchise Seems like i've already made the announcement, oops. Make sure its near where i live . Quote Link to comment Share on other sites More sharing options...
CIH Posted July 2, 2009 Author Report Share Posted July 2, 2009 As a base you need a castor of around +4d, this will help the cambers migrate during transition. Another aspect of this would be the inner wheels extended castor sweep, this will reduce the rear cocking a paw. The power steering can cope with such a high castor by the way This reminded me of something. Sometimes I see camber that is more or less static during sweep. So is there a point where the castor-camber couple becomes more pronounced (ie such as 4d indicated above) ? Quote Link to comment Share on other sites More sharing options...
Tony Posted July 2, 2009 Report Share Posted July 2, 2009 As a base you need a castor of around +4d, this will help the cambers migrate during transition. Another aspect of this would be the inner wheels extended castor sweep, this will reduce the rear cocking a paw. The power steering can cope with such a high castor by the way This reminded me of something. Sometimes I see camber that is more or less static during sweep. So is there a point where the castor-camber couple becomes more pronounced (ie such as 4d indicated above) ? There little discernable difference until the lock is 10d or more, for accuracy i use 20d. Quote Link to comment Share on other sites More sharing options...
CIH Posted July 2, 2009 Author Report Share Posted July 2, 2009 but is there a point, if you were to reduce castor (bear with me here) where it would impact unpon camber migration ? Quote Link to comment Share on other sites More sharing options...
Tony Posted July 2, 2009 Report Share Posted July 2, 2009 but is there a point, if you were to reduce castor (bear with me here) where it would impact unpon camber migration ? It impacts immediately depending on the pivotal configuration, but i would say a 30' change in either direction from the design position is a concern. Quote Link to comment Share on other sites More sharing options...
CIH Posted July 3, 2009 Author Report Share Posted July 3, 2009 The configuration hadn't occured to me tbh. Quote Link to comment Share on other sites More sharing options...
Tony Posted July 3, 2009 Report Share Posted July 3, 2009 The configuration hadn't occured to me tbh. Example DB9 with an incorrect castor of 45' and toe 30'..... I could correct the toe and in doing so correct the castor all in one move. Obviously this is a very close configuration. Quote Link to comment Share on other sites More sharing options...
CIH Posted July 3, 2009 Author Report Share Posted July 3, 2009 What does a DB9 run ? Presume twin wishbone but where's the rack in relation ? front or rear ? Quote Link to comment Share on other sites More sharing options...
Tony Posted July 3, 2009 Report Share Posted July 3, 2009 Yep, twin wish and a fore steering rack.... Everythings very confined within the steer axis. Quote Link to comment Share on other sites More sharing options...
CIH Posted July 8, 2009 Author Report Share Posted July 8, 2009 have you noticed there seems to be a common perception of deeper castor being detremental to directional "agility" ? Quote Link to comment Share on other sites More sharing options...
Tony Posted July 8, 2009 Report Share Posted July 8, 2009 have you noticed there seems to be a common perception of deeper castor being detremental to directional "agility" ? Very much so if the long castor has a low camber.... Look at the drifty's we set, 7-8-9 degrees of castor (merc territory) but with 3 or 4d of camber. Quote Link to comment Share on other sites More sharing options...
CIH Posted July 8, 2009 Author Report Share Posted July 8, 2009 seems like deeper castor is the first stop when evolving a geo set-up ? But I've read (and was told) by two seperate places that deeper castor is detremental to lateral "agility" ? turn-in ? not sure on terminolgy here. Quote Link to comment Share on other sites More sharing options...
Tony Posted July 9, 2009 Report Share Posted July 9, 2009 seems like deeper castor is the first stop when evolving a geo set-up ? But I've read (and was told) by two seperate places that deeper castor is detremental to lateral "agility" ? turn-in ? not sure on terminolgy here. Fast road/ track/ drift and so on need the long castor to maintain high speed stability and aid camber migration, time-trials/ hill/ sprint would use a low castor since high speed stability isn't a requirement but the smaller corner radii is. Quote Link to comment Share on other sites More sharing options...
CIH Posted July 9, 2009 Author Report Share Posted July 9, 2009 would the hill/sprint peeps not appreicate the camber migration too ? Quote Link to comment Share on other sites More sharing options...
Tony Posted July 9, 2009 Report Share Posted July 9, 2009 would the hill/sprint peeps not appreicate the camber migration too ? They still have it but in a much smaller increment.... Think of the difference between the speed corner in and radii of a track car -V- a sprint corner in and radii Quote Link to comment Share on other sites More sharing options...
CIH Posted July 10, 2009 Author Report Share Posted July 10, 2009 I suppose Sprints are mostly tight hairpins 'n' what not ? Slightly off topic but this Astra today went really well; Quote Link to comment Share on other sites More sharing options...
Tony Posted July 10, 2009 Report Share Posted July 10, 2009 Nice work..... Good to see you did another castor swing after the camber adjustment Quote Link to comment Share on other sites More sharing options...
CIH Posted July 10, 2009 Author Report Share Posted July 10, 2009 I was mostly chuffed with the rear toe/thrust. N/S/F camber was like a 20 second job. Pre-WIM-trip I'd always try to crack-off the upper-hub/stur bolts with the wheel & target in-situ, which was a mare. I just noticed the cross SAI/IA disparity. Hadn't spotted that before Quote Link to comment Share on other sites More sharing options...
Tony Posted July 10, 2009 Report Share Posted July 10, 2009 I was mostly chuffed with the rear toe/thrust. N/S/F camber was like a 20 second job. Pre-WIM-trip I'd always try to crack-off the upper-hub/stur bolts with the wheel & target in-situ, which was a mare. I just noticed the cross SAI/IA disparity. Hadn't spotted that before SAI is good. Quote Link to comment Share on other sites More sharing options...
CIH Posted July 10, 2009 Author Report Share Posted July 10, 2009 Yeah but I'll have to look-up my notes and see what the (more or less) equal camber but IA disparity means. Quote Link to comment Share on other sites More sharing options...
Tony Posted July 10, 2009 Report Share Posted July 10, 2009 A change in the position of the SR, the positions your had here are way to small to be concerned. Quote Link to comment Share on other sites More sharing options...
CIH Posted July 10, 2009 Author Report Share Posted July 10, 2009 Doesn't it help determine where the actual bend is ? Useful if the primary position cannot be recovered jah ? TBH I was surprised to get the -30" I was looking for on the N/S. Quote Link to comment Share on other sites More sharing options...
Tony Posted July 10, 2009 Report Share Posted July 10, 2009 Doesn't it help determine where the actual bend is ? Useful if the primary position cannot be recovered jah ? TBH I was surprised to get the -30" I was looking for on the N/S. If the cambers are adjustable then using the SAI/IA for diagnostics is more or less redundant.... In these cases if the actual camber position is correct you have to ignore the SAI unless the disparity is more than 2d..... The 2d is my limit, not a globally recognized limit because there's no global SAI disparity and those that show a disparity display pointless limits. Quote Link to comment Share on other sites More sharing options...
CIH Posted July 10, 2009 Author Report Share Posted July 10, 2009 Speaking of which, curious there isn't always a Thrust target ? Can't imagine a domestic car having anything other than a zero thrust angle. Quote Link to comment Share on other sites More sharing options...
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