downimpact Posted October 25, 2009 Share Posted October 25, 2009 Simple question how do I reduce understeer? My thoughts so far are to reduce weight at the front e.g. battery relocation, remove aircon... Would putting a strut brace on help as well? Quote Link to comment Share on other sites More sharing options...
bignum Posted October 25, 2009 Share Posted October 25, 2009 There`s a couple of options, Get a geo setup with more negative camber on the front, If you have adjustable suspension or antiroll bar, stiffen the rear or soften the front, sidenote, when adjusting any suspension do it with small adjustments and have an open space to test on. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 25, 2009 Share Posted October 25, 2009 High speed understeer, or low speed understeer? Corner entry, settled into the corner, corner exit understeer, or a combination? Wet or dry? You need tu post exactly what spec the car is now, in terms of wheel and tyre size, dampers and springs, ride height, anything you have a spec on, really. Quote Link to comment Share on other sites More sharing options...
downimpact Posted October 25, 2009 Author Share Posted October 25, 2009 Low speed under steer tight corners, happens in both wet and dry (round bus stop at llandow). Happens upon turn in and fails to grip until either slowing down enough and re-turning in or putting more throttle on to induce over steer. I have the stock bilstein option, have found the same problem with both stock 16s and stock 17s and standard tyre sizes. Quote Link to comment Share on other sites More sharing options...
downimpact Posted October 25, 2009 Author Share Posted October 25, 2009 There`s a couple of options, Get a geo setup with more negative camber on the front, If you have adjustable suspension or antiroll bar, stiffen the rear or soften the front, sidenote, when adjusting any suspension do it with small adjustments and have an open space to test on. I have thought about running more negative camber as it tends to be the edges of the tyres that wear out quickest due to cornering. How much would be advisable? Quote Link to comment Share on other sites More sharing options...
Kirk Posted October 25, 2009 Share Posted October 25, 2009 heres a good way to remove understeer..... you know that pedal on the right? push it a little harder Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 25, 2009 Share Posted October 25, 2009 Llandow is incredibly tight for a big heavy road car round the chicane. Post a front end photo if you have one, of it going round there. It's probably needing a lot more negative camber on the front, or a lot more spring and / or ARB stiffness all round, the former of which may well compromise tyre wear on the road, and cause bad tramlining, the latter will shake you and car to bits, long term. Compromising corner entry speed in favour of getting on the power as early as possible is the way to drive around it to some extent. Quote Link to comment Share on other sites More sharing options...
downimpact Posted October 25, 2009 Author Share Posted October 25, 2009 pics I have to hand, lots of body roll evident, though hard to tell if theres understeer there. This is the corner I seem to get it on the most. Would reducing weight at the front help or would it need to be quite radical to make a difference? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 25, 2009 Share Posted October 25, 2009 Not stiff enough, not enough negative camber. It may well be getting onto the front bump stop with that much roll, which sends the outer front wheel rate soaring and kills grip. Quote Link to comment Share on other sites More sharing options...
Kirk Posted October 25, 2009 Share Posted October 25, 2009 its not all about losing weight to reduce understeer... its how the car's suspension and geometry is setup.. as mentioned above by chris there are alot of factors involved in reducing understeer suspension wise Quote Link to comment Share on other sites More sharing options...
dr_jekyll Posted October 25, 2009 Share Posted October 25, 2009 what pressure have you got in the tyres? Quote Link to comment Share on other sites More sharing options...
nevins Posted October 25, 2009 Share Posted October 25, 2009 bit off topice but cant help but notice the remains of Jamie's tyres on the bus stop lol Quote Link to comment Share on other sites More sharing options...
downimpact Posted October 25, 2009 Author Share Posted October 25, 2009 what pressure have you got in the tyres? 35 cold, probably around 38 when warm. Quote Link to comment Share on other sites More sharing options...
Kirk Posted October 25, 2009 Share Posted October 25, 2009 its nout to do with tyre pressures in this case... You can see how much the body is rolling Quote Link to comment Share on other sites More sharing options...
downimpact Posted October 25, 2009 Author Share Posted October 25, 2009 Not stiff enough, not enough negative camber. It may well be getting onto the front bump stop with that much roll, which sends the outer front wheel rate soaring and kills grip. So new suspension, bushes (probably still original), more negative camber. Would be the first/most cost effective things to address? Then strut brace or more show than go? Quote Link to comment Share on other sites More sharing options...
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