SvenDriver Posted April 18, 2003 Share Posted April 18, 2003 I've a std road 7 with Michelin Pilots. The rear tyres are nice and evenly worn (down to 4mm in ) but the fronts are quite uneven. The front right has an inside edge wear of 4.5 mm and an outside edge wear of 6.5mm. The front left has an inside edge wear of 5ishmm and an outside edge wear of 6.5. I am wondering if this is normal/bad/good ? With 16.5psi all around the car does suffer from understeer with the back being too grippy. I can increase tyre pressure in back once I am happy that the new front brake pads give more stopping than the back. Link to comment Share on other sites More sharing options...
StewartG Posted April 18, 2003 Share Posted April 18, 2003 Too much toe-in. Cureing this should help your understeer too Link to comment Share on other sites More sharing options...
SvenDriver Posted April 18, 2003 Author Share Posted April 18, 2003 How much toe-in and camber etc should there be? And how do you adjust it. I have two tyre garages virtually next door to me and so getting it done is not a problem once I know the correct numbers. Failing that Millwood is 25 miles away. Link to comment Share on other sites More sharing options...
StewartG Posted April 18, 2003 Share Posted April 18, 2003 I think it should be 1.5 degrees neg camber (assuming radial tyres) and the toe-in is to taste so to speak but I would get them to set it at parallel and try it. Keep an eye on your tyre wear and see how the steering feels. Too much toe-out wears the inside edges and makes the car tram-line and follow road contours alarmingly, it does give fast steering response and less understeer though. Too much toe-in gives slightly dead feel to steering but the car tracks nice and straight with little correction needed, it will however wear the outside edges. Try it and find your own personal compromise. Link to comment Share on other sites More sharing options...
Richard J Darnell Posted April 18, 2003 Share Posted April 18, 2003 I have recently had my tracking checked due to uneven tyre wear. I had too much toe-out (1 degree) on each side. As Stewart says this resulted in the inside edge of the tyre wearing faster than the outside. Ratrace have now set the car up with less toe-out (close to 0 degrees). The turn is not quite as good but overall it is better with a less fidgety front end (and hopefully more even tyre wear). Link to comment Share on other sites More sharing options...
Jason Plato Posted April 19, 2003 Share Posted April 19, 2003 Given that you have rock hard pilots on the car , its probably taken 5K miles to wear the inside 1mm off !!! . A tiny variance in toe could produce this difference . If I were you I would be chuffed to beans that the bloody things are actually wearing out so that you can get some decent tyres 😬 - the back end isnt too grippy , think more that the front end lacks grip !! Dave Link to comment Share on other sites More sharing options...
SvenDriver Posted April 19, 2003 Author Share Posted April 19, 2003 My local tyre place has fixed front and back for <£20. Result! Before: FL Toe-out 3.5mm - tyre wear -1.5mm inside edge FR Toe-out 4.5mm - tyre ware -2mm inside edge RL Toe-out 5mm RR Toe-in <.5mm Symptoms (on track of course); Back kicks left under very hard braking. Back will not power-oversteer. Severe understeer - worse on RH bends. Fast steering response (relatively) After: FL & FR Toe-out 1.5mm RL,RR: Straight I have swapped the worn fronts and put them on the back. I have put Mintex pads in the front with Dot5.1 and left the rears with std pads. Car is slower to steer (relatively) but tramlines less. Car will power oversteer nicely- feathering the throttle to keep a tight corner. Power understeer seems to be completely gone or negligble. Brakes in a straight line nicely. Car fronts (still bedding in), but are now locking before backs. Pedal feel better. Link to comment Share on other sites More sharing options...
SvenDriver Posted April 19, 2003 Author Share Posted April 19, 2003 I think 2 full-on trackdays accounts for front tyre wear. 😬 😬 😬 Link to comment Share on other sites More sharing options...
Jason Plato Posted April 19, 2003 Share Posted April 19, 2003 How on earth did the local tyre place realign the rear toe 🤔 Dave Link to comment Share on other sites More sharing options...
Rob Walker Posted April 19, 2003 Share Posted April 19, 2003 Dave I am surprised you don`t know . Simply jack up the rear remove the wheels position a suitable block of wood against the de dion ear and bash it with a sledge hammer. This effectively removes the factory set 20` toe in and improves reverse turnin. Link to comment Share on other sites More sharing options...
Jason Plato Posted April 19, 2003 Share Posted April 19, 2003 Of course ........ silly me and there I was thinking Sevendriver had been done a peach 😳 Edited by - Dave J on 19 Apr 2003 21:42:26 Link to comment Share on other sites More sharing options...
SvenDriver Posted April 20, 2003 Author Share Posted April 20, 2003 I've no idea what they did. I was standing nearby but not paying attention. The wheels on the back stayed on. The car was on a ramp but not jacked up. All I can say is the car was not kicking sideways after they were done. Link to comment Share on other sites More sharing options...
StewartG Posted April 20, 2003 Share Posted April 20, 2003 I wonder if your kicking sideways was just tramlining caused by excessive toe-out or by the back brakes locking first. Link to comment Share on other sites More sharing options...
SvenDriver Posted April 20, 2003 Author Share Posted April 20, 2003 No. When I'm on the (flat) track I wear a four point harness and use a foam seat. I can feel everything that the car is doing. Under hard braking the fronts were staying straight with no kick from the steering wheel but the back left was kicking out. It felt like superman had run up alongside the rear of the car and given it a shove to the left. A little bit like how snap-oversteer due to LSD (not the drug) feels. Edited by - SvenDriver on 20 Apr 2003 22:20:38 Link to comment Share on other sites More sharing options...
Alias Posted April 21, 2003 Share Posted April 21, 2003 I've got a similar problem - but it's only affecting my FR tyre (wearing down more on the inside). Looks like tracking could be the problem. SvenDriver - which garage did you use? One car - 1400 Supersport with 6 gears and clamshell wings. Link to comment Share on other sites More sharing options...
SvenDriver Posted April 22, 2003 Author Share Posted April 22, 2003 Bob Marshall Tyres in Staple Hill. They are opposite the ATS place. The place has been around for years. Sold it's old place to ATS... I just told them the settings and they set the 7 accordingly. Link to comment Share on other sites More sharing options...
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