nick_johnson Posted May 13, 2018 Report Share Posted May 13, 2018 Hi Guys, I’ve just fitted my new Eibach Anti-Roll Bars and noticed that there are two settings, one that is slightly softer and also a harder setting? I was interested to know if any of you are running Eibach Roll Bars and what setting you prefer, I realise that it is opinion but I’m just curious what people have chosen? I’ve opted for the softer setting to start with. Nick Link to comment Share on other sites More sharing options...
jcbaldock Posted May 14, 2018 Report Share Posted May 14, 2018 Hi Nick - My Boxster is a track car (still road legal and wife-friendly, but quite a few modifications) and I run the Eibach ARB's set to the harder setting on the rear and the soft setting up front to help reduce understeer. Of all the changes I've made to the car for the track, these are one of the best ones IMO. Cheers, Jon Link to comment Share on other sites More sharing options...
nick_johnson Posted May 14, 2018 Author Report Share Posted May 14, 2018 Brilliant, thanks Jon. This is exactly what I wanted to hear, as I wanted to do the same to minimise understeer. Link to comment Share on other sites More sharing options...
edc Posted May 14, 2018 Report Share Posted May 14, 2018 Theres a few other things you can try to minimise understeer. More front negative camber or less rear negative camber, wider front track eg using spacers, wider front tyre (and/or narrower rear tyre), more rake. Link to comment Share on other sites More sharing options...
911-32 Posted May 14, 2018 Report Share Posted May 14, 2018 3 hours ago, edc said: Theres a few other things you can try to minimise understeer. More front negative camber or less rear negative camber, wider front track eg using spacers, wider front tyre (and/or narrower rear tyre), more rake. ...softer front tyre pressure, harder rear tyre pressure... Link to comment Share on other sites More sharing options...
Anker BS Posted May 14, 2018 Report Share Posted May 14, 2018 Optimal tire pressure in front reduces under steer. The only way to figure optimal pressure is to use chalking and/or tire temperature after pushing the tires to the limit. The easiest way to do this is on the skid pad, the track or an autocross course. The recommended tire pressures for the Boxster are intentionally set to induce under steer, for safety reasons, so typically you will have to increase front pressure somewhat to minimize under steer. Different tires will have different optimal pressures because of differences in composition and side wall stiffness. Link to comment Share on other sites More sharing options...
nick_johnson Posted May 14, 2018 Author Report Share Posted May 14, 2018 Mines on Pilot Sport 4’s any ideas what pressures I should be running front and rear, looking for something more neutral / playful rear end rather than oversteer. Link to comment Share on other sites More sharing options...
Anker BS Posted May 14, 2018 Report Share Posted May 14, 2018 Haven't tried those. Try raising front pressure by 2-3 PSI and lowering rears by the same. Do some spirited driving before and after and see how it worked out. Even better, try chalking your tires before doing it and see if hard cornering on hot tires removes the chalk to the transition between tread and sidewall. I omitted to mention in my previous post that camber settings and roll bar settings also affect under steering. A lot of parameters! There's more to this than I can cover in a couple of simple posts. Link to comment Share on other sites More sharing options...
Anker BS Posted May 14, 2018 Report Share Posted May 14, 2018 One more point: If you want optimal performance you need to determine your optimal hot tire pressures. When I am on the track or doing autocross I set the optimal hot tire pressure and have to let out air to reach it. When I get home I change the pressures to the optimal for street driving, which is warm tires. After track days I have to add air to get there, Link to comment Share on other sites More sharing options...
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