blondie11411 Posted June 15, 2013 Report Share Posted June 15, 2013 Hi all new here just need a bit of help I have fitted my 06 mx5 with bc racing coilovers and had alignment done Then had new tyres fitted and recently have been getting a loose feeling in the suspension It feels like the standard suspension all squishy(bit difficult to explain lol) if you turn too quick it wallows and just feels soft Just wondering if anyone has any ideas would be much appreciated Thanks Quote Link to comment Share on other sites More sharing options...
Tony Posted June 16, 2013 Report Share Posted June 16, 2013 Hi ya and welcome to wim The BC's are high end so there's no question of the product, so let's look at the settings?.... What damper numbers do you have front and rear? What trim height do you have front and rear? by trim i mean the distance between the middle of the wheel up-to the wheel arch at the 12oclk position ( the vertical line ) The alignment/ geometry's job is to fine-tune and compliment the modification. Geometry is end stage so a critical player and needs to be set correctly, do you have any numbers we can read? Quote Link to comment Share on other sites More sharing options...
blondie11411 Posted June 16, 2013 Author Report Share Posted June 16, 2013 Currently running dampers quite hard at 15 front and 20 rear and not too sure about the height will have to measure. The geo figures off the top of my head are camber 1 deg front and 1.25 rear and toe dead straight as far as I can remember and no castor measurement Thanks Quote Link to comment Share on other sites More sharing options...
joeB12 Posted June 17, 2013 Report Share Posted June 17, 2013 If the car is getting used solely for road use, those damper settings need to come way down, also the front is never really set to stiffer on the front than the rear. Try backing them off to 10 front and 8 rear. That's how I like to run the NC BCs. Also, the rear camber could do with being about half a degree deeper, and ideally around 0.19 total toe in on the rear, 0.10 total toe in on the front. As for the caster, getting that measured should be a priority.Joe Quote Link to comment Share on other sites More sharing options...
Tony Posted June 17, 2013 Report Share Posted June 17, 2013 Absolutely agree there! 1 Quote Link to comment Share on other sites More sharing options...
blondie11411 Posted June 17, 2013 Author Report Share Posted June 17, 2013 ok that sounds like good advice thanks. do you guys do corner weighting. think i might just take a trip up to you guys how much would you charge for geo and weighting if you do it thanks guys Quote Link to comment Share on other sites More sharing options...
blondie11411 Posted June 17, 2013 Author Report Share Posted June 17, 2013 also just ordered two tyres to match the others i have just incase that is the problem Quote Link to comment Share on other sites More sharing options...
blondie11411 Posted June 17, 2013 Author Report Share Posted June 17, 2013 ok guys just found the geo printout and here are the figures left front camber= -1.oo deg right front camber= -0.59 deg left front toe= +0.07 right front toe= +0.04 left rear camber= -1.25 right rear camber= -1.25 left rear toe= +0.11 right rear toe= +0.10 no castor measurement Quote Link to comment Share on other sites More sharing options...
Tony Posted June 18, 2013 Report Share Posted June 18, 2013 Numbers are not right but not a million miles away from where they should be.... CASTOR is the issue for now! Any change in height, rake ( body level front-to-rear ) or movement in camber position will dramatically change the castor position. One of Castors duties is directional stability, this is a mechanical force that generates steering weight and feedback in fast line and cornering reply, you cannot have a low value or imbalanced forces. At the moment the positions are totally blind, this is very unprofessional and inexcusable since the angle is adjustable and a critical player after the type of modification taken place. I'm more than willing to contact the place that did the work if you want to pm me the cars details/ invoice number and contact details and i will explain the error of their ways..... Your call? Quote Link to comment Share on other sites More sharing options...
blondie11411 Posted June 18, 2013 Author Report Share Posted June 18, 2013 Oh ok no it's fine I will go and have a word tomorrow. What should the castor be set at as I will make them do it for free or refund me. Thanks for your help Quote Link to comment Share on other sites More sharing options...
joeB12 Posted June 19, 2013 Report Share Posted June 19, 2013 You should be looking from anywhere between 5.30 and 6.30 for the caster. But all the settings really depend on what ride height you're running. If you're in the area at any point give either me or Tony a call or a PM and we'll get it booked in for a little fine tune. Joe Quote Link to comment Share on other sites More sharing options...
Tony Posted June 19, 2013 Report Share Posted June 19, 2013 Oh ok no it's fine I will go and have a word tomorrow. What should the castor be set at as I will make them do it for free or refund me. Thanks for your help Depending on the wheel size it should be set to 6 degrees 34' and in my book also even to the tolerance of 30' over the axle. Historically on the MX5 due to lowering the chassis knocks back the castor in position and depending on the camber "adjustment" this will leave you with an imbalanced force ( as explained ) My concern is... And let's be honest there is a severe level of ignorance from those who set the chassis not to measure the castor position! Assuming you have 17" wheels here is the correct target data Rear Camber: -1 degree 41' Toe: + 18' total or +9 each side Front Camber -51' Castor as said + 6 degrees 34' and even! Toe: +8' total or +4' per side Ideal trim height is 345mm measured centre of the wheel in the vertical plan> 12oclk wheel arch front and rear, damper settings are as Joe said but you need to explore personal settings. As offered if you find this information difficult to transport or feel fobbed off, let me know and i will deal with it for you. Quote Link to comment Share on other sites More sharing options...
blondie11411 Posted June 19, 2013 Author Report Share Posted June 19, 2013 Ok guys I really appreciate the help they are doing it Saturday free and fitting my tyres free so fingers crossed, if it still feels crap I will bring it to you guys. But just measured my trim height and is spot on so that's one thing that's good Thanks again Quote Link to comment Share on other sites More sharing options...
Tony Posted June 20, 2013 Report Share Posted June 20, 2013 Give them the numbers to hit and if there's any issues worrying you or they don't understand the increment of measurement, degrees and minutes/ decimal degrees and minutes give me a call on> 07948427383 and i will help or translate the numbers to whatever increment they use Quote Link to comment Share on other sites More sharing options...
blondie11411 Posted June 20, 2013 Author Report Share Posted June 20, 2013 brilliant will let you know Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.