The Outcast Posted November 30, 2007 Report Share Posted November 30, 2007 I've just had new tyres fitted on my Omega at my local ATS Euromaster. (Michelin because I'm a fan. ) I asked them to check the tracking and they told me they can't. I need to take it to the dealer or a specialist. It seems that the car needs to be weighted. 70 kilo in each front footwell. That's a new one on me. I've had Omegas for ten years now and that's a first. Anybody any comments? Quote Link to comment Share on other sites More sharing options...
Tony Posted November 30, 2007 Report Share Posted November 30, 2007 Actually that's true? The target data for the Omega assumes the suspension is preloaded... Most times this is not observed and the changes between the loaded and unloaded positions are easy to calculate. Quote Link to comment Share on other sites More sharing options...
The Outcast Posted December 1, 2007 Author Report Share Posted December 1, 2007 Actually that's true? The target data for the Omega assumes the suspension is preloaded... Most times this is not observed and the changes between the loaded and unloaded positions are easy to calculate. Thanks for the quick reply, Tony. I'm sure that it must be easy to calculate the unladen settings (if you know how, which I don't) but it does beg more questions. Why isn't that the figure given by the manufacturer? If weight is so critical wouldn't it make more sense to just load the drivers side? After all most cars, most of the time, are only carrying the driver. John. Quote Link to comment Share on other sites More sharing options...
The Outcast Posted December 1, 2007 Author Report Share Posted December 1, 2007 It just got worse. I've phoned the local Vauxhall dealers who say it only needs weighting if you're doing four wheel tracking. So there you go. I just wish I lived closer to Watford. Quote Link to comment Share on other sites More sharing options...
Tony Posted December 1, 2007 Report Share Posted December 1, 2007 It just got worse. I've phoned the local Vauxhall dealers who say it only needs weighting if you're doing four wheel tracking. So there you go. I just wish I lived closer to Watford. Some manufacturers feel the calibration is more accurate if the bushings are loaded and the suspension is imaged in a moment of it's compression. Unless the car is intended for track use then the drivers weight is considered irrelevant although i secretly account for this if the owner "heavy" The dealers are wrong .... It's true to say laser alignment is linear in the longitudinal plane but the loaded car will compress the camber in the vertical plane... As the camber changes the toe will also change. The toe change is measured for track cars by pulling the vehicle down then up to measure the "toe tendency". The objective is to assess the centre of the gains/loses then set the toe to it's mid point. Quote Link to comment Share on other sites More sharing options...
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