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Title: Hi Tech Laser Bump Sreer Gauge Post by: sgo on September 18, 2005, 04:52:16 AM For about $12 at your local electronics store you can get a "Laser Pointer" and with a rubber band, some tape and a sheet of chip-board you can have your very own bump-steer gauge.
Perfect for checking that rack installation! (http://img.photobucket.com/albums/v164/sgomachen/CAR PICS/BumpGauge.jpg) If all is well the dots you mark, through the suspension travel, should all be in a straight line. Title: Re: Hi Tech Laser Bump Sreer Gauge Post by: Ed on September 19, 2005, 10:28:24 PM Hey SGO,
that's a neat idea. the set up you have there looks interesting too Cheers Ed Title: Re: Hi Tech Laser Bump Sreer Gauge Post by: Dr_Terry on September 20, 2005, 11:15:41 AM Hi sgo.
The set-up you have there is quite good, but you mention that all the dots should be in a straight line. The line should also be dead vertical. If the line was straight but at say a 20 degree angle you would still have bad bump steer. It's actually probably MORE important that it be near vertical than actualll dead straight. Dr Terry. Title: Re: Hi Tech Laser Bump Sreer Gauge Post by: sgo on September 21, 2005, 07:45:52 PM Thanks Dr Terry,
So if the line is at an angle, with the ride height point in the centre, then you would have toe-in above the centre point and toe-out below the centre point, for example? ? ? Title: Re: Hi Tech Laser Bump Sreer Gauge Post by: Dr_Terry on September 22, 2005, 06:01:08 AM Hi sgo.
Yes, exactly, you do not want the line to be anything other than vertical, otherwise you will have toe variation on suspension travel, which of course is what bump-steer is. Dr Terry. |