Jap Devil Posted May 7, 2006 Report Share Posted May 7, 2006 (edited) I'm running the IS300 on HKS HiperMax RS coilovers which have been fitted approx 1,500 miles ago and have been fine up until recently with no knocking or tapping. What I've noticed is a sharp "cracking" noise which appear to originate from the N/S rear and is most apparent when turning a sharp left or right corner at low speed, but it also occurs going over speedbumps and rough surfaces. It's more apparent starting from cold but still happens after running for a while. I was think of the following possibilities: 1) A loose top mount? I'll need to remove the boot liner to check these. 2) A loose ARB drop link. Before Track Attack I removed all the wheels and did a visual inspection of the suspension and couldn't find anything loose. 3) No contact is apparent between the coilover spring and the inner tyre wall. Any ideas / suggestions are most welcome Edited May 7, 2006 by Jap Devil Quote Link to comment Share on other sites More sharing options...
Tony Posted May 7, 2006 Report Share Posted May 7, 2006 What I've noticed is a sharp "cracking" noise which appear to originate from the N/S rear and is most apparent when turning a sharp left or right corner at low speed My guess would be the top mount. Reason is the activation left and right involves diagonal shear from the cars parallelogram... more prominent probably on a right lock. If the mount is loose it may knock by transmitting compression to the upper body housing. Quote Link to comment Share on other sites More sharing options...
MacRS200 Posted May 8, 2006 Report Share Posted May 8, 2006 What I've noticed is a sharp "cracking" noise which appear to originate from the N/S rear and is most apparent when turning a sharp left or right corner at low speed My guess would be the top mount. Reason is the activation left and right involves diagonal shear from the cars parallelogram... more prominent probably on a right lock. If the mount is loose it may knock by transmitting compression to the upper body housing. I would say good guess Tony. I get that as well. Some "3 in 1" around the top mount from the inside does the trick Quote Link to comment Share on other sites More sharing options...
Tony Posted May 8, 2006 Report Share Posted May 8, 2006 What I've noticed is a sharp "cracking" noise which appear to originate from the N/S rear and is most apparent when turning a sharp left or right corner at low speed My guess would be the top mount. Reason is the activation left and right involves diagonal shear from the cars parallelogram... more prominent probably on a right lock. If the mount is loose it may knock by transmitting compression to the upper body housing. I would say good guess Tony. I get that as well. Some "3 in 1" around the top mount from the inside does the trick Hay i was trained by the Master ....... before you i was the master of coilover disaster. Quote Link to comment Share on other sites More sharing options...
Bazza Posted May 8, 2006 Report Share Posted May 8, 2006 are you sure you are not just sitting on a crunchie Quote Link to comment Share on other sites More sharing options...
Tony Posted May 9, 2006 Report Share Posted May 9, 2006 are you sure you are not just sitting on a crunchie Crunchie what? Quote Link to comment Share on other sites More sharing options...
Bazza Posted May 9, 2006 Report Share Posted May 9, 2006 are you sure you are not just sitting on a crunchie Crunchie what? bar Quote Link to comment Share on other sites More sharing options...
Tony Posted May 9, 2006 Report Share Posted May 9, 2006 are you sure you are not just sitting on a crunchie Crunchie what? bar Ever distracted...... wine or bistro Quote Link to comment Share on other sites More sharing options...
MacRS200 Posted May 10, 2006 Report Share Posted May 10, 2006 Bit off topic but once worked with a mechanic who told me that he had a lorry come in once that the driver complained made a "terrible screeching noise" going round corners. He had the brakes and sispension in bits and could find nothing wrong, so off the driver went and came straight back saying the noise was still there. Turned out to be an Irn Bru bottle wedged under the drivers seat, the noise was metal scrapeing on glass as the seat moved slightly. Quote Link to comment Share on other sites More sharing options...
Tony Posted May 10, 2006 Report Share Posted May 10, 2006 Bit off topic but once worked with a mechanic who told me that he had a lorry come in once that the driver complained made a "terrible screeching noise" going round corners. He had the brakes and sispension in bits and could find nothing wrong, so off the driver went and came straight back saying the noise was still there. Turned out to be an Irn Bru bottle wedged under the drivers seat, the noise was metal scrapeing on glass as the seat moved slightly. Did the mechanic beat the driver up when he found out?....... all that work for a bottle! Quote Link to comment Share on other sites More sharing options...
MacRS200 Posted May 10, 2006 Report Share Posted May 10, 2006 Bit off topic but once worked with a mechanic who told me that he had a lorry come in once that the driver complained made a "terrible screeching noise" going round corners. He had the brakes and sispension in bits and could find nothing wrong, so off the driver went and came straight back saying the noise was still there. Turned out to be an Irn Bru bottle wedged under the drivers seat, the noise was metal scrapeing on glass as the seat moved slightly. Did the mechanic beat the driver up when he found out?....... all that work for a bottle! Had it been a Coke bottle he probably would, by as Irn Bru is a well known cure for "a bad head" he let him off Quote Link to comment Share on other sites More sharing options...
Tony Posted May 11, 2006 Report Share Posted May 11, 2006 Bit off topic but once worked with a mechanic who told me that he had a lorry come in once that the driver complained made a "terrible screeching noise" going round corners. He had the brakes and sispension in bits and could find nothing wrong, so off the driver went and came straight back saying the noise was still there. Turned out to be an Irn Bru bottle wedged under the drivers seat, the noise was metal scrapeing on glass as the seat moved slightly. Did the mechanic beat the driver up when he found out?....... all that work for a bottle! Had it been a Coke bottle he probably would, by as Irn Bru is a well known cure for "a bad head" he let him off Bless...... then beat him up seems wiser Quote Link to comment Share on other sites More sharing options...
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