NicBowman Posted April 15, 2007 Report Share Posted April 15, 2007 Hi My 92 TVR Griffith has been discussed in this forum previously, symptom is steering gets pulled by road defects, eg potholes, etc. I have just measured the scrub radius, not a desperately easy task, and find it about 20mm positive. I recon the car drives as though it has too much positive scrub, the question is, is 20mm a lot? Too much? Ta Nic Quote Link to comment Share on other sites More sharing options...
Tony Posted April 15, 2007 Report Share Posted April 15, 2007 Hi My 92 TVR Griffith has been discussed in this forum previously, symptom is steering gets pulled by road defects, eg potholes, etc. I have just measured the scrub radius, not a desperately easy task, and find it about 20mm positive. I recon the car drives as though it has too much positive scrub, the question is, is 20mm a lot? Too much? Ta Nic I would say yes. 0 to negative is more doable. You need to shorten the lower arms position and incline the sai/kpi, or change the wheels off-set. Quote Link to comment Share on other sites More sharing options...
NicBowman Posted April 16, 2007 Author Report Share Posted April 16, 2007 Hi My 92 TVR Griffith has been discussed in this forum previously, symptom is steering gets pulled by road defects, eg potholes, etc. I have just measured the scrub radius, not a desperately easy task, and find it about 20mm positive. I recon the car drives as though it has too much positive scrub, the question is, is 20mm a lot? Too much? Ta Nic I would say yes. 0 to negative is more doable. You need to shorten the lower arms position and incline the sai/kpi, or change the wheels off-set. Does anyone have a foolproof way of measuring scrub radius? Just to ensue I am correct. To change on a TVR is tricky, if I change the wheel offset the wheels will look odd, 20mm inset. An increase in wheel diameter will give a small bonus, but as KPI is around 11 degrees, it is only 1mm scrubb change for every 5mm radius of wheel. So would need 23" rims to fully correct! Otherwise it is a remanufactured upright. Nic Quote Link to comment Share on other sites More sharing options...
Tony Posted April 16, 2007 Report Share Posted April 16, 2007 Hi My 92 TVR Griffith has been discussed in this forum previously, symptom is steering gets pulled by road defects, eg potholes, etc. I have just measured the scrub radius, not a desperately easy task, and find it about 20mm positive. I recon the car drives as though it has too much positive scrub, the question is, is 20mm a lot? Too much? Ta Nic I would say yes. 0 to negative is more doable. You need to shorten the lower arms position and incline the sai/kpi, or change the wheels off-set. Does anyone have a foolproof way of measuring scrub radius? Just to ensue I am correct. To change on a TVR is tricky, if I change the wheel offset the wheels will look odd, 20mm inset. An increase in wheel diameter will give a small bonus, but as KPI is around 11 degrees, it is only 1mm scrubb change for every 5mm radius of wheel. So would need 23" rims to fully correct! Otherwise it is a remanufactured upright. Nic 11d KPI is very declined..... What other data do you have for the front.. Also how adjustable is the car? Quote Link to comment Share on other sites More sharing options...
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