Terrible handling on Rainsports
Discussion
Just fitted 2 Rainsport 5s to the back instead of Toyos, as a lot of PH’ers recommend them. (225/50R16 replacing 245/45R16). The car was a pleasure to drive on Toyos with precise handling so that I could put the car on a selected point to within what felt like mm. I have now done 100 of the most unpleasant miles ever. Right from go it was bad and I hoped that might fade after a few bed-in miles, but no. Steering is very ‘darty’ and once a turn is started it requires counter-steering to maintain turn rate and the same double input coming out of the turn. Self-centering is minimal. At 40mph its just about ok, at 50 its taking a lot of concentration and 60 is as fast as I dare go now. It feels as if its trying to kill me and overtaking is almost impossible as I can’t keep it in a straight line accurately enough. Both tramlining and bump-steer have appeared, neither existed before.
So, do I take a hit and go back to Toyos or do I perservere with the RS5s by getting a full suspension geo done?
So, do I take a hit and go back to Toyos or do I perservere with the RS5s by getting a full suspension geo done?
Looked up Linear Range Oversteer and sounds a spot on description. As an ex aerospace test engineer I am familiar with aircraft ‘static’ and ‘dynamic’ flying qualities and this is similar. If it was an aeroplane it would be grounded until this major deficiency was corrected. Off to buy some Toyos this morning.
Should get to try Toyos tomorrow. My slight concern is that the TR1 is of course different from the T1Rs that the car was set up for. Hopefully not that different.
For info, I have 16” all round as the front has a Wilwood big brake kit and sits on Nitrons all round. Just to clarify, with the Toyo T1R, 225 on the front and 245 at the rear at F22psi and R24psi, the handling was perfect, a pleasure to drive, and has been like that ever since a geo setup by Neil Garner at Kemble. The only thing that turned it into a hedge finder was fitting RS5s to the rear.
Update tomorrow and interesting to read all your comments!
For info, I have 16” all round as the front has a Wilwood big brake kit and sits on Nitrons all round. Just to clarify, with the Toyo T1R, 225 on the front and 245 at the rear at F22psi and R24psi, the handling was perfect, a pleasure to drive, and has been like that ever since a geo setup by Neil Garner at Kemble. The only thing that turned it into a hedge finder was fitting RS5s to the rear.
Update tomorrow and interesting to read all your comments!
Well, Toyos are delayed and will be another week now, so getting the old worn ones put back on. Fortunately not yet collected for disposal!
Plan now is to keep these on while getting some independent advice on which way to go from TVR specialists. I would be quite happy to change all 4 and get a geo setup if thats what it takes to get my nice handling back.
Spitfire; yes, exactly that feel and I dont like it!
Kawasicki; thanks for pointing me at Bundorf, an interesting read and lots of aircraft parallels. If I may, could I point you at Longitudinal Static Stability for fixed wing aircraft.
Thanks all, and I will update when something happens. Good or bad.
Plan now is to keep these on while getting some independent advice on which way to go from TVR specialists. I would be quite happy to change all 4 and get a geo setup if thats what it takes to get my nice handling back.
Spitfire; yes, exactly that feel and I dont like it!
Kawasicki; thanks for pointing me at Bundorf, an interesting read and lots of aircraft parallels. If I may, could I point you at Longitudinal Static Stability for fixed wing aircraft.
Thanks all, and I will update when something happens. Good or bad.
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