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914World.com _ 914World Garage _ tire air pressure question & VIDEO

Posted by: jimkelly Sep 6 2015, 08:09 AM

I think I currently have 32 psi in all 4 tires. they are new and just installed. when I went for my first real drive to dmv, I can feel big slop in the rear handling/tracking. I may have some suspension tweaking to do, and car has not had an alignment, but I think 32 psi is far from being enough.

what do you guys think???? this is me pushing car side to side, showing tire sidewall movement.

https://www.youtube.com/watch?v=aptbCK1rj6o

Posted by: 914Mels Sep 7 2015, 11:00 AM

What is the recommended tire pressure spec molded into the tire say? Radial tires have fairly flexible side walls so a flex like that is probably normal. I wouldn't go above the max inflation pressure for the tire.

Posted by: jimkelly Sep 7 2015, 11:16 AM

looks like 51 psi is max. so I could try 40 psi and see if that helps. Dunlop sp sport 5000.

Attached image(s)

Posted by: Mike Bellis Sep 7 2015, 12:19 PM

Lots of variables like tire type and width. I run 35psi of nitrogen in 225/50/16 & 245/50/16. Nitrogen is more heat stable and is a large molecule so tends to leak less then standard air.