NSS Tire Shake Problem

Dads426 · 07-31-2012, 07:25 PM

We are running Hoosier Bias 29.5x10.5-15 D06 and when the tires are new (basically 1/2 a season old; we run about 9-10 races a year) we don't have any issues. But as the tires age, we are experiencing tire shake 10-20 feet out up to the 60' clock (usually during the wheelstand). Pressure is 12-14 lbs (changing it didn't help). Tried different shock settings. We have rotated the tires. Car is a 64 Dodge Polara running NSS, 493 wedge making about 650-700 HP, Auto with 2.77 first gear, 4.10 Dana. Typical ETs are 9.95 to 10.10 at 135 mph. When it doesn't shake, 60' times are in the 1.35 range; when it shakes, it drops to 1.46. It is not wheel hop and is not noticeable when viewing outside the car, but the driver can feel it (shakes the tach& dash pretty bad). Car weighs 3500 w/driver. Hoosier says the sidewalls are not designed for a 3500 lb car and we can't go any wider. They suggested lowering the pressure so the tire cups at launch and spins (from less contact area) since the tire is biting hard and rolling over on itself. Anyone experience this problem and what did you do (besides buying new tires mid season)?

Thanks.

07-31-2012, 07:25 PM	#1
Dads426 Junior Member Join Date: Feb 2011 Posts: 10 Likes: 0 Liked 0 Times in 0 Posts	NSS Tire Shake Problem We are running Hoosier Bias 29.5x10.5-15 D06 and when the tires are new (basically 1/2 a season old; we run about 9-10 races a year) we don't have any issues. But as the tires age, we are experiencing tire shake 10-20 feet out up to the 60' clock (usually during the wheelstand). Pressure is 12-14 lbs (changing it didn't help). Tried different shock settings. We have rotated the tires. Car is a 64 Dodge Polara running NSS, 493 wedge making about 650-700 HP, Auto with 2.77 first gear, 4.10 Dana. Typical ETs are 9.95 to 10.10 at 135 mph. When it doesn't shake, 60' times are in the 1.35 range; when it shakes, it drops to 1.46. It is not wheel hop and is not noticeable when viewing outside the car, but the driver can feel it (shakes the tach& dash pretty bad). Car weighs 3500 w/driver. Hoosier says the sidewalls are not designed for a 3500 lb car and we can't go any wider. They suggested lowering the pressure so the tire cups at launch and spins (from less contact area) since the tire is biting hard and rolling over on itself. Anyone experience this problem and what did you do (besides buying new tires mid season)? Thanks.