Radial Slick Top End wig-wag Condition

CCRT · 05-12-2007, 08:54 PM

Looking for some help.

We run the M/T 3066R 30 x 9 radial slick on our Camaro.

Car is 3400lbs Tires set to 17.5 psi.

Right around 145 mph the body will wig wag from side to side. Can't feel anything in the steering or chassis. It's all body roll.

Back to back testing today switching to a M/T 28 X 10.5 bias ply corrected the condition.

I really hate to have to go back to the bias tire.

Does any body run these tires at 145-150 mph?

Any help or ideas would be greatly appreciated.

Thanks,

--Dave

1967 Camaro, Street Legal, Naturally Aspirated 406 SBC, 3400#, 9" tires 10.03 @ 132.48 1.40 60' Through the exhaust & Foot-Brakin'
9.07@147 with a little juice :-)
http://home.comcast.net/~ccrt-racing/ccrt.htm
CCRT
--Dave

Kenny Wigington · 05-12-2007, 11:42 PM

You have too much vehicle weight for that pressure. Go up , in small increments, until it spins. You'll know when it begins to. You may wind up in the 19 lb range, maybe a little more. A lot of stockers run upwards of 20 lbs, regularly.

Good Luck !

I hope they will replace that win light , on my side ! It looks like yours still works ?!

STK 2894

tpoh815 · 05-13-2007, 11:19 AM

it does not hurt to make sure you dont have a broken shock!!

Barry Polley · 05-13-2007, 01:24 PM

How many runs on the radials? We changed radials and corrected the problem. In second and third it was hooking and spinning left to right. A two handed deal for sure!

Barry

CCRT · 05-13-2007, 08:55 PM

These have about 40 passes....................

But have done it since day one :-(

1967 Camaro, Street Legal, Naturally Aspirated 406 SBC, 3400#, 9" tires 10.03 @ 132.48 1.40 60' Through the exhaust & Foot-Brakin'
9.07@147 with a little juice :-)
http://home.comcast.net/~ccrt-racing/ccrt.htm
CCRT
--Dave

Sean Ward · 05-13-2007, 10:25 PM

yeah you need to go up in pressure my car weights 4080# don't run that fast by no means but had same problem with radials at first really bad when i would lift at finsh always felt like assend wanted to pass front end started with 19# but went up in air and took care of the wig wag i run 25#s of air and its like a caddy nice and smooth

sean ward
stk# 2882

Barry Polley · 05-13-2007, 11:04 PM

Dave,
At 3610 we run 20 -21 on a good track.

rallye bob · 05-14-2007, 08:00 PM

Ever try the Hoosier 30 x 9 radial slick? I run them on my 3500 lb. 10.97 et @ 122 mph car. I run 20-22 psi, and it drives like it is on rails. I swap the tires side, to side every 20 or so passes.

CCRT · 05-15-2007, 09:12 AM

Thanks for all the good info here.

We have absolutely no issues at speeds less than 135.

M/T tech stated it could be the Radial rear vs. Bias fronts that are causing the issue. They suggested going down on the pressure of my front tires. (Currently 40-38 psi). They also suggested looking at their S/R series front radials. When I checked out the specs I found they are only rated for 130 mph.

I?m beginning to think that it?s all sidewall related.

Some of the faster cars (160 mph plus) run the ET Street Radials but a set would be 30 lbs heavier. I don?t think they have issues because of the beefier sidewall in the DOT tire.

I?ll try going up on the pressure but unless the track is optimum it could cause a lot of inconsistencies at launch.

--Dave

1967 Camaro, Street Legal, Naturally Aspirated 406 SBC, 3400#, 9" tires 10.03 @ 132.48 1.40 60' Through the exhaust & Foot-Brakin'
9.07@147 with a little juice :-)
http://home.comcast.net/~ccrt-racing/ccrt.htm
CCRT
--Dave

05-12-2007, 08:54 PM	#1
CCRT Junior Member Join Date: May 2007 Location: Westford, MA Posts: 3 Likes: 0 Liked 0 Times in 0 Posts	Radial Slick Top End wig-wag Condition Looking for some help. We run the M/T 3066R 30 x 9 radial slick on our Camaro. Car is 3400lbs Tires set to 17.5 psi. Right around 145 mph the body will wig wag from side to side. Can't feel anything in the steering or chassis. It's all body roll. Back to back testing today switching to a M/T 28 X 10.5 bias ply corrected the condition. I really hate to have to go back to the bias tire. Does any body run these tires at 145-150 mph? Any help or ideas would be greatly appreciated. Thanks, --Dave 1967 Camaro, Street Legal, Naturally Aspirated 406 SBC, 3400#, 9" tires 10.03 @ 132.48 1.40 60' Through the exhaust & Foot-Brakin' 9.07@147 with a little juice :-) http://home.comcast.net/~ccrt-racing/ccrt.htm CCRT --Dave

05-12-2007, 11:42 PM	#2
Kenny Wigington Senior Member Join Date: Sep 2004 Location: Cumming,Ga. USA Posts: 967 Likes: 36 Liked 60 Times in 12 Posts	You have too much vehicle weight for that pressure. Go up , in small increments, until it spins. You'll know when it begins to. You may wind up in the 19 lb range, maybe a little more. A lot of stockers run upwards of 20 lbs, regularly. Good Luck ! I hope they will replace that win light , on my side ! It looks like yours still works ?! STK 2894 __________________ 2894 STK

05-13-2007, 11:19 AM	#3
tpoh815 Senior Member Join Date: Oct 2003 Location: West Seneca Posts: 532 Likes: 54 Liked 28 Times in 11 Posts	it does not hurt to make sure you dont have a broken shock!! __________________ EX 5-Doorstocker

05-13-2007, 01:24 PM	#4
Barry Polley Senior Member Join Date: Dec 2003 Location: Vacaville Ca Posts: 846 Likes: 886 Liked 754 Times in 301 Posts	How many runs on the radials? We changed radials and corrected the problem. In second and third it was hooking and spinning left to right. A two handed deal for sure! Barry __________________ Barry Polley 758 A/SA California Screaming! California- No place to race!

05-13-2007, 10:25 PM	#6
Sean Ward Member Join Date: Apr 2006 Location: Grand Island FL. Posts: 389 Likes: 0 Liked 0 Times in 0 Posts	yeah you need to go up in pressure my car weights 4080# don't run that fast by no means but had same problem with radials at first really bad when i would lift at finsh always felt like assend wanted to pass front end started with 19# but went up in air and took care of the wig wag i run 25#s of air and its like a caddy nice and smooth sean ward stk# 2882 __________________ Sean Ward NHRA s/ss/comp#2882 SW4 MOTORSPORTS

05-13-2007, 08:55 PM	#5
CCRT Junior Member Join Date: May 2007 Location: Westford, MA Posts: 3 Likes: 0 Liked 0 Times in 0 Posts	These have about 40 passes.................... But have done it since day one :-( 1967 Camaro, Street Legal, Naturally Aspirated 406 SBC, 3400#, 9" tires 10.03 @ 132.48 1.40 60' Through the exhaust & Foot-Brakin' 9.07@147 with a little juice :-) http://home.comcast.net/~ccrt-racing/ccrt.htm CCRT --Dave

05-13-2007, 11:04 PM	#7
Barry Polley Senior Member Join Date: Dec 2003 Location: Vacaville Ca Posts: 846 Likes: 886 Liked 754 Times in 301 Posts	Dave, At 3610 we run 20 -21 on a good track. __________________ Barry Polley 758 A/SA California Screaming! California- No place to race!

05-14-2007, 08:00 PM	#8
rallye bob Member Join Date: Sep 2006 Location: Genoa, Illinois Posts: 488 Likes: 9 Liked 6 Times in 4 Posts	Ever try the Hoosier 30 x 9 radial slick? I run them on my 3500 lb. 10.97 et @ 122 mph car. I run 20-22 psi, and it drives like it is on rails. I swap the tires side, to side every 20 or so passes.

05-15-2007, 09:12 AM	#9
CCRT Junior Member Join Date: May 2007 Location: Westford, MA Posts: 3 Likes: 0 Liked 0 Times in 0 Posts	Thanks for all the good info here. We have absolutely no issues at speeds less than 135. M/T tech stated it could be the Radial rear vs. Bias fronts that are causing the issue. They suggested going down on the pressure of my front tires. (Currently 40-38 psi). They also suggested looking at their S/R series front radials. When I checked out the specs I found they are only rated for 130 mph. I?m beginning to think that it?s all sidewall related. Some of the faster cars (160 mph plus) run the ET Street Radials but a set would be 30 lbs heavier. I don?t think they have issues because of the beefier sidewall in the DOT tire. I?ll try going up on the pressure but unless the track is optimum it could cause a lot of inconsistencies at launch. --Dave 1967 Camaro, Street Legal, Naturally Aspirated 406 SBC, 3400#, 9" tires 10.03 @ 132.48 1.40 60' Through the exhaust & Foot-Brakin' 9.07@147 with a little juice :-) http://home.comcast.net/~ccrt-racing/ccrt.htm CCRT --Dave