M/t radial problem

Dennis Paz · 03-16-2010, 09:28 AM

Bill
I dont know anyone at M/T, Is Carl in so/cal?
Not a balance problem as car is smooth, feels like running on flats with 20 psi.

Ed Wright · 03-16-2010, 09:52 AM

One thing I have found about radials, they tend to do that if the wheels aren't wide enough.
Mine totally stopped doing that after I learned to use wheels wider than the tread area of the tires. I put my 9" radials on 10" wheels, and my 10.5" on 12" wheels. Made a whole new car out of mine. I can run more air, it hooks harder and no more wobble.

Marc LaBrecque · 03-16-2010, 11:47 AM

I've run these tires on my S/Stocker for several years with great sucsess . At first I ran them with a 12" rim and had some wobble . Since going with a 14" rim I run approx 18lbs of tire pressure and I do have a sway bar My truck is absolutley stable no shake . Also about 8-10th quicker and have consistantley put over a hundred runs on them . As in any radial tire make sure all suspinsion is tight .
Marc

buzzinhalfdozen · 03-16-2010, 11:55 AM

I agree the wheel width does seem to have a distinct effect on these tires, wider wheel is preferrable. Joe

Bill Grubbs · 03-16-2010, 12:06 PM

Quote:

Originally Posted by Dennis Paz

Bill
I dont know anyone at M/T, Is Carl in so/cal?
Not a balance problem as car is smooth, feels like running on flats with 20 psi.

Carl...is...M/T.

Call Them and ask to talk to him.

Bill

Ronnie Smith Jr · 03-16-2010, 08:38 PM

Dennis,

Make sure your front end is tight as well. I found in my old car (1st gen Camaro) that we needed to redo the front end. Installed a slightly larger OD center link. Converted the factory type tie rod ends to chrome moly round tube with heim ends. As the others have noted, sway bar or anti-roll will help on the rear and 14" rims.

Another thing to note as well is how the track is prepared. I experienced on marginal tracks I could not use the radials. When it came to National Event prepped type tracks or first class type facilities, I did not have an issue as much as before. I still had wobble but it was manageable.

FWIW

Ronnie, Jr.

Dennis Paz · 03-16-2010, 10:15 PM

Rear wheels are 14 wide. Front end has all new parts from wheel to wheel. Rear is 4 link with diagonal link and koni double adjustables. I think I just have a junk set . The car drives like a dream with the bias plys. If the radial m/t are so sensative I think some phoenix or hoosier radials are in my future. But I will call m/t first and see what they say.

Jody Lang · 03-16-2010, 11:07 PM

Dennis, I have heard of someone wrecking a car due to "radial wobble". Most say it's cured by stiffening the shocks.

My Hoosiers did it at 16 PSI but not at 12 PSI. Never did it once with the bias ply.

Dennis Paz · 03-17-2010, 09:00 PM

I had no idea this was such a common problem. I did stiffen the rear shocks a bunch and it helped enough I could get a full pass but was still a white knuckler. I have the front end way loose with all the usual weight transfer tricks and am thinking that may be half the problem. My car has not got a bunch of power so maybe a lot of transfer wont be needed to keep it happy. Maybe a set of stock coils instead of the moroso springs?? I took off the 90/10 shocks and tryed some 50/50 and made no difference at all.
Thanks for the help.

Rusty Davenport · 03-18-2010, 08:47 AM

I found a cure for the problem........if it scares you bad enough the bias will be just fine

03-16-2010, 09:28 AM	#1
Dennis Paz Junior Member Join Date: Apr 2005 Location: stockton ca Posts: 97 Likes: 0 Liked 5 Times in 3 Posts	Re: M/t radial problem Bill I dont know anyone at M/T, Is Carl in so/cal? Not a balance problem as car is smooth, feels like running on flats with 20 psi.

03-16-2010, 09:52 AM	#2
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: M/t radial problem One thing I have found about radials, they tend to do that if the wheels aren't wide enough. Mine totally stopped doing that after I learned to use wheels wider than the tread area of the tires. I put my 9" radials on 10" wheels, and my 10.5" on 12" wheels. Made a whole new car out of mine. I can run more air, it hooks harder and no more wobble. __________________ Ed Wright 4156 SS/JA

03-16-2010, 11:47 AM	#3
Marc LaBrecque Senior Member Join Date: May 2004 Posts: 706 Likes: 20 Liked 432 Times in 115 Posts	Re: M/t radial problem I've run these tires on my S/Stocker for several years with great sucsess . At first I ran them with a 12" rim and had some wobble . Since going with a 14" rim I run approx 18lbs of tire pressure and I do have a sway bar My truck is absolutley stable no shake . Also about 8-10th quicker and have consistantley put over a hundred runs on them . As in any radial tire make sure all suspinsion is tight . Marc

03-16-2010, 11:55 AM	#4
buzzinhalfdozen Senior Member Join Date: Sep 2006 Location: Bellevue Ohio Posts: 984 Likes: 0 Liked 11 Times in 8 Posts	Re: M/t radial problem I agree the wheel width does seem to have a distinct effect on these tires, wider wheel is preferrable. Joe __________________ Joe Buchanan SS/BX 3117

03-16-2010, 08:38 PM	#6
Ronnie Smith Jr Member Join Date: Sep 2003 Location: Maryland Posts: 220 Likes: 0 Liked 0 Times in 0 Posts	Re: M/t radial problem Dennis, Make sure your front end is tight as well. I found in my old car (1st gen Camaro) that we needed to redo the front end. Installed a slightly larger OD center link. Converted the factory type tie rod ends to chrome moly round tube with heim ends. As the others have noted, sway bar or anti-roll will help on the rear and 14" rims. Another thing to note as well is how the track is prepared. I experienced on marginal tracks I could not use the radials. When it came to National Event prepped type tracks or first class type facilities, I did not have an issue as much as before. I still had wobble but it was manageable. FWIW Ronnie, Jr.

03-16-2010, 10:15 PM	#7
Dennis Paz Junior Member Join Date: Apr 2005 Location: stockton ca Posts: 97 Likes: 0 Liked 5 Times in 3 Posts	Re: M/t radial problem Rear wheels are 14 wide. Front end has all new parts from wheel to wheel. Rear is 4 link with diagonal link and koni double adjustables. I think I just have a junk set . The car drives like a dream with the bias plys. If the radial m/t are so sensative I think some phoenix or hoosier radials are in my future. But I will call m/t first and see what they say.

03-16-2010, 11:07 PM	#8
Jody Lang Member Join Date: Mar 2002 Posts: 306 Likes: 28 Liked 89 Times in 28 Posts	Re: M/t radial problem Dennis, I have heard of someone wrecking a car due to "radial wobble". Most say it's cured by stiffening the shocks. My Hoosiers did it at 16 PSI but not at 12 PSI. Never did it once with the bias ply.

03-17-2010, 09:00 PM	#9
Dennis Paz Junior Member Join Date: Apr 2005 Location: stockton ca Posts: 97 Likes: 0 Liked 5 Times in 3 Posts	Re: M/t radial problem I had no idea this was such a common problem. I did stiffen the rear shocks a bunch and it helped enough I could get a full pass but was still a white knuckler. I have the front end way loose with all the usual weight transfer tricks and am thinking that may be half the problem. My car has not got a bunch of power so maybe a lot of transfer wont be needed to keep it happy. Maybe a set of stock coils instead of the moroso springs?? I took off the 90/10 shocks and tryed some 50/50 and made no difference at all. Thanks for the help.

03-18-2010, 08:47 AM	#10
Rusty Davenport Senior Member Join Date: Jun 2005 Location: Nashville N.C. Posts: 506 Likes: 4 Liked 101 Times in 27 Posts	Re: M/t radial problem I found a cure for the problem........if it scares you bad enough the bias will be just fine