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high speed wobble anyone?? #1149967 01/03/12 01:59 PM 01/03/12 01:59 PM
Joined: Dec 2009 Posts: 28 Saskatoon,Saskatchewan. Canada H HEMIBERT588 OP member
HEMIBERT588 OP member H Joined: Dec 2009 Posts: 28 Saskatoon,Saskatchewan. Canada	I recently put on some hoosier 32 x 14.5 radial tires after running bias tires for years. from half track on the car would shake from the rear side to side and increase with wheel speed. this has never happened before. its a 4 link chassis car, qa1 coil overs and there is nothing broke or bent. the car was running mid 8's around 160mph and everything looks fine but sure doesnt feel that way. i was running between 7 and 14 psi in the tires with no change. has anyone had this type of problem?

Re: high speed wobble anyone?? [Re: HEMIBERT588] #1149968 01/03/12 02:01 PM 01/03/12 02:01 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Did you balance the tires

Re: high speed wobble anyone?? [Re: MR_P_BODY] #1149969 01/03/12 02:09 PM 01/03/12 02:09 PM
Joined: Jan 2003 Posts: 19,367 Las Vegas Al_Alguire I Live Here
Al_Alguire I Live Here Joined: Jan 2003 Posts: 19,367 Las Vegas	What he said... "I am not ashamed to confess I am ignorant of what I do not know." "It's never wrong to do the right thing"

Re: high speed wobble anyone?? [Re: HEMIBERT588] #1149970 01/03/12 02:17 PM 01/03/12 02:17 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Also while its on the balancer, check the runout on them and out of round.... most big slicks that I have used took a FAIR/to alot amount of weight

Re: high speed wobble anyone?? [Re: MR_P_BODY] #1149971 01/03/12 02:25 PM 01/03/12 02:25 PM
Joined: Jan 2003 Posts: 5,762 Hot Rod Ridge FastmOp master
FastmOp master Joined: Jan 2003 Posts: 5,762 Hot Rod Ridge	U need radials on the front too.

Re: high speed wobble anyone?? [Re: MR_P_BODY] #1149972 01/03/12 02:30 PM 01/03/12 02:30 PM
Joined: Dec 2009 Posts: 28 Saskatoon,Saskatchewan. Canada H HEMIBERT588 OP member
HEMIBERT588 OP member H Joined: Dec 2009 Posts: 28 Saskatoon,Saskatchewan. Canada	Yes they were balanced, now running radials on the front i think can also be an issue. its seems like the car was trying to get up on the tire and thats what caused the wobble. if i got out of the gas even at 100mph it quit right away, get back on the gas and its back.

Re: high speed wobble anyone?? [Re: HEMIBERT588] #1149973 01/03/12 02:39 PM 01/03/12 02:39 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: Yes they were balanced, now running radials on the front i think can also be an issue. its seems like the car was trying to get up on the tire and thats what caused the wobble. if i got out of the gas even at 100mph it quit right away, get back on the gas and its back. Well if you can get out of the gas and it goes away then you get back on it and its back it isnt the tires... check pinion angle and the drive shaft

Re: high speed wobble anyone?? [Re: HEMIBERT588] #1149974 01/03/12 03:26 PM 01/03/12 03:26 PM
Joined: Sep 2007 Posts: 876 Arizona PolyDart super stock
PolyDart super stock Joined: Sep 2007 Posts: 876 Arizona	Quote: Yes they were balanced, now running radials on the front i think can also be an issue. its seems like the car was trying to get up on the tire and thats what caused the wobble. if i got out of the gas even at 100mph it quit right away, get back on the gas and its back. I recently had a similar problem with a new pair of wrinkle walls. Had them balanced by the same guy, at the same place I have always had them done. Shook like an SOB. I checked the wheel weights on both tires and saw that one had a really big weight on it. Took all the weights OFF that wheel and the problem went away. No shake, no problem, what so ever. Last edited by ab7fh; 01/03/12 03:27 PM. 1970 Dart Resto-Race Project 1960 Dodge Dart Seneca Dual Quad 390 Poly

Re: high speed wobble anyone?? [Re: HEMIBERT588] #1149975 01/03/12 03:27 PM 01/03/12 03:27 PM
Joined: Nov 2003 Posts: 3,434 Dandridge TN D Dabee master
Dabee master D Joined: Nov 2003 Posts: 3,434 Dandridge TN	Check your rack and pinion. I had the same problem you are having. About halfway down the track the car would start to wobble, let up and it would go away. I found the rack and pinion was loose. I tightened up the rack mounts, problem solved.

Re: high speed wobble anyone?? [Re: Dabee] #1149976 01/03/12 03:53 PM 01/03/12 03:53 PM
Joined: Dec 2009 Posts: 28 Saskatoon,Saskatchewan. Canada H HEMIBERT588 OP member
HEMIBERT588 OP member H Joined: Dec 2009 Posts: 28 Saskatoon,Saskatchewan. Canada	Thank you all for your input, i just think its weird that the ONLY thing i changed was the tires and it caused that much of a problem. i will for sure go over everything again.

Re: high speed wobble anyone?? [Re: HEMIBERT588] #1149977 01/03/12 04:21 PM 01/03/12 04:21 PM
Joined: Oct 2004 Posts: 1,752 detroit area M moderncylinder top fuel
moderncylinder top fuel M Joined: Oct 2004 Posts: 1,752 detroit area	run 16lbs,,, at 14 lbs it might get down the track,, anything less than that id be shocked if it even left the line without balling the tires up your problem "radial wobble" has been known about for years,,,, the guys i know who run hoosiers run 16lbs to cure it

Re: high speed wobble anyone?? [Re: moderncylinder] #1149978 01/03/12 04:57 PM 01/03/12 04:57 PM
Joined: Aug 2003 Posts: 43,202 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,202 Bend,OR USA	Quote: run 16lbs,,, at 14 lbs it might get down the track,, anything less than that id be shocked if it even left the line without balling the tires up your problem "radial wobble" has been known about for years,,,, the guys i know who run hoosiers run 16lbs to cure it Don't forget that every tire gauge does not read exactly the same, most of the smaller drag radials I have race on like 18lbs + up to 22 lbs. I have several tire gauges, including a very high dollar C gauge, it reads different than the other less expensive gauges form Moroso and Mr Gasket do I use one higher pressure gauge for the radials and another low pressure for the bias plys, I learned a long time ago to not loan out the good tires gauges to anyone at the races, especially the kids that drove there cars to the tract that didn't have thier own guages I will take my gauges, both high and low pressure gauges, and check thier tire pressures for them I had three low pressure gauges ruined by novice racers Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: high speed wobble anyone?? [Re: moderncylinder] #1149979 01/03/12 06:18 PM 01/03/12 06:18 PM
Joined: Dec 2006 Posts: 4,647 aotearoa rebel master
rebel master Joined: Dec 2006 Posts: 4,647 aotearoa	Quote: run 16lbs,,, at 14 lbs it might get down the track,, anything less than that id be shocked if it even left the line without balling the tires up your problem "radial wobble" has been known about for years,,,, the guys i know who run hoosiers run 16lbs to cure it i'm guessing you're not running the 32x14's as originally posted. i do & found 8psi is the optimum for my car. 10psi+ just wears the center out too fast with cords showing in the middle & still having depth in the indicators on the side.

Re: high speed wobble anyone?? [Re: rebel] #1149980 01/03/12 06:59 PM 01/03/12 06:59 PM
Joined: Jul 2004 Posts: 487 D Dyno1 mopar
Dyno1 mopar D Joined: Jul 2004 Posts: 487	Like Jeff said, this has been a problem for years with the big drag radials. It seems to be a problem with some cars more than others. A sway bar in the back helps alot, plus keep the tires up in air. Good luck. Dyno

Re: high speed wobble anyone?? [Re: rebel] #1149981 01/03/12 07:21 PM 01/03/12 07:21 PM
Joined: Dec 2009 Posts: 28 Saskatoon,Saskatchewan. Canada H HEMIBERT588 OP member
HEMIBERT588 OP member H Joined: Dec 2009 Posts: 28 Saskatoon,Saskatchewan. Canada	These are an actual radial slick, no tread grooves at all. hoosier 32 x 14.5R 15's i think they are also a fairly new tire.

Re: high speed wobble anyone?? [Re: Dyno1] #1149982 01/03/12 07:28 PM 01/03/12 07:28 PM
Joined: Dec 2009 Posts: 28 Saskatoon,Saskatchewan. Canada H HEMIBERT588 OP member
HEMIBERT588 OP member H Joined: Dec 2009 Posts: 28 Saskatoon,Saskatchewan. Canada	thanks again for all your input, i will now have to wait and try it again!!

Re: high speed wobble anyone?? [Re: HEMIBERT588] #1149983 01/03/12 08:14 PM 01/03/12 08:14 PM
Joined: Oct 2007 Posts: 422 Columbus, OH B Ben Holt mopar
Ben Holt mopar B Joined: Oct 2007 Posts: 422 Columbus, OH	I agree on the radial wobble scenario. Tire pressure and shock settings are the two most important things to play with to help fix it.

Re: high speed wobble anyone?? [Re: HEMIBERT588] #1149984 01/04/12 12:11 AM 01/04/12 12:11 AM
Joined: Jun 2010 Posts: 248 Ohio aquamist60 enthusiast
aquamist60 enthusiast Joined: Jun 2010 Posts: 248 Ohio	Quote: These are an actual radial slick, no tread grooves at all. hoosier 32 x 14.5R 15's i think they are also a fairly new tire. I think what is meant are the depth "dots" not grooves. All of the wide tires we used on a Hemi Altered had the dots to show "tread depth".

Re: high speed wobble anyone?? [Re: aquamist60] #1149985 01/06/12 09:54 AM 01/06/12 09:54 AM
Joined: Jan 2003 Posts: 426 Cairns Queensland Australia. T... V vc360 mopar
vc360 mopar V Joined: Jan 2003 Posts: 426 Cairns Queensland Australia. T...	More air like Jeff said even 18-20 and dont use a radial on the front its gets worse IMO.

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