Radial Front Bias Ply Rear Staibility? - Moparts Forums

Register Log In Moparts Forums Unlawfl's Race & Engine Tech Radial Front Bias Ply Rear Staibility?

Print Thread

Page 2 of 3

1

2

3

Re: Radial Front Bias Ply Rear Staibility? [Re: RyanJ] #451846 08/27/09 11:29 PM 08/27/09 11:29 PM
Joined: Aug 2003 Posts: 43,157 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,157 Bend,OR USA	My Duster DOES NOT like mixing bias and radials, either front or rear combinations It(me ) does like bias with bias or radail with radials, bias in the front with radials in the rear isn't to bad, radials on the front with bias on the rear makes me think I've went back to drinking I don't run a big, fat front tire on either set, 26x15 ET fronts or 165x15 radials on the front, both sets are on 4 inch rims this is only on the street, at our local 1/8 mile track the car deosn't talk (act up)to me at all with mixed tires 6:90 at 100 MPH Last edited by Cab_Burge; 08/28/09 02:28 AM. Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Radial Front Bias Ply Rear Staibility? [Re: Triple Threat] #451847 08/27/09 11:48 PM 08/27/09 11:48 PM
Joined: Jan 2003 Posts: 21,071 Niles , Ohio T therocks oh wait.but hey.lets see.oh yeah.
therocks oh wait.but hey.lets see.oh yeah. T Joined: Jan 2003 Posts: 21,071 Niles , Ohio	Ny 65 rides just fine with rads on frt and bias rears.Its street driven and at the track its been to 114 and still tracks straight.Now when I had the MT Sportsman bias on the front it was a total piece of crap street or strip.Rocky Chrysler Firepower

Re: Radial Front Bias Ply Rear Staibility? [Re: therocks] #451848 08/28/09 02:08 AM 08/28/09 02:08 AM
Joined: Nov 2004 Posts: 2,825 Sk. Canada RemCharger master
RemCharger master Joined: Nov 2004 Posts: 2,825 Sk. Canada	Its an abody? Are all the bushings new and tight? strut rods?

Re: Radial Front Bias Ply Rear Staibility? [Re: RemCharger] #451849 08/28/09 02:30 AM 08/28/09 02:30 AM
Joined: Feb 2004 Posts: 4,501 Gainesville,FL G goldmember master
goldmember master G Joined: Feb 2004 Posts: 4,501 Gainesville,FL	I'd dump the radial T/A's,one of the worst tires ever made,unless you want a 60,000 mile crap tire.I've run radials on the front with non radial slicks,non radial street/strip tires and radial rears. No problems,but radial T/A's? Not since 1980 and never again.

Re: Radial Front Bias Ply Rear Staibility? [Re: RyanJ] #451850 08/28/09 06:46 AM 08/28/09 06:46 AM
Joined: Jun 2005 Posts: 2,776 Ontario Canada M MattW master
MattW master M Joined: Jun 2005 Posts: 2,776 Ontario Canada	Quote: I can't remember, but I don't think I have ever ran a car down the track with Radial front, Bias rear until last week (at least a fast car) & am wondering if the majority of my top end wandering issues is from the mis matched tires? I've ran several cars on the street with Radial front/Bias rear combo's & never really had any ill handling issues, but those are generally stiff sidewall bias plys like a M/T INDY Profile. My Road Runner now has 235/60 BF Goodrich Radial TA's up front & 26 X 11.5 Hoosier Quick Time Pros on back for track use.... Last week had rear pressure @ 18PSI, car went 118.4 MPH & was wandering all over the place from about 1/8 mile on, & then decides to do some wicked diving around when I let off after the stripe. I thought I'd make it a little better by trying 24 PSI since junk converter was'nt allowing it to hit tires hard on launch anyhow.... needless to say I let off around 1100' as I was wandering towards the timing boxes @ the traps. I only have a 7" wheel & with the 11.5's with more air actually reduces contact patch.... I ordered a set of 275/60/15 Hoosier Drag Radials this AM & will try those this weekend if weather cooperates. I have a new 4000 Stall PTC 9.5" verter coming at beginning of week, & am hoping I can get car to hook with the DR's once it is in. I've had the car to around 110 on the street with the Hoosiers on & it feels way better stability wise, than it does at the track?? Dunno what is into it... Buddy of mine has a mid 11 sec '70 Chevelle that runs Radial fronts & M/T ET Streets on back & said his does similar wandering around, but he said his really only does it on deceleration... I did'nt really want to try a bias front tire since I drive car every day on street I'd like to keep the Radial TA's on it, because they work well in the rain & taking corners @ speed.. Just wondering what everyone's experiences have been like trying to run 110+ MPH with radial front/Bias rear, especially with a wrinklewall rear tire.... Just feels like rear end is wandering from side to side real bad @ speed & I'm constantly trying to chase it with steering wheel. Not happy with it at all.... Keep in mind that at full trottle the front end is not is the same place as cruising speed. The wide tire sure doesn't help but if it is set up right I don't see problems with mixing tires. In my opinion, most front end wandering is due to poor setup or driving technique. Matt

Re: Radial Front Bias Ply Rear Staibility? [Re: MattW] #451851 08/28/09 07:13 AM 08/28/09 07:13 AM
Joined: Jan 2003 Posts: 9,996 Frostbitefalls MN (Rocky&Bullw... gregsdart master
gregsdart master Joined: Jan 2003 Posts: 9,996 Frostbitefalls MN (Rocky&Bullw...	In my opinion, most front end wandering is due to poor setup or driving technique. Matt Generalizations can get a guy in lots of trouble. The faster a car goes, the worse any particular problem becomes. Based on the fact that as a group we tend to go faster as time goes by, we WILL find problems getting worse. Mixing types of tires is not recommended for a reason, and band aiding the problem with more pressure, wider rims etc is just hiding the problem, and looking for trouble. Case in point, drag slicks of radial construction are so prone to sway at speed Goodyear is coming out with a new radial drag slick with a sidewall construction just to address this issue. The tech guy at Comp Tires west said it will be out in January, roughly. I first had issues back in 2004. M/T radial slicks, 14.5 33 15. Car would swing back and forth so bad I was aborting half the runs I made. I know some will say this is about FRONT radials vs Back bias, but the fact remains, they drive differently and allow the car to move left or right differently based on tire construction. My scenario just amplified the problem into the extreme. I will not mix tires like this again, been to close to putting the car on its' roof more than once. 8..603 156 mph best, 2905 lbs 549, indy 572-13, alky

Re: Radial Front Bias Ply Rear Staibility? [Re: gregsdart] #451852 08/28/09 08:29 AM 08/28/09 08:29 AM
Joined: Jan 2003 Posts: 8,547 State College, PA RyanJ OP moparts member
RyanJ OP moparts member Joined: Jan 2003 Posts: 8,547 State College, PA	Well I'm going to find out 1 step at a time what is causing it. Hopefully if weather is OK I will run it Sunday with the new Drag Radials & see what change that made. If it still is not good, it's going for an alignment next week & will then run it next weekend to see what that does. The front end is not "worn out" etc, I drive it every day & it drives/steers better than any old Mopar I've driven to date. You can hold wheel straight going down the track but the rear end "wanders" around & acts like IT is doing the steering...

Re: Radial Front Bias Ply Rear Staibility? [Re: BradH] #451853 08/28/09 08:34 AM 08/28/09 08:34 AM
Joined: Feb 2007 Posts: 6,295 U.S. M moparniac master
moparniac master M Joined: Feb 2007 Posts: 6,295 U.S.	Quote: I've run bias plies & radials mixed both ways front & back. The only time I had the back end wagging on the big end was entirely due to bias-plies on the rear being run w/ too little air. same here! Mopar Performance

Re: Radial Front Bias Ply Rear Staibility? [Re: RyanJ] #451854 08/28/09 08:36 AM 08/28/09 08:36 AM
Joined: Jan 2003 Posts: 4,573 ...gently down the stream LAR_414 master
LAR_414 master Joined: Jan 2003 Posts: 4,573 ...gently down the stream	Ryan, I've had similar issues. Here's what I think is going on with your car. #1) Wheels aren't wide enough for your tire size #2) Need a stiffer sidewall via more air pressure or run tubes, or both. Just my thoughts from years of messing with stuff on street cars. Have fun and be safe! Larry

Re: Radial Front Bias Ply Rear Staibility? [Re: LAR_414] #451855 08/28/09 08:51 AM 08/28/09 08:51 AM
Joined: Jan 2003 Posts: 6,392 nielsville, minn. Q quickd100 master
quickd100 master Q Joined: Jan 2003 Posts: 6,392 nielsville, minn.	In my case, 10" rims and 10.5" tires. Front end though old and original is as tight as anything new out there. Drives like a new truck on the street. I'm not sawing the wheel back and forth while making a pass, I do have to focus on not doing so with the rear moving around as much as it does. Dave

Re: Radial Front Bias Ply Rear Staibility? [Re: quickd100] #451856 08/28/09 09:28 AM 08/28/09 09:28 AM
Joined: Jan 2003 Posts: 21,071 Niles , Ohio T therocks oh wait.but hey.lets see.oh yeah.
therocks oh wait.but hey.lets see.oh yeah. T Joined: Jan 2003 Posts: 21,071 Niles , Ohio	My 65 I can just about let the wheel go at 100 and it still tracks straight.Never felt the rear move at all.Now when i had the MTs on the front I was fighting it all the time.I knwo the alignment is right as I did it and rechecked it twice after I set it up.Rocky Chrysler Firepower

Re: Radial Front Bias Ply Rear Staibility? [Re: RyanJ] #451857 08/28/09 09:36 AM 08/28/09 09:36 AM
Joined: Nov 2008 Posts: 660 San Diego formula S mopar
formula S mopar Joined: Nov 2008 Posts: 660 San Diego	Quote: Well I'm going to find out 1 step at a time what is causing it. Hopefully if weather is OK I will run it Sunday with the new Drag Radials & see what change that made. If it still is not good, it's going for an alignment next week & will then run it next weekend to see what that does. The front end is not "worn out" etc, I drive it every day & it drives/steers better than any old Mopar I've driven to date. You can hold wheel straight going down the track but the rear end "wanders" around & acts like IT is doing the steering... Ryan make sure when you align your front end that you get as much positive caster as you can, this will help it go straight

Re: Radial Front Bias Ply Rear Staibility? [Re: RyanJ] #451858 08/28/09 01:01 PM 08/28/09 01:01 PM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	The only reason I posted on this thread is because I run similar speeds, have a similar size car with similar tire set up as the original poster - and have had similar wander issues in the past. Trying to compare my issues with some one who has a dedicated race car running in the 140 and above mph range is almost meaningless. My car was never designed ( reads aerodynamic as a box of velveta cheese ) to do what I am asking it to. I think some older cars catch a lot of air under them at speed and this alone creates handling issues. Ride height changes and in old Mopars this often changes alignment specs, aspecially in the camber and toe areas. Pulled the front sway bar off my car earlier this year to try and cut an ugly 40 pounds off the car. Big mistake. Ran in a moderate cross wind and just about saturated my depends. Put it back on. I guess my point is that there is a lot more issues with handling than just tires - although tires obviously play a major roll. Just changing rear tire pressure 5 psi makes a handling difference. Making sure your rear suspension is tight and properly aligned ( to the frame ) is often over looked and Ma Mopar didn't do too good in this area from the factory with old iron. Fastest 300

Re: Radial Front Bias Ply Rear Staibility? [Re: 383man] #451859 08/28/09 04:46 PM 08/28/09 04:46 PM
Joined: Aug 2007 Posts: 498 El Dorado Ca 6 65signet mopar
65signet mopar 6 Joined: Aug 2007 Posts: 498 El Dorado Ca	Quote: I run radial street tires up front and was running the Hoosier Quick Time Pro tires that were 29 x 11.5. The tread was just over 10" as the 11.5 is the width on the Hoosier tires. My 63 runs mid 11's from 114 to 16 and it would wander some on the top end but not real bad. I did notice it would really want to go with the lines in the street when driving on the street and I did not like that when in traffic. They also rubbed on turns as my suspension is stock location with stock body so I decided to try the Hoosier 30 x 9 radial slick. They dont ever rub and wow does it handle like a new car. The car went faster on them once I got it to hook on them and I have been driving with them on the street and they handle way better then any other rear tire I had on the car. The problem is no one makes a 30 x 9 drag radial ! I can only find a radial drag tire of that size in the slicks only and they fit perfect in my wheelwell. So I had the new radial slicks on an 8" wheel and I took the old pair that I had tried first and put them on a 7" wheel and have been driving them on the street since May. They handle so good I wont go back to the QTP tires. I just wish someone made a 30 x 9 drag radial. Ron So you are running the DOT drag radial on the street and have no issues? i am going back and for with this issue and i know they do not recommend these tires or the bias ply drag DOT slick for street use. 1965 Plymouth Barracuda 273 M/SA 1970 Plymouth Duster 360/904 10.60s with J heads

Re: Radial Front Bias Ply Rear Staibility? [Re: 65signet] #451860 08/28/09 07:22 PM 08/28/09 07:22 PM
Joined: Jan 2003 Posts: 8,547 State College, PA RyanJ OP moparts member
RyanJ OP moparts member Joined: Jan 2003 Posts: 8,547 State College, PA	New Drag radials are mounted & new PTC converter goes in in the AM, as long as it does'nt rain Sunday I should have some new bests. The Hoosier DR's sure don't have much "tread" compared to a M/T DR.

Re: Radial Front Bias Ply Rear Staibility? [Re: RyanJ] #451861 08/28/09 09:48 PM 08/28/09 09:48 PM
Joined: Jan 2003 Posts: 6,266 Renton Washington T Triple Threat master
Triple Threat master T Joined: Jan 2003 Posts: 6,266 Renton Washington	Yeah, you've got to be pretty brave to drive the Hoosiers in the rain. But they hook well. -Dustin 67 Dart, 9 second, 392" G3 Hemi 68 Barracuda 340 F/SA

Re: Radial Front Bias Ply Rear Staibility? [Re: Triple Threat] #451862 08/28/09 09:59 PM 08/28/09 09:59 PM
Joined: Jan 2003 Posts: 8,547 State College, PA RyanJ OP moparts member
RyanJ OP moparts member Joined: Jan 2003 Posts: 8,547 State College, PA	I drove my QTP's 65 miles home from track 3 weeks ago in rain whole way, was not that bad. I don't think I'd try it with the DR's though.

Re: Radial Front Bias Ply Rear Staibility? [Re: RyanJ] #451863 08/28/09 11:43 PM 08/28/09 11:43 PM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	I drove about 60 miles a few weeks ago coming home in a light drizzle all the way home on my Hoosier radial slicks. I took it easy and had no problems at all to my surprize. Ron

Re: Radial Front Bias Ply Rear Staibility? [Re: 383man] #451864 08/29/09 12:29 AM 08/29/09 12:29 AM
Joined: Dec 2005 Posts: 3,589 Topeka Kansas K ksj master
ksj master K Joined: Dec 2005 Posts: 3,589 Topeka Kansas	This is a manual tranny guy running radial front and bias M/T's and now running 10.30s and drives it everywhere and has done DragWeek the last four years.And he uses the clutch while rowing the gears. http://s279.photobucket.com/albums/kk141...edcuda10618.flv

Re: Radial Front Bias Ply Rear Staibility? [Re: RyanJ] #2923371 05/17/21 07:51 AM 05/17/21 07:51 AM
Joined: Aug 2008 Posts: 4,068 Mo. racerx master
racerx master Joined: Aug 2008 Posts: 4,068 Mo.	Researching front radial fronts and came across this thread, Lot of good info in here .My question here is How will a radial front work with a stiff sidewall Bias ply rear tire i no it won't work as nice as radials front/rear but i'm wanting to make the switch to all radials but the pockets say no.....your thoughts on this?

Page 2 of 3

1

2

3

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1