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Bias ply rear / Radial front = REAR SWAY ??

Discussion in 'Dragstrip and Launching' started by WildHorse, Jul 25, 2020.

  1. WildHorse

    WildHorse N/A or GO HOME

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    Forever I've read running a bias ply rear with a wide-ish radial fronts you get crazy sway going WOT in a straight line with these IRS cars. I dunno about that man. Running 28x11.5.17 ET Street R rears & Firehawk Indy 500 245/40R19 fronts there is zero sway. Street / track / 4x4 trails (haha). It's just hook like a mofo & hang on. In fact, I didn't notice anything unusual other than the bias plys grab the ruts in the street more. So makes me wonder what these guys are doing to get all that sway. Don't wanna get caught off guard haha. Cheers.
    115482129_3184642874963989_7430272741060119113_n.jpg
     
  2. cahouston

    cahouston Well-Known Member

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    What do you have the rear air pressure at? That makes a difference typically.
     
  3. OP
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    WildHorse

    WildHorse N/A or GO HOME

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    18 psi rear / 32 psi front
     
  4. cahouston

    cahouston Well-Known Member

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    That is good you aren't experiencing the sway effect. My 2006 GT had no sway bars and with a radial front tire and MT ET Street bias ply in the back, it definitely had movement at the top of the track. At highway speeds, it felt pretty floaty as well. Street driving below 50mph felt fine. I have run the same 17x9 wheels with the bias ply tires on my '19 GT with stock front wheels and it felt fine under 60mph at 18psi but around 65-70 on the highway, it does not. I definitely felt that movement and like you said they tend to catch and ride the ruts or imperfections in the road surface. I wouldn't consider it dangerous if you know to expect it but it can be unsettling at times.

    Anytime I have street driven a bias ply rear tire, I have taken turns very easily as well. Straight line though, it's a blast!
     
  5. OP
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    WildHorse

    WildHorse N/A or GO HOME

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    Turns ain't to bad. Had to do an pretty violent emergency maneuver to avoid some jackass the cut me off then slammed the brakes cause 'he needed that lane'. Handled it like a champ haha. Somebody told me to pump up the front psi at the track from 32 psi to 42 psi. Regardless though.. I need to get some pizza cutters for up front.
     
  6. Braski

    Braski Well-Known Member

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    With the Hoosiers I had alot of sway even with bias up front. I changed to MT Street bias r's and had zero sway. I was even running them down to 12-14 lbs cold and they felt good. You will pick up a tenth or so and atleast 1+ mph if you go with a skinny upfront.
     
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  7. OP
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    WildHorse

    WildHorse N/A or GO HOME

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    Yeah, this I can confirm.
     
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