Minimum side clearance on slicks?

Mopar Racers Forum

  1. Cope

    Cope Fusing with fire

    Messages:
    2,446
    Likes Received:
    1838
    Joined:
    Oct 20, 2009
    Location:
    San Jose, Ca.
    Local Time:
    3:37 AM
    My buddy from Hitman racing came over today to seem my mini tubs.
    He took one look and said "Nope, that ain't gonna work"

    He thinks on launch when the car twists its gonna ketch the sidewall on the inner fender and outer fender lip, destroying the tire and my quarter.

    These guys build serious race cars and know what they're talking about.
    He says cut the frame and make more room now before I shorten the axle, or hurt my car, my self or some poor bystander.

    He want me to cut 1 1/4 inch out of the frame giving me 2 1/8" on each side
    At this point I may as well just start over and back half the dam car... he's a good friend and some one I fully trust when it comes to what works, what's safe, what's not and what just may get you killed...

    The only good news he had was that he will lend me his axle jig so I dont have to pay to get mine done...



    I got about one inch on each side of the tire. What do you think, not enough?
     
    • Like Like x 1
    • Agree Agree x 1
    • MichaelB.

      MichaelB. Well-Known Member

      Messages:
      184
      Likes Received:
      149
      Joined:
      Mar 29, 2008
      Location:
      Central US of A
      Local Time:
      3:37 AM
      Hey, if you trust him then follow his judgement.

      I drag race my 408 stroker Dart on slicks with Cal-Tracs @ about 1/4 inch of fender clearance. Meaning you have considerably more then I do. Doesn't mean I am right, just means I do it with my set up. IMG_8849.jpg
       
      • Like Like x 5
      • Agree Agree x 2
      • 451Cuda

        451Cuda Well-Known Member

        Messages:
        1,806
        Likes Received:
        522
        Joined:
        Nov 19, 2008
        Location:
        Port-aux-Français, TF
        Local Time:
        3:37 AM
        An inch on each side isn't enough? Plenty of cars have that or a little less and never rub.

        Is this friend a drag racer, or circle track?
         
        • Like Like x 4
        • Cope

          Cope Fusing with fire

          Messages:
          2,446
          Likes Received:
          1838
          Joined:
          Oct 20, 2009
          Location:
          San Jose, Ca.
          Local Time:
          3:37 AM
          He's a drag racer but he is running almost 1,600 HP so maybe that's why he want so much room?
           
          • Agree Agree x 3
          • TrailBeast

            TrailBeast Slightly Twisted Member

            Messages:
            19,224
            Likes Received:
            5567
            Joined:
            Mar 11, 2011
            Location:
            Arizona
            Local Time:
            2:37 AM
            Surely you have seen videos where the slicks turn into bowls of jello.

             
            • Like Like x 2
            • Cope

              Cope Fusing with fire

              Messages:
              2,446
              Likes Received:
              1838
              Joined:
              Oct 20, 2009
              Location:
              San Jose, Ca.
              Local Time:
              3:37 AM
              Yeah, one of his concerns was if the car goes sideways at high RPM.

              I guess this is one of those posts where I'm just looking for the answer I want when I already know the answer I dont like..

              Cut it all out and start over....
               
              • Like Like x 1
              • harrisonm

                harrisonm Well-Known Member

                Messages:
                1,890
                Likes Received:
                1169
                Joined:
                Jan 16, 2005
                Location:
                Topeka, KS
                Local Time:
                9:37 AM
                I'd be happy with the static clearance you have. During hard acceleration (and spinning), Slicks get taller and narrower.
                 
                • Like Like x 1
                • Agree Agree x 1
                • j par

                  j par Well-hung Member

                  Messages:
                  11,201
                  Likes Received:
                  4185
                  Joined:
                  Jul 2, 2014
                  Location:
                  Portland Oregon
                  Local Time:
                  1:37 AM
                  I think yes under acceleration they get taller and skinnier but I believe what the Builder or his friend was saying is when you drop off the throttle they sponge down and it gets a little sideways now they're fat soft and stretching sideways in the wall if it gets left or right out of control a little bit? Now this is just what I'm thinking in my head.
                   
                • harrisonm

                  harrisonm Well-Known Member

                  Messages:
                  1,890
                  Likes Received:
                  1169
                  Joined:
                  Jan 16, 2005
                  Location:
                  Topeka, KS
                  Local Time:
                  9:37 AM
                  I do see what you are saying, but will they get any 'fatter' during deceleration than they are when static? During deceleration, there is more weight on the nose.
                   
                  • Like Like x 1
                  • j par

                    j par Well-hung Member

                    Messages:
                    11,201
                    Likes Received:
                    4185
                    Joined:
                    Jul 2, 2014
                    Location:
                    Portland Oregon
                    Local Time:
                    1:37 AM
                    I guess because I have leaf springs and my car raises under acceleration and kind of drops it's weight under decelerating. When I hit the brakes it seems like the weight rolls forward and off the back a bit. I don't know if you're supposed to accelerate decelerate hit the brakes when things get all out of whack on one of those 9 second runs? I think the suggestion that his friend was making- when you're trying to real some nasty happenin's back in that's not when you want a tire to go down!?
                     
                  • whit68

                    whit68 Well-Known Member

                    Messages:
                    67
                    Likes Received:
                    16
                    Joined:
                    Jan 22, 2013
                    Location:
                    Perth
                    Local Time:
                    5:37 PM
                    It’s all good while everything goes to plan! I think your clearance will be fine as long as everything hooks up well but if it all gets out of shape and those big ass tyres start to wobble then you risk tearing up you nice clean panels and shiny paint.

                    I’d be taking the advice and adding extra clearance while you can (do it once, do it right).

                    Cheers
                    Anthony

                     
                  • Abodybomber

                    Abodybomber Breaking street machines , since 1983.....:) Legendary Member

                    Messages:
                    32,085
                    Likes Received:
                    10479
                    Joined:
                    May 21, 2011
                    Location:
                    Arroyo grande ca
                    Local Time:
                    1:37 AM
                    Horse power ,tire size, and torque multiple, come into big effectively, here ...Your asking the question ( s) ,here ..
                    Dyno the engine first,see the peaks between peak torque, and horsepower peaks... .finding the spread, will set this... Ask lots of questions...
                     
                  • famous bob

                    famous bob mopar misfit

                    Messages:
                    11,233
                    Likes Received:
                    2783
                    Joined:
                    Aug 14, 2011
                    Location:
                    okla
                    Local Time:
                    3:37 AM
                    I ain`t got that much on my drag radials for the street, they just barely touch on an off camber turn Inside, have about 1" on the outside /never touches. I know a lady that has a 10 second 340 barracuda that has a 1/2"to the springs w/10" slicks and she doesn`t have a problem.
                    Probly depends on how much squirm ur gonna have ! Sway bar, rear end locator, 1600 h.p. ??
                     
                    • Agree Agree x 2
                    • Like Like x 1
                    • moparcrazy

                      moparcrazy Well-Known Member

                      Messages:
                      363
                      Likes Received:
                      46
                      Joined:
                      Dec 26, 2009
                      Location:
                      America the Great !
                      Local Time:
                      3:37 AM
                      first question is what tire are you running, Im using drag radials and they don't grow like a Bias ply also what kinda power are we talking 500? 800? 1200? One inch sounds like plenty to me I have about 1/4 inch on the inside with drag radials 800HP car.

                      LETS SEE SOME PICS PLEASE :lol:
                       
                      Last edited: Oct 5, 2018
                    • TrailBeast

                      TrailBeast Slightly Twisted Member

                      Messages:
                      19,224
                      Likes Received:
                      5567
                      Joined:
                      Mar 11, 2011
                      Location:
                      Arizona
                      Local Time:
                      2:37 AM
                      Allow me to put things in perspective for you, as if you didn't already realize it.:D
                       
                    • j par

                      j par Well-hung Member

                      Messages:
                      11,201
                      Likes Received:
                      4185
                      Joined:
                      Jul 2, 2014
                      Location:
                      Portland Oregon
                      Local Time:
                      1:37 AM
                      So by these standards we should all be mini tubbing just for what we have now let alone putting a seriously big tire under there?
                      I think there's many levels of cars and the amounts they are used and the amounts of risk people are willing to take with them. For instance your weekend warrior with four or five maybe six hundred horsepower can probably get away with lower clearances on an every other weekend basis.
                      On the other hand when you're talking a career racer who races daily with 1600 horsepower or more they are are in danger way more often and are taking way more precautions.
                      Safety is their number one concerne when they get to pull the trigger on 1600 horses everyday no problem.
                       
                      • Agree Agree x 2
                      • moparcrazy

                        moparcrazy Well-Known Member

                        Messages:
                        363
                        Likes Received:
                        46
                        Joined:
                        Dec 26, 2009
                        Location:
                        America the Great !
                        Local Time:
                        3:37 AM
                        31x16.5x15 Radial's Dont grow, like bias ply. cars been tubed with spring relocation Kit, Not Backhalf
                        IMG_0096.JPG IMG_0096.JPG IMG_0137.JPG IMG_0065.JPG
                         
                        Last edited: Oct 5, 2018
                        • Like Like x 4
                        • Projectile Dart

                          Projectile Dart Active Member

                          Messages:
                          41
                          Likes Received:
                          21
                          Joined:
                          Jun 30, 2017
                          Location:
                          Long Beach, CA
                          Local Time:
                          1:37 AM
                          Wow what a beautiful rear end view! I think my girlfriend might get jealous
                           
                          • Agree Agree x 2
                          • roccodart440

                            roccodart440 Well-Known Member

                            Messages:
                            4,969
                            Likes Received:
                            3959
                            Joined:
                            Apr 19, 2010
                            Local Time:
                            4:37 AM
                            I call BS. I run slicks with 1/2" maybe and I run them on the street. They scrub slightly on tight 90 degree turns or where the ground gets really uneven where the chassis has to articulate.

                            They definitely don't scrub on launch and if it gets sideways at drag strip speeds your done anyway half the time.

                            With stock springs you'll gain clearance at launch as seen below.

                            60391970-DSC07017.jpg

                            660ft June 14th 2015.jpg
                             
                            • Like Like x 1
                            • flyfish

                              flyfish C8H18+N2O = :-D

                              Messages:
                              1,689
                              Likes Received:
                              185
                              Joined:
                              Apr 16, 2007
                              Location:
                              Indy
                              Local Time:
                              4:37 AM
                              If you can fit your fingers between the tire and fender/chassis then you're fine (roughly 3/4"-1" ish). This was my rule of thumb when I built my car, and it works just fine.
                               
                              • Agree Agree x 2
                              • Like Like x 1
                              • roccodart440

                                roccodart440 Well-Known Member

                                Messages:
                                4,969
                                Likes Received:
                                3959
                                Joined:
                                Apr 19, 2010
                                Local Time:
                                4:37 AM
                                One thing worth mentioning that no one has touched on is making sure there are no sharp edges anywhere in your wheel well.
                                 
                                • Agree Agree x 1
                                • Demonracer

                                  Demonracer 71 Demon 00 Ram 16 Chrysler 300S 05 Caravan FABO Gold Member

                                  Messages:
                                  2,064
                                  Likes Received:
                                  241
                                  Joined:
                                  Jan 31, 2010
                                  Location:
                                  Cleveland, Texas
                                  Local Time:
                                  3:37 AM
                                  Rocco hit the nail on the head, "no sharp edges". My 10 second Demon running 29.5 x 10.5 x 15 has between 1/2" & 5/8" left & right respectively. I've been running it that way for about 10 years.
                                   
                                  • Agree Agree x 1
                                  • Cudafever

                                    Cudafever Well-Known Member

                                    Messages:
                                    2,632
                                    Likes Received:
                                    388
                                    Joined:
                                    Sep 27, 2009
                                    Local Time:
                                    2:37 AM
                                    Them are some big tire. Think about that slow mo video.
                                    Think about the play in the leaf spring/ shackle and then thing about that small end play in you axle......they could all add up to a problem.
                                    My tires are way smaller than yours. have a finger width between the spring clamp and side wall of slicks.
                                    has never rubbed.
                                    wheel lip is above the slick.

                                    Honestly, i would have to suggest you read post 15 again.:steering:
                                     
                                  • fishmens67

                                    fishmens67 Well-Known Member

                                    Messages:
                                    6,136
                                    Likes Received:
                                    2035
                                    Joined:
                                    Nov 10, 2012
                                    Location:
                                    idaho
                                    Local Time:
                                    3:37 AM
                                    Do it right the first time, save money in the long run when you go bigger tire, We are always looking for more power and will be in need of a BIGGER tire. I've spent time and tons of money over the years redoing stuff.
                                     
                                    • Like Like x 1
                                    • roccodart440

                                      roccodart440 Well-Known Member

                                      Messages:
                                      4,969
                                      Likes Received:
                                      3959
                                      Joined:
                                      Apr 19, 2010
                                      Local Time:
                                      4:37 AM
                                      No one here needs more than a 10.50 slick. No one.

                                      Small tire car now run over 200mph, run sub 1 second 60ft times and can have HP in the thousands.
                                       
                                      • Like Like x 1
                                      • Agree Agree x 1
                                      1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
                                        By continuing to use this site, you are consenting to our use of cookies.