Home Forums Chassis & Handling Ask TJ

Viewing 22 reply threads
  • Author
    Posts
    • #37308
      Jim Silverheels
      Participant

      Ok TJ you’ve had enough rest in the forums.. Can we discuss rear tire coning reasons and remedies please? Thanks

    • #37344
      TJ Koyen
      Moderator

      You’re talking excess wearing on the inner edge I’m assuming?

      Driver/Coach/Wrench : Innovative Performance/Exprit
      Owner : Oktane Visual - www.oktanevisual.com
      www.facebook.com/oktanevisual
      www.instagram.com/oktanevisual

    • #37348
      Jim Silverheels
      Participant

      Yeppers, my take is the kart isn’t rotating enough. Raise seat, more castor,or my positive camber?

    • #37386
      FREDDY SANDOVAL
      Participant

      Jim

      I know this question is directed to TJ, and I do respect that

      But I couldn’t help but to ask a little more, just to be clear, as I am very curious about it now.

      Are we talking coning ( inside shoulder tire wear) In all 4 tires? or just 1 or 2, or fronts, or rear?

      Please specify. With all seriousness I really interested on this topic.

    • #37391
      TJ Koyen
      Moderator

      Jim,

      If you could take a picture that would help greatly. Pics of the front tires would be good too.

      Tires will always wear more on the inside shoulder. If your rears are wearing excessively on the inside and have some feathering, it’s usually from an oversteer condition. I see it a lot on karts that are too soft in the rear. It seems like the kart tends to squat in the corners, lose traction, and slide on the inside edge of the tire.

      But you say you think it needs to rotate more?

      Driver/Coach/Wrench : Innovative Performance/Exprit
      Owner : Oktane Visual - www.oktanevisual.com
      www.facebook.com/oktanevisual
      www.instagram.com/oktanevisual

    • #37406
      Jim Silverheels
      Participant

      TJ, I think if the rear cones it’s because the axle is too soft, seat too low, rear too wide, or too soft in the rear preventing the kart from rotating over enough to the outside of the rear tires, correct? thanks

      Fast Freddy, we might have to charge you an entrance fee to this topic! tee hee

    • #37431
      TJ Koyen
      Moderator

      Or you could be over-lifting the inside rear on entry because it’s so soft, causing the rear to set back down again right away.

      Driver/Coach/Wrench : Innovative Performance/Exprit
      Owner : Oktane Visual - www.oktanevisual.com
      www.facebook.com/oktanevisual
      www.instagram.com/oktanevisual

    • #37501
      Jim Silverheels
      Participant

      Tee Jayer, as your first choice for more turn in, do you widen the front end, give it  more caster, or give it more ackerman please? thanks

    • #37504
      TJ Koyen
      Moderator

      Widen the front 5mm each side, then caster, then Ackermann as a last resort.

      There’s other things I would do in-between some of those steps. Front bar changes and small track-width changes are my go-to changes for front grip adjustments usually. Increasing caster and widening the front essentially do the same thing, but track width is easier and faster to do and you can make smaller increment adjustments.

      Driver/Coach/Wrench : Innovative Performance/Exprit
      Owner : Oktane Visual - www.oktanevisual.com
      www.facebook.com/oktanevisual
      www.instagram.com/oktanevisual

    • #37535
      FREDDY SANDOVAL
      Participant

      Jim

      I agree with TJ

      Our home track is extremely hard on tires, and you can see that type of tire wear a lot, unfortunately most guys like to go with the softer axle, so yeah it will develop inside shoulder tire wear.

      You can avoid tire wear on the front by creating more positive camber, but it will sacrifice some of the handling.

      And as for the rear goes, there is really no way around it, unless you install a harder axle, it will in fact reduce the inside tire wear, but will of course create a change in your tuning.

      Some times is more important to win a race if it costs you a set of tires, rather than conserving the tires and finishing towards the back.

      We can only do a 3 heat race per set of new tires, and after that they’re pretty much good for a CAN race, or hot laps, or practice (once we flip them over, they’re good to go) My 2 cents. ;)

       

      And yes, I know! You’re right Jim, I should start paying a royalty fee for over posting here

      But my name looks so pretty on every topic, and every section of this forum

      Looks like a Christmas tree. :) So pretty!

    • #37647
      Jim Silverheels
      Participant

      Tee,

      with your connections can you ask around what the x30’s are putting out for hp on the dynos? My  dyno says 27.3 hp for my x30 and it runs about equal to others with the same engine. I know this is  the wrong forum for this topic, but with yer star power maybe I wont get chastised for it !   thanks    and chi wa wa

    • #37662
      TJ Koyen
      Moderator

      Jim,

      Every dyno is different so it would be impossible to compare. All I could say is 27-28 sounds about right for what I’ve seen in the past.

      Driver/Coach/Wrench : Innovative Performance/Exprit
      Owner : Oktane Visual - www.oktanevisual.com
      www.facebook.com/oktanevisual
      www.instagram.com/oktanevisual

    • #37677
      Jim Silverheels
      Participant

      Tee

      I wonder where they get those 30 hp readings from for the x30’s they advertise. I think Fast Freddy might be behind it!

       

    • #38004
      Jim Silverheels
      Participant

      Tee

      Do you go to an axle change as a last resort when everything else fails to work? In other words axle choice isn’t a first choice for handling? thanks

    • #38007
      TJ Koyen
      Moderator

      Yup, I’m lazy so if I can avoid changing an axle, I try my best to do so.

      Axle change is a pretty big change, one of the biggest you can make, so it makes sense to try and tweak with smaller adjustments first. The thing I’ve learned over the years is that it’s very easy to make too big of an adjustment in desperation only to flip-flop your handling issues the opposite way and make no progress.

      We used to make pretty big changes (or several adjustments at a time, which is a no-no) and then when the handling didn’t feel any better or we didn’t pick up time, we would then make a bigger change for the next session. Pretty soon we were just throwing huge changes at it in desperation and we ended up with some wack setup that was super far off baseline and the kart was never going to work.

      Small adjustments are best.

      Driver/Coach/Wrench : Innovative Performance/Exprit
      Owner : Oktane Visual - www.oktanevisual.com
      www.facebook.com/oktanevisual
      www.instagram.com/oktanevisual

    • #38071
      Tim Koyen
      Participant

      Hey!  Stop giving away my setup process…lol.

      “…Pretty soon we were just throwing huge changes at it in desperation and we ended up with some wack setup that was super far off baseline and the kart was never going to work.”

      KartLift Kart Stands
      DeepSeat Kart Seats
      877-777-8020
      ------------------
      Don't bother PMing me, it doesn't work. Email is best: tim@kartlift.com.

    • #38163
      FREDDY SANDOVAL
      Participant

      Hey, Jim
      Sorry I didn’t reply, I was really busy racing here
      But yeah, I could be behind the top secret of those engines
      Send me a check in the mail, and I’ll tell you all about it. Lol
      Just remember, There is a reason why some motors are hand picked by builders, they go through a handful of cases and they find the one they fall in love with, they massage it, they talk to it ( when no one’s looking ) and they’re all by them selves at the shop, they even give them names, like “KRAZY HORSE, BLUE MOON, MY SWEET HEART, MONY MAKING MACHINE, ETC.

      It is very hard to get accurate readings, exact readings from one engine to another, as mentioned above.

    • #38205
      TJ Koyen
      Moderator

      We prefer to name engines after Michael Jackson songs. Our two top-shelf Franklin Leopards were “PYT” and “Smooth Criminal”. Better engines got better songs. Not sure if we ever found a “Thriller” or not, that name was being saved for the ultimate engine. But the shop had a “Dirty Diana” as well as a “Janet” too.

      Just sold “Smooth Criminal”, it was sad day.

      Driver/Coach/Wrench : Innovative Performance/Exprit
      Owner : Oktane Visual - www.oktanevisual.com
      www.facebook.com/oktanevisual
      www.instagram.com/oktanevisual

    • #38207
      Jim Silverheels
      Participant

      I like the names of the engines. The people I know who have dog engines usually name their’s E BAY…  TEE HEE

    • #38209
      Jim Silverheels
      Participant

      Fast Freddy, ever git that k-100 to put out psi on compression?

    • #38228
      FREDDY SANDOVAL
      Participant

      Yes, I did, and manage to win the championship with it. Thank God!
      What a pain in the butt it was, frustrating also.
      We had the option of other fresh engines we’ve got on the shelf, but I really wanted to find out about this one first.

    • #38235
      Jim Silverheels
      Participant

      Fast Freddie, grats on yer championship. The forum family is happy for ya. Now, what shall we tackle next to better ourselves? 

    • #38242
      FREDDY SANDOVAL
      Participant

      Well, we could talk about ways how to improve our sport, encourage people that are new or wanting to get started, support them and maintain them so that they keep learning and getting better at it.

      We can also talk about jokes, I love clean killer jokes

      We can talk about Christmas, Jesus, the love of Christ for us

      We can talk about tire coning, etc. Lol ;)

Viewing 22 reply threads
  • You must be logged in to reply to this topic.