August 7, 2015 at 12:25 pm #52571
So, lately I’ve been struggling with the setup of my kart, in that once the tires get up to temp turning left becomes a huge risk of having way too much grip and two wheeling up badly. Here are some points to take into account.
I have no weights and minimal fuel on-board as I weigh 185lb and can nearly make weight with no fuel. Chassis has been checked to be straight, steering alined, rear track width as wide as legal.
I’m thinking it mostly has to do with poor weight distribution, I’m just trying to figure out how to fix this asymmetrical issue with the kart.
Kart: Intrepid F4k 2012
Class: Sr. (340lbs)
August 7, 2015 at 5:01 pm #52581
Assuming nothing is bent (including steering components), and your front is is properly aligned then it’s probably weight distribution side to side. Have you scaled it yet? If not, start there and you’ll have a good idea of what to change.
If you don’t have access to good scale setup, then just invest in a set of cheap bathroom scales. They work fine as long as you are careful and can repeat the scaling the same way each time. (well, that goes for a good scale setup too).
BTW: I remember reading somewhere you can scale with just one or 2 scales. Maybe someone can chime in on that procedure….
August 7, 2015 at 7:57 pm #52590
How high off the ground is your seat? How tall are you?
How wide or narrow is your front track?
What air pressures are you running? And what kind of tires?
Are you running seat struts or not?
Look for cracks under the frame rails, it will cause that too.
Are you running front and rear torsion bars?
Let us know what chassis this is.
August 8, 2015 at 6:02 am #52595
I would make changes in this order
1. Lower the seat so that the top lip is 8″ off the axle. Have the bottom 1/4″ below the frame.
2. Raise the rear axle to lower frame.
3. Thinking outside the box you can move the RR out 1/2″ and move the LR in 1/2″.
4. If allowed use wider wheels on the back.
August 8, 2015 at 7:40 am #52602
I think that my left to right weight distribution is the biggest factor, so I’m hoping that I can get some good TLC time with the scales next time I am at the track.
To Answer Freddy’s questions:
Seat is flush with the bottom of the frame, maybe 1/8th higher.
I am 5’10”
I don’t have the exact measurement but I am using 2 1/2″ spacers and I have very short hubs up front.
Air pressure is typically 13 or 14 psi. Tires are Vega Blues (spec. so no changing tires)
I have 1 seat strut on both sides.
I tried adding a front torsion bar and it did not make a difference. I do not believe there is a mount point for a rear torsion bar.
The kart is a 2012 Intrepid F4K chassis.
I think playing with seat position and weight distribution is going to be a must to solve this issue. I’ve raised the rear axel to lower the frame and the issue persists. Don’t have and don’t think I can use wider wheels. Might try the rear end asymmetry and see what that does.
August 8, 2015 at 9:05 am #52606
Doubtful the scaling is going to make much difference unless the seat is very centered (which is almost impossible given a 206. A bigger driver on vega blues is at a big disadvantage and 2 wheeling is the common issue. You may be able to move the seat to the left slightly to help with the problem but it’s likely you already have 50% or more distribution on the left side.
I would also try removing the seat stays.
Lowering the seat is easily the biggest change you can make to fix your problem aside from widening the rear track (which you can’t). If the seat lip is more than 8 1/4″ from the top of the axle then that needs to be your first priority to tip it back along with lowering it below the frame. As a bigger driver I have dealt with the issues for a long time.
August 8, 2015 at 9:21 am #52607
What effect would removing the seat struts accomplish. I had another driver recommend that perhaps adding a second one of the left side would help prevent the jacking effect, however that is contradictory to what you say. I’m going to woork on the seat position and move it as far left as I can without bending anything. I’ll try removing the struts and see if that helps.
August 8, 2015 at 12:43 pm #52611
Removing your seat strut won’t be good, it will hop like crazy and get more 2 wheeling.
Move your seat 2 inches forward, keep the back seat lip to axle close to 9″ or 9.5, It was also suggested to move seat to the left a bit, and that’s true, but only make a few adjustments 1st, don’t make too many adjustments at once.
I would totally move the seat forward and add another seat strut. You’re on the right direction buddy.
August 8, 2015 at 9:10 pm #52624
The extra struts plant the tires harder from weight transfer through the seat. Whoever told you different is wrong. Numerous karts in low hp settings do not run seat stays or remove them as grip levels increase at national events from increased rubber on the track. My statements are not opinions or things I was told by someone. I’m not fast by accident and neither are the people that have me work for them at national events. Im here to help not spend time debating. I can promise you if you follow all the steps I mentioned your problem will get solved. Plain and simple.
August 9, 2015 at 7:54 am #52628
Listen to Gary.
Rapid Racing Inc.
Vintage B-Stock Pilot
"When in doubt Gas it, It won't help but it ends the suspense."
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