Tony kart evrr setups (over stuck)

[Tom Ricketts]

I have a 2011 tony kart evrr and I have a tillet t8 seat because im not a huge fan of the otk or tillet t11 or t12 seats that lay back I like to sit up more when I drive.I run at 360lbs with a kpv-3 engine The problem is the kart gets really overstuck in the middle of the day. I have tried widening the rear track, loosening seat struts, adding and removing castor, dropping air pressures, loosening the front torsion bar
and nothing really frees the kart up enough and it keeps hopping in the corners. Does anyone have this kart and run a t8 seat? what kind of setup are you running? should I go harder or softer axle? I have heard a few people say to cut slits in the seat to make it flex more will that work?
Any help would be greatly appreciated.

Thanks
Tom

[Peter Zambos]

A few questions:
Have you scaled the kart? Have you tried simply moving the seat forward a little? Where is the bottom of the seat in relation to the bottom of the frame rails?
You shouldn't have to cut your seat to make this chassis work.

[Brian Degulis]

I would also prefer a more up right seat so I set 2 diffrent karts up that way and both of them hooped on the hair pin and didn't handle well in general. I think it just puts to much of your upper body weight to high.




Brian

[TJ Koyen]

My first thing I like to do to cure a hop is to dial a little more negative camber in. A hop comes usually from over-jacking weight in the corner and overloading the outside tire.

If you've tried everything and the problem continues, your seat is probably in the wrong place/your weight distribution is off.

As Peter asked, have you scaled the kart?
_________________
T.J. Koyen
OKTANE VISUAL - Custom Helmet Paint & Graphic Design
www.oktanevisual.com
www.facebook.com/oktanevisual
--------------------------
DB Motorsports
Exprit/Leopard

[Tom Ricketts]

Peter,

I have not scaled the kart yet and the seat is pretty close to the gas tank it's at 24" from the backside of the front frame rail to the wing on the front of the seat. I have a 10lb weight mounted under the front of the seat and a 5 lb weight under each side at the front. For a total of 20 lbs of lead. The seat is level with bottom frame rails and about a 1/4 " below the frame rails.


Tj,

I will try to add a little negative camber and see what happens. Should I try a softer axle if that doesn't work?

Thanks for the help guys I just want to really get the kart to work with the t8 if possible.

[TJ Koyen]

Hard to say on the axle. Sometimes the hop comes from being too soft, sometimes from being too stiff.

A quick change would be to loosen/tighten the 3rd bearing on the axle. Then you can get a good idea which direction to go. If loosening it helps, go to a softer axle as the next step. If tightening helps, go to a stiffer axle.
_________________
T.J. Koyen
OKTANE VISUAL - Custom Helmet Paint & Graphic Design
www.oktanevisual.com
www.facebook.com/oktanevisual
--------------------------
DB Motorsports
Exprit/Leopard

[Peter Zambos]

Seat location has so much to do with the performance of a chassis, though you've probably already been told that a million times. From your description, it sounds like you have the seat vertically in the right position. Having a greater upright posture is fine, but that change has to be accounted for. Lowering the seat helps with that, and having it 0.25" below the rails is about as low as I'd be comfortable going. Going any lower, you'd probably notice that your posterior getting a little hot. So, you should be good there.

Since you're not sure where you are in your baseline weight distribution, it's hard to say if you're off in that aspect. My gut tells me that the rear is a little too heavy, but if you're just off the tank already, moving the seat forward might just be out the window, though it's usually where you start. What you could use to help with weight distribution is ride height. If possible, I would definitely take a day, have the kart scaled and see if different heights get you closer to the suggested OTK specs.

I would agree with TJ on the negative camber as long as you're not running a tire with a stiff side wall like a Dunlop or a Hoosier.

[Gary Lawson]

A tony kart does not need negative camber. They run positive almost all the time. I would say first to put the seat at the factory spec and go from there including the the angle. If you are a bigger guy you need to get lower. Next I would try a stiffer axle

[Gary Lawson]

A tony kart does not need negative camber. They run positive almost all the time. I would say first to put the seat at the factory spec and go from there including the the angle. If you are a bigger guy you need to get lower. Next I would try a stiffer axle

[Dan Haynes]

Not sure about the EVRR but we had a couple of Kosmic T11's and the recommended seat position was about 61cm front the front tube so it looks like that measurement is pretty close, provided the T8 is close to the factory seat. We had a T11 seat on one and it was very similar to the OTK seat. Can't remember but think the center of the lip on the rear top of the seat was supposed to be about 105cm. But again, a T8 might be different.
_________________
Blaise Haynes
#3 Arrow X1-CIK
TaG
Cook Racing Engines Parilla Leopard

[Brian Degulis]

Don't overlook the seat angle. TJ and others gave me good advice that got me handling well but not untill I went back to the standard reclined seat position. To straight puts to much of your body weight to high above the ground and it throws everything off. It's also tough on your ribs the more straight up you are the more your upper body weight is leveraging your ribs against the seat. Add a little bounce and ouch makes you start thinking about golf. Well maybe not but it does hurt.


Brian

[Tom Ricketts]

Dan,

I think I am very close to otk seat specs but from what I have heard the t8 seat is far to stiff and not close to the otk seat at all, Which is kind of a bummer because it is such a comfortable seat and position. The comparable tillet seat is the t-11 or t-12 but they all have that layed back style similar to the otk seat. I might have to just deal with the layed back seating position. Im going to try a few drastic changes such as a few axle changes and moving the seat around a bit. The last thing I might try is cutting the lips of the t8 seat to get it to flex more. I had a friend with me at the track today and he has a kosmic with the t8 seat and his was doing the same thing, so we are both in the same situation.


Brian,

What seat do you have in your kart.

[Peter Zambos]

[Jim McMahon]

How many turns is this happening on? Where in the turns is it happening?
Have you tried changing your line or throttle application? Could it be initiated by a bump or crack in the surface that you could avoid?

You should be at max rear width practically all the time. Tune your turn in with front geometry and track width, tune from the apex out with hubs and rear axle stiffness. There is crossover between the two of course but don't get too hung up on the nuances yet. If your seat is more upright then naturally that will affect how and when the weight shifts. Might be worth getting you kart on a scale and find the height of your center of gravity.

Stuck to me is a term I use when the kart wont pickup a wheel and is literally "stuck" to the track.

Sounds like you have tried a couple of things to soften overall, might be worth going the other way.
It does sound strange that what ou have tried so far made little difference so from that POV you are looking at possible COG location issue, namely height. There's no rule of thumb for how high it should be, all I can say is note were it is now, and try lowering it by 1/2".
_________________
Live in the midwest and have a TaG, Shifter, KPV, KT100, Animal\LO206, enduro or superkart?
Click here to join the karting festival at Blackhawk, IL June 1st-2nd.

[Jim McMahon]

COG height calc: http://www.longacreracing.com/articles/art.asp?ARTID=22
_________________
Live in the midwest and have a TaG, Shifter, KPV, KT100, Animal\LO206, enduro or superkart?
Click here to join the karting festival at Blackhawk, IL June 1st-2nd.