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Joćo Costa
Joined: 30 Nov 2010
Posts: 61
Location: Portugal, Not USA state, Porto
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 Posted: Sat Nov 10, 2012 10:55 am Post subject: |
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sorry to correct you but my chassi, jarno trulli jt3, it's a 2007 chassi with homologation until 2008
it's a 32mm chassi |
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Dan Haynes
Joined: 17 Sep 2007
Posts: 2391
Location: United States, Pennsylvania, Ellwood City
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| Posted: Sat Nov 10, 2012 12:14 pm Post subject: |
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Ryon is right about the seats. We had 2 Kosmic T11's. One had an OTK #2 seat and the other had a Tillet T11. The seats were almost identical in appearances.
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#3 Arrow X1-CIK
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Oscar Biondi
Joined: 27 Sep 2011
Posts: 226
Location: United States, California, Carmichael
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| Posted: Sat Nov 10, 2012 12:50 pm Post subject: |
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| I thought the T11t was developed specifically for Tony Karts |
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Joćo Costa
Joined: 30 Nov 2010
Posts: 61
Location: Portugal, Not USA state, Porto
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| Posted: Sat Nov 10, 2012 1:18 pm Post subject: |
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so, the seat is out of question, my seat is the "last" model from OTK.
and with that, i really need to make my own front porch or buy one |
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Joe Palmer
Joined: 19 Sep 2006
Posts: 151
Location: United States, Florida, St. Augustine
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| Posted: Sat Nov 10, 2012 2:45 pm Post subject: |
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| Ryon Beachner wrote: | | Joe Palmer wrote: | The OTK seat guide, is just that a guide. Keep in mine they may be developing their seat guide based on 5'3'' midgets. If the kart scales perfectly where you want it, but your knees are in your chest, it won't be fun to drive.
You may want to look at a different seat. Tillett makes various seat models. Tony Kart may even offer a different model seat in the same size as you require. Tony kart also offers a very well designed front porch extension. |
This is not at all true. Ardigo and Dreezen are both over 5'9 and Camponeschi is not short by any means. Although they do deal with shorter drivers such as in KF3, the seat position remains largely the same in order to obtain data that is relevant to the teams experience. For this very reason OTK offers a rudder pedal system for shorter drivers, and an extended porch kits for very tall drivers.
The tricky part is that the JT3 is not the same frame geometry as the rest of the OTK family and was last produced in 2004. Much before the current specs were established. I'll go through my old documentation on the early Kosmics and see if I can find something more accurate to his application.
Also, so everyone is aware, the OTK seat and Tillett T11 are very similar with the same back angle nd flat bottom only differing in regards to material and stiffness. I would recommend he stay with the factory seat. |
Ryan,
I was merely trying to emphasize the point, that OTK's seat placement guide, is just that, a guide. A place to start if you will. I'm 6'-1" and just to be comfortable, my seat needs to back further than their guide suggest. If the kart doesn't work at a OTK recommended placement of say 615mm, but at 630mm it's a dream, where are you going to place your seat? Every driver is going to be different. Even if they share a similar body frame. I did notice at the SuperNats the last couple of years, Ardigo & Dreezen both had their seat position way back. At least in the sessions that I took notice. This suggested that they must meet all the height requirements for the carnival.
I didn't think about the point you made regarding the same seat position for all team drivers. It is a very interesting theory. Comparing apples to apples for data acquisition? If so, is seat position a more important constant, or would weight balance be a better constant? You must be part of a very well funded team to get this type of Data????
The current OTK seat is; as you stated, darn near identical in shape to the T11. For some reason, I always have found the T11 to be much more comfortable, especially against previous versions of the factory OTK seat.
Others have made some excellent suggestions to try as well. Steering shaft length, steering shaft angle, angle steering hub, etc. At 6'-1", I was able to get a comfortable seat position without the extended from porch. When I used the extended porch, I found that my legs would end up being at too flat a position. I wasn't able to use my feet for any leverage.
For Joao (sorry I don't have the symbol for over the a), I would suggest, get the seat in a comfortable position without the extended front porch. Then go test. If you need to move the seat far enough forward that it becomes awkward or uncomfortable, then add the extented porch. Like everthing else, you're just gonna have to do the work. |
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Anthony Burke
Joined: 19 Mar 2011
Posts: 22
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| Posted: Tue Nov 13, 2012 2:06 am Post subject: |
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| Given that Tillett make the seats for OTK in the first place, it's a fair bet that the standard OTK seat is a T11 in the first place. The T11t is simply a softer version, as far as I'm aware. |
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Anthony Burke
Joined: 19 Mar 2011
Posts: 22
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| Posted: Tue Nov 13, 2012 2:06 am Post subject: |
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| Given that Tillett make the seats for OTK in the first place, it's a fair bet that the standard OTK seat is a T11 in the first place. The T11t is simply a softer version, as far as I'm aware. |
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joseph hollinger
Joined: 12 Sep 2002
Posts: 9532
Location: United States, California, san francisco
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| Posted: Tue Nov 13, 2012 10:41 am Post subject: |
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What's wrong with your seat position? It doesn't look all that bad in the picture.
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A lie gets halfway around the world before the truth has a chance to get its pants on. -- Winston Churchill. |
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Joćo Costa
Joined: 30 Nov 2010
Posts: 61
Location: Portugal, Not USA state, Porto
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| Posted: Tue Nov 13, 2012 1:13 pm Post subject: |
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| joseph hollinger wrote: | | What's wrong with your seat position? It doesn't look all that bad in the picture. |
i have my legs too close from the steering wheel and the steering wheel is too low and a little distant.
i like to drive with my arms flexed( i don't know if it's the right term) and my legs a little less flexed/bented.
And right now i can't push the seat more backward, maybe if i cut the bend on the outside i can gain one centimeter.
and i will gain more "leg space" if i tilt the seat to the front or to the rear? what i want to say is: top of the seat closer the axle or more distant? |
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Oscar Aguilera
Joined: 18 Jul 2001
Posts: 1614
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| Posted: Wed Nov 14, 2012 7:06 pm Post subject: |
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what i can see from the pic...
you might have foot stops? because you foot is angled way up? either way you can extend the pedals till they almost hit the front bumper.
and yes if you lay the seat back...closer to the axle you will have to lift the front of the seat and move the bottom closer to the front.
this will create a more natural feel in your legs...right now the seat is pointing more straight at the leg...so you feel you need more leg room and your knees are more bent because of it.
if you tilt the seat back to say 8.5 inches from the axle...you will ease the legs from pertuding so far to the front...then you will actually be able to lower them so you dont feel like you are being bent at the waist.
you actually appear to have average to short legs for your hdight and long arms? just an observation.
if you lean the seat back and not move the bottom forward you will put more weight on the rear...so you kinda have to do both....
then you may have the problem of needing that front porch after all.
so IMO
i would tilt the seat back...move the bottom just a tad forward, keep the bottom flush to the frame and push the pedals to their limit right at the bumper.
you should be able to adjust the throttle and brake to be fully depressed about 1/8th of an inch from the bumper.
just my opinion...sorry i dont have my metric tape or i would have given you cm's |
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Joćo Costa
Joined: 30 Nov 2010
Posts: 61
Location: Portugal, Not USA state, Porto
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| Posted: Thu Nov 15, 2012 2:30 am Post subject: |
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About the foot stops i really don't remember, but it's possible
But i have removed earlier before, so right now i'm running without them.
Regarding the pedals i have made that upgrade, i have extended the pedals almost they touch the front bumper when fully pressed(gap with an 1/8inch a little bit more).
i have this measurements noted on my laptop but i think the distance from the top of my seat to the axle is 21,5cm or 22...don't remember for sure.
i will shorten this to 20 or20,5 and see if i can notice any difference.
Thanks to all for the ideas you gave, next week i will manage everything and take a picture to show you guys the differences |
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Peter Zambos
Joined: 22 Jun 2006
Posts: 554
Location: United States, Illinois, near Chicago
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| Posted: Thu Nov 15, 2012 6:53 am Post subject: |
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| Anthony Burke wrote: | | Given that Tillett make the seats for OTK in the first place, it's a fair bet that the standard OTK seat is a T11 in the first place. The T11t is simply a softer version, as far as I'm aware. |
Having used both an OTK seat and a T11, this is not correct. |
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Anthony Burke
Joined: 19 Mar 2011
Posts: 22
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| Posted: Fri Nov 16, 2012 6:59 pm Post subject: |
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Hi Peter, can you elaborate?
I assumed they were the same after an email to Tillett themselves. They didn't state that to be a fact - I was just reading between the lines.
In what way/s are they different? |
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Peter Zambos
Joined: 22 Jun 2006
Posts: 554
Location: United States, Illinois, near Chicago
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| Posted: Mon Nov 19, 2012 12:28 am Post subject: |
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To be more specific the T11 that I used was not the T11t, which is the specific model that Tillett has for OTK chassis. I don't doubt that the T11t was produced for OTK, as I've exchanged a number of emails with Steve Tillett in the past, and he's always been forthright, but that doesn't mean that OTK is shipping his seat as OEM. Ultimately the shape remains the same between the standard T11 and T11t, and my T11 differed in two important ways and one not-so-important from the stock OTK seat.
First, the angle of recline was more in the T11. I no longer possess either of these seats so I can't break out an exact difference in the angle. Secondly, the shape of the lateral support in the ribs was shaped differently between the two. I can't really speak to flexibility, as I didn't have the T11t. Lastly, the not-so-important difference was that the OTK seat had a slight green tint to it.
So, essentially, if you're a taller driver, I would go the route of the T11, if you've narrowed your selection between these two specific seats. |
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