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Author Topic:   Tubes vs No Tubes???
J3
Dirt Maniac

Total posts: 188
posted July 28, 2005 03:46 PM  
Got a question about air pressure. I know if pressure gets to low tire will roll off of rim. Which can you run lower pressure with? Running tubes or running Tubeless? and why?

WesternAuto17
Dirt Forum Champ
Total posts: 569
posted July 29, 2005 12:17 PM  
This is a big debate, but here's what I do: LF-10, LR-12, RR(beadlock)-13 and RF-14. I run tubes on all four wheels and haven't had one roll off yet. I run a fairly large, fast 1/4 mile. I have been known to drop down below those, but not too often.

A lot of poeple on here will tell you to run 20-35 psi. I guess that works at their ractracks, but at mine, running those kinds of pressures would be like running basketballs instead of tires.

0LT
Dirt Full Roller

Total posts: 38
posted July 29, 2005 02:16 PM  
I think it depends alot on the type of wheel you are using. If you use stock (as in what came on the car from the factory) wheels you should definetely use tubes as the bead is not very big on the these tires. Use a liberal amount of baby powder in the tire so the tube doesn't move when the tire tries to "spin" on the wheel. Pulling the valvestem off the tube is the biggest downfall of using tubes.
If you use a racing wheel such as AERO's 7" D.O.T. approved wheel you don't have to use tubes unless you want to run insanely low tire pressures. These wheels (including Bassett, Bart, etc) all have a much taller bead, usually twice the hieght, of a "stock" wheel.
If your rules read the wheels must remain "stock", tell your tech inspector that ANY D.O.T. approved wheel is designed for "stock replacement use", and any of the above mentioned racing wheels should be 100% legal.
In my personal experience tubes create friction, which creates heat, which raises the pressure in the tire. You have the choice to start out real low on pressure and hope that it heats ups the tire and gains the need amount of pressure before the fast guys are gone, OR you start out fast and fade at the end of the race because your pressures have risen past optimum handling.
I now use 100% nitrogen, even in a street stock, to fill my tires. I have personally found it to remain consistent, and have seen pressures grow only 2lbs over static settings no matter what abuse I put into the tire.
-0LT

racer17j
Dirt Forum Champ
Total posts: 5390
posted July 29, 2005 09:47 PM  
i got into a pizzing contest (yeah i know i mis spelled it) about this very thing on here about 2 years ago. it seemed i was a total idiot for running tubes, but the only thing anyone could prove was that they build up more heat. is this nescesarily a bad thing? i dont think so. try anything and everything (keeping safety in mind) and find out what works for you. you can be 100% honest with your competitors and not hide anything and some of em will swear your lying!

merlinmech2
Dirt Maniac

Total posts: 131
posted July 30, 2005 06:00 AM  
Tried tubes years ago, had nothing but problems. We run imca 7" dot tires. If we get below about 29lbs on right side will roll tire off the rim. Had someone vidio the car in the corners with 14lbs in the left side and found was running half on the sidewall. There's no tread there. Had to get up to about 24psi to stop that. Just have to play around with them til you find out what works for you at your track.

J3
Dirt Maniac

Total posts: 188
posted July 30, 2005 11:10 AM  
I run Hoosier A40's on 8 inch Aero wheels. i have run them with and without tubes and haven't really noticed a differance. I run around 10-12 pounds in left and 16-18 pounds in right side. My original question still stands. Can you run lower pressure in tubes or tubeless tires with out them rolling off rims?

racer17j
Dirt Forum Champ
Total posts: 5390
posted July 30, 2005 07:12 PM  
as to tubes vs no tubes/ we have won two features this year with rims bent back and the tube exposed. scary but true. My highest pressure on hoozier dirt bozz tires is 15 rf and lowest 8 lf. yes when I come in the right side presure is up 3 to 4 lbs and left is up 2 lbs but thats true in all forms of racing, friction builds heat. So I cked my competitions tires theyre up 2 to 3 lbs w/o tubes. I do run ag tubes simply because theyre thicker and dont shift as much also I like the stem config. Heres the rub as I can see it. If I can start out lower pressure than you and finish just slightly higher and have more chances of winning when tires get bumped rubbed and slightly debeaded then I'll go with tubes.

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Light it up, Baby!

Eljojo
Dirt Forum Champ
Total posts: 968
posted July 31, 2005 10:19 AM  
I had problems with them pulling the stems out of the tube. Unless I ran them on the left side of the car.

sideways
Dirt Forum Champ
Total posts: 715
posted July 31, 2005 08:20 PM  
The only trouble I've had with tubes is when they finally wore a hole through them or wheel bead not tight enuff and turn the rim in the tire.

    

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