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Old 07-08-2005, 07:46 AM   #1
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Default Rubber tires vs. Foams

How much faster are foams on carpet? (assuming both cars are properly setup and driven)
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Old 07-08-2005, 07:50 AM   #2
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At the tracks I run at, the stock foam cars usally are a lap or a lap and a half faster than the stock rubber cars in 5 mins. Thats on carpet.
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Old 07-08-2005, 08:06 AM   #3
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That about right and alway will be due to the grip and low weight of the tyres. Rubber demands more skill in setting up the car and driving the car as you have 25% less grip than foam and the fact that the tyre is allowed to slip and deform due to the air gap in bettween the tyre and foam insert. That being said run what your club runs.
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Old 07-08-2005, 09:13 AM   #4
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I'm a foam tire noob. Since it's universally agreed you can't run 28mm foams out of the box, what is the best diameter to start with? (and what size are they new?)
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Old 07-08-2005, 09:37 AM   #5
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Quote:
Rubber demands more skill in setting up the car and driving the car
ahhhhh....let the debate begin.






again :P
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Old 07-08-2005, 10:06 AM   #6
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Quote:
Originally Posted by Smoking motor..
Rubber demands more skill in setting up the car and driving the car...
Ah and it shall begin...

The LEVEL of difficulty is the same. The difference in difficulty applies to the goals you are trying to accomplish with your setup with the differences in grip given by rubber and foam. On one hand it is more difficult to find good balanced grip using rubbers (oversteer on corner entry and understeer on corner exit), due to the need to induce a lot of weight transfer effectively. But on the other it is more difficult to properly use the high amount of grip given by foams (traction rolling and such), due to the need to reduce weight transfer. A lot more can be said, but I'll leave that for the rest...
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Old 07-08-2005, 10:18 AM   #7
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Quote:
Originally Posted by Slow4dr
I'm a foam tire noob. Since it's universally agreed you can't run 28mm foams out of the box, what is the best diameter to start with? (and what size are they new?)
Most tires out of the box come between 62 and 66mm. For a local club race will most of the time start the tires out at 59 and let them wear down. My car is the best when the tires around 56.5. Hope that helps
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Old 07-08-2005, 10:46 AM   #8
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Yeah usually they start pretty big. I true mine down to 59ish and they last a good while. Generally if I run jaco I'll true them down to 60 to start since the wheel itself has a bigger diameter.

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Old 07-08-2005, 11:43 AM   #9
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I have to make my foams last so I start then about 62

Rubber is a totally different game than foam. Rubber tires deform and loose traction after heat cycles. They will never be the same run to run which makes setup work a real pain unless you put a new set of rubbers on every 3 runs. There are guys who do this. I feel foam is more fun because it costs much less (to go faster) and as long as you keep up with the setup work the car will handle the same run to run
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Old 07-08-2005, 01:17 PM   #10
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Good stuff. Thanks guys. (makes you wonder why they don't offer foams at ~60 right out of the box)
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Old 07-08-2005, 03:03 PM   #11
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Here was go again!!!
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Old 07-08-2005, 03:22 PM   #12
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i think the foam of choice by many racers is cyan and magenta. for club racing i start mine at 58.5mm but if im at a big race i will start them at 56.5mm. the hard part of running foams is getting a good setup to work off of. most of the problems is that you can have a setup that feels good but actually be slow because your scrubbing too much speed in the corners or the rear end isnt rotating enough. hope this helps.
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Old 07-08-2005, 03:35 PM   #13
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oh no...
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Old 07-08-2005, 03:39 PM   #14
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what foams would u say for the uk i run on tarmack, dnt realy no the temp of it but would say it is up to bout 40degre?? i think lol, but i have used orions and they dint last long at all but i liked the feel of them.thnaks bob
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Old 07-08-2005, 03:49 PM   #15
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Quote:
Originally Posted by bob33
what foams would u say for the uk i run on tarmack, dnt realy no the temp of it but would say it is up to bout 40degre?? i think lol, but i have used orions and they dint last long at all but i liked the feel of them.thnaks bob
what track do you run at? is it bedworth?

most of us..if not all of us other here in the UK run rubber on tarmac...anyway,s ince tarmac is more abrasive than carpet, i'd say go for something like 40 shore, thats what ir un on the ntc3.
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