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Post by pceng on Jun 27, 2011 8:45:34 GMT -7
Hey guys - The upcoming race at Lions, is going to be my first proxy race and first trying to conform to NTRA rules. Entering the race was easy and building the cars no problem. Wish I had more time for tunning cars. Every available moment this past month has been spent sanding tires. Maybe someone could come up with a list of tire and wheel combos that work for the different NTRA classes. I know that I'm one newbie to the NTRA that would be very thankfull for such a list.
................thanks in advance, PC
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Post by eddiebee on Jun 28, 2011 19:17:57 GMT -7
Hi PC , and welcome. This is my 3rd season of racing with these folks. I can tell you this is a great bunch of racers. Very helpful and the rules are very easy to follow. As for a tire and wheel combo. I'm not sure if there really is any choice that works better than others. As long as the sizes match the rules , anything should work. In the last event , I got 2 runner-up finishes out of 4 classes. And I just follow the rules. Hope I gave you a little help.
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Post by TGM2054 on Jun 28, 2011 20:15:23 GMT -7
I could tell ya.... But then I'd have to shoot ya! ;D Actually I couldn't tell you for sure what size tires I used. I spent probably about $50 on tire and wheels trying to come up with the right combination of height and width. I can tell you that my N/PS have AJ's .275 single flanged wheels and Gel Claw tires (what they're supposed to fit I don't know) both are narrowed to be with in the rules and according to my calipers are under height. On my N/FC both cars are different. One has BSRT .290 double flanged wheels with under sized tires and the other has AJ's .275 single flanged wheels with undersized tires. Both of those sets of tires are silicones but as to who made them I don't know. I did learn one thing, silicone tires will only strech so far for, for so long, and then BLAM! They split! I had just put the tires on one of the funny cars chassis, set it on the track, and set the body on to see how it looked, The tire let go, and blew the body completely off and on to the floor. Not what you want to have happen a week and a half before a race and you don't have another set and you have to pretty much mail order all your stuff. ( It was kinda cool though when it happened)  Have fun and good luck this weekend. |
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Post by pceng on Jun 29, 2011 8:03:19 GMT -7
Thanks for the response guys - What both of you hit on is what I was hopping to avoid any more of. The hit or miss kinda thing. Guess I spent about $50-60 on tires and wheels trying to come close to spec's. And no such luck, the only way I came close was to sand down oversized tires. From what I've seen on posts here max. tire size gives you more top end. Maybe this is just opinions I remember seeing, but does make sense.
Perhaps this is one for the "Ninja" and the quarterly. I don't remember who, but remember reading that sili-foams were omitted to keep costs down. Yet it has become clear to me that buying one set of sized tires and wheels would be alot more cost and time effective than experimenting. Not to mention getting something round to begin with.
"TGM" mentioned stretching tires. I started doing this years ago when peeling on sili-foams made them unpredictable. And think that the quality of the tire compound has alot to do with how long they last. I've also at times found new tires with what apears to be cuts in them( not visible unless tire is squeezed and rolled ). Alot of tires have split or blown up on me. But the wierd thing is the first two sets I ever did are still together, and on Wizzard .360 hubs!
Well hope this could be coverd in quarterly, sounds like it could help everyone.
...................PC
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Post by nosubfor3 on Jun 29, 2011 14:12:24 GMT -7
Thanks for the response guys - What both of you hit on is what I was hopping to avoid any more of. The hit or miss kinda thing. Guess I spent about $50-60 on tires and wheels trying to come close to spec's. And no such luck, the only way I came close was to sand down over sized tires. From what I've seen on posts here max. tire size gives you more top end. Maybe this is just opinions I remember seeing, but does make sense. Perhaps this is one for the "Ninja" and the quarterly. I don't remember who, but remember reading that sili-foams were omitted to keep costs down. Yet it has become clear to me that buying one set of sized tires and wheels would be alot more cost and time effective than experimenting. Not to mention getting something round to begin with. "TGM" mentioned stretching tires. I started doing this years ago when peeling on sili-foams made them unpredictable. And think that the quality of the tire compound has alot to do with how long they last. I've also at times found new tires with what appears to be cuts in them( not visible unless tire is squeezed and rolled ). Alot of tires have split or blown up on me. But the weird thing is the first two sets I ever did are still together, and on Wizzard .360 hubs! Well hope this could be coverd in quarterly, sounds like it could help everyone. ...................PC PC Jag hobby sells these tires under the silicone tires heading on his web page. These are what I use for my 4 gear cars. They are delicate and do tear easy. But if you apply even force with your fingers they slip on the 4 gear rim and fit tight. The mounted diameter is within the rules.They are meant for the standard AFX wheel. AFX Drag Black Silicone Tires (pr) S301 $1.75 |
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Post by TGM2054 on Jun 29, 2011 15:44:10 GMT -7
In defence of the no silly foams rule, I did out fit four carsand I have extra tire left over. If I had used silly's I would have gotten the same four cars done but the wouldn't have been and experimenting with the sizes to see what worked, what fit and what didn't. Alot of guys gave up what worked on their cars, the problem I had there was, they were sold out when i went to buy them so I had to experiment. Maybe after the race some of us can come up with a chart or something that will give an idea of what size tire and wheel combos will come out to. One other thing, a big tire isn't always the best to use. I try to run the narrowest smallest tire I can. I want the car to top out at the lights not before,or after. That and it takes less power to get a smaller tire rolling. I use this theory on my 1:1 drag car. I run a 9" slick and pull mid to low 6's in the 1/8 in a 3400lb car with "street legal slicks". (Anybody can go fast on big tires. It takes talent to do it on little ones!)
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Post by nosubfor3 on Jun 29, 2011 17:05:22 GMT -7
In defence of the no silly foams rule, I did out fit four carsand I have extra tire left over. If I had used silly's I would have gotten the same four cars done but the wouldn't have been and experimenting with the sizes to see what worked, what fit and what didn't. Alot of guys gave up what worked on their cars, the problem I had there was, they were sold out when i went to buy them so I had to experiment. Maybe after the race some of us can come up with a chart or something that will give an idea of what size tire and wheel combos will come out to. One other thing, a big tire isn't always the best to use. I try to run the narrowest smallest tire I can. I want the car to top out at the lights not before,or after. That and it takes less power to get a smaller tire rolling. I use this theory on my 1:1 drag car. I run a 9" slick and pull mid to low 6's in the 1/8 in a 3400lb car with "street legal slicks". (Anybody can go fast on big tires. It takes talent to do it on little ones!) Go to www.hoslotcarracing.com/Read the tire and wheels section. This should help. |
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Post by pceng on Jun 30, 2011 7:12:44 GMT -7
Thanks for the imput guys. I think the S301's are what I used on N/FC cars, AF/X hubs, I'll have to give the others a try. Checked the chart on hoslotcarracing, kinda what I was thinking would help if it could be broken down into NTRA classes. Sanding tires did get me thinking about what size tire would be best for individual cars. Was a major torque difference between N/PS cars. Guess tire size is like an extension of your gearing. .............PC
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Post by TGM2054 on Jun 30, 2011 14:58:50 GMT -7
Tire size directly effects your gearing. Take a car and try two different height tires, same width. The shorter the tire, the quicker out of the hole it sould be, with the taller tire it will be faster at the top end. The higher the torque, the taller a tire you should be able to run. Here's one more thing to consider, wider isn't always better. A wider tire spreads the weight out over a larger area making it easier for the tire to lose traction. This is only my second race and I'm learning fast that the same ideas apply to these cars as to my 1/1 car,just with a different way to approach it.
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Post by Joe65SkylarkGS on Jun 30, 2011 16:24:29 GMT -7
This is my first too. I just hope to be competetive  |
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Have fun and good luck this weekend.
