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Post by 2ndplace on Mar 18, 2010 14:47:59 GMT -6
Hello All! Every year my son wins his division, but has always came in second overall for the third year in a row. This years car only lost by a hair each time. He would have a small lead but the other car would close in near the finish line and win. This weekend we have district races and I have removed the weight from the car and was going to place it elsewhere. I've read the posts about COM. Is that waht I need to do? Pictures below are of the car and where the weight was placed for the first races. Of course the tungsten dome has to stay in the same place, but should I move the cubes forward? Any help or input accepted, god or bad. Thanks!    |
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Art Racing
Pine Head
Life's a hole dig it!
Posts: 57
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Post by Art Racing on Mar 18, 2010 20:36:45 GMT -6
YOUR WEIGHT LOOKS OK IT MAYBE AN ALIGNMENT ISSUE.DID YOUR CAR WIGGLE ANY? IF IT DID ONE WIGGLE COULD BE THE DIFFERENCE IN A RACE THAT CLOSE.WHAT IS YOUR COM? IF IT IS TO AGGRESSIVE AND YOUR CAR WIGGLED THEN I MAY MOVE SOME WEIGHT UP.IF YOU DID NOT WIGGLE AND DO NOT HAVE A TRACK TO TEST ON THEN I DO NOT KNOW IF I WOULD MOVE THE WEIGHT TO MUCH.3/4 TO 7/8 IS A GOOD COM YOU COULD GO LESS ON A SHORTER TRACK BUT FOR A 40+FOOT TRACK I STAY AROUND 3/4 TO 7/8!IF YOUR AXLES AND WHEEL PREP ARE GOOD AND YOUR COM IS AROUND 3/4 TO 7/8 THEN IT IS MOST LIKELY YOUR ALIGNMENT.HOPE THIS HELPS.
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Post by rpcarpe on Mar 19, 2010 11:05:08 GMT -6
- Check COM, maybe place those last little bits further back. Anything under 3/4" in front of rear axles can be risky.
- Check alignment. Use an inclined board to check for straightness.
- Have you considered Rail Riding?
Good Luck!
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Post by 2ndplace on Mar 21, 2010 7:30:06 GMT -6
Update:
Well we moved the weight for the districts and ended up finishing 3rd in his group and 6th overall. So back to the drawing board. I think we are definately going to do a rail rider next year. It will be my 10 year olds last year and my 6 year olds first year offically.
I think we will start working now for next year and maybe get the car massaged and ready by next season.
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Post by rpcarpe on Mar 22, 2010 6:12:59 GMT -6
It sounds like you've done well, but would like to do better.
If you'll be running on center guided tracks again next year, I'd spring for the rail rider tool & axle press. Read up on how to use it, and try it long before the races. If you do it well, there are significant benefits.
But remember that with a new speed tip, you can cause more problems than you solve. So try it on a couple of 'testers'. Good Luck!
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tkp
Pine Head
Posts: 65
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Post by tkp on Mar 23, 2010 15:45:34 GMT -6
Curious- how much weight did you add to your car?
We have learned that in order to be very competitive we have to add at least 3.5 to 3.75 oz of tungsten. This is with the new standard 2.6 g wheel. A little more weight is added there with epoxy, body filler etc. So at the end of the day it is more like 3.6-3.8 oz.
Seems 3.75oz with 3/4 COM and RR should help you get that extra couple inches.
Lastly, might consider canting 2.5 and 1.5 front.
But if adding more weight then previous years and working with COM is a bit new for next year, then only add RR as too many new things or changes as previously mentioned, may negatively impact perfection on the other fronts. You may want to hold off on canting for next year.
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Post by teamfreeroller on Mar 28, 2010 19:55:09 GMT -6
you are right place. to learn how to build fast cars.post alot of ? on here and you will be amazed in how much speed you can gain.GOOD LUCK keep posting ? NEVER give up. PS .RR is by far the hot ticket for now
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