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Lap times vs. weight of car

Lap times vs. weight of car

Old 07-17-2007, 10:58 PM
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As much as you can without being below the weight limit. Better ways to gain .1 sec in lap times would be practice and changing your car setup.
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Old 07-18-2007, 06:56 AM
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You can reduce the rotational mass but at the expense of durability. In full scale, it is commonly said that for every 1 lb of rotational mass (unsprung mass) reduced is like 10 lbs of static mass (sprung mass) reduced in the rest of the car.
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Old 07-18-2007, 06:27 PM
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Way back in the day, with pan cars on oval, I would build the car very light, then add weight to get to the min at tracks that would weigh the cars during tech inspection. I'd remove the weight for tracks that didn't tech, and it was way faster without all the weight.

On those light cars, and on the smallish tracks I was running on, I'd guess that 2 ounces would be an easy tenth. Might have been closer to 1 ounce per tenth. My superlight stock motored car could run with the mod cars on the smaller tracks. With the weight added, the mod cars could run away. And the diffence wasn't as big on bigger tracks.

Of course, things are a bit different with a TC on a road course compared to a pan car on a oval. But that's my experience.
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Old 07-18-2007, 07:25 PM
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Originally Posted by Tek Nickal View Post
"An object at rest will stay at rest, and an object in motion will stay in motion at constant velocity, unless acted upon by an unbalanced force."

Well the unbalanced force here is gravity, and a heavier car will be more affected by gravity. I'm no scientist but it seems like a lighter car would be better.
Heres something to chew on.

Right now, this very second. While you car sits on your table or in a box, or in the garage....whatever as long as it "isn't moving anywhere" in reality IS moving approximately 1000 miles per hour. So is my laptop. and so is your computer screen. LOL

Yeah, lighter is generally going to be better to the point where there is so little weight on each tire that there is no friction between the rubber and the racing surface. Then a lemans body would be awesome!
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Old 07-18-2007, 07:41 PM
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Yeah, lighter is generally going to be better to the point where there is so little weight on each tire that there is no friction between the rubber and the racing surface.
Yeah, but then it would have so little inertia that it wouldn't take much friction to make it change direction.
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Old 07-18-2007, 07:45 PM
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Originally Posted by Turbo Joe View Post
Yeah, but then it would have so little inertia that it wouldn't take much friction to make it change direction.
You got me on that one! haha
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Old 07-20-2007, 02:16 PM
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We ran a points series of Front Wheel Drive cars, with silver can motors a few years back. It was based on the BTCC and JTCC. The winners added weight, and the loosers removed weight. We all started with a minimum weight, then added 10 oz to first, 8 oz to 2nd, and so on, till 10th removed 10 oz. The amazing thing we found was that the cars would be faster with more weight to a certain point. The winners had over 3 lbs of lead attatched on the car to help equalize the field. One thing I will say is that a heavier car hitting a lighter car, the lighter car will loose. Even if the lighter car hit the heavier car, the lighter car just bounced away. I guess this confirms the term "throwing your weight around". We did this two times, and the results were the same both times. It still came down to the better drivers winning, and the less experienced drivers even without the weight penalty loosing.
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Old 07-21-2007, 12:51 AM
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Originally Posted by dsrbltoys View Post
.....and the less experienced drivers even without the weight penalty loosing.
This is the key point!! Nothing can beat experience

For most people level weight doens't make any difference, while on pro level it can but again the better prepared driver will win.
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