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Discussion Starter · #1 ·
Does anyone use weight percentages in R/C oval racing to set up there cars? I notice alot of talk about left rear weight but never hear anything about left side weight, rear weight or diagonal ( wedge ) Just curious, been racing over twenty years ( dirt latemodels, IMCA modifieds and Karts with my son whose now in the Air Force ) but just got into R/C a couple years ago.

Later, Lee :cool:
 

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Fl Flash we normally keep it vary simple, by just talking left rear weight. It is really only used as a starting point, since every one has diferent driving and other car setups. besides the people that would gain from the rest of the info already know it. so most of the time you will only hear left rear weight.
 

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I use four corner scales and usually calculate it out as percentages if the total car weight has changed - otherwise if the car is the same, I just look at weight across the front tires as a quick check. Percentages are also useful if comaring cars of different total weights. Like you, I got used to using four scales on a full size race car - One scale on the left rear makes no sense to me.
 

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FLASH i know it all doesn't make sense, but what part of racing does?.lol.. i also am use to looking at percentages, cross weight, left side, and right side. these guys are all correct. i don't think u'll find a single car at any event that uses the same set-up. another thing is i just think a new scale was released that is like the real deal. i don't know where i seen it though. this hobby it is three times cheaper just to build your own scales out of everyday items. i use a 3/4'' block of plastic, 4 decent mail scales, a screw on each corner, with a leveling bubble in the center. granted u only get what weight u have on each individual wheel, but it's better than nothing. so there is umm i think 150 dollars compared to the price of the big boy scales. i can't remember how much my longacre scales were..lol... so more or less at least u get the idea of what split u have to front, or rear, and cross weight. so ithink a conculater is the next step..lol... :lol:
 

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Go to schoenfeldheaders.com the have a weight program that does it all for you just put in the weights. But this is online only.

Ben Giles
 

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I used a scrap piece of Corian (from a sink cut-out) for the platform to put the scales on. You can drill it and tap it on the corners and put threaded adjustable feet to get it leveled out. I think I got the Corian piece for $20, and add a couple of bucks for the feet. It's nice and solid and won't warp with humidity like wood can.
 

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Total=LF+RF+LR+RR
F%=(LF+RF)/Total
LS%=(LF+LR)/Total
Cross Weight%=(LR+RF)/Total

Remember LS% and F% can only be changed though moving the CG of the car, by shifting ballast in the car. Cross weight is a function of the jacking of you individual corner springs (we typically use our side shocks).

S & B
 

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Discussion Starter · #9 ·
I was curious because I recently built a four scale board ( been using a friends LR only scale board ) out of scrape lexan,digital postal scales and some hardware from Home Depot, about $125 invested. I was completely STUNNED :eek: when I saw the %s on my very good handleing car! 45% front,59% left side and 51% crossweight! This is a L40 running caps on a 310 ft runline concrete oval with 12 degree banking in a four corners,flat back straight and 5 degree banking on the front mild dogleg. Like I said this car handles great! and stays consistent throughout a run. The left side seems ok to me and the crossweight is about what I expected but 55 % on the rear seems awfully high to me? Seems to me it should be pushing like a Dump Truck :lol: Any opinions are welcomed!

Later, Lee Helander :cool:
 
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