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Using a truck scale to weigh a race car.

9.4K views 23 replies 17 participants last post by  joe cool  
#1 ·
I know, not the right way to do it. However, I have several friends who have weighed them that way. The more clever ones weight the truck, trailer, and car then weight just the truck and trailer. I figure that is a better plan, since it gets the weight up to a place the scale is more likely to be accurate.

Anyhow, a couple of these friends have told me what their cars weigh doing it this way, and I just can't believe the numbers. One is a full sized Chevy pickup truck. Small block and glide. Factory truck rear. All steel, except for the hood. Stock interior, except for the replacement of the bench seat with a couple of light weight buckets. He says it weighs 3800 pounds. That seems really low to me. Another friend has a Fox body Mustang with an iron block LS swap (no turbo). It has had some lightening. Door inner supports removed, etc. But no aftermarket fiberglass or plastic panels. He says that thing only weighs 2600 pounds. That seems really low to me, as well. I know those cars aren't heavyweights, but only 2600 pounds seems really impressive, if it's true.

The last time my own 67 Camaro was on scales was at a race track in the 1970's. :) It has gone through a few subtle changes since, but it weighed 3,400 pounds back then! Take care. Tom Worthington
 
#2 ·
The best way to weigh a race car on truck scales is to weigh the truck, trailer with car loaded, then unload the car and re-weigh - or vice-versa. Remember however that the truck scales might not be as accurate as the sales at your local race track.
 
#4 ·
The ones Ive seen divide weight between axles, there it is actually several smaller scales. My advice on weighing just a car, is to park the whole thing on one block. In this pic it totaled my car at 3120 and I had counted about 300ish pounds of weight reduction I had done. Seems on par deducted from a stock weight car, so I believe they are pretty accurate.

 
#15 · (Edited)
They show you how to weigh a 2 axle vehicle at CAT's website, FYI. They recommend steer axle on platform 1 and drive axle on platform 2. Considering they're made to weigh 2 axle vehicles, there's really no reason why they shouldn't be accurate, no matter whether you weigh 2600 lbs or 26,000.

Even when weighing a passenger vehicle with trailer, they recommend the same, with the trailer by itself on platform 3.

https://catscale.com/how-to-weigh/
 
#23 ·
For total weight, I use the scales at the local recycling center. Since I have an account there, they never charge.

I don't know the overall accuracy of the scale, but they are pretty damn close if I step on or off.

We have scales at work as well, for the truck terminal. I could probably use them if I asked, but dealing with the guards isn't worth the trouble.