Actual weight of the 350? (anyone measure it yet?)
12-08-2002, 03:06 PM
#21
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Originally posted by fdao
What about your vehicle registration paper? Don't they put the actual weight of your car for tax purposes on there? You can check that out without going to the scale, right?
What about your vehicle registration paper? Don't they put the actual weight of your car for tax purposes on there? You can check that out without going to the scale, right?
Your registration usually just uses the manufacturer's listed weight, which isn't completly accurate. My Audi's listed weight is 3300 pounds, and with a full tank of gas it's actually over 3400 on the scales.
12-09-2002, 05:33 AM
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I had forgotten about this thread until I came upon it today. I am going to try to explain how to weight your car with 4 bathroom scales, four 2"x10"x10?' planks and four concrete patio stones. The theory behind this is if each wheel of the car is sitting onto top of a scale then you are reading the actual weight of the car. Since the car weighs more than the scales can handle you need to move a percentage of the weight off the scales. This is where the four boards on blocks come in.
100%-------- 50%--------0%
++++++++++++++++++++++ < 10' long plank
==== ------------------ [==]
^scale ------------------ ^ patio stone
This is just a simple lever device. All you want to do is get 75% of the cars weight supported by the end where the blocks are and 25% at the scales. Read the weight at the scales and multiply by 4. This will give you the weight at that wheel. Walk around the car and read each scale and do the math. Then add up all four corrected weights and there is the total weight for you car. You must keep the planks level or the weights will be off by a percentage so the scales may need to be raised to the same height as the pation stones. The stones will be under the car in case you are wondering. I left out a lot of measurements because I am just a dumb NASCAR fan and don't know much about the real world of racing. All I know how to do is turn left a lot faster and safer.
100%-------- 50%--------0%
++++++++++++++++++++++ < 10' long plank
==== ------------------ [==]
^scale ------------------ ^ patio stone
This is just a simple lever device. All you want to do is get 75% of the cars weight supported by the end where the blocks are and 25% at the scales. Read the weight at the scales and multiply by 4. This will give you the weight at that wheel. Walk around the car and read each scale and do the math. Then add up all four corrected weights and there is the total weight for you car. You must keep the planks level or the weights will be off by a percentage so the scales may need to be raised to the same height as the pation stones. The stones will be under the car in case you are wondering. I left out a lot of measurements because I am just a dumb NASCAR fan and don't know much about the real world of racing. All I know how to do is turn left a lot faster and safer.
Last edited by Thunderbolt; 12-09-2002 at 05:42 AM.
03-31-2003, 10:46 AM
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we weighed an Enthusiast 350Z of a nationally known autocrosser this past weekend at the SCCA SEDiv Solo2 event. With muffler, spare tire, and tools removed, 1/2 tank fuel, and Hoosier tires on the OE wheels it weighed 3077# on the local region's corner weight scales. With the addition of lightweight wheels and dropping the fuel tank down to several gallons it will come in around 3010# in max SCCA B Stock class autox trim.
03-31-2003, 06:12 PM
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Originally posted by VaGentleman
How about this to weigh your car?
Measure the foot print of each tire (put a piece of paper next to each of the four sides (actually only need two sides, i.e., the front or rear and the outside or inside) of the tire and run a pencil across where the tire meets the ground).
Multiply the 2 lengths and you get the area of the footprint in square inches.
Now, take the air pressure in that tire. You will then know how many pounds are exerted by that tire per square inch.
Multiply the air pressure for the tire x the foot print area.
Do this for the other 3 tires. Add up the figures and...Ta Da...you get the weight of the car.
How about this to weigh your car?
Measure the foot print of each tire (put a piece of paper next to each of the four sides (actually only need two sides, i.e., the front or rear and the outside or inside) of the tire and run a pencil across where the tire meets the ground).
Multiply the 2 lengths and you get the area of the footprint in square inches.
Now, take the air pressure in that tire. You will then know how many pounds are exerted by that tire per square inch.
Multiply the air pressure for the tire x the foot print area.
Do this for the other 3 tires. Add up the figures and...Ta Da...you get the weight of the car.
04-01-2003, 12:19 PM
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Originally posted by polar-md
If you lower the air pressure in the tire, then more of the tire will touch the ground, thus bringing the wieght back "up" when you do your calculations.
If you lower the air pressure in the tire, then more of the tire will touch the ground, thus bringing the wieght back "up" when you do your calculations.
04-02-2003, 06:32 AM
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Originally posted by Dr Bonz
300 x 4 = 1200
I don't think you can weigh a 3400 lb car this way.
I suppose if you had 12 300 lb scales you could do it. Stack them up 3 high (4 stacks of 3, one for each wheel) and lower your car onto them. Then take the readings from all 12 scales and add them up.
The above is just a joke in case anyone actually was considering doing this or flaming me!
300 x 4 = 1200
I don't think you can weigh a 3400 lb car this way.
I suppose if you had 12 300 lb scales you could do it. Stack them up 3 high (4 stacks of 3, one for each wheel) and lower your car onto them. Then take the readings from all 12 scales and add them up.
The above is just a joke in case anyone actually was considering doing this or flaming me!
04-02-2003, 06:41 AM
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Actually that is not the link that I thought it was. But, it can be done using basic levers. I read a good articl on the method a few months ago but I can't remember where. Here is something I found on the interent that is pretty close to the method:
Take your 300# bathroom scale and get a block of wood (2"x4"?) near the same thickness as the scale. Get a piece of 2"x6" douglas fir (stronger than the usual spruce the home centers sell) 6' long. Can probably beg these from a construction site if you aren't a wood worker. Get a third piece of wood (4"x6"?) about a foot long. Now mark the long 2"x6" exactly 1/10th the way along its length. Jack up the front of the car and put the 4"x6" under 1 front wheel. All this is for is to keep the car level while measuring the wieght on the other wheel. Under the center of the other front wheel put the 1/10th line of the 2"x6". board should be placed sticking out the side of the car, not in front. Put the 2"x4" spacer under the short end of the 2"x6" and the bathroom scale under the long end of the 2"x6". They should be at the very ends of the board. Unless your car weighs 6000# in front the scale should be within range. Take the resulting weight reading and multiply it by 10 and that is very close to what 1/2 of the front end of your car weighs. Repeat for all wheels.
Take your 300# bathroom scale and get a block of wood (2"x4"?) near the same thickness as the scale. Get a piece of 2"x6" douglas fir (stronger than the usual spruce the home centers sell) 6' long. Can probably beg these from a construction site if you aren't a wood worker. Get a third piece of wood (4"x6"?) about a foot long. Now mark the long 2"x6" exactly 1/10th the way along its length. Jack up the front of the car and put the 4"x6" under 1 front wheel. All this is for is to keep the car level while measuring the wieght on the other wheel. Under the center of the other front wheel put the 1/10th line of the 2"x6". board should be placed sticking out the side of the car, not in front. Put the 2"x4" spacer under the short end of the 2"x6" and the bathroom scale under the long end of the 2"x6". They should be at the very ends of the board. Unless your car weighs 6000# in front the scale should be within range. Take the resulting weight reading and multiply it by 10 and that is very close to what 1/2 of the front end of your car weighs. Repeat for all wheels.
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