As opposed to weighing the car, then pulling the axles and weighing them separately (simplified) and subtracting?
How often do you want to measure sprung weight?
DIY weight scale 4 corners, sprung weights
- Thread starter mrblaine
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As opposed to weighing the car, then pulling the axles and weighing them separately (simplified) and subtracting?
How often do you want to measure sprung weight?
Yes, as opposed to all the extra work. Even the extra work of weighing it with springs would be nice if simplified. Often enough that I'd spend 5-600ish to not have to do it the harder ways.
@mrblaine maybe something like these https://www.valleyvet.com/ct_detail.html?pgguid=048b4a47-760c-4c29-ac20-3c4a36a7b362&itemguid=c618f9ba-7c2c-4df4-8a49-d702bd705119&sfb=1&grp=6000&grpc=6300&grpsc=6370&sp=m&utm_content=15304&ccd=IFM003&gclid=EAIaIQobChMIuan84bWa-AIVvMLCBB2DKQDjEAkYAiABEgJZh_D_BwE They even have Bluetooth displays for them.
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I like the idea, looks like jegs has an option that does what you're looking for in the neighborhood of $2k. You can also buy them individually. This seems really reasonably priced compared to McMaster load cells of this capacity.
https://www.jegs.com/i/Intercomp/541/174002/10002/-1
Now the cheaper way that I'm imagining is to utilize standard corner weight scales but build standoffs or use your jackstands on top which have a known weight that reach up from the pads and support the upper coilover mount.
https://www.jegs.com/i/Proform/778/67650/10002/-1
https://www.jegs.com/i/Intercomp/541/174002/10002/-1
Now the cheaper way that I'm imagining is to utilize standard corner weight scales but build standoffs or use your jackstands on top which have a known weight that reach up from the pads and support the upper coilover mount.
https://www.jegs.com/i/Proform/778/67650/10002/-1
At this point, depending on the complexity of his Jeep, wouldn't it be easier to have the community weight various items and attack the problem that way?
I don't know what the end goal is here, just trying to offer up suggestions.
I don't know what the end goal is here, just trying to offer up suggestions.
When we tune or set up coil overs, we need a close to exact corner sprung weight. That gives us what we need to get the math done for the combined spring rate to set the rig at design ride height with the correct amount of preload.
Currently we acquire a spring that we think will get us close without being too stiff or too light and stick it on the coil over with a spacer to get us at approximate ride height. We do that at all 4 corners and then measure the compression of the spring to get us our sprung corner weights.
If I get total corner weights I can deduct actual bits I know the weight like axles and tires, but then I have to estimate how much of each link arm, steering link, driveshafts etc. are sprung/unsprung and it is easier to just measure sprung weight.
amazon has some cheaper universal load sensors, but you know that. . i'll ask around at work we build a few conveyors a yr with scales built into them using this type of sys.
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He's not just a jeep owner. He's a builder of his own and others Jeeps, so this isn't a one and done thing and would be a repetitive process for him. When I visited him in late April he was in the middle of someone else's midarm/coil over build with aftermarket axle housings, his own build including a frame and tub stretch, and had 4 ish other TJs parked around that belong to I don't know who.
The rest of the problem with the community weight thing is just how many would have very low cargo amounts, gas tank right behind front seats, and the top of the rear coil over mount just 4" forward of the tail lights.
I see a bunch of similar out there. I can't figure out the part where they use all 4 load cells to get a total weight and how to break that out into corner weights or if you only plug in one, will it give you that one and not show a fault that the other 3 aren't reading.
The best thing might be to start with a corner weight type setup, that gives you each corner weight (four numbers) then mod the existing or buy new cells that you can bolt into the shock mounts.
All the livestock type displays are going to resolve the four readings into one number... Cuz who cares how much a cow weights on each leg. You might be able to just unplug one and get an accurate reading, but I doubt it. There is some amplification and scaling going on... That means distortion, and then the system is
multiplying by 4.
All the livestock type displays are going to resolve the four readings into one number... Cuz who cares how much a cow weights on each leg. You might be able to just unplug one and get an accurate reading, but I doubt it. There is some amplification and scaling going on... That means distortion, and then the system is
multiplying by 4.
I've been thinking about this some more. I think I am wrong about air throwing off the reading. If there is air and fluid in the cylinder, the pressure on both has to be exactly the same. It can't be any other way.
Same thing I kept coming up with. Also why I suspect the corner weight systems cost what they do, you are essentially getting 4 livestock scale kits split into 4 discrete channels.
I might just get a digital hydraulic pressure gauge and plumb it into the reservoir hose on a shock to see what it says.
I've been thinking about it too. It's just like an emulsion shock when there is air and fluid together in the system, right? If that's the case, then yes, you should be able to get a correct pressure reading that you can translate into weight.
As long as displacement isn't a factor, pressure will be pressure. If the air compresses, you'll have more displacement at a given pressure, but the pressure will be consistent. If you run out of displacement, then the air will matter.
I don't think this works if we assume the springs are still holding the chassis up. The shock will just give you the internal pressure, as weight does not affect internal pressure.
Do you mean a shock in place, no spring?
my guy said similar........milliamps has to match., looks like both the scale and the sensor he posted are similar.
this is the 1 i mentioned fro Amazon it's vertical tension or compression. did not look at the details.
https://www.amazon.com/dp/B08C7HTLXR/?tag=wranglerorg-20
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That reads either.
I asked my guy how long it'd take him to setup a kit for me. He said two months. Not exactly quick.
I still think this setup would work and you can buy more load cells for under $100.
https://www.amazon.com/dp/B07CL5PP9K/?tag=wranglerorg-20
The load cells look to be threaded so some square tubing, plate, tap and some threaded rod should make a coilover replacement.
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