V8 Powered S2000
#442
Originally Posted by turbosix,Apr 22 2010, 08:41 PM
cat states they're within .1% at 80,000lbs.
my sub 3000lb car ends up not only weighing pretty much right where one would expect a stock ap1 minus heavy spare and toolkit, but also within 20lbs F/R distribution
with 20lbs being the actual resolution of the scales,
sure... you might not be actively "disputing anything" but you're hinting that my numbers are wrong when they fall in line close to whats expected.
2740 lb. for your car wouldn't totally surprise me, but I'd have more *confidence* in that number if it came from scales designed for and calibrated for weighing things more in the 5000 lb. range than in the 80,000 lb. range.
#443
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Originally Posted by ZDan,Apr 23 2010, 07:46 AM
Just pointing out that truck scales for weighing tractor trailers is not *necessarily* going to give you accurate weight (within a reasonable tolerance, say +/- 5 lb.) for a ~2800 lb. car.
#444
Originally Posted by Rodney,Apr 23 2010, 06:37 AM
i was a licensed scalemaster for over 10 years. as per state law, we had to have the scaled recertified every few years. i was 198lbs at the time, and it always read 200 when i was on the scales, no matter where i was, and we had 2 70' scales. ours read in 20lb increments, and you can set it for whatever you want. if you went with less, wind had a major effect on the scales, and it would never settle down.
#445
Originally Posted by Rodney,Apr 23 2010, 04:37 AM
i was a licensed scalemaster for over 10 years. as per state law, we had to have the scaled recertified every few years. i was 198lbs at the time, and it always read 200 when i was on the scales, no matter where i was, and we had 2 70' scales. ours read in 20lb increments, and you can set it for whatever you want. if you went with less, wind had a major effect on the scales, and it would never settle down.
Again, I'm not saying I think the 2740 lb. reading is *wrong*, only that scales for measuring 80,000 lb. weight are going to have a greater +/- range of error.
Nominally, the average error will be zero, but the RANGE of possible error on a 18-wheeler truck scale is going to be on the order of 10 times greater than the error (in the same units of weight) on a car scale. If a car scale may be off by pounds, a truck scale may be off by tens of pounds.
#447
My '01 must be unusually heavy...
#448
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Originally Posted by ZDan,Apr 24 2010, 07:19 AM
My '01 must be unusually heavy...
And if you car does weigh more than this, then yes your car is unusually heavy.
Thanks for the post Turbosix the proof is in the writing, dont know whats so hard to understand there.
#449
Just an FYI on S2k weights, with the same wheels/tires, fluid levels, exhaust, and an account for soft top, rear window, a/c ... all S2000 will be roughly the same weight. Early S2000s don't magically weigh less. The difference in wheels/tires, exhaust and rear window prove this. You also need to do the comparisons on the same scales, same time, etc. No different than comparing dyno charts. I have done this numerous times for stock class auto-x purposes.
I would find another S2000 owner to go with you next time. For proper comparison, make note of any changes and top that fuel tank off. Don't just speculate and assume all scales are equal. I have seen large variances. Your AP1 isn't unusually heavy unless there is something unaccounted for. That type of talk is nonsense and without a factual base. Multiple S2000s, same scale, same day or its not worth worrying about.
-Marc
I would find another S2000 owner to go with you next time. For proper comparison, make note of any changes and top that fuel tank off. Don't just speculate and assume all scales are equal. I have seen large variances. Your AP1 isn't unusually heavy unless there is something unaccounted for. That type of talk is nonsense and without a factual base. Multiple S2000s, same scale, same day or its not worth worrying about.
-Marc