loved the g whiz article in the attempt to pull 1g on street tires. real informative and detailed and thats why i love this magazine. i never knew about the indicated versus calculated g-forces wich brings a whole new scope of understanding my readings. and about your 15 dollar data loger, they have a new one called dynolicious log box, wich actually gives you data logging. great work grm.
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April 13, 2009 12:26 a.m. matt New Reader
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April 13, 2009 11:51 a.m. Tom Heath Production Editor
Glad you liked the story!
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April 21, 2009 4:20 p.m. gdeangel
I'm not a regular reader of grm, but bough this months issue because of this story. I've used the skidpad with data acquisition (Race Technology DL1) in the past to set up my own suspension .
The one question I have is why you had such a large difference between Indicated G's and calculated G's? If you calculate and remove the vertical component from your measured value (indicated x cosine(roll angle)), the correction factor is around 1% for expected roll angles of 5 degrees or less.
One other question is if the Traqmate software allows calculation and removal of offsets when the unit isn't mounted perfectly level and along the vehicle centerline?
Thanks
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April 21, 2009 7:38 p.m. Tom Heath Production Editor
gdeangel wrote:
I love hearing that. Thanks for checking us out.I'm not a regular reader of grm, but bough this months issue because of this story.
gdeangel wrote: The one question I have is why you had such a large difference between Indicated G's and calculated G's? If you calculate and remove the vertical component from your measured value (indicated x cosine(roll angle)), the correction factor is around 1% for expected roll angles of 5 degrees or less.
I was kind of surprised to see that much difference as well, but it's the relative changes that are most important. It's the comparison of before and after data that's important. We set a goal of 1g because it's considered a benchmark, but like the story says, it's just an arbitrary number. We're looking to extract the maximum potential, no matter the g reading.
gdeangel wrote: One other question is if the Traqmate software allows calculation and removal of offsets when the unit isn't mounted perfectly level and along the vehicle centerline?
The sensor unit is small enough that it can located it in the preferred orientation in just about anything, especially a street car. Also, I'd rather go out of my way to find a way to mount the sensors properly instead of changing the test methods. If the unit is mounted properly, you can at least be sure that you're recording solid data and measure differences. I'd rather avoid fuzzying the math whenever possible.
gdeangel wrote: Thanks
My pleasure!
