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Author
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Topic: g-force accelerometer question
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stoker
Gearhead Posts: 110
From: folsom,cal,
Registered: Jan 2002
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posted 05-13-2002 01:11 PM
  
anybody use these and compare accuracy to actual 1/4 mile? i was thinking of jetting carb. with it.please tell of your experience.
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John1966
Journeyman Posts: 23
From: Hartford, CT
Registered: Nov 2000
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posted 05-13-2002 03:25 PM
Car Craft did a comparison when the G-Tech first came out. In the quarter mile it was accurate to +/- 0.1 sec and 1-2 mph vs the dragstrip timer.I have one but only used it to estimate rear wheel horsepower. It's real advantage is indicating how much better or worse a modification was that you may have made to your engine. In my case, I made some timing adjustments and improved by 3 hp. My Gtech read 165 before the change, then 168 after. I don't know if 168 is correct (because you need to input the weight of the car with everything included, and I don't know if I got the right weight)but keeping the weight number the same, the HP increase was 3. 3 greater than what, I'm not sure. Its tough to use on the street because you need a straight, flat surface, with no wind. Hope this helps, ------------------
Thanks,
John '66 coupe, 289, c-4,3:20 open rear,headers, holley 4160, duraspark ignition.
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mustangboy
Gearhead Posts: 462
From: Ont, Canada
Registered: Mar 2002
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posted 05-14-2002 02:19 AM
The g-tech is close for the et but differs in the mph calculation for the quarter mile.At the strip your speed is averaged over the last say 100ft(i forget the exact distance)where as the g-tech gives you the speed at the exact end of the quarter mile so the g-techs speed will always be higher than at the track.
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richard bohm
Gearhead Posts: 373
From: tucson,az-luray,va
Registered: May 2001
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posted 05-14-2002 04:31 AM
the speed measurement at the top end of the drag strip is a 66 ft zone. the speed is calculated by how long it takes the car to cover that zone from start to finish. they speed readings between the two should be very close. as the commercial said the car mags tested it and now they test with it. that should tell you something.
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mustangboy
Gearhead Posts: 462
From: Ont, Canada
Registered: Mar 2002
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posted 05-14-2002 01:05 PM
Don't misunderstand me I'm not knockin the g-tech, I'm just saying your mph will be a little higher than what you will see at the track because of the differences in the way the speed is calculated not that there is a problem with the g-tech.The ET should be very close.
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