G-tech accuracy versus a real track

[Steve St.Laurent]

Some of you may have read that I went to the dragstrip yesterday. I wanted to test out the GLTDR club's g-tech to see how the accuracy was while I was there as well. Below is a chart of my times according to my time slips and what the g-tech showed for the same run. Overall, I'm pretty impressed with the accuracy. We had a 30 mph direct headwind yesterday and they say in the g-tech directions that wind will hurt the accuracy. It was a little slow on the ET and a little high on the mph most of the time. After looking at the results I'll definately continue to do multiple runs (I try to do at least 5) with the g-tech and average the times. It is pretty repeatable most of the time though - so you can use it for comparative purposes.

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-Steve St. Laurent - President of the Great Lakes TDR
'98 QC LB (CMNSPWR), 4x4, ISB, 5sp, 4. 10 LSD, TST Powermax3, 275hp RV injectors, Joe Donnelly modifed Sachs Clutch, custom ladder bars, SW fuel pressure gauge, BD exhaust brake, Isspro turbo temp monitor, front Draw-Tite receiver, rear Draw-Tite class V receiver, BFG 285/75R16 AT KO's, (all the common stuff clipped)

[This message has been edited by Steve St. Laurent (edited 04-09-2001). ]

 

[Archive]

Steve... Nice stuff! I bought a G Tech last fall, and have had a ball with it. I loan it out to guys all over town, and offer it for use at our BOMB parties.

I think it is great for measuring before/after changes in performance, also.

 

[Bill Kondolay]

Steve
Don't forget that 1/4 mph are not measured at the finish line but 30' or so before the finish line. On average 100 mph=101. 5 mph. At the race track your mile per hour is based on how long it takes you to go from the mph marker to the finish line. so if your trucks acceleration slows down you will have a slower mph. If your vehicle is still accelerating at top end of the race track you will actually get a high mph.

This is kind of difficult to explain but here is an example of something that often happens at the track. If you are running 15. 5seconds at 90mph all day, and on your last run you accidentaly lift of the throttle between the mph marker and the finish line you will still run around 15. 5 but your mph will now be about 84mph just because it takes you longer to achieve the short distance between the two markers at top end.

So in my opinion the only accurate reading would be the E. T. because they use the same method of timing.

Stefan Kondolay
DTT Tech Support