I have a G-Tech pro and have compared it to the strip timers. What I found is that mounting it very solidly is key to consistancy. The suction cup mount it comes with is too flexible, you really need to attach the hard mount. I used to use a Vericom VC2000 and it was within a tenth and 1 or 2 mph but it had a much better mounting system. The next time I go to the strip I will have the G-Tech hard mount and will be able to see if it's any better. As far as 0-60 times I was getting anywhere between 3.6 and 4.1 seconds but as I already noted the meter really needs to be solidly mounted so I won't claim those numbers are that accurate.
I've been told that the Gtech reads your actual MPH when finishing the 1/4 miles and at the track they clock your MPH before you actually finish.--I've heard this more than once but don't know forsure.
My MKII is not finished so I can't say what it runs, but my GTECH would read 3.9-4.2 O-60 in my 11sec dodge and that was a 3700lb car with 375 rear wheel HP, about 450-475 at the engine due to a very loose torque converter and stingy 727 tranny.
The G-Tech always read slower than the track timers with a higher mph. Actually thinking about it the roll out at the track may account for the ET difference and maybe the mph is just always high as FordManDan points out above. I need to go back and read the manual. I seem to remember there being a roll out setting and even a correction factor that may allow the mph to be fine tuned. I expect to be heading back to the track again soon so I will continue to expriment.
I have a G-tech (original version) that I use in my Volvo 850 turbo at the drag strip. I usually see about .1 to .2 faster times on the g-tech and about 3-4 MPG faster speeds. For the most part it is fairly acurate. I also read something like the g-tech is reporting actual speed for the MPH where the drag strip is using the distance between the 1000ft mark and the end of the 1/4 mile to do a calculation from the amount of time it took to clear that distance to find your final speed. So the g-tech should be a bit different for that measurement.
I hear the new one uses three gyros and is more acurate.
A forum community dedicated to Factory Five owners and enthusiasts. Come join the discussion about performance, racing, conversions, modifications, troubleshooting and drivetrain. We discuss MK4, GTM, 818, Type 65 coupe, roadsters, and more!