just bought one of those g-tech performance meters and I was wondering if anyone else has one. I ran my 97 Z28 a4 (SLP Intake) and I ran a 5.47 0-60 and a 13.68@114 in the 1/4 mile. I read alot of information and history about it before I bought it and supposedly they said it is very accurate. I was very surprised with my runs and its a neat little tool to measure your cars performance. does anyone else have one of these and what are your opinios about it?

 

i dont have one but have used one. i getect my z and i got 14.1 at 110 but i am verry cosistent 14.00 at 99mph the mph is way off on the gtechs

 

Times are usually a few tenths off and the trap speeds are usually way high

 

I have a G-tech. They are pretty worthless compared to track times.

 

I've used mine at the track several times with my old Z28. ET's were very close to track ET's and mph was pretty consistently 4 mph high. A caveat though, is that you have to take great care to ensure the GTech is level and it's not touching the windshield.

Steve, if you think they're worthless compared to track times, you didn't take the time to learn how to use it correctly.

 

I did take the time to learn. I found the same thing as you. Close ets and mph about 4+. I don't like them because you have to level it perfectly, the mph is off, the street has more traction than the track, nobody takes them seriously, etc.

 

So what were your times STEVE Y???? I thought you only did those grudge matches where you dominated LS1's but no times were given.

TONY

I've used one before. ET was very close but mph was way high.

 

I ran a 14.9 at 98.5 or so with pulleys only at 5000' elevation on the street. That is the only g-tech time I have with the car. Yes, a stock LS1 has never beat me yet at the track.

 

Guys

You all are correct in saying the Gtech mph is high. The reason behind this is that the G-tech actually gives you your actual mph at the end of the run. When you are at the track; the mph is an average over the last XX feet (not exactly sure how much). I was told this by an experienced racer. The Gtech still gives high mph readings but the majority of that is because it is giving you the car's actual speed. And as far as the times go...it is usually correct with in 1 tenth of a second. If you want to properly compare the gtech results to the track results; you need to install the gtech at the track and get the results from both and THEN compare.

Heavy

 

He says its useless then agrees w/ you that the times are just about right on...Way to stick w/ what you say Steve lol...

Its a good tool if the tracks not close or if your short on time.

 

I agree. I've never used the 1/4 mile function because I can't find a straight road long enough around me, but I do hp runs all the time and the G tech is spot on with the dyno. It's also a great tool to see what mods add what hp. It still amazes me how much more hp my car makes in 45 degree weather vs. 95 degree weather. I average about 323 rwhp in the heat with the Gtech (I dyno'd at 321 on a dynojet in 94 temp) and I average about 345 rwhp with the Gtech when it's below 45 outside (dyno'd at 341 @ 43 deg.)

Jason

 

the g-tech is quite accurate if you understand the calibration of it,i am not tryin to be an a-hole but i hear people bad mouthing an instrument that they don't really understand how to use.it has to be level-0- when you stage the car,the g-tech begins its clock via inertia that occurs before you can break a timing beam at the track,that is what gets you the variance of E.T. its usually 5mph fast and up to 2 tenths off of track times.
the g-tech i had for 6 years was as on the $ as it could be it would bracket race with it.
dialed in at a 12.2 @112 according to the track.
g-tech would say 12.1@117 it is very accurate due to inertia being the result of movement not a timing beam where your car could be plus or minus 3"s

 

It's called an accelerometer. The problem with it though is not the device, but the application. It's very hard (at least where I live) to find a clear, straight, completely flat road to get an accurate measurement.

Jason