I am looking to purchase one of the new G-tech's and was wondering how these things worked and how accurate they are. I read their website but obviuosly they are going to say good things about it. What are your guys experiences with them? Are they worth the cash?

 

i bought one of the older models on ebay for like 30 bucks. had it on a few different cars, everytime et was way off, but mph was give or take 1

 

I also got mine from ebay. I tested mine at the track and the ET was right on the money. To the .01 on about 80% of my passes. I found that the MPH was about 4 Mph faster with the gtech then at the track.

 

I bought the G-Tech Pro new for $250...talk about a kick in the pocketbook. I find the entire device to be HIGHLY accurate, except it's a TAD optimistic in the 1/4 ET. I'd say take your GTech ET, and subtract one or two tenths....and leave the mph about the same. Mine is pretty close in the mph. As far as the 60' goes...HIGHLY accurate again. I can NEVER break a 2.2 60' at the track,and the G-Tech shows the same thing. Its worth its weight in gold just to be able to fine-tune your launch with that. The 0-60 time is also quite accurate as compared to my 1/4 mile timeslips put into a 0-60 calculator. Within about 2/10ths of a second.

AWESOME device. Pricey, but worth it if you're really into tweaking with your car or specifically, if you're testing different setups, fuel settings, timing, etc.

 

Sweet, looks like I will be getting one then I really just want to know What my car will do before and after my 350 swap. Plus i can use on my other vehicles also. And see which one is really the fastest

 

the $30 ones still on ebay or is that long gone?

 

i got mine a few months ago, i'm sure they are still the same price.

 

This comes up fairly often and I'm sure a search will bring up some good info. But as I recall they are pretty accurate but measure the 1/4 differently than the track does somehow but don't remember the details as to why so the numbers are a little off. Would be fun to play with if I had that kind of money to blow.

 

Oh, also I forgot to note.....I dont know if all G-Techs have this, but mine does. It's also got an optional tree on it. So if you want it to be more like the drag strip, and give you a reaction time...you can enable the tree. Not sure if it has any bearing on the ET's.....probably not though.

 

The main difference is in MPH because the G-Tech measures actual speed at the end of 1/4 mile, whereas at a dragstrip your "Trap Speed" is the average speed measured over the final 60 feet of the 1/4 mile. That is why the G-Tech MPH is higher, it is more accurate than the timed and computed speed "trap speed" at a dragstrip. Also the 1/4 mile ET will vary because the G-tech starts from the go whereas the dragstrip timers don't start until you break the first beam, so you can actually get a running start before the clock starts at the strip. This is done by shallow staging which increases rollout. It decreases your ET but increases your reaction time. It also can give a slight increase in MPH.

 

I stage as shallow as humanly possible. I need all the help I can get, with my transmission problems and crappy launches.

And you know, I've never seen anyone actually EXPLAIN why the G-Tech times/speeds vary from a drag strip. Awesome explanation! I never knew that the drag strip "calculated" your speed..I assumed it had some kind of sensor or IR beam or something, like a radar gun....