anyone used a G-tec? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Oborny71 · 02-26-2003, 03:29 PM

Iwas curious about those G-tec performance monitors that are supposed to give you your 0-60, 1/4 mile , ect.. Have any of you guys ever used them? I wanted to get one so that I could better tune my engine. How accurate are those things? thanks...

Project1970 · 02-26-2003, 03:43 PM

I think they have two now...

I've used the older one; my dad got one along with a bunch of friends (since you don't really use them that often). I don't know about 0-60, I don't have another way to test that...the HP numbers are all over the place...the 1/4mi ET and MPH numbers are close, though. I believe one is consistently high (MPH) but they are repeatable...meaning you can still use it as a baseline/tuning tool, but I would NEVER go bragging about cutting a new fast time and using a GTech as proof instead of a timeslip. They're not that accurate.

GMC71k20 · 02-26-2003, 05:01 PM

i think the new one is completly revised, how does it get hp numbers from pluggin it into a cigarette lighter?

REPO1 · 02-26-2003, 05:07 PM

As I recall, the 1/4 mile times are about .2 of a second on the fast side usually.

Still all-in-all pretty close.

benwantland · 02-26-2003, 05:31 PM

GMC71K20, the way they work is that they measure the force of acceleration, and if you know how hard something is accelerating, for how long, you can calculate all kinds of useful info, and to get the HP measurements, you input the vehichle's weight, and then it factors that in to estimate horsepower..... one of the first things we talked about in high school physics was the difference between accuracy and consistency, and I think the g-tech is a perfect example: It, in my experience, is very consistent, making it a great tuning tool, but the accuracy can be from decent to poor- especially on the horsepower estimates, because I never know the right weight, and some of your horsepower is used up overcoming wind resistance as speed increases...... FWIW, I have one of the cheap models, and still would recommend that everyone get one or at least get access to one; they are definitely useful and have their place.

Old Chevy · 02-26-2003, 05:44 PM

I have a G-Tech, and it is my most loaned out tool. It seems pretty accurate 0-60, 1/4 mile. It is wildly off on HP, but it is consistent. Spinning through first, 0-60 in 6.6, not a rocket, but acceptable for a truck.

Cheers

Richard

02-26-2003, 03:29 PM	#1
Oborny71 Registered User Join Date: Apr 2001 Location: Lincoln, Nebraska Posts: 587	anyone used a G-tec? Iwas curious about those G-tec performance monitors that are supposed to give you your 0-60, 1/4 mile , ect.. Have any of you guys ever used them? I wanted to get one so that I could better tune my engine. How accurate are those things? thanks... __________________ 67 Chevy SWB - goal of a 1,000 hp weekend cruiser

02-26-2003, 03:43 PM	#2
Project1970 14.1 @ 96MPH Join Date: Jul 2001 Location: Mesa, AZ Posts: 2,811	I think they have two now... I've used the older one; my dad got one along with a bunch of friends (since you don't really use them that often). I don't know about 0-60, I don't have another way to test that...the HP numbers are all over the place...the 1/4mi ET and MPH numbers are close, though. I believe one is consistently high (MPH) but they are repeatable...meaning you can still use it as a baseline/tuning tool, but I would NEVER go bragging about cutting a new fast time and using a GTech as proof instead of a timeslip. They're not that accurate. __________________ Project1970 - LS1 Swap Complete!

02-26-2003, 05:07 PM	#4
REPO1 Shortbox wanna-be. Join Date: Mar 2002 Location: Fort St.John, British Columbia, Canada Posts: 773	As I recall, the 1/4 mile times are about .2 of a second on the fast side usually. Still all-in-all pretty close. __________________ 1970 Chevy C20 Custom Camper 402BB Turbo 400 trans. (Slowly becoming a '70 shortbox 1/2 ton) '71 Camaro SS 402/T400 resto '97 Z28 (11.41@127MPH)

02-26-2003, 05:44 PM	#6
Old Chevy Registered User Join Date: Jan 2000 Location: Tulsa, Oklahoma Posts: 498	I have a G-Tech, and it is my most loaned out tool. It seems pretty accurate 0-60, 1/4 mile. It is wildly off on HP, but it is consistent. Spinning through first, 0-60 in 6.6, not a rocket, but acceptable for a truck. Cheers Richard __________________ Broken Arrow, OK. 1977 Corvette, ZZ4 Crate, new interior, new suspension, new driveline, you get the picture, (new project / daily driver)

02-26-2003, 05:01 PM	#3
GMC71k20 Registered User Join Date: Aug 2002 Location: mass Posts: 1,277	i think the new one is completly revised, how does it get hp numbers from pluggin it into a cigarette lighter?

02-26-2003, 05:31 PM	#5
benwantland Registered User Join Date: Oct 2002 Location: Iowa Posts: 71	GMC71K20, the way they work is that they measure the force of acceleration, and if you know how hard something is accelerating, for how long, you can calculate all kinds of useful info, and to get the HP measurements, you input the vehichle's weight, and then it factors that in to estimate horsepower..... one of the first things we talked about in high school physics was the difference between accuracy and consistency, and I think the g-tech is a perfect example: It, in my experience, is very consistent, making it a great tuning tool, but the accuracy can be from decent to poor- especially on the horsepower estimates, because I never know the right weight, and some of your horsepower is used up overcoming wind resistance as speed increases...... FWIW, I have one of the cheap models, and still would recommend that everyone get one or at least get access to one; they are definitely useful and have their place.



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