I'm 6 hours from the closest dyno center, and I don't wanna trust my "seat of the pants" dyno, so I need some way of measuring the mods I'm going to do. To those with experience or knowledge of/with the G-techpro. Is it worth the money, is it accurate, and where can I find one for a decent price.

--R rated who wishes he didn't live in such a crappy hick town in the middle of no where ; the only good thing is that the R gets lots of attention

 

...g-tech is a portable dyno? i thought that thing gave only very crude quarter mile times

 

yes the GTech pro gives hp/tq ratings, supposedly, and i mean SUPPOSEDLY they are decently accurate. keep in mind though a gtech can not give A/F ratios....

 

I have the Gtech and if you use it right you can use it somewhat like a dyno. Not that I would say it's a replacement for a dyno, but if you can't get to one it can be useful.

First thing to do is forget that it can give you an HP number. Peak numbers mean nothing especially when tuning. The real useful feature of the Gtech which I think most overlook is the constant g-force readout.

I logged my accelerational g-force as I did a full throttle pull from 3000 RPM to 8400 RPM. I plugged the numbers into Excel doing a G's vs RPM graph and out came chart shaped EXACTLY like the torque curve on my dyno chart.

So if you use the g-tech that way and forget about whatever HP number it gives you, I think you can use it to find out what will give you better accelerational ability throughout the RPMs. The only trick is how you are going to log RPM and g-force. My digi cam is able to take small 15 second movies so I basically just had it capture the tach and g-tech as I accelerated. Then I watched the movie that my camera made and entered the g-force numbers at 500 RPM increments.

Other than the G-Tech of course there are affordable datalogging options for you. Recording a speed vs time chart and comparing that when tuning will also be useful. There's options out there, the dyno is of course the quickest and easiest but sometimes you got to make do with what you have.

 

If you are really into it, check out:

http://www.race-technology.com/WebPa.../DcatHome.html

 

another thing is the timing features....nothing shows improvements in performance like accurate timing (0-60, 0-100, 30-80, etc)

 

anyone seen one of these?...its suppose to measure HP too, but I don't know how it works...its made by Apex'i...any ideas?

 

doing the math

 

I'll sell you mine for $50.00 shipped. I don't ever use the thing.

 

g-tech = ghetto-tech

 

don't waste you money man, those kind's stuff can never tell you the ture!

 

If i were to get a gtech, i would get the gtech pro competition model. It has some very nifty features.



Graphic Displays Shows RPM, Horsepower and Torque

Great For Analyzing Shift Points and Engine Driver Performance

Contains A Full Blown Data Acquisition System

Stores Sessions And Download To a PC

G's, Torque and Horsepower

RPM

Intelligent Shift Light

Traction and Cornering Light

Sorry if this seemed like an ad. I don't even have the thing...(for more info goto http://www.racerpartswholesale.com/gtech.htm
)

 

There is a brand new G-Tech Pro, which has a dot matrix display, data logging features, and plots engine RPM vs. torque/power. It does some neat signal processing on the electrical noise that comes out of the cigarette lighter to deduce the engine's rpm. It also has a 3-axis accelerometer so that it no longer needs to be perfectly level to work. It looks like a pretty useful tool for easy measurement of your car's performance.

While I was writing this... ITR501 posted a pic!



[Modified by Gansan, 2:56 PM 6/29/2002]