G-Tech Pro & stuff like accuracy
 

Just thought it should be known that its a pretty good tool :D

http://gtechpro.com/accuracy.html

Of course G-Tech is going to say their product is accurate :lol:

But, Russ in Sac used G-Tech to determine that his car had 900hp and 1000 lb/ft of torque.

that's pretty sweet.

that's user error :lol:

Im sure if I said my car's wieght was 10 tons then I could make all kind of power :twisted:

I have an old G-tech. It is a good tool to test your car and improve you shift point. I use to test my take off rpm and shifting rpm to get the lowest time. I never use the HP function.

my brother had a Gtech for about 2 hours.. He bought it.. tried it and found the speed/rpm/hp readouts were so far off.. it made him angry.. He returned it that same day. haha

us older folks might have a little more patiants when it come to calibraiting the tool. I have to think with as many users as there are with the G-Tech it just comes to dialing it down :D


EDIT: I suck at teh spelling

sp3iilng onws me todya :lol:

For sure. Calibration is very important with those things.

i thought that i had a good amount of patience in calibrating the gtech. i thought that the problem with that thing is that it is listening for the revs to match the rpms. in my car i could never get the rpm guage to read correctly on the gtech. im sure for measuring launches and 1/4mile time it is good....in my opinion if it is listening for rmp pick up then the machine will proabaly have a hard time with our cars(or any turbocharged car for that matter) since the sound of the car changes dramatically over the rpm range, unlike a N/A car. thats just my 2 cents on the thing....if you want one they sell them at summit racing.

out

The older G-Tech has a single accelerometer. It uses the ignition pulses present on the power lead to determine RPM (count's all the sparks and divides by 4 for 4 cylinder motors).

The biggest reason it's inaccurate is due to the requirement of making sure it's absolutely level in the car, and that the car is traveling on absolutely level ground. You also need to enter the test weight of the car very accurately in order to get good results, since virtually every result is calculated.

Every time the car pitches, rolls, or yaws, and every little bump in the road, or up or down hill spot will result in loss of accuracy for the accelerometer, because it's an acceleration not caused by the force of the motor.

G-Techs are fun toys, but not very useful for real "testing". You can use them for back to back comparisons, but not for comparisons to other cars.

I believe the newer G-Techs have 3 accelerometers, so they can triangulate the acceleration force vectors and attempt to filter out latteral and verticle G's caused by poor instalation and roll and pitch. So it's probably a bit more accurate, however, I still wouldn't consider it more than a slightly cooler toy than the 1st.

Yes, I have one.