Contour Enthusiasts Group Archives Forums General Dyno and Drag G-Tech?

Hey all,
I have a quick question. I see that you have all gone to tracks and dynos. As I haven't done any of these yet, I have a G-tech, which as some of you might know, it is capable of giving 0-60mph, 60-0, quarter mile and G-force, etc. Well I have a 98 CSVT, and when I do a 0-60 test it gives me like 6.7(8)sec. how realistic is that? Do any of you know how accurate these G-techs are? Any experiences with those?

I haven't done any mods. I just have better tires 225/50 R16 P-Zero Nero, K&N short ram, straight pipes and Superchips module (and front mount insert). I don't even think that, that will make the car over 200hp (as it is 195hp stock)...and the G-Tech shows that it is 170hp at the wheels...how is that possible? It should be like 165whp. Right?? and the G-tech should always give less whp as there is air drag at speed of 58mph.

first of all, im no scientist. im just going to give you my unscientific, uneducated guess until someone who knows what theyre talking about comes along.

the 0-60 sounds about right for these cars. csvts have dyno'd from 160hp to 175hp, iirc. it is typical for similar cars to have a different actual at the wheels numbers. (if that makes any sense

laatly, wind drag should not affect the hp that the car dynos. as the mafia says "it is what it is" the motor puts out the power that it can put out. drag, rolling resistence, weight and other variables affect its velocity.


now im no engineer, but from what ive learned i believe that is fairly accurate, give or take.

It's not that far off from what it really is. Not bad for a $40 black box. Mainly there useful when you do a mod and what to know if it helped or not, without having to go to the drag strip/dyno. But you need to do it on same strip of road, same weather conditions, etc.

The best thing that a g-tech is used for is comparing the car with itself. You can't use the g-tech to compare numbers with other cars because of differing variables dependent on the car (such as wind resistance and suspension set up). But the g-tech is very consistant with itself. Therefore it is a great tool to measure the affect a modification has on your vehicle. A couple of downsides to the g-tech is the fact that it requires an accurate weight of the vehicle, although it is kinda cool to be able to see what the power would be if you took some weight off the vehicle, and the suspension does play a small factor as well. Before you begin a run with the g-tech you have to level the device. Unfortunately when you accelerate the angle of the meter will change depending on how the suspension of the car changes. This does not affect it very much, especially if the front end doesn't lift much during accelleration, but it does affect it. All in all for the price this has proved to be a vary nice tool to have.

- Chris

well, the thing is that the E0 csvt is about 7.9 (from Ford), and some magazines give it around 7.0 (unofficial time). The thing is that I saw that many people say it's about 15.4-6 for 1/4 mile, while the g-tech, gave me 14.9sec. and i know i must have has some major upgrades to cut down with a half a second.
why the air drag affects the hp that the gtech measures?? well because it measures the hp at the wheels. however it measures the hp by using a formula...the sensor measures the acceleration of the car. the thing is that when you measure hp, you have to do it in 2nd gear...which means that you have to go all the way to 58mph or so. then, the car accelerates slower, and one of the reasons is the air drag. that's why they say that if you compare the gtech results with a dyno, the gtech's numbers will always be lower. check this link out: G-Tech HP
the thing is that my friend has a 99 csvt, and i will make him use the gtech, and see what he does. he is all stock, but should be faster. right?
I guess the only way to see how accurate that thing is to use it on a drag strip, and then compare the Gtech's numbers with the results from the track..

If you are going to insist on using a Gtech for any credible numbers, then a comparision would be required.

otherwise, you'd have to do multiple runs in 3rd (preferably) or 2nd, and get an average set of numbers for all data types while recording BOTH DIRECTIONS (to accomodate for any slope in the road and wind speed, etc.)