Gtech Pro Performance Meter
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From: OC
Gtech Pro Performance Meter
Anybody know anything about the Gtech Pro Performance Meter ? Whether it's good or bad ???
link :
http://www.gtechpro.com/products.html
Any feedback welcome
link :
http://www.gtechpro.com/products.html
Any feedback welcome
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Joined: May 2003
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I've got one (don't have an Evo though). I liked the G-Tech Pro alot, and it seemed fairly accurate (i.e. within .2 or .3) of actual 1/4 mile drag strip times, but it's MPH is higher than the numbers you will get at the drag strip (since the strip MPH speed is averaged near the end of the track).
The G-Tech is good to use for your own personal performance tuning if you don't have a drag strip nearby (or if you don't want to continue to pay $15 track fees each time you want to test). I used mine to establish some consistent baselines, and then used it again after I put some mods on to get an idea of how much performance each mod provided. It worked pretty well.
The G-Tech is good to use for your own personal performance tuning if you don't have a drag strip nearby (or if you don't want to continue to pay $15 track fees each time you want to test). I used mine to establish some consistent baselines, and then used it again after I put some mods on to get an idea of how much performance each mod provided. It worked pretty well.
The data from a G Tech is pretty crappy. The methods it uses for calculating acceleration/speed are shaky, at best. However, for $140, it's one of the more cost-effective ways of getting an idea of how fast your car is, and the effects of mods.
For what it's worth, if you can determine the pitch center of your car, and mount it rigidly to that point, you can actually get good results from it. The problem, of course, is determining the pitch center...
For what it's worth, if you can determine the pitch center of your car, and mount it rigidly to that point, you can actually get good results from it. The problem, of course, is determining the pitch center...
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From: OC
Originally posted by WestSideBilly
The data from a G Tech is pretty crappy. The methods it uses for calculating acceleration/speed are shaky, at best. However, for $140, it's one of the more cost-effective ways of getting an idea of how fast your car is, and the effects of mods.
The data from a G Tech is pretty crappy. The methods it uses for calculating acceleration/speed are shaky, at best. However, for $140, it's one of the more cost-effective ways of getting an idea of how fast your car is, and the effects of mods.
By the way I was actually referring to the G Tech Pro Performance meter ( $240 ), but believe you comments regarding the G Tech Pro are a good yardstick.
Originally posted by WestSideBilly
For what it's worth, if you can determine the pitch center of your car, and mount it rigidly to that point, you can actually get good results from it. The problem, of course, is determining the pitch center...
For what it's worth, if you can determine the pitch center of your car, and mount it rigidly to that point, you can actually get good results from it. The problem, of course, is determining the pitch center...
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Joined: Mar 2003
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From: Kitchener, Ontario
i've got one.
It seems fairly accurate.
It actually will hp readings that in some respects are more realistic than dyno's. For example, dyno's dont get the amount of air into a sri or a cai that actually being on the road will, meaning the result, if it can be trusted, is more realistic in some situations. Theyre literature pretty much says take everything with a grain of salt, but as a way of benchmarking performance gains from a baseline set by the unit, it's an effective tool.
It seems fairly accurate.
It actually will hp readings that in some respects are more realistic than dyno's. For example, dyno's dont get the amount of air into a sri or a cai that actually being on the road will, meaning the result, if it can be trusted, is more realistic in some situations. Theyre literature pretty much says take everything with a grain of salt, but as a way of benchmarking performance gains from a baseline set by the unit, it's an effective tool.
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Joined: Jan 2003
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From: NR Reading PA
The website states the Competition Model ($249) has an "auto leveling" feature which aids accuracy. I think I'll buy one then compare the results to xtnct's Road Dyno. Should be interesting.
Speedlimit...
Speedlimit...
The GTech (all variations) uses an accelerometer, or more specifically, 3 accelerometers. When you do 0-60, it assumes you are stopped, level, etc. When you accelerate, it takes the change in acceleration and integrates it to find speed, and integrates again to find distance. Each integration degrades the accuracy. So, it's far from perfect, it's more of a highly educated guess. Again, for $140, it's tough to beat. I could show you some acceleration data from much more expensive GPS based systems as a reference, and show what integrating does to the accuracy of it, but I think you get the just.
As for the mounting spot, since the GTech lacks a gyro to determine roll, anywhere above the pitch center (for most cars, this is about the level of your butt) will add in rotational error. It's small in the grand scheme of things, but it's present.
I don't want to dissuade anyone from buying one - they're actually a cool toy but you should treat it as such. The acceleration numbers I'd take at about 95% accuracy, but some of the other info (particularly horsepower) I wouldn't put too much faith into.
Have fun...
As for the mounting spot, since the GTech lacks a gyro to determine roll, anywhere above the pitch center (for most cars, this is about the level of your butt) will add in rotational error. It's small in the grand scheme of things, but it's present.
I don't want to dissuade anyone from buying one - they're actually a cool toy but you should treat it as such. The acceleration numbers I'd take at about 95% accuracy, but some of the other info (particularly horsepower) I wouldn't put too much faith into.
Have fun...
Admin Emeritus
Joined: Jan 2003
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From: NR Reading PA
Hi,
I speak dv dt. The absolute accuracy is secondary to the consistency of the gizmo for me. Using comparisions for practicing shifts, cornering and elapse times could be useful. I agree the peak HP and torque numbers will be of little value.
Speedlimit....
I speak dv dt.
The absolute accuracy is secondary to the consistency of the gizmo for me. Using comparisions for practicing shifts, cornering and elapse times could be useful. I agree the peak HP and torque numbers will be of little value.Speedlimit....
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From: Minneapolis
WestSideBilly is just about right on. At the track they will be within a few tenths (though your trap speed will be a higher on the g-tech) because tracks are generally very flat. G-techs are cool for determining 0-60, 0-100, and 1/4 mile times, but that is about it. Still for their cost they are pretty cool, and you can easily move them between cars unlike some of the other performance cailbration tools.
