SSBeaumont Posted December 21, 2004 Report Share Posted December 21, 2004 Thought it would be appropriate to start a new thread seeing how we all need something to measure our performance. Any comments on the Gtech? Link to comment Share on other sites More sharing options...
jboyd2004 Posted December 21, 2004 Report Share Posted December 21, 2004 I'm not questioning their accuracy per se. I'm questioning whether or not you should base test results on measurements that could be questionable based on a 10hz sampling rate. It may be okay if you slowly increase your rpm, but I still wouldn't want to base a decision on any modification off of a gtech measurement. On top of that, you can't increase slowly because you have to hit a certain glevel to trigger the DAQ. The high priced DAQ equipment is high priced for a reason (greater sampling rates and accuracy). That equipment is what you would base test results and decisions from. Granted, not everyone has access to the best DAQ equipment. Still, gtech did not put this out as test equipment. It is there to give a rough estimate of where you currently are. Unless you drastically change hp, I don't think you could say any minor changes in hp using the gtech equipment is valid for proving a modification works . Link to comment Share on other sites More sharing options...
SSBeaumont Posted December 21, 2004 Author Report Share Posted December 21, 2004 It sounds like you are saying in a nice way-don't buy the Gtech? Link to comment Share on other sites More sharing options...
jboyd2004 Posted December 21, 2004 Report Share Posted December 21, 2004 It depends on what you want it for. For a quick estimate of where you are power-wise, I seems like it would be ok. Link to comment Share on other sites More sharing options...
SSBeaumont Posted December 21, 2004 Author Report Share Posted December 21, 2004 I want it for telling me whether a part works or not (headers, exhaust etc.) Link to comment Share on other sites More sharing options...
jboyd2004 Posted December 21, 2004 Report Share Posted December 21, 2004 Try it and see if it works. $200 is a small price to pay if it works. I don't doubt that it works. I just wouldn't trust the readings it gives. As long as it shows an increase when it should and a decrease when it should, it's working. It's probably worth the risk. I'm lucky enough to have access to some serious DAQ equipment, so I don't have to worry about it. ;) Link to comment Share on other sites More sharing options...
haulin79 Posted December 21, 2004 Report Share Posted December 21, 2004 I along with a few others here actually have a Gtech Pro Competition. It's a wonderfully repeatable device. In "road racing mode" jboyd2004 is correct in saying that the sampling rate is 10Hz. It is also user adjustable up to 20Hz. HOWEVER, in "drag strip mode" the accelerometers sample at 400 Hz, data process, and then datalog at 100Hz. This is in contrast to: Land and Sea chassis dynamometers - 200 Hz OBDII Handheld Scanners - 25Hz high, 12 Hz typical Dynapack dynamometer data aquisition - 10Hz If you don't have an AWD Chassis Dyno with long wheelbase capability near you I highly recommend the GTech Pro RR at $300. Or you can call jboyd2004 and try get him to lend you his high $ data toys from his work But as you can see from the Gtech site, it's hard to get more accurate even for MUCH more money: http://www.gtechpro.com/accuracy.html It'll make a nice Christmas gift to your SS. I'm questioning whether or not you should base test results on measurements that could be questionable based on a 10hz sampling rate. <{POST_SNAPBACK}> Link to comment Share on other sites More sharing options...
jboyd2004 Posted December 21, 2004 Report Share Posted December 21, 2004 That's good info. I couldn't find all the info on their site. Link to comment Share on other sites More sharing options...
XGMTech Posted December 21, 2004 Report Share Posted December 21, 2004 Great info haulin79... I already decided a few weeks ago to get my truck one for Christmas. I only planned on getting one just to play around with it, and to use the info from it as a rough estimate, but those statistics you posted sounded pretty impressive. And since I heard yesterday that our local strip has been overrun by ricers and it's too crowded on test and tune nights, this might be an alternative for the time being. Link to comment Share on other sites More sharing options...
Dylan06SS Posted December 22, 2004 Report Share Posted December 22, 2004 After seeing the Gtech in action when testing the Outlaw system I want one! Link to comment Share on other sites More sharing options...
SSThunder Posted December 22, 2004 Report Share Posted December 22, 2004 haulin79: Great Info. You've pretty much sold me on the unit(purchase will have to wait). Wonder if they will let me sign-up as a dealer?? I'll have to contact them Good thread. Thanks to all for the great info on a useful item I along with a few others here actually have a Gtech Pro Competition. It's a wonderfully repeatable device. In "road racing mode" jboyd2004 is correct in saying that the sampling rate is 10Hz. It is also user adjustable up to 20Hz. HOWEVER, in "drag strip mode" the accelerometers sample at 400 Hz, data process, and then datalog at 100Hz. This is in contrast to: Land and Sea chassis dynamometers - 200 Hz OBDII Handheld Scanners - 25Hz high, 12 Hz typical Dynapack dynamometer data aquisition - 10Hz If you don't have an AWD Chassis Dyno with long wheelbase capability near you I highly recommend the GTech Pro RR at $300. Or you can call jboyd2004 and try get him to lend you his high $ data toys from his work But as you can see from the Gtech site, it's hard to get more accurate even for MUCH more money: http://www.gtechpro.com/accuracy.html It'll make a nice Christmas gift to your SS. I'm questioning whether or not you should base test results on measurements that could be questionable based on a 10hz sampling rate. <{POST_SNAPBACK}> <{POST_SNAPBACK}> Link to comment Share on other sites More sharing options...
SSBeaumont Posted December 22, 2004 Author Report Share Posted December 22, 2004 Thank you for clearing up this topic! I was getting worried for a sec. I had my heart set on a Gtech. Now I have more confidence in it. I guess the technical questions bring out the nerds from the woodworks. Thanks again. Link to comment Share on other sites More sharing options...
hank Posted December 24, 2004 Report Share Posted December 24, 2004 i need to get one of these to see where i am at. Link to comment Share on other sites More sharing options...
CraigW Posted December 26, 2004 Report Share Posted December 26, 2004 I have owned a gtech for a while now and The only use as stated above is t see if a certain mod accutually makes any improvements. From my experiencewith it it does. I first made 4 stock runs then took average of these as my baseline and after every mod 4 more runs and an average and compare that to the first runs was how you could see your improvements. For this the gtech works very well. I will say unless you run it at a strip to compare its number to theres I wouldnt say its 100% accurate either. Link to comment Share on other sites More sharing options...
hank Posted December 27, 2004 Report Share Posted December 27, 2004 is it even close to track numbers if the right weight and other factors are put in? Link to comment Share on other sites More sharing options...
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