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Location:
Canberra
Registered:
May 2002
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GTECH accuracy?
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Wed, 19 March 2003 10:47
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How accurate are the GTECH performance timers supposed to be? During some testing of my 4AGTE last night (on a private road of course  ) the gtech gave a reading of 13.02 seconds at 190.5 km/h (119mph) for the 1/4 mile.
The terminal speed sounds a bit optimistic, but i'd be more than happy if it were true! This was repeated on 2 runs. If it is a reasonably accurate figure, then i'm off to eastern creek with some slicks (& a few more psi) for a timecard!
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I supported Toymods
Location:
Sydney
Registered:
June 2002
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Re: GTECH accuracy?
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Wed, 19 March 2003 10:59
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They are pretty accurate if setup correctly. the most it would be is about 13.17
A friend of mine has tested this at Eastern creek and compared it to a timeslip
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: GTECH accuracy?
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Wed, 19 March 2003 11:16
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190 does sound a little optimistic, if you're only running a 13
as said, they have to be set up properly (and even then aren't 100%). if you set them up wrongly, they can read a long way out.
apparently this is especially a problem in cars that squat off the line
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Location:
Canberra
Registered:
May 2002
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Re: GTECH accuracy?
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Wed, 19 March 2003 11:23
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my car doesnt squat off the line due to a fairly stiff rear end, although there was a fair bit of wheelspin through first & second gear which would have contributed to the slower time for the 190kph. The gtech was set at exactly 0.0 on a flat road.
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Location:
Sydney
Registered:
November 2002
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Re: GTECH accuracy?
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Wed, 19 March 2003 13:01
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I just used a g-tech pro in my crapbox ae102 7afe 3 or 4 days ago.
I set it to 0.0 exactly on a very flat street and got 8.something 0-100 then low 9.something 0-100, w/ a friend in the passenger seat and a full tank?? The old stopwatch test suggested a reading of about 10.5-11 seconds. It was also reading a 0-100 time before i even reached 100km/h (was still doing around 95 or less).
However, it read much more believable times in my mate's mitsu fto.
I reckon it just wasn't pointing straight when I set it in my car 
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I supported Toymods
Location:
Central Coast
Registered:
May 2002
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Re: GTECH accuracy?
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Wed, 19 March 2003 20:11
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Your speedo will be off, but 8.something and 9.something, well you'd be doin pretty good to get those times with a full tank and a mate in the car.
I was pulling low 10's (WOW!  ) in my AE93 with the 7AFE.
hehe and the 1/4 mile time... well a fully sik 16.something seconds!!
The 0-100 was not far off compared to the ol stop watch, can't wait till I get the fresh rebuilt turbo back on the soarer and get it crankin with a G-Tech... 
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Re: GTECH accuracy?
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Wed, 19 March 2003 21:47
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G-tech mph is not measured the same way it will be measured at the creek or at any official drag meet.
The speed reported is literally a terminal speed as calculated at a time when the error in a g-tech is at its greatest ( at the end of the run).
Normally terminal speed of a drag car is the average over a certain distance BEFORE (30 0r 60 feet ?) the finish line and so will be significantly less than as calculated by a g-tech.
In my experience g-techs are a little optimistic, 2 runs are not enough, better to do a whole lot of runs exclude the fastest and slowest and then average the rest.
Also it is a good idea to not slam gears home, esp 1st to second. Using this method it is possible to further improve your times and HP from the g-tech.
about a 30% higher hp figure can be acheived just through smashing 1st to 2nd.
Matt
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Location:
Brisbane
Registered:
November 2002
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Re: GTECH accuracy?
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Thu, 20 March 2003 03:17
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You guys are kidding right? You can't combine accurate and Gtech in the same sentence. Take your damn car to the drags.. it's cheaper than a gtech, it's legal, you get a printout of it AND there's no speculation.
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Location:
Canberra
Registered:
May 2002
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Re: GTECH accuracy?
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Thu, 20 March 2003 04:11
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Take your damn car to the drags.. it's cheaper than a gtech, it's legal, you get a printout of it AND there's no speculation.
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I do take my 'damn' car to the drags
its really great having to organise a trailer everytime because the fucking track is 300km away  . That aside, i'd rather go there anyday.
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Location:
melbourne
Registered:
March 2003
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Re: GTECH accuracy?
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Sun, 23 March 2003 08:45
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i have had a gtech in the car at Calder and compared to the timing equipment
if your car sqauts bad or wheelstands (like mine) the times are WAAAY out .especially MPH
when i first fitted ct26 to the 1uz at 6 psi i ran a 12.9 and gtech said 12.4
the biggest error you get with them is NOT using a DEAD level test track just a slight up or downhill and the results are way out .
im keen to use a dyno plus the have auto zero so small variations dont matter and they compenstae for the squat effect
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Re: GTECH accuracy?
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Sun, 23 March 2003 10:31
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Quoting from the g-tech requires a certain degree of honesty, both with yourself and with others when later skiting about times.
When testing - assess the road and HONESTLY say whter it is flat or not - if not then there is no point of running there.
There is a certain place - just off the f3 north of wyong. where late night runs can be seen to occur. Guys there quote amazing times as measured by g-tech's run after run.
Fact is Nann's corolla can do a 13 second pass under the same conditions. They refuse to acknowlege it is not perfectly flat -even though i have been accused of jumping the start there because i couldnt use the handbrake to launch and actually rolled away !!!!! - nearly hit the dude counting us down 
anyway - learn how the g-tech works, think about what might compromise its accuracy and then use it honestly as a comparison tool and nothing else. They can be fun, and definatley good enough to settle differences without going door to door.
Matt
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