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Old 10-07-2005, 23:48   #1 (permalink)
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G-tech timers & AU2 XR8 ute times

just purchased a new work ute - au2 XR8 manual 200kw 420nm has headers 2.5 exhaust,superlow springs monroe shocks only 42ks on the clock did over dozen runs on my G-tech timer ,having trouble getting a decent
start without losing traction but even when i did get a decent start I,am getting slow times mid 8sec 0 -60mph 1/4 mile 16+ sec ,pissing me right off don,t know if its my G-tech thats wrong or the ute , did use G-tech recently on mates ba ute XR8 manual getting mid 14,s Traction also prob

thing is the ute feels like its got more torque down low than my EF XR8 manual which
did low 15s 1/4mile ,hit a steep hill in 5th no worrys for the AU ute not so for the EF sedan -CDI powerchip will be getting fitted soon
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Old 10-08-2005, 00:50   #2 (permalink)
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Re: G-tech timers & AU2 XR8 ute times

Have you done the G-tech run in both directions, that may show if there is any slope in the road. The main issue with your times however is probably your launch, get that right and you should see some better times.
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Old 10-08-2005, 01:08   #3 (permalink)
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Re: G-tech timers & AU2 XR8 ute times

Quote:
Originally Posted by jm EF XR8
just purchased a new work ute - au2 XR8 manual 200kw 420nm has headers 2.5 exhaust,superlow springs monroe shocks only 42ks on the clock did over dozen runs on my G-tech timer ,having trouble getting a decent
start without losing traction but even when i did get a decent start I,am getting slow times mid 8sec 0 -60mph 1/4 mile 16+ sec ,pissing me right off don,t know if its my G-tech thats wrong or the ute , did use G-tech recently on mates ba ute XR8 manual getting mid 14,s Traction also prob

thing is the ute feels like its got more torque down low than my EF XR8 manual which
did low 15s 1/4mile ,hit a steep hill in 5th no worrys for the AU ute not so for the EF sedan -CDI powerchip will be getting fitted soon
I have just done the same and ebay'd a g tech, went for a run today, same ute as yours except a unichip and my problem was traction as well. I think it all comes down to the launch, a warmer day, more practice to find the right launch revs and a road safe enough to try out the quarter mile. I am a bit sceptical of the horsepower reading, the first one read 369 hp, no way thats accurate, it should read around the 200hp mark. I will try again tommorrow.
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Old 10-08-2005, 01:14   #4 (permalink)
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Re: G-tech timers & AU2 XR8 ute times

What weight are you guys entering?
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Old 10-08-2005, 01:19   #5 (permalink)
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Re: G-tech timers & AU2 XR8 ute times

Quote:
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I am a bit sceptical of the horsepower reading, the first one read 369 hp, no way thats accurate, it should read around the 200hp mark. I will try again tommorrow.
Sounds like the vehicle weight was not correct, technically if you get the weight correct the power will be correct. The best way I find it to calibrate it to a known dyno result or roughly to the expected power figure then you have an idea.
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Old 10-08-2005, 01:32   #6 (permalink)
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Re: G-tech timers & AU2 XR8 ute times

Take your cars to a weight station and get it weighed (with you in it and note how much fuel in tank). Then enter that on your g-tech. It will be much more accurate then.

My g-tech was about 0.1 to 0.4 sec slower than my actual quarter times. I'd run them side by side and compare.

Remember, a GOOD ET is all about the launch ans no wheel spin. You'll note that your MPH each time is almost the same. Spin your wheels a fraction and you'll lose HEAPS of time.

Try riding your clutch a little 'till she gets off the line or launch with lower rpm.
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Old 10-08-2005, 03:40   #7 (permalink)
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Re: G-tech timers & AU2 XR8 ute times

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Originally Posted by TruBlu351
Take your cars to a weight station and get it weighed (with you in it and note how much fuel in tank). Then enter that on your g-tech. It will be much more accurate then.

My g-tech was about 0.1 to 0.4 sec slower than my actual quarter times. I'd run them side by side and compare.

Remember, a GOOD ET is all about the launch ans no wheel spin. You'll note that your MPH each time is almost the same. Spin your wheels a fraction and you'll lose HEAPS of time.

Try riding your clutch a little 'till she gets off the line or launch with lower rpm.
I did take mine to a weight station and with half tank of fuel and myself came to 1820 kilos which worked out to about 4000 lb or thereabouts, so i cant figure where the 369 hp reading comes from?
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Old 10-08-2005, 05:13   #8 (permalink)
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Re: G-tech timers & AU2 XR8 ute times

How secure is your bracket? If it wobbles around and tilts down it could meaure some gravity and think its your car accelerating which will fatten up your numbers.

As mentioned if you do it down hill, it'll accelerate faster too giving a bigger number.

Try 5 or 6 runs and get an average.
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Old 10-08-2005, 07:50   #9 (permalink)
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Re: G-tech timers & AU2 XR8 ute times

OK, just got back from some runs, these are the average figures i managed,
bearing in mind I had my mate who weighs 118kg in the passenger seat, a quarter tank of fuel, not much tyre left and a pretty cold night with a bit of drizzle in the air;
0-60 mph average of 4 runs 7.16 secs, best launch was 3000 revs holding it on the handbrake pretty hard about half a turn of wheelspin and no bogging down.
Also got a better HP figure of 165, guessed a weight of around 1900 kg.
60-0 braking was 145 feet.
So all in all I think is a pretty accurate device.
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Old 10-08-2005, 17:26   #10 (permalink)
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Re: G-tech timers & AU2 XR8 ute times

Yeah, that sounds quite good now. Sometimes you can get some freak results, so averages work great. Now for some new tyres!!
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