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Location:
Lost in the K hole
Registered:
May 2002
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Re: Gtech question.
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Tue, 20 January 2004 05:24
 
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ok...
i 'get the question'...
theoretically your engine should make 'x' amount of power at 'y' rpm point in whatever gear youre in.
this power (regardless of gearing) will produce 'z' acceleration of a car of a given weight (which you enter).
it doesnt matter what gear youre in as the gtech will calculate the change in accel in time (which will be high in low gears, and low in tall gears)... but its all very simple maths to work out.
(this is in contrast to rollers on a chasis dyno, that take a direct measurement off the wheels, and require a 1:1 ratio through the box to see what is happening at the engine)
HOWEVER: errors are what will distort you readings...
... in low gears you have a very small time scale in which to recard changes in accel. which can make the fidelity of data a bit rough
... in tall gears, the accuracy is improved as the time scale is lengthened, however, rate of accel decreases, and changes may be harder to quantify
... plus in taller gears, youre going faster, and losing more and more power to wind resistance
compromise, do a 2nd gear run to redline. that way you have about 10secs of recording, the rate of change of accel is decent, plus terminal speed wont go much over 100kmh, so drag wont kick you in the ass to much
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| | Subject | Poster | Date |
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Gtech question.
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DiZ_ | Mon, 19 January 2004 07:58 |
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Re: Gtech question.
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oldcorollas | Tue, 20 January 2004 02:21 |
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Re: Gtech question.
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DiZ_ | Tue, 20 January 2004 03:47 |
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Re: Gtech question.
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Chris Davey | Tue, 20 January 2004 03:58 |
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Re: Gtech question.
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FKN16V | Tue, 20 January 2004 04:03 |
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Re: Gtech question.
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CrUZsida | Tue, 20 January 2004 04:49 |
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Re: Gtech question.
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oldcorollas | Tue, 20 January 2004 04:54 |
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Re: Gtech question.
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ed_ma61 | Tue, 20 January 2004 05:24 |
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Re: Gtech question.
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DiZ_ | Tue, 20 January 2004 05:32 |
