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The mkiv Supra Owners Club

G Tech


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How does this work then?

 

"All you have to do is plug it in a cigarette lighter, mount it to the windshield and start accelerating."

 

"At the heart of the Gtech Pro is a precision silicon accelerometer. An accelerometer is a sensor that measures acceleration, also known as G-Force. "

 

So you just give it power and it monitors your engine perfomrance? am I missing something here? precision silicon accelerometer? eh? Surely it doesn't work on motion?

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Well if it works on motion, surely the suspension of the car, and/or the way it's driven would come into play? the softer the suspension the less motion it would get? either that or it's inherently 'not very accurate'..?

 

How can it be accurate if it doesn't talk to your engine?

 

It is a gimmick isn't it?

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No mate, you misunderstand, most accelerometers record g-force in all planes so can measure acceleration (duh!) VERY accurately. The direct acceleration measurements (0-60, 0-100, 1/4 mile, etc) are highly accurate, its the 'bhp' figure that some give that should be taken with a bucket of salt. It needs car mass, rolling resistance, etc to even give an approx result...

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Lots on info on the web as to how these work....no point regurgitating all the details here.

 

Basically if you are tuning your car, then a device like this would tell you whether your car is performing better or worse than before.

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Don't know how accurate the GForce is, but my accellerometer is very accurate.

you can do 0-60, 40-100, 1/4mile, standing km etc and get very accurate and repeatable figures.

 

you can also get max hp at the wheel during each run, as well as max G-force etc. For hp figures you need to do some extra measurements on a flat surface to calculate the rolling resistance and aerodynamic resistance. You also need total weight of course.

 

Very useful if you want to see whether your 'mods' have actually made the car any faster.

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Indeed.

 

You need to have access to an 'available' stretch of straight, flat road though.

 

You also get just max power figures, not a torque curve like with a dyno.

 

Airflow through the radiators and engine bay is 100% realistic, and engine load is 100% compared to a dyno.

 

On the negative side, it is only viable on dry days, and you have to do ambient temp adjustments yourself.

But it's practically free once you start using the gizmo, and it waaaay more accurate than the 'seat of pants' dyno.

Which is pants.

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John, which product are you using? How did you manage to find the rolling resistance for the Supra, is it something you calculated yourself?

 

I'd like to use the bhp figure on my ap-22 but have never been able to find which figures to enter.

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