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Throttle Guage Sensor Answered

Im trying to figure out how to guage how much throttle im applieing in my car. I want to have a set of lights or even just an analog guage that tells me for example that i am using 25% of my throttle. I was thinking of putting some sort of pressure switch under the gas pedal, but Im stuck on where to start. Thanks, Newman

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Newman180
Newman180

12 years ago

It was just a thought that came to me. Sometimes with my truck I dont know how far the brakes are pressed and I want to know how close to the lock I am. Gas pedal would be something for mpg... For example, if you go over 20% throttle, you know ur mpg will be 17 instead of 18

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Goodhart
Goodhart

Reply 12 years ago

That wouldn't depend as much on how far the gas pedal was down, because, depending on the gear one is in, it may be the most efficient for the speed. This would have to take into account, engine RPM too, for the purpose of gas mileage calculations.

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NachoMahma
NachoMahma

Reply 12 years ago

. It wouldn't give him an MPG reading, directly, but there is a reasonably good correlation (ie, ballpark) between throttle position and MPG. I can see where this would be valuable for someone who is trying to get max MPG, especially if they are having problems keeping their foot steady.

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Goodhart
Goodhart

Reply 12 years ago

Hmm, ok no argument there. As far as the "practice on braking", if you live in an area with "icy/snowy" winters, find a parking lot that is pretty much empty with ice and snow in it, and practice "locking one's brakes and steering techniques". Recently, I am glad I did a lot of that when younger, as someone pulled out in front of me, out of seemingly no where; first reaction: stand on the brakes, then turn the wheel. In 2 seconds I would have rammed his side, because #1: with the brakes locked, you lose all steering and #2: the distance was too short to get stopped in. In an instant, I recognized what was happening, and "took my foot OFF the brake" so I would get my steering back, applied the brakes more gently while steering off the road into a near by parking lot (saving the man's life, as I would have split him in two at the driver's side door). In panic situations, a sensor will not help you much. So I agree with NM on this for sure. A lot of practice (I used snow and ice where I couldn't hurt anyone or anything because it was less wearing on the tires and brakes).

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NachoMahma
NachoMahma

Reply 12 years ago

. For brake pedal travel, I'd try a linear sensor mounted to the upper part of the brake pedal lever. . But instead of doing that, I'd suggest a few hours of practicing "panic stops" in a remote area. That way your body/brain will be able to feel when the brakes are getting close to locking up. Kinda hard to keep your eyes on the gauge when the back of that semi is starting to fill your field of view. :)

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Andrew546
Andrew546

12 years ago

whats the motivation for this idea? Like lemonie said, couldn't you just listen ot he engine or feel for vibrations, or look at the tachometer?

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lemonie
lemonie

12 years ago

I would advise that you use your existing senses: i.e. what the engine sounds like, vibration, and how close your foot is to the floor. Or are you taliking about some kind of rev-counter that prompts you to change up/down? L

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NachoMahma
NachoMahma

12 years ago

. You can use a rotary sensor (eg, potentiometer) on the shaft of the butterfly valve (where it's located will depend on whether you have a carb or FI and the car). . Most modern cars have a throttle position sensor that is hooked to the engine management computer. Maybe you can tap into that.

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Newman180
Newman180

Reply 12 years ago

Thanks for the response... My biggest issue is how to then connect that rotary sensor to just say three lights, one at 0 % one at 50 and one at 100%....

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NachoMahma
NachoMahma

Reply 12 years ago

. I'd just get a matched potentiometer and (milli)ammeter (a la, water temp or oil pressure gage). Much simpler than a comparator circuit and will tell you exactly (or as close as you have it calibrated) what position you are in.

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Newman180
Newman180

Reply 12 years ago

thanks, ill look into it.

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NachoMahma
NachoMahma

Reply 12 years ago

. Oh! If you just want a few lights, then something like the rotary source selector switch on a home stereo might work.

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Patrick Pending
Patrick Pending

12 years ago

Do you need this gauge because you have a disability? Cheers, Pat. Pending