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Old 07-28-2015, 03:33 AM   #1 (permalink)
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Gas Pedal Depression Gauge?

With the engine running, you can't use any less gas than an idle. I'd like to know how far I'm pressing the gas pedal compared to not pressin at all. Is there such a gauge? BTW, I have a 1989 car with NO OBDI.

Thanks!
Doug in Oakland, California

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Old 07-28-2015, 05:41 AM   #2 (permalink)
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It's been asked before. If you have a throttle position sensor that generates a voltage that varies with throttle position you can do this:

http://ecomodder.com/forum/showthrea...uit-14262.html
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Old 07-28-2015, 08:10 AM   #3 (permalink)
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MAP (manifold absolute pressure) which is the inverse of manifold vacuum is much more relevant to driving with the correct load, since load and not throttle position determine consumption.

Just use a vacuum gauge.

regards
mech
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Old 07-28-2015, 09:55 AM   #4 (permalink)
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I'd have to completely agree with Old Mech.
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Old 07-28-2015, 11:04 AM   #5 (permalink)
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Mounting one of these on the dash and running a Bowden cable to it from the pedal would kick ass. Screw computers and inferring data from other events. This'd be a real throttle position sensor!

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Old 07-28-2015, 09:10 PM   #6 (permalink)
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on my tdi you can programme the max fuelling at several given pedal angles

if you could work out how much pedal angle equates to each % of throttle pedal travel you could be fairly accurate with it all

see here for a fuller explanation:
http://ecomodder.com/forum/showthrea...ite-32353.html
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Old 07-29-2015, 03:35 AM   #7 (permalink)
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I built a gauge that shows me 0-100 depending on my throttle position. It takes a minimum value from tps sensor and max value and scales it 0-100, the accuracy is about +-2%. I use it on my truck and my bike. Easy 3 wire hook up, switching power source, ground, and tps output.
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Old 07-29-2015, 03:46 PM   #8 (permalink)
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Get a vacuum gauge and call it a day. No need to reinvent the wheel.
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Old 08-27-2015, 07:59 PM   #9 (permalink)
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Quote:
Originally Posted by ChewChewTrain View Post
With the engine running, you can't use any less gas than an idle. I'd like to know how far I'm pressing the gas pedal compared to not pressin at all. Is there such a gauge? BTW, I have a 1989 car with NO OBDI.

Thanks!
Doug in Oakland, California
Doug, you appear to have made a faulty assumption about gas consumption being linear to throttle position.

Get a vacuum gauge and mount it where you can see it without being distracted from driving. It will have a single port on the back and you will want to run an 1/8" vacuum line (vacuum line has a heavy wall so it doesn't collapse) to the intake manifold and tee off an existing vacuum port. You'll want to find one that is down stream of the throttle blades.

When you drive, try to keep the needle as high as possible. It will be quite a challenge but will lead you to more economically driving techniques.

The gauge will pay for itself but you'll probably find that driving economically will not make you popular with commuters that are in a hurry.

Last edited by RunningOnEmpty; 08-27-2015 at 08:00 PM.. Reason: spelling
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Old 08-28-2015, 09:37 AM   #10 (permalink)
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Quote:
Originally Posted by RunningOnEmpty View Post
The gauge will pay for itself but you'll probably find that driving economically will not make you popular with commuters that are in a hurry.
To hell with their popularity: embracing the suck doesn't mean doing everything you can to make it suck more.

After you drive economically for a while you'll discover that you still get where you're going at about the same time. It follows that "being in a hurry" is more about living the stress than actually getting somewhere more quickly. I can't help them get there sooner, all I can do be amused at their stupid and unconstructive reactions to unnecessary stress.

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Originally Posted by sheepdog44 View Post
Transmission type Efficiency
Manual neutral engine off.100% @MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%

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