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 Post subject: Re: DIY MPG Gauge
PostPosted: Sat Jul 05, 2008 2:04 am 
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bbjsw10 wrote:
How old of laptop will still work for this? My dad has a old one laying at his house in closet. I am guessing it has to be newer than his to run java.
Mpmetro how accurate was it?


it should work on any old laptop with a stereo input jack (mic or input, but some mic inputs are mono only) There are complicated ways around to making java run on older machines, but it should be atleast be able to run windows 98 and up.
I am am unsure of the accuracy, since I didnt use it for too long, (i got bored with the project, and didnt feel like carrying a laptop with me in the car)

I dont think it is accurate when it comes to throttle , vacuum, and fuel pressure, which does have some affect on mpg. This only calculates an mpg from the speed of the car, and how many times the injector fires.

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 Post subject: Re: DIY MPG Gauge
PostPosted: Sat Jul 05, 2008 12:36 pm 
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Joined: Sat Jul 05, 2008 12:29 pm
Posts: 1
Location: FL USA
Ok question. You tapped the signal wire on one FI. What is the voltage of that FI.

I hooked this up in a blazer.

What connections are made to the stereo plug?

VSS tip?
FIS Side?

When driving the VSS says 180mph+ I wish ;-)

The MPG Instant say 4mpg but when stop or in park it is 50+mph?

What does your FI sensor read. Mine voltage decreases on acceleration. It also use the ground to fluctuate the FI. Power is always on and it seems to use an adjustable resistance/ground for controlling the FI.


Thanks for the help.


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 Post subject: Re: DIY MPG Gauge
PostPosted: Sat Jul 05, 2008 10:08 pm 
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Location: Rivendell
OK to state the obvious, OK on a tbi model but what about multipoint injection? pick the signal off of a single injector? calibrate by a factor of four?

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 Post subject: Re: DIY MPG Gauge
PostPosted: Tue Jul 15, 2008 11:33 pm 
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Location: Findlay,OH
Here is another DIY MPG gauge on eco-modders. No laptop to tote around!! http://ecomodder.com/forum/showthread.p ... -2115.html

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PostPosted: Sun Aug 17, 2008 5:56 pm 
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Joined: Sun Aug 17, 2008 5:40 pm
Posts: 11
Location: Chatham Co., NC / USA
Hi!
I just joined this site...and in browsing around, I came across this thread.
Many of us (most?) who drive / want a MPG gauge but don't "speak the language" of electronics ... Jimmy Clark was a sheep rancher ... have a good way out of this dilemma : Buy a ScanGauge! It's a little pricy, but seems sound and bulletproof.
Go to <www.scanguage.com> for details. I've just gotten one, and am tickled with it! -Ted

P.S. While the "edit" button is still hot, let me just say - I went to the "gallery of pics" thread, just to check it out. When I saw the pic of the "Leaf blower", I went ROTFLMAO! When I looked again, I thought ... "Gas or electric?" LOL!


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 Post subject: Re: DIY MPG Gauge
PostPosted: Sun Aug 17, 2008 6:45 pm 
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Location: Chatham Co., NC / USA
bbjsw10 wrote:


Your windscreen will just LOVE you when the semi you're drafting kicks up that rock ! -Ted


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 Post subject: Re: DIY MPG Gauge
PostPosted: Sun Aug 17, 2008 9:12 pm 
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Location: Findlay,OH
chembustion wrote:
bbjsw10 wrote:


Your windscreen will just LOVE you when the semi you're drafting kicks up that rock ! -Ted

I don't draft that close maybe 150 ft back. My vacuum gauge shows when I am in draft. I didn't say a semi to tailgate.

chembustion wrote:
Hi!
Buy a ScanGauge! It's a little pricy, but seems sound and bulletproof.

Scangauge is only for 96+ vehicle that is the reason for a DIY one for 96- vehicles.

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 Post subject: Re: DIY MPG Gauge
PostPosted: Sat Oct 25, 2008 11:55 pm 
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Joined: Wed Mar 26, 2008 11:56 pm
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Location: Dallas, TX
Hey mpmetro what Diodes did you use? I know the resistors are 10k but what are the diodes?


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 Post subject: Re: DIY MPG Gauge
PostPosted: Wed Sep 22, 2010 3:49 pm 
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Posts: 53
Location: Springfield, Oregon
I would suggest that you use 4n25 opto-isolators in the line to your sound card. That would prevent any change of putting 12v on the line in leads (although it might not hurt it anyway).

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 Post subject: Re: DIY MPG Gauge
PostPosted: Tue Oct 12, 2010 3:45 pm 
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Location: Brinkworth, UK
bbjsw10 wrote:
Scangauge is only for 96+ vehicle that is the reason for a DIY one for 96- vehicles.


My Rhinoview software for OBD1 Suzuki vehicles displays mpg. No need to hack the wiring about if there is a diagnostic port available.

http://www.rhinopower.org/Rhinoview/Rhinoview.html


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 Post subject: Re: DIY MPG Gauge
PostPosted: Sun Apr 29, 2012 9:13 am 
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Location: columbus, ohio
jelly bean driver builds really nice mpguino stand alone mpg displays for around $40.

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