What do you monitor with your ScanGauge? - Page 2 - Fuelly Forums

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Old 08-11-2007, 07:54 AM   #11
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For the most part its:

GPH IAT
MPG FWT

Sometimes I swap out the GPH for TPS when I'm watching up hill climbs (make that up bridge since there are no hills here) but lately I just watch the MPG for that and try to hold the FE numbers as high as possible without dropping to much speed.
I started watching the GPH when I was trying to determine if I had a fuel cut system for coasting. Turns out I don't and whats worse is it seems that down hill runs create enough air moving through the radiator to spin up my fan clutch driven fan resulting in the engine idling a couple hundred RPM's higher using more GPH in the process. When I get my E-Fan installed this problem should be solved though.

The FWT is my biggest issue on my daily commute as it takes way to many miles for my FE numbers to get up to normal. Again the E-Fan should help this and perhaps some additional grill block after I see how the E-Fan performs.
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Old 08-11-2007, 10:19 PM   #12
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Interesting. Nobody else monitors spark advance.

MPG - obvious
TPS - I know what TPS is needed to get what MPH, so I accelerate gently to speed then back of throttle to correct TPS for desired speed
IAT - that will determine how much fuel is injected to match air at that temp
IGN - higher number means more spark advance and better MPG


MPG TPS
IAT IGN
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Old 08-11-2007, 11:22 PM   #13
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TPS/LOD
MPG/LP

I'm surprised nobody else is using load? I use it to know when to coast. Holding any given RPM in neutral makes the LOD show 27 in my car (while the TPS varies with RPM) so I know that if I am cruising and the LOD is showing 27 or less I can EOC without loosing any speed.

I use LP to know when my car goes into injector cutoff while coasting in gear. This has changed my downshifting strategy while slowing significantly. In 4th or 5th gear my car with stay in fuel-cutoff down to about 1000 RPM but in lower gears it will start spraying the injectors at about 1500 RPM.

I used to use both IGN and GPH but I didn't find GPH very helpful because I constantly had to be checking it against speed to know if it was relevant, and so I might as well just use MPG. IGN was cool, but not as helpful as any of the 4 I am using now so it got the boot. Now that I am getting used to it I probably don't need LP any more and I may put IGN back into the mix.
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Old 08-12-2007, 06:06 AM   #14
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another recent thread on this topic.
http://www.gassavers.org/showthread....ight=scangauge
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Old 08-12-2007, 06:10 AM   #15
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Quote:
Originally Posted by cheapybob View Post
Interesting. Nobody else monitors spark advance.

MPG - obvious
TPS - I know what TPS is needed to get what MPH, so I accelerate gently to speed then back of throttle to correct TPS for desired speed
IAT - that will determine how much fuel is injected to match air at that temp
IGN - higher number means more spark advance and better MPG


MPG TPS
IAT IGN
I've watched IGN a few times and its always on the move even while using the cruse on level ground. Almost seems like the ECU is always adjusting this using the knock sensors or whatever.
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Old 08-12-2007, 06:28 AM   #16
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Rpm / Iat
Mpg / Wt
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Old 08-12-2007, 08:35 AM   #17
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MPG GPH
? TPS

? represents whatever I'm curious about at the moment.
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Old 08-12-2007, 10:13 AM   #18
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TPS = Throttle Position Sensor, measures percentage of full throttle. for example, at TPS 9 in 5th gear, on level ground the car will go about 50 or 51 mph, at TPS 10, its about 55 or 56 mph. I usually try to keep TPS under 23 when accelerating, then let up to the correct value for speed desired when I reach that speed.

In other words it tells me how hard I'm pressing on the gas, and allows me to minimize any wasteful over acceleration.
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Old 09-02-2007, 03:06 AM   #19
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Quote:
Originally Posted by Bennet Pullen View Post
TPS/LOD MPG/LP

I'm surprised nobody else is using load? I use it to know when to coast. Holding any given RPM in neutral makes the LOD show 27 in my car (while the TPS varies with RPM) so I know that if I am cruising and the LOD is showing 27 or less I can EOC without loosing any speed.

Is LOD calculated by dividing TPS by RPM?

So LOD is the amount of throttle relative to the rpm?

For the same TPS number...a higher RPM = lower LOD number?

Lower LOD numbers correlate with more closed loop operation?
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Old 09-03-2007, 04:31 PM   #20
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LPH LHK
XYZ LOD

alternatively
GPH MPG
MPH LOD
when I get overloading reading MPG figures in here... ;-)

where XYZ could be cIA, cWT, KPH, TPS,
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