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Old 05-13-2013, 04:28 PM   #61 (permalink)
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stewie:
I tried your #'s out and they are indeed way out on my car.
The #'s I use are 7999 0258562433 and they seem pretty close for the last few tanks now.
edit:
I just tried 8001 0258562433 and came out within -0.0100 so thats where I will stay ..

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Old 05-16-2013, 07:17 PM   #62 (permalink)
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wd40 thanks dude. That's right on for you man. I would stay with that. You don't need any closer then that. the offset -0.0100 you referring is to total miles traveled or total tank mpg??? BTW my usec seem like it will be good, maybe 1%-1.5% for mpgs off so i may come up with number close to yours. My last mpgs were 48.60 and i'm getting now 48.90 but it got hot here so my mpgs will go up so i will only be able to tell at final tank comparing but not yet. I do not however know if my VSSPM is correct for long distances. For short distances it seems 8087 is bulls eye for me. I get almost exact to offset of x.x2 match to GPS miles. 88 throws the number off so i will stick with 8087 until tanking then compare both miles and mpgs and adjust if need by margin of error. Honestly i may come up number closer to your usec 25 number like yours but your car is getting higher mpgs due to mods so like i said, everyone needs to tune their mpguino to their car even if stock. Please let me know later if that's a bulls eye for you later on so i know.

P.S
I noticed instant mpgs are pretty much useless. It shows number that do not really help you but current mpgs are very helpfull as those are current trip mpgs and if you consistently hit over 50mpgs your tank should be very close to that number and of course we have tank mpgs so boom..tha'ts good but i find instant to be completely useless. Not sure how anyone can use that s guide unless cruising on highway with constant speed

Last edited by stewie; 05-16-2013 at 07:22 PM..
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Old 05-21-2013, 01:19 AM   #63 (permalink)
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great, now I have to rethink my settings after reading this. I knew my numbers were a little off....I bet they are really off
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Old 05-26-2013, 08:57 PM   #64 (permalink)
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stewie:
I just did an almost 500 mile fill-up and my mpguino's #'s are so very close for both speed, distance and mpg.
All are within 0.02 so I think I'm happy enough with my setup.
How's your setup going?
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Old 05-27-2013, 04:22 AM   #65 (permalink)
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Quote:
Originally Posted by WD40 View Post
stewie:
I just did an almost 500 mile fill-up and my mpguino's #'s are so very close for both speed, distance and mpg.
All are within 0.02 so I think I'm happy enough with my setup.
How's your setup going?
Congrats!
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Old 05-27-2013, 03:38 PM   #66 (permalink)
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WD40 Congrats bro. My VX went down with distributor failure so i didn't get a chance to finish up the tank. I ordered one and should be getting it within days now. I'll let you know once i empty out the tank. Thanks for update bro. I'm assuming you're using the numbers you posted earlier.
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Old 12-20-2014, 03:07 PM   #67 (permalink)
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So what was your final settings that work best for your VX?
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Old 12-20-2014, 04:53 PM   #68 (permalink)
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Brickhouse i sent you PM. My settings are as good as it will get for my car. I could never get Mpguino to show correct mpgs as mpguino is missing coolant temperature for calculations it will do. It's rough guide but after all frustration i got annoyed with it and quit it. BTW i have also shorted it by accident so it's now gone. Unless i can get good deal on it i won't bother. I was too frustrated with it and i spent too much time watching it. I drive better also without it as well which is unusual. Post some pics of your new VX and congrats on purchase bud.
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Old 12-20-2014, 10:01 PM   #69 (permalink)
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MPGuino with old diesel

Quote:
Originally Posted by AndrzejM View Post
Hi, I'm using Canadian metric version but it's similar so I'll answer you with my best knowledge.

Timeout = time before MPGuino goes to sleep and it resets current trip counters
Injector delay = time that guino waits before it stop counting time of injector open state. (after current is turned off on the inj it stays open for a while and inj delay is that while)
Scratchpad = not used in v0.86 (as I remember)
VSS delay - time that guino waits before it can read another vss signal
Inj Trigger - If you're reading +12V or ground signal

Current is an average reading from the current trip, instant is a reading in the given moment.
Hello Adrzej! So much time, hope you are doing very well.

Well, I have my MPGuino and want to install it in my old Mercedes diesel. My plan is to use VSS it has and RPM signal, in replacement of injector signal. At least number of injection strokes will be right. Duration will be always the same, maybe, I am not sure.

Anyway, I will try it and will let you know what happen.

I have one very basic question for you and all the Forum: what is expected to happen the very first time I connect MPGuino?

From what I remember I read somewhere (but that I cannot find now), the computer will ask for some parameters or, I shouls enter some parameters.

However, I haven't seen anywhere how to input VSS constant or any other constant, at the very starting. I am clear where to get the signals, and I know there is a necessary callibration, but there should be a "first display".
Do you know where are the instructions of the device? Unfortunately, I forgot where I bought it (it is one of the earliest versions, only for british units).

Hope you or any other member of the Forum can help me with this.

Do you know if any other member tried to input VSS and RPM ?

Best,

Oldbeaver
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Old 12-23-2014, 08:31 PM   #70 (permalink)
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How to calculate Pulses per mile.

Ok which of the following is the correct way to calc Pulse/Mile?
As you can see the answers are vastly different.

Method1:
To determine the number of pulses per km the ECU requires in the speed sensor calibration field, we first need the number of teeth that our trigger wheel, transmission, wheel hub teeth, etc., has. For this example, we'll keep things simple, we'll pretend we've got a wheel sensor with 16 teeth around it.

We also need to determine the circumference of our tire, in order to know how many pulses per km the sensor will read. So, on this example, lets make it a 22.7" tire diameter (as per Tire Rack for Michelin Defender 175/70/13).

Our formula for calculating the pulses per km can be summed up like this:

P/Km = 1000 (meters in 1km) / [ (pi * diameter) / # of teeth on sensor ]

So, in this example with our 22.7" tire we must convert 22.7" to meters to keep things in the same unit system (metric), so multiply inches by .0254 to get meters.

P/Km = 1000m / [ (3.1415 * .57658m) / 16 ]
P/Km = 1000 / 0.113208
P/Km = 8833.298 <<<< This is the number you will put in your pulses per km field in the Calibration tab for the vehicle speed sensor.

Method2:

(Tire revolutions per mile) * (axle Ratio) *( number of teeth in speedometer gear)= PPM
Example: Michelin Defenders(175/70/13) 917 revolutions per mile
x 3.250 (final gear ratio for VX ??)
x 16 teeth in speedo gear as seen in Manual drawing.

==> 917*3.250*16= 47,684


Last edited by BrickHouseVX; 12-23-2014 at 08:38 PM.. Reason: clarify
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