Understanding and setting up the MPGunio

[mluckham]

I modified my version to save the Tank values if the vehicle has stopped for awhile, that way I've been able to take it out - reprogram - put it back in the car, and the Tank values are still there.

Also I'm trying a different calibration method in the software - so far not as accurate, but easier. When you fill the tank you write down the odometer distance and amount of fuel - then go into the configuration screens - they tell you Distance and Fuel amounts, if the actual amounts are different you input those values - the software recalculates the pulse counts itself. I'm thinking of putting this function as part of the Tank Reset, instead of in the configuration screens.

The reason for inaccuracy ... not enough digits of accuracy in the display, as compared to your calculator and using the raw VSS and uSec-per-fuel-unit values.

[Area51]

Originally Posted by racprops

OK Got it locked down now.

OUCH Spoke too soon...

Switch to the Tank Big MPG readout and was driving and she locked up again.

I will now add a blocking diado and filter cap to the incoming 12 Volts.

The meter seems very senstive to voltage bumps.

Two things: a manual would be a big help, seems the trip miles reset with each turn on.

Which is what I am trying to do here, cover details as I learn them and pass them along.

The Tank miles are suppost to stay.

I had mine hooked up to a constant on 12 B+ on a relay I added to power up some add on gauges.

I am guessing there was some little backwards EMF coming off that relay.

Perhaps a little filtering to make them less sentive??

So I hard wired it driecly from the battery, same for the ground, it has not messed up for a couple of weeks.

So looks good.

So anyone done any thing with a TBI Motor like a Chevy 350 TBI??

Rich

I will be trying it on a TBI Chevy as soon as I get it, just ordered it today. Have a 305 and 350 both

[racprops]

VERY IMPORTANT:

I still had a small touch of resetting, so with the advice of a electronic expert, I added a 100 MFD Cap across the power leads and I added a diode on the power in line, you cut the line and put the diode in line.

This stops all the EMF and backwards voltage that can happen in a car.

It has now held it tank records for 3/4 a tank, 269 miles...and mant stops and starts.

Rich

[91 Buick Roadmaster Wagon]

Originally Posted by Area51

I will be trying it on a TBI Chevy as soon as I get it, just ordered it today. Have a 305 and 350 both

Have you installed the mpguino on your chevy v8 engines yet?

[racprops]

Not yet been too busy.

Hope to do so soon.

Let me know how yours works out.

Rich

[Area51]

Originally Posted by 91 Buick Roadmaster Wagon

Have you installed the mpguino on your chevy v8 engines yet?

No I haven't, the weather has been very cold here and I don't have a shop. Hopefully it will get nicer here soon.

[ECONORAM]

Originally Posted by racprops

VERY IMPORTANT:

I still had a small touch of resetting, so with the advice of a electronic expert, I added a 100 MFD Cap across the power leads and I added a diode on the power in line, you cut the line and put the diode in line.

This stops all the EMF and backwards voltage that can happen in a car.

It has now held it tank records for 3/4 a tank, 269 miles...and mant stops and starts.

Rich

Now THAT is a good idea. I am about to order one of these, as I found values for VSS for my Dodge RAM. Still need to fiigure out the fuel use, but I am partly there. I am guessing you got this at Radio Shack? Thanks, Dave

[racprops]

Yes.

And it is still work AOK.

Rich