HELP< Electronic/computer help needed MPG related
 

OK Here is my problem.

The MPGUnio is great BUT as it takes it read out from the ECU side of the injector, it cannot see the changes I am working on.

I have a system that lets me control the injectors duty cycle.

Neither the MPGUnio nor the Scan gauge II can give me a real time readout of fuel used and MPG.

I have a fix for this IF I can get some help.

The old Zemco MPG Computer.

It uses a fuel flow meter system and its own speed/distance readout sensors.

BUT:

Most cars use a fuel return line.

So this system will gladly show me how much fuel flows though the system and right back to the tank.

So I think, use two flow meters, one in and one out.

Subtract the out flow count from the incoming count and you have the amount taken/used by the injectors.

The output needs to match the single flow meter’s system of a low count of negative going pulses.

I am so close to a real fuel saving system that controls the injectors but 100 miles test runs are hard to do.

I need a real time readout so I can see how much I can save and when I can either go farther or have gone too far and am hurting MPG with stumble and misfiring.

Can anyone help??

Rich racprops@cox.net

This got crossposted somehow, but the mpguino keeps track of injector open (and closed) time, which is essentially duty cycle. It isn't connected to the ECU at all.

Sorry I put it in the best places hoping to get help.

AND sorry the MPGunio works off the ground side of the injector and thus reads how long the ECU holds the grown down and thus reads off the ECU.

NOW IF you change that it will still read the ECUs call for ground and thus not see that I have short cycled the injector.

Rich

the problem with crossposting is now we are having the same conversation twice.

without a schematic of what you are attempting I cannot say what will or wont work. There are likely ways to modify the duty cycle that do not interfere with the monitoring of duty cycle however.

I can not give out what I am doing other to say it is like cutting the b+ line with a synic contoled system thet short cycles the on time of the injector.

SO I am not changing the ECU nor its cycle time.

So can anyone build a computer to compair/subtract two counters and to output the differance??

Feel free to remove the other post or theone you feel is in the wrong place.

Rich

?!? I don't know how to help you if you are going to be secretive. Hope that works out for you.

What I am doing to the injectors has nothing to do with what I asked help with.

Now if I was asking for help WITH my Injector controler, that would be another story.

I am asking for help rigging up a pair of flow meters and subtracting the two counts from each another to get a corrected count to give MPG with aold zemco MPG Computer or perhaps to feed to a MPGunio...

Then I can see if my injector control can be made to work.

I do not plan of letting others get a head with my idea.

So if you will only help if I give away my idea, well I will not come back here again.

Rich

the problem is this is a forum for sharing ideas. Indeed you are asking for others ideas without subjecting your own to daylight. "Help me, but first guess what I am thinking"

modifying pulse width has been done a number of ways, most reliable seems to be by modifying the o2 sensor signal, which tricks the ecu into a leaner mixture. If you force the injector pulse width to a different length, the system WILL attempt to compensate, as is.