I just got the 'AM' version of $32B from TC this morning and saw something new. "Display Injector Fuel Rate" and it has a value of 3.81 gal/hour in my BIN that has 24.0# injectors set.

If I use the weight of gas to be ~6.25 pounds per gallon then this almost equals out.

24 / 6.25 = 3.84 gal/hour

Does anybody know what this field is used for? Thanks.

 

Digital dash display of MPG.

RBob.

 

Very interesting thank you. So will bumping this up by the proper percentage to match my fuel injector constants in theory correct the miscalcuations it has had ever since going with my SVO 24# injectors?

 

From what I can tell, yes, it will adjust the MPG calculation. Just need to remember that I don't have a car/ECM to try this out on. I am just going by the code in the ECM. Let us know how it works out.

RBob.

 

Is this the same as Injector Flow Rate that I find in the AUJP8D bin file?

Am I correct then in that mileage would be calculated like this:
Is that really all there is to it? Doesn't RPM factor in?

 

I want one.

 

My 350 gets 17-18mpg for highway driving and the like.

But I don't think this is correct because if speed is decreased then mileage goes down, thats not really true all the time, neither should mileage automatically become higher at higher speeds because that means higher RPM's as well.

EDIT:
I am sure I am not doing this right because according to Rrob in another thread, bytes 49, 50 & 51 in the ALDL datastream are used for MPG calculation, I am not sure how the injector flow rate factors in here.

I lack basic info here and I have not been able tofind it on the net or on these forums.


This I have found out:
49 = Total Fuel Delivered (MSB)
50 = Total Fuel Delivered (LSB)
51 = Total Distance (.0005 miles/bit)

So, what does a fuel count in 49 and 50 stand for?
What is the difference between MSB and LSB? Are both used(separate values or combined into a new one) or just one?

Going on an old log of mine from datamaster I got this:
99,495 counts(or seconds, I am not sure how datamaster formatted the raw aldl data) @ 5,21375 miles

Now if I merely divide the first by the second I get ~19, which I suppose could be a MPG figure.

 

OK, I've been thinking really hard about this and I think I got the MSB and LSB thing down, it's combined into one 16 bit value wich can then be converted into seconds.

Regular gasoline should be 6,216lbs per gallon according to what I've read so thats 2,82kg per gallon which then becomes 0,745kg per liter.

With this I can use 10kg / 0,745 to get the amount of liters per hour = 13,4 liters/h.

so 13,4l/h turns into 0,00372l per second @ 99,495 seconds = 0,37 liters used for driving 8,39 kilometers.

I do not trust this info at all, it'd only take 37 liters to drive 839 miles, thats 4,4 liters per 100km, my parents Mazda only does 6, this is equivalent to 53 miles per gallon by the way!

But I think the math and procedure is sound, it's my input numbers that are incorrect, either my ALDL port(well interface, got one of those box things, gonna build my own later) is screwy which is very likely or my PROM is on the fritz.

Anyone with a '730 ECM care to donate a normal datalog? ALDLMon or Datamaster would be nice.