Me78569

well I am getting it dialed in. I think I am close. My trip into work this morning is 8.9 miles mostly 40 mph with a few stops. If I just DD my truck to work and back I average 15ish mpg so 9 miles / 15 mpg = .6 gallons burnt. I think the quad was saying I burnt .65 or something. I have since adjust my offset down from %155 to %140 as my instant mpg was a few mpg low for a stretch of 55 mph.

Have you tried jumping the starter relay from another power source? Get a multimeter setup to measure if there is an amp draw when the truck is off.

when it works does it crank at the same speed as when it doesn't work?

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One thing I am curious about is if the relationship between fuel into the engine vs the fuel return out of the back of the head. Is that a 1:1 relationship between the duration command and how much actually gets injected? in theory it should be because the injectors are not smart enough to control flow. I would guess that the bigger the injector the less fuel is pushed out hte back of the head at a given duration. I am guessing, wildly, that this is where that 125mm^3 of fuel comes from. The injectors are passing that amount but the remaining ~350 mm^3 of fuel the vp can supply is pushed out the back of the head.

the relationship of fuel burned is static compared canbus regardless to the timing command As you get better mpg, related to timing changes, the canbus message will drop, but is still related to the canbus 1:1 I have the instant mpg working well, now I am workign on a gallons burned calc.

The MPG info is directly related to the canbus fueling amount. Doesn't matter what timing is doing canbus fuel will always be 1:1. Timing will adjust how much canbus fuel is used, but won't change the relationship to mpg

that's not something that would be programmed into the box under the hood. I could go through the work to do that, but it owuld require 3 more data items to push across the bluetooth. Each of those would need to be coded in and then set to be used somehow. The easier solution would be to put it in the app itself, but for the beta testing of this manual calcs are required. UI interfacing code needs to be left up to the app and not the box under the hood.

I would be worried about why the ecm is reporting is 0 volts. that's odd

late year ECM don't report boost as kpa They report it as kpa + 12ish psi. So we have to negate 12 psi from the reading the ecm gives us. Every truck I have encountered reports that 12psi, except dodgeih's/.

No worries, The next released update will prob have a setting that allow you, the user, to input a boost offset.

That's prob what will happen. You will set your offset to %100, then burn a tank of fuel and compare how much fuel you used on the screen vs at the pump and calculate from there.

Nope, I will publish at general % offset per injector size once I get it figured out. Still working on the Gallon used trip meter, that's gonna take time to figure out if I have it close enough.

Yea, idle fueling needs to be dynamic. it would idle good in a perfect situtation, but that never exists

ecm volt is coming across the canbus as well. I would look into why it is weird. What does ecm volts read?

oh I get you. No the idle state fuel is not stable enough long term to base a calculation on. I see a 200 or so bounce in canbus fuel at idle.

the ecm should be doing this already. It will only give as much fuel as needed for idle. What I have noticed is if I try and alter idle state fueling by %5 then the ecm just gives a fueling command of %5 higher.

The lope at 950 rpm is literally the Quadzilla and ecm ecm playing ping pong with the control of the signal. the issue with the manual trucks is if the quad takes over stoo soon in the rpm range it becomes very easy to stall because the ecm is going a lot of calculations right off idle. Pulling that down by a large % means there might be issues. @Dodgeih here ya go 11 psi offset of the above tune 11psi offset no lope.exe

I am going to test using a routine that fires 1 time per second to add up a mm3/sec reading and convert to gallons. We will see if this is accurate enough to show a true gallon used reading.

The logic has changed for a manual truck so that should be fine.

Sweet thanks a ton

If Iat is reading hten the canbus is working. I would turn the truck off, disconnect the box under the hood, plug it in good. then see what it does. sounds like the bow got put in a funky mood by the power issue in hte fuse block

What does IAT read? Does egt read?

Well I have working instant MPG meter in the Quad now. Now I need to figure out a Trip MPG meter....ugh

Can you clarify, Pin 6 of the ecm or pcm?