Yes perhaps by saying add 5 he meant add -5?
I'm using Torque with a Clone ELM OBDII Reader. I have balance rates for CylindersTo get the actual balance rate of your cylinders, you must know the fuel rate/injection amount at the time the balance rates are taken (this will become VERY clear in a few minutes why you MUST know this number). The engine should be at 170 degrees or hotter, at a normal 680 idle (01 idle at 600, and LMM's idle at 720), rail pressure should be 35MPA for federal LB7's, and 30 MPA for most others, the battery should be charged with no abnormal loads on the engine (IE A/C off), and vehicle speed is 0MPH (the ECm only does balance rates when the engine is idling, and vehicle speed is less than 2 MPH). The fuel rate/injection amount should be at 8-9MM3 of fuel with all of these conditions met (at sea level it is safe to use the 8MM3 of fuel number, at 5000+ feet use the 9MM3 of fuel number. VVT trucks(LLY+) with the turbo closed at idle like in stock tuning will be closer to 9-almost 10MM3 of fuel at idle due to the extra engine load to spin up the turbo at an idle with the veins closed.
You could STILL have a leak from somewhere other than an injector, e.g. a fuel return line.I just replaced 8 injectors that by this math had 3 out the 8 injectors bad and the calculated fuel rate was 5.8mm3. Now the balance rates with new injectors look great with all being +/- .75 or so. the problem I'm having is that my oil level still seems to be increasing and my calculated fuel rate is still right around 5.8mm3. Please advise as to why the fuel rate is still low and what i should look for.
I'm using Torque with a Clone ELM OBDII Reader. I have balance rates for Cylinders
1 thru 8:
Cyl 1 = 1.3
Cyl 2 = -2.1
Cyl 3 = 1.5
Cyl 4 = -3.5
Cyl 5 = -2.8
Cyl 6 = 3.0
Cyl 7 = 2.6
Cyl 8 = .1
Temp = 176 Degrees
Fuel Rail = 5008.2 PSI = 35.026 MPA (MPA = PSI / 145.0377)
Fuel Flow = 84.08 cc/min (as read from Torque)
This fuel flow looks incorrect for idle on the Duramax, or it's a value of some
flow that I don't understand. I don't have any other options on the application
Torque to see how much the injectors are really applying in idle.
I'd think it would be ((8 mm3/sec +-the Balance) * 8 Injectors) * 60
If I assume a flow of (6 mm3/sec + maybe 2 mm3/sec per cylinder * 8 ) *60
I'd think the flow would be around (64*60) or 3840 mm3/min or 3.84 cc/min
So, why is the rate showing as 84.08 cc/min? What is the actual PID that
should give the Fuel Rate/Injection?
Is there a way without a Tech 2 to get that Fuel Rate/Injection value?
Thanks for a GREAT posting on Balance rates.