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Help me understand this Datalog snapshot. (Max out fuel injectors?)

331 views 19 replies 7 participants last post by  FiveTwo  
#1 ·
I’m trying to learn a little bit here so bare with me, but it just isn’t adding up. Looking for some input from the people on here that are educated on tuning (you know who you are). My whole concern was maxing out my injectors if I go any further on my mods. My current set up is 1050X injectors (RUNNING E85), ported blower,108mm TB, 2.7 upper, & a tune. I have read in a half dozen threads about 1050 injectors almost being maxed out with duty cycle on corn and needing 1300s. See attached data log. How is it possible I’m showing my injector% only at 47.3% @ over 8,100rpm??? Am I missing a piece of the equation? I surely expected much higher.
Image
 
2021 Ford GT500 owns
E85,Tune,2.7 upper
#5 ·
This is the latest data log I had sent to the tuner to their request (not specifically for the fueling) just for them to review after loading the tune which is why I suspect so many channels. There are 2 pages of channels going. @ catmonkey.. the 94.5% cycle makes sense to me.. this was the first time I tried to review a log and not just blindly send back to the tuner. I figured I had no clue what I looking for, thank you
 
#6 · (Edited)
With a large number of channels open, it can skew certain data because of the refresh rate. I have more experience with the SCT product, Live Link, so I'm not sure what's going on in the log as to the duty cycle calculation. However, the PW duty cycle calculation is solid, if the PW data is correct. That's not a lot of head room if you regularly use E85. A nice crisp day with good air and you could see a higher duty cycle.
 
#10 ·
Always go big fuel on corn.
 
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#11 ·
I’m aggravated with myself for not doing enough research prior and the company I purchased the package from. I feel like someone should’ve said “if you’re going to run E85 or add more mods down the line, I would recommend bigger injectors that we also sell. I would’ve gladly paid the additional $700. But too late for that. Lesson learned
 
#15 · (Edited)
Less RPM gives the injector more time to be open, thus lowering your injector duty cycle. Or at least that's my naive understanding of it. 7,500 RPM limit would put you around 87% duty cycle if my math is correct. I think I'd rather keep the current smaller 2.7 pulley but rev the engine less so you still benefit from the increased power and torque down low.
 
#19 ·
Just noticed your fuel trims are crazy. STFT's are pretty consistent but super high (adding fuel). Normally you'd want to see within 5% correction. LTFT's are crazy too, and not consistent bank to bank. Did your tuner say anything about this? I'm a novice and could 100% be missing something here but it did surprise me.