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  1. M

    Lean Burn Tuning?

    Nox doesn't go up in lean cruise on gasoline. Nox on gas engines is from peak combustion temp..peak combustion temp is 14.1 to 15.1 area...afr wise....lean burn 16 to 1 or higher actually decreased nox and emissions overall.. after 16 to 1 egt ( and combustion peak temp) drop like a...
  2. M

    Lean Burn Tuning?

    Another update....got fuel pump fixed and imported wideband signal through egr pintle voltage so now have a pid in HP tuners that has actual and commanded afr. Will make a quick video on the basics of setting up for those who feel brave enough to try it on own.
  3. M

    Lean Burn Tuning?

    Been a minute since I been here but last week did fill up tank and make a run to wrecking yards local to me (75 miles one way) 2 days in a row. So roughly 250 miles at a steady 63 mph on cruise and rest of miles in Spokane which seems to have a light every half mile and never hit 2 greens in...
  4. M

    Lean Burn Tuning?

  5. M

    Lean Burn Tuning?

    Here is a quick pic of a log. Notice STFT basically all 0. That's one confirmation it's in lean cruise. Also look at 02 sensor bar in middle..they stay down low dead lean . Commanded afr reads 19.32 but actual reading is 18.3 to 18.5. I have an older innovate wideband that doesn't import...
  6. M

    Lean Burn Tuning?

    I'll post logs but I am in lean cruise up to 50% throttle which equates to being in lean cruise 99% of the time..even climbing grades. And yes transmission shift schedule tuning and lock up tuning is worth around 1 to 1.5 mpg. The nice thing about these pcm is the tow haul button gives you 2...
  7. M

    Lean Burn Tuning?

    I will have to open up an e38 file and see if it's there. You could do a speed density tlean burn tune for sure. As I generally tune boosted cars for speed density... But if it has the equivalence ratios for timing and fuel reduction per cylinder mass in the pcm already that's more desirable...
  8. M

    Lean Burn Tuning?

    Your right on track. Common misconception is running lean equals heat and melted pistons...that's only true at max effort high loads....example. Wide open throttle pulls in a 400hp engine with an afr of 14:1 will result in engine damage.... It's too lean...but technically 14:1 is richer than...
  9. M

    Lean Burn Tuning?

    I use hotuners , efi live and some other open source platforms. I'm working on using the open source code to tune lean burn but haven't finished yet...I'm in NE Washington state
  10. M

    Lean Burn Tuning?

    It's code in all of our pcms...well at least the p01 and p59....Holden is a gm subsidiary and the Australians use lean burn...I am using HP tuners and changed my platform from gmt to a "V" platform. That is what Australians are...so when you change to the v and write entire the next boot up the...
  11. M

    Lean Burn Tuning?

    I'm in the 20 percent better mpg at 17.9 to 18.4 to 1. About 50 degrees of timing ...zero detonation and trying to make a smooth primary ve table to cruise at about 40 percent throttle and 18.5 to 1 to reduce pumping losses. My injector duty cycle is definatley lower and I'm still running maf...
  12. M

    Lean Burn Tuning?

    Yes I'm doing it now In a 2001 Silverado and 2002 suburban. Been working on it everytime I drive which isnt everyday...the pickup I'm over at 19 mpg tank average up from 15. I live in mountains and truck is always loaded with something..lol. Have to change platform to V and write...

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