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Thread: $OD Lean Cruise

  1. #1
    Fuel Injected! PJG1173's Avatar
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    $OD Lean Cruise

    is there a lean cruise in $0D?
    87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
    93 S10, 12" spring lift, 4.56 gears, F/R lockers, 36x12.5x15 TSL's, long tube headers, 266HR cam, p&p vortec heads, $0D Marine MPFI.
    05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,

  2. #2
    EFI GearHead ! EagleMark's Avatar
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    I don't know of a Lean Cruise patch like there is for $42 but I have heard guys you can do something in tune to make it happen. Once I get the kids truck running I'll have a lot of time to play with $OE

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  3. #3
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    if someone has a good hack, i could probably make up a patch for 0D similar to the way the 42 one works.

    obviously, someone would need to beta test it before it goes full-public though.
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


  4. #4
    EFI GearHead ! EagleMark's Avatar
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    $OD Lean Cruise

    Since they are very simalar it shouldn't be hard to duplicate. I will test $OE!

    93V8S10 knows these well. $OD was for 4L60E and $OE was for 4L80E but couple of us are running $OE manual
    Attached Files Attached Files

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  5. #5
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    plenty of space starting at 6B83 to impliment a patch in 0D, i'll assume 0E is similar.

    what all do you guys want in terms of prerequistes to enter/stay in lean cruise? time since startup/coolant temp/etc?

    and other than obviously a modified AFR, do you want anything else to be triggered be lean cruise? added/removed SA?

    and i assume you'll want a table for determining the target AFR based on MAP? or MAP and RPM or ?????
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


  6. #6
    Fuel Injected! JeepsAndGuns's Avatar
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    I could also be a test mule. I am running $0E with a manual trans. I also just installed a innovate wideband 02 and gauge, so I can actually watch and see if its working, and keep an eye on it to make sure it doesnt do anything funky.

    I would think a timer or "delay" would be a good idea. That way when you set up what parameters need to be met to enable it, it will then start a timer to engage it. That way its not constantly trying to kick it on, then back off.

    I have no clue how it exactly works in $42. But thinking of what it does, I would think the way I would want it to work, would be set up parameters to only enable it above XX MPH. Add something in there for map, so if the map drops below a specific range, it drops out of lean mode and goeas back to regular. I would think this would be good when pulling hills. I would think pulling a hill, or hitting the gas to pass someone, you wouldnt want it to be lean. And then add a timer or delay, for when you get above XX MPH, and below XX MAP, start a delay of mabey 30 seconds then enable. Then as long as your above XX mph, and stay below XX map, it will stay in lean mode. Probably would be a good idea to add a temp parameter, that way you have to be above a specific temp to enable it (so it doesnt kick on, with a cold engine). Mabey a max temp would be wise too? That way, if you start running hot, and temp climbs, it goes back to regular fuel to help keep from over heating. (I know leaner = usaly hotter engine)

    But I have no idea if something like that could be set up, as I have no clue about how the HW lean mode works, or how you could hack/add something like that to a code.
    79 Jeep Cherokee, AMC 401, T-18 manual trans, hydroboost, 16197427 MPFI system---the toy

    93 Jeep YJ Wrangler, 4.0L, 5 speed, 8.8 rear, homebrew hub conversion and big brakes, hydroboost, 2.5in OME lift, 31x10.50's---the daily driver

    99 Jeep WJ Grand Cherokee limited, 4.0L, auto, 2wd, leather and power everything, 99% stock---the long distance highway ride.

  7. #7
    Fuel Injected! gregs78cam's Avatar
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    I'll test the beta as well. I run $0E in both my truck and Camaro, and they could both use a little better mpg.
    1978 Camaro Type LT, 383, Dual TBI, '7427, 4L80E
    1981 Camaro Z-28 Clone, T-Tops, 350/TH350
    1981 Camaro Berlinetta, V-6, 3spd
    1974 Chevy/GMC Truck, '90 TBI 350, '7427, TH350, NP203, 6" lift, 35s

  8. #8
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    all of that stuff is relatively easy to setup, assuming there is some free RAM leftover for the timer itself.

    but once there is a general agreement on what all it should be, i'll write up a patch, and whoever wants to test it will need to send me a BIN, i'll apply the patch, send it back, test, refine if necessary, then release.

    someone would probably need to reformat my work a bit to make it assembler-friendly though, since i do all of my patching via a hex editor.
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


  9. #9
    Fuel Injected! gregs78cam's Avatar
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    Speaking of 'patches', I have been wondering this for a while......Is there a difference between "patching the bin" using whatever DOS program, and just writing the code in the bin using the hex editor, like what we do with the cooling fan code?
    1978 Camaro Type LT, 383, Dual TBI, '7427, 4L80E
    1981 Camaro Z-28 Clone, T-Tops, 350/TH350
    1981 Camaro Berlinetta, V-6, 3spd
    1974 Chevy/GMC Truck, '90 TBI 350, '7427, TH350, NP203, 6" lift, 35s

  10. #10
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    as long as you end up with the same file by both methods, then no, the only difference is time.

    unfortunately, i can't seem to get ahold of any assemblers for the 6811 that work with a x64 OS (Vista Ultimate x64), so i have to patch it old-school.

    once one is patched though, you can make an XDF with all of the locations of the patch defined and literally copy/paste the patch from one BIN to another.
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


  11. #11
    Fuel Injected! gregs78cam's Avatar
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    OK, that is what I figured, just wanted to make sure I understood it correctly
    1978 Camaro Type LT, 383, Dual TBI, '7427, 4L80E
    1981 Camaro Z-28 Clone, T-Tops, 350/TH350
    1981 Camaro Berlinetta, V-6, 3spd
    1974 Chevy/GMC Truck, '90 TBI 350, '7427, TH350, NP203, 6" lift, 35s

  12. #12
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    yeah... this won't be too bad though, compared to my nAst1 project. i expect maybe 75-100 bytes of algorithm for this, plus whatever calibration bytes do get decided upon.

    as a comparison, in normal 6D/88/8F/A1/DF/P66 V6:

    there is no timer for high fuel alone (just for high spark)
    there is a MPH requirement and hysteresis companion
    "highway spark" mode must be active to allow highway fuel (which also serves as a secondary MAP cutoff)
    option for 4th gear only
    option for TCC locked only
    minimum coolant temp
    minimum RPM
    maximum MAP

    now in my personally modded P66 V6 code, i've made it a requirement for both high spark and high fuel requirements to be met before either is allowed to activate, essentially making my high spark stuff a "highway fuel active spark modification".
    1995 Chevrolet Monte Carlo LS 3100 + 4T60E


  13. #13
    I'm running $0D with an automatic, but not using the transmission control, and would be glad to help out, too. I have easy access to a 75mph highway to test it, too. :D

    Lean cruise would be an awesome addition to an already excellent code/computer combination!
    Familiar with 1227747 and 16197427 PCMs

  14. #14
    Vintage Methane Ejector
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    There is a way of doing something similar to lean cruise in $E6, $0D, $0E, and $31. $0D listed.

    Title: Open Loop AFR Enable
    Location: 400D-Bit 0
    Usage: Air Fuel Mode Words
    Tips: Enables use of L4BB4 "Open Loop AFR vs. Temperature vs. Vacuum" table for closed loop fueling, when coolant temperature less than L48C7 "Maximum Temperature for AFR Lookup in Closed Loop". Can be used for a "lean cruise" or other specific fueling conditions.

    Title: Maximum Temperature for AFR Lookup in Closed Loop
    Location: 48C7
    Usage: Closed Loop Qualifiers
    Tips: If temperature less than setting, table at L4BB4 "Open Loop AFR vs. Temperature vs. Vacuum" will be used for closed loop fueling instead of L48DD "Stoichiometric AFR", but only if L400D Bit 0 "Open Loop AFR Enabled" is enabled.

    Title: Stoichiometric AFR
    Location: 48DD
    Usage: Open Loop AFR Parameters
    Tips: Used if temperature greater than L48C6 "Minimum Temperature for Closed Loop". Used if temperature greater than L48C7 "Maximum Temperature for AFR Lookup in Closed Loop" if L400D Bit 0 "Open Loop AFR Enabled" is enabled.

    Title: Quasi- Closed Loop Lower AFR Limit
    Location: 48DF

    Title: Open Loop AFR vs. Temperature vs. Vacuum
    Location: 4BB4
    Usage: Open Loop AFR Tables
    Tips: Normally used for open loop but can be used in closed loop if L400D Bit 0 "Open Loop AFR Enabled" is enabled and temperature is greater than L48C6 "Minimum Temperature for Closed Loop" and temperature is less than L48C7 "Maximum Temperature for AFR Lookup in Closed Loop".

  15. #15
    EFI GearHead ! EagleMark's Avatar
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    TunerPro has a S19 option I could never get to work. The $42 Lean Cruise Patch was a S19 file, I made some changes to it and got it to work through Command Prompt in windows 7. But $42 had it built in and turned off. The paremeters for it to work would be all we need I think. The XDF items are in $42-1227747-V3.xdf Here's a write up with S19 patch file and how to. HTH!
    http://www.gearhead-efi.com/Fuel-Inj...on-1227747-ECM

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

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