Page 3 of 3 FirstFirst 123
Results 31 to 38 of 38

Thread: EEhack

  1. #31
    LT1 specialist steveo's Avatar
    Join Date
    Aug 2013
    Posts
    4,007
    your log is only 7 minutes of non-moving idle, that won't do much good to actual tuning (unless all you want to tune is hot idle)

    what 160 BLM means is that the computer is trying to add more fuel, and it has to dump so much fuel (at least 25% more) that it gives up. this is because it's interpreting your very low o2 voltage as 'lean'.

    run my 'cl performance' analyzer:

    your O2 sensors never exceed 700mv and are only generating 136 cross counts for 3100+ events. this isn't normal.

    either you have a massive vacuum leak at idle, a massive exhaust leak, you need more idle fuel (maybe a constant is way out), or your o2s are not behaving correctly.

    i looked at your bin, are you actually running 37lb injectors? i also think your cylinder volume constant is a bit high, i usually use ~7.85-7.90 for a 383 and you have 7.97.

    i might try just lowering your injector constant slightly until it doesn't peg BLMs at 160, then you can log and tune from there?

  2. #32
    Fuel Injected! Stroked 388's Avatar
    Join Date
    Jan 2017
    Age
    51
    Posts
    114
    I have 36# injectors the spec sheet calls for 37.12 at 43.5 fuel pressure. I can not hear any exhaust leaks. I will get out the fog machine and fog the intake and exhaust. I will change what you recommended and see what happens. Thanks a bunch Steve I will let you know the out come

  3. #33
    LT1 specialist steveo's Avatar
    Join Date
    Aug 2013
    Posts
    4,007
    another approach is investigating by feel

    does it run better, or worse with the 160 trims?

    if you go to eehack's parameter control page and RESET BLMs (so it runs just fueling tables without the o2s acting out), does it get smoother or rougher?

    how about if you check 'override afr' and lower the slider (adding more fuel. this keeps it out of closed loop). you can try 'expert mode' in that same screen to get more extreme AFRs.

    you could also try skewing spark advance down and see if less timing advance gives you a smoother or rougher idle

    the results from that kinda stuff will give you more clues

  4. #34
    Fuel Injected! Stroked 388's Avatar
    Join Date
    Jan 2017
    Age
    51
    Posts
    114
    Thanks for the information I will do that testing to. Thanks alot for all the help Steve

  5. #35
    Fuel Injected! Stroked 388's Avatar
    Join Date
    Jan 2017
    Age
    51
    Posts
    114
    Changed all that you recommended. Depending on what constant was changed the high BLM will go from side to side while the other will drop to 128. I did see that the driver side o2 has very low cross counts. So what that tells me is that o2 is not switching back and forth. I got a new set to replace the new ones I already had. What do you think would make the low cross counts ? Bad signal wire ? From computer

  6. #36
    Fuel Injected! Stroked 388's Avatar
    Join Date
    Jan 2017
    Age
    51
    Posts
    114

    MODS

    tried to upload a mod list wont let me it tells me the web page is not working ill try again later. Thanks Steve

  7. #37
    Fuel Injected! Stroked 388's Avatar
    Join Date
    Jan 2017
    Age
    51
    Posts
    114
    got it to load had to put it in a zip file. Any questions on the mods just let me know. Thanks
    Attached Files Attached Files

  8. #38
    LT1 specialist steveo's Avatar
    Join Date
    Aug 2013
    Posts
    4,007
    LT1 388 forged rotating assembly
    Spayed main bearing caps
    Bore: 4.060
    Stroke: 3.750
    Rod Length 5.700
    Hellfire rings
    Trickflow Aluminum heads
    62cc Combustion Chamber
    2.02in./1.60exh.
    .600 lift springs
    1.5 Roller rockers
    Comp R lifters
    Chromoly push rods
    Lunati VooDoo 60123 cam
    Duration: .294int./.302exh
    Duration @ .050: .243int./.251exh
    Gross valve lift: .560int./.565exh.
    LAS: 110
    36 lb. Accel injectors
    14.4 ohms
    Actual flow rate @ 43.5 (37.12)
    High vol oil pump
    Racetronics 255 high vol. fuel pump with hot wire kit
    58mm BBK Throttle body
    IAC drill mod
    Pro M 3AL75 MAF meter
    MSD coil
    MSD Opti spark
    MSD 8.5 Wires
    Moroso CAI
    TB coolant bypass
    Long tube Pacesetter headers

Similar Threads

  1. '94 LT1 EEHack analysis using WB
    By babywag in forum GM EFI Systems
    Replies: 17
    Last Post: 09-11-2022, 11:38 AM
  2. EEHack target afr
    By Terminal_Crazy in forum GM EFI Systems
    Replies: 4
    Last Post: 12-04-2016, 06:17 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •