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Thread: 94 Roadmaster Estate .bin

  1. #16
    Fuel Injected! steveo's Avatar
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    I took a drive to town this morning and logged it.
    that's not much of a drive, you need more varying conditions to log. you barely even hit the gas. dont be afraid to shift manually and drive crazily during logging to get more useful data.

    Quote Originally Posted by jstrand87 View Post
    I think you are correct with the new intake I am running rich and I have noticed my off the line power is down.
    nope, lean. run the analyzer on that log, you're 10-20% short on fuel depending on region.

    are you sure you didn't leave a clamp loose or a hose unhoooked on that intake? that's kind of what it looks like to me.

  2. #17
    Fuel Injected! steveo's Avatar
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    another thing that helps you get more data is -temporarily- turning the power enrichment tps threshold way up so it doesn't go into power enrichment as much. that way you can get more heavy load and throttle fueling data while staying closed loop.

  3. #18
    Carb and Points!
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    Okay guys, I think I need some advice.

    I feel a little dumb asking the question but... on the EEHack dashboard you have your target AFR and the WB AFR readout. Target AFR is usually 14.7 while cruising or not in PE mode. Is the WB AFR number the calculated AFR that the sensor is seeing or is that the "setpoint" that is trying to drive the BLM?

    For example if the WB readout is 12.5:1 and the target 14.7:1 is the PCM trying to add fuel because the car is running lean? Or is the O2 sensor reading rich and the PCM is trying to lean out the ratio.
    Last edited by jstrand87; 07-12-2018 at 07:01 AM.

  4. #19
    Fuel Injected! steveo's Avatar
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    Quote Originally Posted by jstrand87 View Post
    Okay guys, I think I need some advice.

    I feel a little dumb asking the question but... on the EEHack dashboard you have your target AFR and the WB AFR readout. Target AFR is usually 14.7 while cruising or not in PE mode. Is the WB AFR number the calculated AFR that the sensor is seeing or is that the "setpoint" that is trying to drive the BLM?

    For example if the WB readout is 12.5:1 and the target 14.7:1 is the PCM trying to add fuel because the car is running lean? Or is the O2 sensor reading rich and the PCM is trying to lean out the ratio.
    nothing about the wideband afr "drives the blm", your ecm doesn't use a wideband (if you add one, it's only for logging).

    do you have a wideband hooked up? if so, get your data logged, and use the analyzer, you can't really tune fueling effectively from the dashboard.

    the target afr is something you would generally ignore when not running in open loop (this includes power enrichment which is technically 'in closed loop mode' even though the o2 sensors are ignored). in closed loop it's fairly meaningless. if you're doing an open loop tune, though, it's nice to have.

  5. #20
    Carb and Points!
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    Hi all
    I have been a little busy with work and travel lately but I finally got some more data on the ol' RMW. I have a nice new 2.5" cat back exhaust installed along with a short ram intake.

    Attached are a couple logs and the current .bin i am running. The trims are looking pretty close I believe. I think I need to look into the PE next but I am a little unsure. Unfortunately I do not have a wideband O2 sensor installed yet. Can I go any further with my tuning adventure without the wideband?

    Any input or advice would be appreciated. Hopefully I'm on the right track so far.
    Attached Files Attached Files

  6. #21
    Fuel Injected! Dirtybob's Avatar
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    I disabled PE, ran a bunch of WOT logs, and then tweaked the MAF tables on my '95 RMS before I had a wideband. I was shooting for 12.75:1 in PE, 1/4 mile times were unchanged. Not too sure where acutal PE AFR ended up....

    Later I installed some 1 5/8 shorty headers/new 2.5" exhaust and re-scaled the MAF tables in the cruising areas. Car picked up about 2 tenths, mostly in the 60'.
    Got a wideband finally and was seeing about 12.6:1 in PE mode, I leaned it out closer to 13.1:1 and the car picked up another tenth/tenth and a half and about 1.5 mph.
    Then my MAF dies and I assume it must have been going south for a while because after replacement my fueling was way off. I copied in a stock MAF table and made a few small tweaks to PE (still for 13.1:1) and the car runs the same as before (i.e. with the old crummy MAF) but cruise is a bit leaner (1-2%).

    Can I go any further with my tuning adventure without the wideband?
    so based on my meandering commentary above, probably/maybe/YMMV

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