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ECMlink Wideband dropping to 0 during WOT pulls

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Joshrojas98

Probationary Member
5
1
Jul 28, 2022
Omaha, Nebraska
During tuning I am running into an issue on DSM link where it’ll give me my over all fuel trim during driving and light boost but during Wide open throttle pulls it’s reading 0 as in it saying it doesn’t need correction which is not true haha.. any help? I am currently trying to tune on 1220cc injectors in e-85 and a garret T28 turbo
 
I'm a bit confused on what you're trying to say because widebands don't normally read 0. Can you post a log please?
 
@habitatguy187 has the answer. WOT puts it into Open Loop so no feedback from sensors.
 
To add, the way you figure out if you need fuel correction during open loop / WOT is to compare your AFRest to your Wideband reading. Usually if you're on MAF then you can reference the loggable value "WBFactor", which gives you a percentage difference between AFRest and Wideband reading. If you're leaner than your target AFR, richen up your mixture at those RPMs/Load cells and/or tweak your MAFComp sliders.
 
To add, the way you figure out if you need fuel correction during open loop / WOT is to compare your AFRest to your Wideband reading. Usually if you're on MAF then you can reference the loggable value "WBFactor", which gives you a percentage difference between AFRest and Wideband reading. If you're leaner than your target AFR, richen up your mixture at those RPMs/Load cells and/or tweak your MAFComp sliders.
Maf or SD. May richen or lean the mixture in different ways but the WBFactor still works with both 😉
 
@Joshrojas98 wideband measures the air fuel mixture in the exhaust system and will never read zero when using afr (air fuel ratio), not sure about this when using lamda. Fuel trims are percentage(s) of correction the ecu is making to achieve stoich during closed loop operation. Two completely different animals.
 
Have a feeling he's just looking at fuel trims. Still important for us to know what the "wideband" reads though so we know he's not trying to have a cookout inside the cylinders.

If you are, I'll take my steaks medium done. Thanks!
 
Have a feeling he's just looking at fuel trims. Still important for us to know what the "wideband" reads though so we know he's not trying to have a cookout inside the cylinders.

If you are, I'll take my steaks medium done. Thanks!
Lol, loser. Everyone knows you can't make power until medium-well!
 
Check the box that says lock in open loop in ecm link and youll see it doesnt touch trims at idle. As soon as you go WOT trims go out the window and just have to mess with MAF or VE to hit your target.

I lock in open loop to set base idle at my desired afr before turning closed loop back on to do my driving to set cruise VEs up. Once all that is done I keep closed loop off and use my VE table for everything
 
You're talking about fuel trims? The ecu only makes fuel corrections when in closed loop operation. Wide open throttle is open loop operation and the ecu is paying absolutely no attention to the o2 sensor when in open loop.

Thanks for the help I’ll post a log tomorrow or sometime soon so you could maybe see what’s going on..
 
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