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Vtec not disengaging low load/ wideband lambda.
Posted: Sat Aug 03, 2024 1:39 pm
by 08FitSport
I upgraded the camshaft to a delta 272 regrind. Crusing at 75-90 mph the engine stays in vtec low load. What can I control with adding wideband to the ecu? Can I change the Target lambda at cruising and idle to leaner then 14.7?
I changed the vtec window to:
lower 3800 upper 4500
vtec window pressure
rpm 3700 4000 4200 4800 5200
.886 .572 .403 .403 .222
Re: Vtec not disengaging low load/ wideband lambda.
Posted: Mon Aug 05, 2024 6:22 am
by 08FitSport
jeffreestar wrote: Sun Aug 04, 2024 8:53 pm
08FitSport wrote: Sat Aug 03, 2024 1:39 pm
I upgraded the camshaft to a delta 272 regrind. Crusing at 75-90 mph the engine stays in vtec low load. What can I control with adding wideband to the ecu? Can I change the Target lambda at cruising and idle to leaner then 14.7?
I changed the vtec window to:
lower 3800 upper 4500
vtec window pressure
rpm 3700 4000 4200 4800 5200
.886 .572 .403 .403 .222
fnaf game
Adding a wideband oxygen sensor to your ECU will help you monitor the AFR more accurately and make better tuning decisions.
I am a tuner I understand that. But seems like the ecu in the fit will not allow you to run a leaner mixture then stoich in closed loop with the factory primary o2. My question was will adding a wideband for closed loop operation allow you to run leaner mixtures then stoich.
Re: Vtec not disengaging low load/ wideband lambda.
Posted: Mon Aug 05, 2024 6:38 am
by Hondata
The last reply was from a spam bot.
There's a lot of logic in the ECU which is fixed to target stoichiometric.
Re: Vtec not disengaging low load/ wideband lambda.
Posted: Tue Aug 06, 2024 10:57 am
by 08FitSport
Hondata wrote: Mon Aug 05, 2024 6:38 am
The last reply was from a spam bot.
There's a lot of logic in the ECU which is fixed to target stoichiometric.
Even with wideband lambda? Why is my car staying in vtec at cruising speeds? 70-80 mph?
Re: Vtec not disengaging low load/ wideband lambda.
Posted: Tue Aug 06, 2024 12:49 pm
by Spunkster
Without the calibration and datalog showing the issue, it is hard to speculate.
Re: Vtec not disengaging low load/ wideband lambda.
Posted: Tue Aug 06, 2024 4:27 pm
by 08FitSport
I’ll post up very soon. Have to data log it as I think I maxed out the factory injectors
Re: Vtec not disengaging low load/ wideband lambda.
Posted: Thu Aug 08, 2024 3:29 pm
by 08FitSport
Here is the calibration and datalog. Vtec engages at its set point then stays engaged at cruising speeds. turns on and never turns off.
Re: Vtec not disengaging low load/ wideband lambda.
Posted: Thu Aug 08, 2024 4:47 pm
by 08FitSport
forget to attach files
Re: Vtec not disengaging low load/ wideband lambda.
Posted: Tue Aug 13, 2024 8:13 pm
by Hondata
Let's pick a point in the middle of the datalog. 4000 rpm MAP 66 kPa.
The VTEC table has 57 kPa (0.572 bar) at 4000. So VTS will be on.
Re: Vtec not disengaging low load/ wideband lambda.
Posted: Wed Aug 14, 2024 7:08 am
by 08FitSport
Hondata wrote: Tue Aug 13, 2024 8:13 pm
Let's pick a point in the middle of the datalog. 4000 rpm MAP 66 kPa.
The VTEC table has 57 kPa (0.572 bar) at 4000. So VTS will be on.
I figured it had something to do with vtec pressure window. Thanks for the help. I will raise the map pressure so it stays off when crusing.