Vtec not disengaging low load/ wideband lambda.

[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

[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
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.

[Hondata]

The last reply was from a spam bot.

There's a lot of logic in the ECU which is fixed to target stoichiometric.

[08FitSport]

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?

[Spunkster]

Without the calibration and datalog showing the issue, it is hard to speculate.

[08FitSport]

I’ll post up very soon. Have to data log it as I think I maxed out the factory injectors

[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.

[08FitSport]

forget to attach files

[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.

[08FitSport]

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.