Air fuel mixture always show lambda 1 at WOT

[typer86]

Hi Hondata team,
I am tuning currently an EP3 (europe) with KPro4.
In datalog I found, that the lambda shows always Lambda 1 (14.7) so I am currently unable to configure the fuel mixture....
The Voltage of the O2 stay on 0.90V also if I add fuel on the table.

This car has fitted as primary O2 sensor an NGK O2 meter
NGK Lambdasonde 0061 for HONDA K20 Type-R 1998
(OE number: 36531-PRA-G010-M2 36531PRAG01 36531PRAG010M201)

Is the wrong o2 sensor fitted or selected in the closed loop setting?

It is strange because the FN2 has also fitted an narrowband and showing rich values.

> Is this normal on the EP3? Must be an wide-band AEM O2 sensor must be fitted to show the rich values?
Datalog:

EP3_New_NGK_lambda_1.kdl

(2.33 MiB) Downloaded 83 times

The calibration I have sent to Suuport@hondata.com for review.

Thanks for input.

Kpro_closed_loop_values_1.png (25.41 KiB) Viewed 938 times

Kpro_closed_loop_values_2.png (29.11 KiB) Viewed 938 times

Kpro_closed_loop_values_3.png (29.23 KiB) Viewed 938 times

[Hondata]

The PRA ECU uses a narrow band, which cannot read lambda.

[typer86]

So it is normal that at WOT AF 14.7 (lambda 1) will be dispalyed?

I guess the narrow band is also be able to show AF 12.5 (lambda 0.85) - or not?

[Hondata]

Yes, normal. A narrow band can only show richer or leaner than stoichiometric, and has significant hysteresis, so it not useful for tuning.

[typer86]

Thanks for information. The customer will add the AEM wideband ... :) Then we will continue.
Something new learned.