Hondata

I'm using a Hondata base map designed for 95 RON fuel, but I'm seeing AFRs around 14.5:1 under boost (~10 psi), especially during partial throttle (around 60% pedal, ~3900 RPM, MAP 10 psi).

Despite being on a "safe" 95 RON tune, the ECU appears to remain in closed loop, following the lambda target of 14.7:1. This results in excessively lean air-fuel ratios under load, which is risky — even more so when running 95 octane fuel.
That was strange to see for me, was thinking base maps are safe for sure

i have only prl hvi stock

The AFR you are talking about is consistent with the stock one, it is not Lean for the conditions described. 11 psi and 140%Airc can barely be called load for this engine.
You really have nothing to worry about. There is no risk.
If you are still worried, you should get a custom tune that will give you infinitely more than the standard calibrations offer.

Cheers

Rares wrote: Fri May 09, 2025 11:56 pm The AFR you are talking about is consistent with the stock one, it is not Lean for the conditions described. 11 psi and 140%Airc can barely be called load for this engine.

Screenshot 2025-05-10 at 09.52.05.png

Screenshot 2025-05-10 at 09.52.11.png

You really have nothing to worry about. There is no risk.
If you are still worried, you should get a custom tune that will give you infinitely more than the standard calibrations offer.

Cheers

Thanks for answer