after market airflow meters

[Warwick Anderson]

I thought it would be fooling it, but would it not throw a code?

I dont belive thay reduce restriction  very much(the ones i have seen) as
thae bolt stright in to where the old one was, so same inlet and outlet size
ect...


>
>
> > At 10:25 PM 3/21/01 -0500, you wrote:
> > >> how do aftermarket airflow meters increase HP?
> >
> > By fooling the A/F ratio and by reducing restriction to airflow.
>
> The fooling the A/F part is often where the most gain is achieved with
> changing to the aftermarket MAF's (at least in the applications we have
> seen) but also poses the most risk because the ECM no longer has accurate
> control of the AFR and can sometimes go lean at WOT. The reason a gain can
> be seen on a stock ECM/PCM is because the factory usually targets AFR's of
> 11 to 12 at WOT to protect the catalysts (and in some boosted applications
> targets even richer AFRs). The ECM no longer having the proper MAF
> calibration can cause the WOT AFR to be leaner (we have seen some of the
> aftermarket MAF's lean the cars out over 2 full ratios). The big problem
can
> be if the ECM is commanding leaner values (for example, not yet in PE or
> modified calibration with leaner WOT AFR's already), then the AFR can be
too
> lean and cause detonation, spark retard and potential engine damage. We
have
> seen this on the chassis dyno on several vehicles.
>
> Just my $0.02
>
>
> Jason
>
>
> --------------------------------------------------------------------------
--
> To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the
quotes)
> in the body of a message (not the subject) to majordomo at lists.diy-efi.org
>

----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org