MAF vs MAP

[Shannen Durphey]

xxalexx at ix.netcom.com wrote:

> > Priority:      Normal
> > To:            diy_efi at efi332.eng.ohio-state.edu
> > From:          "bruce plecan" <nacelp at bright.net>
> > Subject:       Re: MAF vs MAP
> > Date:          Mon, 23 Feb 98 13:43:45 PST
> > Reply-to:      diy_efi at efi332.eng.ohio-state.edu
>
> > ref KV:
> > GM (OEM) specific
> >   IMHO it's as much about application as anything.  Both use
> > feedback from the O2 sensor for the final trimming of injector timing,
> > so at less than WOT, there is about 0 difference.  Now at WOT,
> > and for off-highway use racing the MAP is the winner since there
> > is no MAF restriction.  As I understand things now, on the newest
> > GMs some use both a MAF, and MAP.  Does anyone know if they
> > do this for averaging, or backup, or what conditions they use each
> > for??..
> I would say atmospheric correction, most flow meters are calibrated
> at STP(std temp press 29.92"Hg  68F) you need intake air and
> atmospheric pressure to get actual corrected flow.
> alex

  And backup.  Unhooked MAF of running 96 Corsica 3100 V6, engine never even
hiccupped.  smooooth and snappy.

Shannen