MAP - Manifold Air Pressure (Sensor)
VAFM - Vane Air Flow Meter
MAF - Mass Air Flow (Meter)
AFM - Air Flow Meter
All different methods of measuring the amount of air that enter the
engine/manifolds. Someone could tell you more specifically how each do what
they do!
zac
----- Original Message -----
From: Jordan Wallis <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, September 20, 2000 6:59 AM
Subject: Re: What is a BOV?
> Terry
> Whats the difference between MAP,VAFM,MAF and AFM?
>
>
> >From: Julian <[EMAIL PROTECTED]>
> >Reply-To: [EMAIL PROTECTED]
> >To: [EMAIL PROTECTED]
> >Subject: Re: What is a BOV?
> >Date: Tue, 19 Sep 2000 16:14:42 +1000
> >
> >yep what pressure does it release at? 50psi?
> >
> >Terry Rudd wrote:
> >
> > > Julian,
> > > You got a variety of answers to this eh - come on turbo guys, you
should
> > > know the correct answer to this question.
> > >
> > > Wastegate - bleeds excessive boost to either exhaust or atmosphere ie
> >sets
> > > the output pressure of the turbo
> > >
> > > Over Boost Valve (OBV) - bleeds excessive boost from the inlet to
> >atmosphere
> > > if the wastegate fails ie engine protection
> > >
> > > Blow Off Valve (BOV) = bleeds boosted air whist the butterfly is in
the
> > > closed position from between the turbo outlet and the throttle body to
> > > either atmosphere (pssst) if using a MAP sensed computer or to the
inlet
> > > side between the airflow meter and the turbo if using VAFM or MAF
sensed
> > > computer and an intercooler is recommended for the later AFM types as
> >the
> > > air is hot from the first time round. The purpose of the BOV is to
> >prevent
> > > the turbine stalling when the throttle body is closed and is triggered
> >by
> > > low vacuum in the manifold.
> > >
> > > terry
> > >
> > > -----Original Message-----
> > > From: [EMAIL PROTECTED]
> > > [mailto:[EMAIL PROTECTED]]On Behalf Of Julian
> > > Sent: Monday, 18 September 2000 3:01 PM
> > > To: OZDAT
> > > Subject: What is a BOV?
> > >
> > > Ok, yeh i know what a BOV is used for, but what a BOV actually do?
> > >
> > > >From what i can tell it is just a pressure relief valve, so when a
> > > certain pressure on the BOV is attained, it releases, letting a large
> > > amount of pressure through the valve (back into the intake or to
> > > atmosphere).
> > >
> > > If this assumption is correct, then what i want to know is what
pressure
> > > do BOV's usually vent at?
> > >
> > > Could you use any valve which has enough flow when it vents?
> > >
> > > The reason i am asking is because i have contacts at a large pneumatic
> > > supplier so I can possibly experiement with different industrial
valves
> > > if i can find any that fit the purpose..
> > >
> > > just a thought anyway
> > > - Julian
> > >
> >
>
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