FW: MAF Upgrad

[Espen Hilde]

NO ,differences in exsaust backpressure is as important as inlet pressure.
A nice thing to do is to connect the two exhaust manifolds together , after
the initial pressure is there. By using a waste gate , adjusted to open 
at 0,4 kg.Then the turbo's can be speeded up by strong pulses.At high rpm.
the turbine is more efficient at constant pressure,connecting the exhaust
manifolds with a wastgate will dampen pulses.One cylinder can dump exhaust
into two turbos.If you use one wastgate in each turbo,connect both
wastgates
to one side pressure.It will dampen pressure occilation.Bevare of cracs at
wastgate valve surface.Small differences here will make one turbo pump
harder.
I talk from expiriance from modifying a Maserati biturbo (oddfier)with
modified cylinderheads,bigger turbos and Elektromotive Tec-1.
                    Espen Hilde
----------
> From: BUTLER, Tom <TEBUTLER at mccain.ca>
> To: 'diy_efi at efi332.eng.ohio-state.edu'
> Subject: RE: FW: MAF Upgrad
> Date: 24. februar 1998 18:49
> 
> Run the boost of both turbos into the one plenum.  It then won't make
> any difference whether one turbo is making more boost than the other.
> 
> > -----Original Message-----
> > From:	Frederic Breitwieser
> > [SMTP:frederic.breitwieser at xephic.dynip.com]
> > Sent:	Tuesday, February 24, 1998 1:44 PM
> > To:	diy_efi at efi332.eng.ohio-state.edu;
> > diy_efi at efi332.eng.ohio-state.edu
> > Cc:	diy_efi at efi332.eng.ohio-state.edu
> > Subject:	Re: FW: MAF Upgrad
> > 
> > >case.  It might be easier to just have one MAF supply voltage (and
> > the 
> > >other is a dummy) and just change your tables to compensate.  i.e.
> > assume 
> > >that twice the amount of air is entering the engine as the MAF says
> > there is.
> > 
> > The advantages of doing this is its very simple to devise - bolt on a
> > few
> > MAFs and connect them up.  But, with my desire to run twin turbo's,
> > this
> > introduces more potential for problems, as I'd have to have the ECM be
> > aware of one turbo is boosting higher than the other...  I debated for
> > a
> > while, physically mounting the turbo's in such a way that I could put
> > a
> > shaft rod between them to ensure they boost at the same level, but I
> > dunno.
> >  I started making my manifold anyway, though the front of the intake
> > log
> > plenum has an open face - I'll be welding on a panel with either one
> > hole
> > or two depending on how I'm going - I have two MAFs, two
> > ThrottleBodies,
> > and using two, allows more flow with cheap OEM junkyard parts.
> > 
> > 
> > Frederic Breitwieser
> > Bridgeport, CT 06606
> > http://www.xephic.dynip.com/
> > 
> > 1993 Supercharged Lincoln Continental
> > 1989 4-Door Softtop Humvee (Hummer)
> > 2000 Buick GTP (Mid-engine track car)
> > 
> > ---