Aerochargers etc: real back pressure numbers

[Bruce]

Two mufflers (single 3" system).
Just increasing the systems volume quiets a system.
Iffa v8 be sure to use a cross or X pipe.
Bruce


----- Original Message -----
From: "elcamino73" <elcamino73 at mindspring.com>
To: <diy_efi at diy-efi.org>
Sent: Tuesday, October 16, 2001 10:03 PM
Subject: Re: Aerochargers etc: real back pressure numbers


> Are you running a total of four mufflers? I am going to four ultraflows,
> kinda wondering how much four will quite down my exhuast note!
> ----- Original Message -----
> From: "Bruce" <nacelp at bright.net>
> To: <diy_efi at diy-efi.org>
> Sent: Saturday, October 16, 1999 3:22 PM
> Subject: Re: Aerochargers etc: real back pressure numbers
>
>
> >
> > Any.
> > The whole *trick* in a street turbo car is the lack of back pressure.
I
> > have about 9' of 3" pipe, and two straight thur mufflers (1-9", and
> 1-14").
> > Turbo knocks the noise level down some (well smoothes out the engines
> bark).
> > Things like Flowmasters, where they redirect the flow, or tamper with
the
> > exhaust energy mess up performance.   The Ultraflows, and ATR Pit bulls
> are
> > the muffler of choice in the GN world.  I run one of each and couldn't
be
> > happier
> > Bruce
> >
> >
> > ----- Original Message -----
> > From: "Walter Sherwin" <wsherwin at home.com>
> > To: <diy_efi at diy-efi.org>
> > Sent: Tuesday, October 16, 2001 5:47 PM
> > Subject: Re: Aerochargers etc: real back pressure numbers
> >
> >
> > >
> > > > Being curious and since I was allready using a 12 channel datalogger
> and
> > > > wb NTK to tune the Typhoon I had just purchased with its new Garrett
> > > > TE-60 turbo, I instrumented the TY with pressure sensors and EGT
> probes
> > > > to measure back pressure before the turbo and manifold (boost)
> pressure
> > > > as well as egt before and after the turbo.
> > > >
> > >
> > >
> > > Insightful info.  Thanks.  I am curious as to whether you had an
exhaust
> > > system downstream of the turbine in your TY during those tests (ie:
> > piping,
> > > converter, muffler), and whether you data logged the EBP at the
turbine
> > > discharge?  Anyone else ever measure this type of thing?  I know this
is
> > > going to sound rather vague, but, what's an acceptable value for post
> > > turbine EBP in a street car before seriously impacting a turbo's
> > capability?
> > >
> > > Walt.
> > >
> >
>
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> >
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