Aerochargers etc: real back pressure numbers

[elcamino73]

Don't believe I got the room. I'd like to but my car already scrapes the
exhuast
 on rough roads. (73 Elcamino 377 CID /400 block lowered 2")  Any
suggestions on engine building for 11-15 psi intercooled ATI D-1? Engine
coming out this month to get built and blown. Already have AFR 195 CC heads!
----- Original Message -----
From: "Bruce" <nacelp at bright.net>
To: <diy_efi at diy-efi.org>
Sent: Saturday, October 16, 1999 10:43 PM
Subject: Re: Aerochargers etc: real back pressure numbers


>
> 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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