Aerochargers etc: real back pressure numbers

[elcamino73]

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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