Aerochargers etc: real back pressure numbers

[Stephen Andersen]

In my previous lifetime with turbo mitsubishis, I took a car
with a factory tiny turbo, and simply by porting the ex. manifold, turbine
housing and turbine outlet (O2 housing), and putting on a 3" exhaust
with 3" hi-flow cat and straight thru muffler, I brought the 
boost threshold WAY down.

The performance difference was amazing...

Steve


> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> Behalf Of Bruce
> Sent: Saturday, October 16, 1999 3:22 PM
> To: diy_efi at diy-efi.org
> 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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