Aerochargers are better than a twin screw!! hahaha ;-)

[Programmer]

Since I said it, I meant a turbo requires no parasitic draw from the engine
to operate it==free HP.

Twice the exhaust BP than boost pressure ? So you're saying your exhaust has
30 PSI backpressure ?

Lyndon.

----- Original Message -----
From: "Jeff Meager" <jmeager at bigpond.com>
To: <diy_efi at diy-efi.org>
Sent: Monday, October 15, 2001 3:37 AM
Subject: RE: Aerochargers are better than a twin screw!! hahaha ;-)


> And what about the losses that a turbo causes due to the horendous
> backpressures.....  you're not going to tell me turbo's are free
horsepower
> are you???  The T88 on the 2.2L nissan engine I worked on that's putting
out
> 732hp at the wheels doesn't suffer the backpressure fate, but it also is
not
> making any real boost until 5500rpm.....
>
> But a turbo that is on boost at 15psi, has on average, twice the exhaust
> backpressure, than boost pressure....
>
> LJ
>
> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> Behalf Of Jess Gypin
> Sent: Saturday, 20 October 2001 9:52 AM
> To: diy_efi at diy-efi.org
> Subject: Re: Aerochargers are better than a twin screw!! hahaha ;-)
>
>
> And suck 10-15 hp from the engine in parasitic loss to drive the blower.
>
> Jess
> ----- Original Message -----
> From: "Stephen Andersen" <SAndersen at advan-tek.com>
> To: <diy_efi at diy-efi.org>
> Sent: Sunday, October 14, 2001 18:31 PM
> Subject: RE: Aerochargers are better than a twin screw!! hahaha ;-)
>
>
> > The boost curve for the Positive Displacement SC
> > on aerocharger's web site is about as far from a
> > "fact" as you can get.  When sized and "geared"
> > properly for a give displacement engine, a PD
> > supercharger will provide within about 10-15% of
> > peak boost given WOT at somewhere just off idle.
> >
> > The twin screw compressors have extremely high
> > volumetric efficiencies and don't need to be spinning
> > very fast to generate boost.
> >
> > Aerocharger's site indicates that the boost curve
> > is linear and starts at or near zero.  Way off base...
> >
> > Steve
> >
> > Stephen M. Andersen, P.E.                              (302) 326-6405
> > Technical Director                                    FAX  (302)
326-6401
> > AdvanTek International, LLC                     Cell   (302) 547-9842
> > 56 Read's Way                               andersen at Advan-Tek.com
> > New Castle, DE 19720
> >
> >
> > > -----Original Message-----
> > > From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> > > Behalf Of Greg Hermann
> > > Sent: Sunday, October 14, 2001 8:36 PM
> > > To: diy_efi at diy-efi.org
> > > Subject: Re: Aerochargers are better than a twin screw!! hahaha ;-)
> > >
> > >
> > > At 7:15 PM 10/13/01, Nicholas Parker wrote:
> > > > What a load of crap at http://www.aerocharger.com/tech1.htm
> > > >My little ol' 1600cc  MR2 with its cruddy 'two-lobe' Rootes
> > > SC makes 10psi
> > > >at 3000revs when max is only around 11.5 (by drive
> > > ratio...),  even the
> > > >turbo boost curve is not very fair to turbo-heads!!  Who
> > > ever drew those
> > > >graphs has probably got holes drilled through his SC lobes
> > > and in hs turbo
> > > >compressor housing!!
> > > >Nick.
> > >
> > > Whatever makes you happy. Don't let facts confuse you!
> > >
> > > Greg
> > >
> > >
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> > >
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