Fw: Supercharged 3800

Sat May 2 01:28:22 GMT 1998

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Peter:

It does indeed make a difference wether it is upstream or downstream...all
of which depends on where the sonic bottleneck is.  If the TB is the largest
pressure loss (area of highest characteristic Reynolds number, converting
potential energy to kinetic rotational energy), then you want an upstream
"push" instead of a downstream"pull".  This, again, assumes you do not want
to change your TB size.  If you would go with a larger TB, you can get
massive gains both ways.  If not, like I said, it would be better upstream.
For any given restriction, raising upstream pressure continues to increase
mass flow across said restriction with no asymptote.  On the other hand,
lowering downstream pressure continues to increase mass flow UNTIL the flow
is sonic or "choked".  After the flow is choked, you can hook up an 5000 HP
industrial vacuum blower on the downstream, and nothing more will happen.
Again, I stress that this is assuming you dont change area of said orifice
(TB).

All the above also depends on where you are in the load/speed range.  For
example, if you are at low RPM but high TPS, then your intake charge
produces little mean velocity across the TB.  An S/C downstream WOULD be
beneficial BECAUSE the flow across the TB is nowhere near sonic.  But...as
you increase RPM and the speed across the TB increases, your blower would
have less and less impact.

I tried to cram alot in this note...sorry if it all kinda runs together.

Thanks for the chat.

Wayne Strasser
Chemical Engineer
EFI Patent Pending

-----Original Message-----
From: Peter Jaramaz <pjaramaz at ingenico.com.au>
To: 'diy_efi at EFI332.eng.ohio-state.edu' <diy_efi at EFI332.eng.ohio-state.edu>
Date: Thursday, April 30, 1998 10:15 PM
Subject: RE: Supercharged 3800

Thanks for the reply,

What would be the difference if the SC is mounted downstream (i.e after)
compared to upstream (i.e before) the throttle body - to me it seems almost
the same i.e interms of throttle body restriction, 10 psi vaccum after the
TB vs 10 psi of pressure before the TB would result in the same flow across
the TB.

For me, mounting the SC after the TB would make for a cleaner install.

BTW to all those interested, I can get the Eaton as fitted to the S/C 3800
for AUS$950 across the local parts counter.

Peter

----------
From: Strasser
Sent: Friday, May 01, 1998 4:14 PM
To: DIY
Subject: Fw: Supercharged 3800

If you mount your S/C downstream of your TB,  it seems you will see little
top end gain unless you increase your TB size.  Once the pressure drop
across your TB reaches a maximum (in fluid dynamics terms, this is the
point
of "choking" -- sonic flow of a gas), it can "flow" no more...no matter
what
is pulling on the other side.  For example, in carbureted applications, the
installation of a roots type supercharger under the carb, requires
increasing size of carb.

Wayne Strasser
Chemical Engineer
EFI Patent Pending

-----Original Message-----
From: TBK <terryk at foothill.net>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Tuesday, April 28, 1998 9:23 PM
Subject: Re: Supercharged 3800

The Eaton M-62 is ~$1700US new $1300 rebuilt. M-90 a little higher. Contact
www.eaton.com

TK
-----Original Message-----
From: Peter Jaramaz <pjaramaz at ingenico.com.au>
To: 'DIY_EFI' <diy_efi at esl.eng.ohio-state.edu>
Date: Tuesday, April 28, 1998 4:27 PM
Subject: Supercharged 3800

>Hi all,
>
>Q regrading S/C 3800.
>
>In Aus thay're fitted in Holdens. Drove one on the weekend in a LWB luxo
barge Statesman and was extremely surprised by the grunt as well as the
linear power delivery.
>
>Now, wanted to force induct my own earlier 3800, questions I have is if I
mount the S/C between the engine and throttle body (with the MAP sensor on
the throttle body), can I get away with running a 1 bar/atmo MAP sensor as
the MAP would never see boost.
>
>My only concern is the MAP may be subject to too much vacuum under hi
rev/lo TPS.
>
>Would this cause a problem?
>
>Any comments suggestions?
>
>Anyone Stateside know the price of a factory S/C for a 3800 - a local
importer here has a new one but wants $1800. I can buy a brand new complete
engine from Holden for approx $5000, which makes the $1800 for a bare S/C
seem a little high :-(
>
>
>
>

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