ECU for 14k rpm V8

[Matt Beaubien]

Eric,

As Bruce mentioned, there may be a TB after the turbo, though I somewhat
doubt it as I don't think they had electronic TB's in those days...

The turbo could have had a different style of seal that doesn't pass oil
under vacuum.  There's factory cars out there with carbs/TB's before the
turbos.

One advantage to the TB before the TB is perhaps less lag after lifting the
throttle?  Think of what happens when you block the suction to a vacuum
cleaner--the electric motor speeds up because the mass flow rate has gone
down.  Thoughts?

Matt.


----- Original Message -----
From: "Eric Fahlgren" <efahl at adams.com>
To: <diy_efi at diy-efi.org>
Sent: Thursday, September 27, 2001 8:33 AM
Subject: Re: ECU for 14k rpm V8


> Axel Rietschin wrote:
> >
> > > Interestingly, F1 engines used to be very small-capacity (this is
going
> > back
> > > a decade or two), with less cylinders but with turbocharging. There
was a
> > > particular BMW engine that was, I thinkm 1.5 liters in displacment,
was in
> > > a V-6 configuration and pumped out some 1,200bhp in qualifying trim.
> >
> > ...4-in-line, built by www.mader-racing.com in Switzerland.
>
> I believe that I have a picture of this engine:
>
>    http://members.home.net/pfahlgren/cars/turbo/87_bmw_f1.jpg
>
> I found it interesting that the throttle body is _before_ the
> turbo inlet.  I would think that causing a vacuum in the whole
> intake tract would cause poorer throttle response (anathema
> of a road racing engine), but that's only a guess.  Anyone
> got a good explanation for this?  Lower stress on turbine shaft?
>
> --
> Eric Fahlgren                            Mechanical Dynamics, Inc
> efahl at adams.com                          Ann Arbor, Michigan, USA
> --------------------------------------------------------------------------
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