Twin Turbos (Massive snippage safe to read)

[Bruce Plecan]

----- Original Message -----
From: Frederic <frederic at xephic.dynip.com>
To: <diy_efi at efi332.eng.ohio-state.edu>
Sent: Wednesday, April 25, 1990 3:01 AM
Subject: Re: Twin Turbos (Massive snippage safe to read)


> > I'd recommend ya look for a 749 instead.  Running a 2 bar program would
be
> > MUCH better than a 1 bar.
> I just haven't found one in the local junkyard.  Been looking big time!
Now,
> this particular ECM drives eight injectors, or does it drive a TBI setup
> only?  I thought the latter, however I've been wrong before.

It can run 8 saturated, or 4 Peak+Hold.  There is ver specific wiring for
the two modes of operation.  The www.syty.org or .com has a list of all the
candidates.

> > Sneeze valve for a Truck, might be disaster...  (Doc+Grumpy already
taking
> > bets).
> Actually, I'm anticipating this - and all of the statements you made about
> pulsating in the intake plenum due to the sneeze valve opening and closing
> repeatedly will more than likely be true.  My other option is to use a
> wastegate setup, however I just don't have one at the moment.  Ideally,
I'd
> like to use VATS turbos, however they are not to be found in junkyards
<smile>.

OK whatza VATS turbo?

> > wanting a low rpm monster.  It might take a ton of work to
limit/modulate a
> > sneeze valve for this.  Using the Wastegate signal off of the syty 749
would
> Yes, exactly.  I adapted my thinking to low RPM only, hence the 4k cutoff
> point.
>
> > Might think of using a EGR as a spill valve,  would be to be electric
not
> > vac operated (ie newer Digitial type)
> This is a good idea actually... I had not planned to have any emmissions
or
> recirculation anything... vented the old way, since the hood will never be
> opened at the emissions station.
>
> > One think about sweeping statements is that they are usually wrong.
>
> LOL, good point :)
>
> Frederic
>