digi 1 vs MS

[jdbubb at ix.netcom.com (Dan Bubb)]

Depends on what car you're tuning.
Mild engine i.e NOT ITB's and normally aspirated, then I think you can
effectively tune with a narrow band sensor.
Wild NA or turbo? I think you need a wide band O2 to tune.

If you don't have a gut feel for what load and RPM points to select for your
VE table and a general idea of what the VE table should look like then I
would suggest you find somebody that does, learn more before jumping in or
pass on Megasquirt (and other aftermarket engine management systems)

There is also the issue of setting up accel enrichment, cranking pulse width
and warm up enrichment. This requires alot of trial and error and a narrow
band O2 sensor isn't going to help much here. Getting the warmup enrichment
right can only really be done once a day, so plan on dicking with it, laptop
in place, for quite a few mornings.

Also, I'd like to point out that engines will run over an incredibly wide
range of air/fuel ratios. So, there's a huge difference between getting an
engine to run on MS and getting the A/F ratio right for idle, cruise, power
and tranisitions.

Going to spend the day again tuning the wild-assed 2.0 8V with ITB's.
Hopefully, the other issues (like KS ignition setup) that caused big
problems last time will have been resolved and we can concentrate on tuning
instead of fixing. So, hopefully, I'll have another data point by the end of
the day.

Download the Megatune software. It will run without an MS hooked up. Take a
look. If the setup, enrichment and VE screens make sense then jump in. If
you're looking at a bunch of gobbledygook then it isn't going to get any
more understandable when it's controlling and engine.

Dan

----- Original Message -----
From: "Rhett Farnum" <rocco_crossing@hotmail.com>
To: <sad_rocc@yahoo.com>; <scirocco-l@scirocco.org>
Sent: Saturday, November 22, 2003 10:03 PM
Subject: Re: digi 1 vs MS


> tuning it a piece of cake! I don't know about initial set-up or super
duper
> fine tuning, but general butt-dyno tuning works awesome! A buddy and I
took
> his Golf out and butt tuned it in about an hour or so.
>
>
>
> Peace Out,
> Rhett
> Rocco_crossing
> '83 Rocco (autocross ready, tune up, install harness, and finally I may
get
> to makeing it look better!!)
>
>
>
>
>
> >From: Dan Smith <sad_rocc@yahoo.com>
> >To: scirocco-l@scirocco.org
> >Subject: Re: digi 1 vs MS
> >Date: Sat, 22 Nov 2003 13:23:03 -0800 (PST)
> >
> >Tuning is a snap? I (think I) remember him saying it was the exact
> >opposite. Granted, I don't have ITBs or some crazy setup, but I thought I
> >remember him saying it took a full day for him to get a rabbit running
> >correctly. Also, I remember people saying that just getting the car to
> >start at first is a trial of patience. I can't afford a day at the dyno
so
> >maybe that's what makes tuning more difficult. Also, I know about the
parts
> >digi and MS share and that's part of my question. (Final cost on MS
> >installation) I'm asking because I'm trying to figure out if it's worth
it
> >to buy all the digi 1 components I need plus MS or if I should just go
> >straight digi 1. The clean bay has me leaning toward MS, but it's
balanced
> >by the ease of a digi 1 swap.
> >
> >Dan
> >
> >Ron Pieper <rapieper@yahoo.com> wrote:
> >Digi 1 and MS use the same fuel rail, regulator, pump, and filter.
> >
> >Dan Bubb has stated several times that tuning MS is a snap.
> >
> >Therefore, the only thing that Digi has over MS is that you have to build
> >MS, and you don't even
> >have to do that, ready-made kits are out there.
> >
> >HTH
> >
> >Ron
> >
> >--- Dan Smith wrote:
> > > I'm trying to decide between swapping to digi 1 and swapping to MS for
> >my turbo projects. Here's
> > > my pros and cons list. Votes with reasoning one way or another would
be
> >much appreciated.
> > > Pros- digi
> > > easy swap
> > > no real tuning to mess with
> > >
> > > Cons-
> > > more expensive
> > > more crap in the engine bay
> > > not customizable
> > >
> > > Pros- MS
> > > cheaper (maybe)
> > > gets rid of a lot in the engine bay, neatens it up
> > > 100% tunable to make the most out of my car
> > > no KS (KS is bad with turbo correct?)
> > >
> > > Cons-
> > > still need to find other parts (fuel rail, sensors, etc)
> > > needs to be built
> > > tuning is a bitch
> > >
> > > So, have I hit the highs and lows of both? What does a complete,
> >installed MS setup end up
> > > costing?
> > >
> > > Dan
> > >
> > >
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