How do you tune an ECU without knock control

[Bruce]

Start with a modest tune, and work from there.
The idea of timing limited tuning, is dated.   Might as well say the engine
is so poorly designed that it needs so much timing to run, or blame the gas,
heck if you just raise the octane 20 or 30 points just think of what you
could do.
On a nitromethane engine is one thing, but for a street car, I'd lay money
on 8 out of 10 cars (ie modified) are running more total timing then they
need to.

The trick is in measuring performance, and reading plugs.   A WB O2 will
help you get there faster.
Bruce




----- Original Message -----
From: "Hugh Keir" <hugh at sol.co.uk>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, October 03, 2001 1:54 PM
Subject: How do you tune an ECU without knock control


> A series of articles by Autospeed  http://www.autospeed.com/ based on Tim
> White's Bachelor of Engineering thesis entitled 'The Effect of Spark-Knock
> on the Performance of a Modern Spark-Ignition Engine' suggested to me that
> maximum power is achieved around the onset of spark-knock.
>
> I have also read other articles that suggest power is still increasing at
> the onset of spark knock, never mind that your engine may be detonating
> through carbon buildup / other overheating malodies.
>
> Motec and Autronic are generaly classed as highly competent systems by
most
> commentators, yet they have no integrated means of displaying / reading
> knock.
>
> This begs the question for a DIY-er with no access to an engine dyno, how
do
> you tune the ignition advance without risking blowing up your engine.
>
>
> ----- Original Message -----
> From: "James Ballenger" <vtjballeng at yifan.net>
> To: <diy_efi at diy-efi.org>
> Sent: Saturday, March 10, 2001 6:59 PM
> Subject: RE: AUTRONIC SM2 ECU.
>
>
> > I have been looking into their unit recently and it is truly a kick ass
> > piece.  I currently have a Haltech E6S-8 and am running into output
> channel
> > problems, I only have 5 and want 10 or so.  I have been talking to Ray
> Hall
> > and the unit is a friggin Motec that costs less than my Haltech.  I
> strongly
> > suspect we will be running the SMC next year and I am looking into them
> for
> > some friends projects as well.
> >
> > If there is a system to judge it by, I started to do the same, it only
> > stands next to the Motec M48 except at a significant discount.  I tried
to
> > compare it to some units like my Haltech or SDS which are both in the
same
> > price range and it blows them out of the water.
> >
> > Sorry to rave about this one, but I am pumped up to get one next year
for
> > our team.  At which point I should be able to provide much more tuning
> > information and specifics.  I have gotten a lot of details about the
> system
> > from Ray, so you may be able to direct some questions at me now if you
> want
> > to.
> >
> > James Ballenger
> >
> > >-----Original Message-----
> > >From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> > >Behalf Of clayb
> > >Sent: Saturday, March 10, 2001 10:55 AM
> > >To: diy_efi at diy-efi.org
> > >Subject: Re:AUTRONIC SM2 ECU.
> > >
> > >
> > >> It seems to be very comprehensive in it's capabilities and
> > >similar to =
> > >> Motec, but are there any technical things like accuracy of spark =
> > >> delivery, fuel delivery, anything else? that can be used to
> > >judge this =
> > >> system against others.
> > >
> > >I don't know the exact pulse width resolution, but I'm sure
> > >Ray Hall can
> > >give you the specs. I use the SMC, similar to the SM2, but missing a
> > >couple inputs and outputs for traction control, idle air, and
> > >some other
> > >niceties.
> > >
> > >It has no problem controlling large injectors (96 lb/hr) at idle. I'm
> > >able to make small corrections in fuel delivery. Ignition is similarly
> > >accurate. I understand they're also coming out with a knock
> > >sensing unit
> > >that will interface with their ECU, and do the usual individual spark
> > >and fuel adjustment. I believe it will also reduce the turbo boost, if
> > >necessary.
> > >
> > >- Clay
> > >---------------------------------------------------------------
> > >-------------
> > >To unsubscribe from diy_efi, send "unsubscribe diy_efi"
> > >(without the quotes)
> > >in the body of a message (not the subject) to
> > >majordomo at lists.diy-efi.org
> > >
> > >
> >
>
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