Chris,
THe Z18ET doesn't use an ignition computer and the spark plug fire
simultaneously throughout the rev range. I think the CA20 twinsparks fire
as you described. Another interesting fact I have discovered, the knock
control module retards the timing in an analogue (maybe linear) fashion.
Not just on and off as previosly thought.
Pete.
----------
> From: Chris (CP) <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
> Subject: RE: Ignition timing
> Date: Thursday, 27 April 2000 7:08
>
> noticeabiliy? I cant see it making massive differences. THe factory
> computer cut the second set at 2000rpm anyway
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of malcolm cooper
> Sent: Wednesday, April 26, 2000 7:03 AM
> To: [EMAIL PROTECTED]
> Subject: Re: Ignition timing
>
>
> They dont run as well on four ,they go better on eight.
>
> Malcolm
>
> "Chris (CP)" wrote:
> >
> > i seen people run em with bluebird elec dizzys. Just leave 4 plugs in
the
> > holes ya arent using. doesn't seem to effect em..
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED]]On Behalf Of Peter and
> > Trace
> > Sent: Monday, April 24, 2000 8:32 PM
> > To: [EMAIL PROTECTED]
> > Subject: Re: Ignition timing
> >
> > Pete,
> > You say that the figures in the table are not values in Deg
BTDC.
> What is
> > the maximum advance angle be? I have a Z18ET with a poor dizzy with no
> vac
> > advance and 8 spark plugs. I want to ditch this setup in favour of
> 'crank
> > fired distributorless programmable home made ignition system' using a
PIC
> > microprocessor. I think I will still have to run 8 plugs though ( I
dont
> > want to ).
> > Any help, advice, experience in this area??
> > Regards,
> > Pete.
> >
> > ----------
> > > From: Pete & Kath Liebig <[EMAIL PROTECTED]>
> > > To: [EMAIL PROTECTED]
> > > Subject: RE: Ignition timing
> > > Date: Friday, 14 April 2000 12:43
> > >
> > > Pete,
> > >
> > > As you would already know, there is no "ideal" curve. You gotta get
the
> > > right curve sorted out for your particular engine, given the boost,
> > > intercooling, fuel type and how close to the edge you want to take
it.
> > >
> > > The basic starting point though, is that you can run a fair bit of
> > advance
> > > at low rpm - this is then progressively backed off as you approach
the
> > peak
> > > torque figure (3650 - 4000rpm in the case of the SR20DET). After this
it
> > > begins to advance again.
> > >
> > > Naturally more advance is run at low load and is then backed off as
load
> > > increases.
> > >
> > > I have maps for the standard ECU and some for a "tuned" ECU. The
> standard
> > > ones run heaps less advance - obviously for safety reasons. The
"tuned"
> > maps
> > > make the engine go heaps harder - but you only need a very hot day or
> > > slightly dodgy fuel and the dreaded detonation rears it's ugly head.
> > >
> > > Interestingly, the "tuned" maps run on an engine that is using
standard
> > > boost. It seems there are good gains to be had by running less boost
and
> > > very aggressive ignition timing. This particular engine feels very
> strong
> > to
> > > drive, and doesn't suffer from the peakiness of an SR running
standard
> > > ignition timing and increased (14psi) boost (my car).
> > >
> > > You really need to have it setup properly on a dyno by someone who
deals
> > > with turbos on a regular basis. You can setup curves on NA engines
> > > reasonably well yourself, but turbos are another story...
> > >
> > > I'll send you some info privately - too big for list.
> > >
> > > 'later
> > > PL
> > >
> > >
> > > -----Original Message-----
> > > From: [EMAIL PROTECTED]
> > > [mailto:[EMAIL PROTECTED]] On Behalf Of Peter and
> > Trace
> > > Sent: Thursday, 13 April 2000 17:49
> > > To: Ozdat
> > > Subject: Ignition timing
> > >
> > > Hi everyone,
> > > I am trying to get some information on the ideal/practical
> ignition
> > curve
> > > for a turbo engine. Any help appreciated.
> > > Pete.
> > >
> > >
> >
>
>
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