Pete,
I like your idea about using a PIC to make your own ign. Unfortunately I
have pretty much gone from carbs to factory EFI, so I don't have a lot of
experience in this area.
I'm not even sure of the max advance. Sorry I'm not much use! Someone from
the list running programmable EFI on a Z18 should be able to help you with
some figures to get you started. Guys???
If you get no replies on this please email me privately - I know a guy with
an EMS or Wolf (can't remember which) on a Z18. I may be able to get some
figures from him, although his is starting to approach the "heavily
modified" category now.
'later
PL
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]] On Behalf Of Peter and Trace
Sent: Monday, 24 April 2000 20:02
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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