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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