[Diy_efi] RE: Diy_efi digest, Vol 1 #413 - 12 msgs

[Patrick Cahill]

Unfortunately, this is about the only way to properly optimise the timing on
an engine. Any form of calculations or even guesses will still be nowhere
near where the timing should be. And to complicate matters further, if you
do take a stab at it and get it wrong, your pistons will never forgive you.
I have seen people try to pick max torque/VE values off of the fuel map with
disastrous consequences.

The stock ignition map will generally be "safe" but probably some ways off
the mark when it comes to optimised performance.


Any other advice on this?  If a dyno is not readily available (I have an =
all-wheel drive car), could one infer a increase in torque from a =
decrease in EGTs? =20


>=20
>=20
> The DIY way is to advance until torque drops, or until it pings,
> whichever is first.  If it pings first, drop it back a notch, or use
> higher octane.
>=20
> If you are talking about a programmable chip, where you can set the
> numbers at each point, it works the same way, except the=20
> process has to
> be done for each set point.  But a rule of thumb is, greater=20
> VE calls for
> less advance, but greater RPM calls for more advance.  The=20
> torque curve
> of an engine at stock is a good starting place to guess at VE.




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