[Diy_efi] Timing Advance Curve?

[Geddes, Brian J]

Also, is there any rule of thumb about how much extra advace is required =
as RPMs go up?  Say, for example, that an engine had a flat VE from 3000 =
to 7000 RPMs; how much would the timing need to increase over this =
range? =20

> -----Original Message-----
> From: Geddes, Brian J=20
> Sent: Monday, December 16, 2002 10:11 AM
> To: diy_efi at diy-efi.org
> Subject: RE: [Diy_efi] Timing Advance Curve?
>=20
>=20
> Any other advice on this?  If a dyno is not readily available=20
> (I have an all-wheel drive car), could one infer a increase=20
> in torque from a decrease in EGTs? =20
>=20
>=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.
>=20
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>=20

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