injection strategies for 4 cyl, port injection (1.6L Toyota 4AGE)

[Bruce]

Most SEFI strategies spray the fuel on a closed valve for vaporization
purposes.

SEFI is most effective (as far as practical design limits go) for low speed
engine operation.  At any high RPM, the injector is on / opening / closing
most of the time anyway.
Bruce






----- Original Message -----
From: "Nicholas Parker" <nrparker at ihug.co.nz>
To: <diy_efi at diy-efi.org>
Sent: Friday, September 28, 2001 11:17 PM
Subject: injection strategies for 4 cyl, port injection (1.6L Toyota 4AGE)


> Hello,
> I'm guessing that ideally with sequential injection, it would be best to
> select an injection endpoint method, so injection alway ends at a certain
> crank angle,  meaning you always inject entirely through an open intake
> valve, until of course the pulse is so long it has to start a bit earlier
> than the valve opens OR would you need much bigger flow injectors to get
all
> fuel through the open valve?
>
> Would there be any problem if I changed this around, and had sequential
> fuelling BUT starting at a certain angle.  i.e. potentially just after the
> intake valve has closed, giving me up to 700ish degrees of time to inject
> for?
> Are there any problems with injecting all fuel onto the closed intake
> valves?
>
> Finally regarding 'acceleration enrichment'  what strategies work?
> Is the additional fuel amount proportional to dMAP/dt ?  Without TPS can
> acceleration enrichment be implemented effectively?  Is the decay
> implemented on an 'injection event basis' or with respect to time?
>
> Thanks for your help.
> Cheers Nick.
>
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