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

[Diehl, Jeffrey]

I've had many of the same thoughts as you seem to be having.  I have a very
similar engine to yours.  I have a 7aGe with the ECU from a 4aGe.  I've
looked at the schematics at great length, too.  ;^)

One thing I thought might be cool, if you could program it... would be to
use larger injectors and have the ECU run in sequential mode at idle and up
to a given RPM.  Then, after that RPM range has been hit, you run in batch
mode so that you get the valve cooling, and fuel volume that you want when
you get nasty with this engine.

The sequential mode would allow you to run bigger injectors and still get a
nice smoothe idle which doesn't offend the nose.  But, at higher revs, you
would be able to supply as much fuel as you could possibly need. ;^)

Just a thought...

Mike Diehl.
'87 MR-2, 7aGe.

-----Original Message-----
From: Nicholas Parker
To: diy_efi at diy-efi.org
Sent: 9/28/2001 9:17 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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