injector staging

[Bruce]

It just crushs the lil guys when you spoil their fun like that.
On the Vettes, the hammer the injectors on as the **secondary** air door
opens.
If this is a street car, I'd size the **normally run on** ones to cover all
but PE conditions, and then set all the PEs/TPS, at a level where the PE is
serious enough to need lots of fuel.
I was thinking of something along the lines of running 2 ecms, one for the
low load fuel and timing, and then the second for the secondary injectors.
But, found out by going P+H I can run some large injectors (oh, and it's
SEFI)
Bruce


From: <bill.shurvinton at nokia.com>
Subject: injector staging
> Sorry to interupt everything with an EFI question, but I wondered what
> the rule of thumb was when doing staged injection in terms of when it
> was better to run one injector and when to switch to 2. looking at
> standard injector ramping profiles it would suggest that, once your
> total squirt is around 1ms then you have sufficient accuracy to meter
> fuel (for Bruce: metre is the unit of length=39.27inches), but below
> 0.5ms it starts to get difficult due to injector opening and closing
> times becoming significant.
> Any pointers would be appreciated.
> Rgds
> Bill


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