Pulse width and idle quality

[Santi Udomkesmalee]

First of all, thanx for you suggestions on my OBDII problem...Any more 
information would be greatly appreciated.  Right now the whole concept of 
switching computers to a significantly older one, and then trying to first 
make it work properly, and then trying to reprogram it seems a little 
overwhelming right now, and will probably be put aside until I get some 
extra time (too much school work, and too much working on the FSAE car.)

But I do have another question that I hope some of you can answer.  I am 
interested in how injector pulse width affects idle quality, and also how 
fuel pressure affect injector performance (besides lowering the mass fuel 
flow.)  How low of a pressure can you run an injector and still have them 
perform well.  The problem is that I need to inject a lot less fuel than 
before (change from M85 to E85), but I don't really want to have to purchase 
new injectors.  Our current injectors are supposed to be run at 58Psi, and 
we currently run them at 51psi without problem.  But the change to E85 means 
even a lower pressure (higher AF) if we want to stay in an acceptable duty 
cycle.  SO any information you guys can shed on PW & idle quality, and 
pressure and injector efficeny would be greatly appreciated.

-Santi U

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