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beepbeep beepbeep is offline
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Join Date: Jun 2001
Location: Sweden
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Originally posted by kellcats521
Just remember that a 1600cc injector is low impedance, and there is no comparison WRT short PW operation between low and high impedance (700 cc Siemens). At 700cc you are on the ragged edge of high impedance use, and low PW operation will suffer. Low impedance injectors by nature will perform better at short PW, so it's not out of the realm to have better idle characteristics in a 2.0L 4cyl with 1600cc injectors than in a 3.3L 6cyl with 700cc injectors.
Well I assumed that his 700cc injectors indeed are low-Z injectors. Frankly, I newer saw hi-Z injectors bigger then 500cc altough I heard that MSD had some special designs for sale.

There are lot's of factors influencing idle quality. To mention a few:

1. Cam timing
2. Injector design (pintle/disc)
3. Injector impedance
4. Intake design
5. Injector placement
6. Sequential/batch?
7. Injection phase.
8. Spray pattern

All in all, I still believe that 700cc low-Z injectors should idle properly if everything else is OK. Even in batch mode.
Thank you for your time,
Old 06-15-2007, 09:14 AM
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