ok im still kinda confused as to the high/low impendice injector thing...what are the stock secondaries..high right? so would bosch 1600 be plug and play (with the custom fuel rail+tuening ) with the pfc?
thanks

 

pleez...someones got to know

 

i think they are. you can check it when you get them

 

No, from what I have read they are neither side feed not low impedence so they are not plug and play you would need a modified fuel rail or a modified intake manifold with an extra rail.
You can get new 1200cc injectors for $200, send your 850's in to get bored to 1300 for $150 or buy some used 850's for $100 or so and replace your 550's with them.

 

yea alredy know where im gettinthe fuel rail..and yes they are top feed..and how imrunning the fitings/ sx regulator....all i needed was if the stocks were high independedce or low...but thaks for your help...sorry what i meant by plug and play was vauge..i mean plug and play as in will they fry my pfc or do i need a resistor...
gues ill have too wait till next week when i pull the engine to find the resistance of the secondaries...

 

The stock injectors are high impedence, and the stock computer and PFC are both "saturated" drivers. The only 1600 injectors that I have seen are low impedence for a "peak and hold" driver circuit. However, lots of people have installed a resistor inline with the low impedence injectors and run them successfully with a saturated driver. I think Mazda even did this as I think I remember some T2s having a resistor pack for the injectors.

That is the long answer. The short answer is that you need to wire some resistors of the proper wattage and impredence in series with the injectors.

Does anyone know the proper wattage and resistance for the resistors? I think low impedence injectors are 2.5 ohms, but I don't remember what the stock ones are - 10, 12? Just subtract 2.5 from the stock value to get the ideal resistor value.