Mazda Rotary Club

General => General Technical => Anything Engine/Performance/Tuning related => Topic started by: stocky on October 27, 2010, 08:47:16 PM

Title: power fc and injectors
Post by: stocky on October 27, 2010, 08:47:16 PM
ive searched and not come across a definate way to do it
ive got high impedane 850cc injectors and low impedance 1590cc injectors
what is required to get there to work properly or does anyone have a good link to a write up on it??:3Confused
Title: power fc and injectors
Post by: a.tapos on November 03, 2010, 02:58:59 PM
this may help cant remember where its from but its a good explanation
 
like my 1600s are peak and hold. Saturated injectors work using a steady current to open them. They are a
little bit slower to open. Peak and hold type will usually have a lower resistance and work by having a quick zap of
high current to open them quickly, and then the current drops down to hold it open. These are faster, but require the
proper EMS to run them. The problem is that a lot of us are putting the 1600 cc/min peak and hold type of injectors
in our cars and then expecting the saturated-type PFC to control them properly. If you just try to plug the peak and
hold 1600s into your PFC and go, you are putting a lot of current through the driver circuits in the PFC because they
were not designed to work with the lower resistance peak and hold injectors.
To protect the PFC, most people wire a resistor in series with the new low resistance injectors. This will help
limit the current flow. The one downside to this is that it will cause your peak and hold injectors to open more slowly
than they were designed for. Many people use one 10 ohm, 10 watt resistor per low resistance injector. I use a 10
ohm, 20 watt resistor because I’m conservative.
Title: power fc and injectors
Post by: stocky on November 03, 2010, 06:10:36 PM
ive been told by a few people to wire 10w 3ohm resistors to 4X & 4Z on the pfc connector block