low impedance injector

dat240zt · Post by **dat240zt** » Sat Apr 22, 2006 2:17 am

I'm very new to megasqurit, I bought a assemble v3 ECU. and will start running my wire very soon. my question is do I need to run resistor in line with my injector, if I'm using the v 3 board. I thought the v 3 came with the fly backboard installed so you would need the resistor. But a friend told me I still have to run them, Is this true. I will also be using the relay board.

Thanks for you help

wedge446 · Post by **wedge446** » Sat Apr 22, 2006 3:05 am

You shouldn`t have to run resistors if the MS v3.0 you bought has the flyback circuit installed.....Set the PWM in Megature and go..
This should give you a better understanding of it.

http://www.megasquirt.info/v22manual/minj.htm#fb

DarrowConley · Post by **DarrowConley** » Sat Apr 22, 2006 7:34 am

Along the same lines.
My car has a factory resistor pack ((2)2k ohm resistors). What will happen if I leave it in? I was planning on removing it from the MS circuit.

Thanks Darrow

PSIG · Post by **PSIG** » Sat Apr 22, 2006 7:48 am

You can leave the factory packs installed and just make the appropriate settings as listed in the link above. MS will work with low or high Z injectors and with or without resistors, although not in every possible combination, like High Z and the wrong resistors.

audibeanss · Post by **audibeanss** » Sat Apr 22, 2006 11:03 am

On a related note, what is a good value to set the PWM value to if using a high impedance injectors on the V3.0 board? (I have Bosch "red top" injectors, 30lb....)

wickedslowAE86 · Post by **wickedslowAE86** » Sat Apr 22, 2006 12:03 pm

high imp. injectors do not require PWM. only low imp (peak and hold) injectors require PWM.
read this:
http://www.megamanual.com/v22manual/minj.htm#pwm

and turn your PWM value to 100% (turning PWM off) for your injectors.