MS3X with 8 Injectors on 13B
 

Hello

Does anybody know the wiring of 8 Injectors on a 13B engine with MS3X.
I want to use:
2 x primarys front rotor
2 x primarys rear rotor
2 x secondarys front rotor
2 x secondarys rear rotor

with staged injection to control primarys and secondarys.

Injectors are high impendance.
Is it possible to wire 2 identical injectors parallel together to one Injector output?

thanks in advance

i think that ken or james told me a long time ago that you can use 2 hi omhs injectors per channel.

Should work with injectors of high enough impedance. However, why would you do it this way? Why not get 4 properly sized injectors and avoid the extra complication?

he's probably running methanol as fuel, i have seen 13b motors running on 10 2200cc injectors when they are running methanol for fuel and a lot of boost.

yes thats right. we want to use methanol and run 8 of 2000cc injectors (like the 0280158821 -> 9,1Ohms)
Is there another way to wire them?

in parallel?

You can also use external low impedance drivers to allow multiples of injectors on each channel. One of these, for example:
Peak&Hold Injector Driver Board v2.0.1

thanks for the replys.
I dont wan to use another board for controlling the injectors.
In the hardware manual for the MS3XV357 there is written, that the injector dirvers on the MS3X are limited to 5 Amps each. So two 9,1Ohms Injectors on one driver should work or am i wrong?

low impedence have a higher initial trigger threshold of about 4amps then down to less than 2 before closing again.

high impedence injectors generally run less than 2 amps and could be run in pairs off a single circuit.

Well, two 9 ohm injectors in parallel is 4.5 ohms.

Ohms law I = V / R

I = 14 / 4.5
I= 3.11

So yes, should work.

And yes, I realise that's for a resistive load not an inductive load. Numbers are close enough. Inductive load will have an initial spike as the inductor charges, then settle to the value of a resistive load.

be sure to measure your dead time when wired up that way. It'll likely change depending on what the circuit is driving.

ken can something be code to use the extra injectors outputs to drive more injectors on a 13b.

Already is, you can run sequential on the ms3x outs and then batch for the second stage on the ms3 outs.

i mean the output on the ms3x card something like a+e and b+f primaries and c+g and d+h secondaries.

Could be if more than just 1 person will use it :-)

that would be a other nice feature available for the very hi horsepower
cars.

Ill use it this is going ms3x

ben, thanks for the info!
i was thinking of running 2 injectors for water/meth off the trailing signal wires, it would be easy and scale the injectors of water to what the fuel is doing in regards to airflow.(more air-more fuel more water)