Howard Coleman

iTrader: (6)

maybe it is just my tuning competance but i seem to have been all over the injector lag choices and still have a fuel map that has a huge peak at transition... so i have an FJO injector driver headed my way. and good by to the ballast resistors.

my question is will it disallow my injector duty cycle reading from the Power FC/Datalogit?

hc

SilentRun7

iTrader: (1)

The signal that the PFC would measure for duty should originate within the same low level architecture of the device. From there, the signal would drive the gate for the NPN mosfets, and then onto the injector drivers et al. Therefore, the PFC parameter should not care what exists beyond the low level circuitry, save for a short circuit (which would indicate a duty cycle of zero if it still functioned).

Good choice with the FJO product, by the way

Howard Coleman

iTrader: (6)

thanks for the info. i appreciate your expertise...

i will post a follow up when i fire it up later this week.

since you have knowledge re the inner workings... i run a Power FC and it logs volts to the primary and secondary injectors.... somewhere around zero to 6+. in addition, i can log injector duty cycle.

we are trying to get a feed that we can use to drive an auxiliary injector system (methanol or water or both) that will be based off injector duty.

the problem is the nature of the signal re injector duty isn't a varying voltage. it also seems summing the two (primary & secondary) voltages doesn't correlate w injector duty either. would you have any ideas?

thanks again,

howard coleman

SilentRun7

iTrader: (1)

Howard, you are most welcome.

I have two possibly three solutions for you. I will shortly send you a PM about this.

RICE RACING

let me know how it goes howard, I need the same for my FD

Howard Coleman

iTrader: (6)

i just received my FJO injector driver convertor. my 1600s are going to be smiling



i don't know what's inside the black box but the wire and connectors are first class. FJO was/is? a defense contractor and they build all the racecar stuff to Milspec. considering what we all ask it to do it is probably the way to go.

hc

atihun

I like mine as well; from talking with FJO, they said that the driver doesn't introduce any lag as ordinary inline resistors might.

I have 750's and 1680's and tuned to 16psi. My max injector duty was around 65%, so far so good!

Howard Coleman

iTrader: (6)

all wired and ready to fire:

yes, i will do some wire triming after it is up and running.



hc

Howard Coleman

iTrader: (6)

the FJO instructions are excellent. here's how it matches up w our (FD) wires.

the FJO Peak & Hold Injector Driver can control 4 injectors. you will only use it to control your 2 secondaries.... so you will have some spare wires.

FJO White wire connects to the B/Y common injector wire. cut the B/Y wire 6 inches or so from the injectors, combine the 2 B/Y wires and join them to the white wire. (there are 2 white wires. this White wire comes from the two color wire fitting)

FJO White/Red wire joins the front secondary injector wire which is LG/W.
FJO Red wire goes to the LG/W portion of the wire that runs back to the ECU.

(to be clear.... you CUT the LG/W wire and splice the White/Red FJO to the wire running to the injector and splice the Red FJO to the portion running back to the ECU.

do the same at the rear secondary injector. insert Orange for Red and LG for LG/W.

connect FJO big Red (power) wire to a 12V source. see my picture above. if your battery is still in the engine compartment, connect it to the positive side.

connect FJO Black wire to a good ground.

connect the other White wire and Pink wire together and to the B/Y wire running back to the ECU. (it is a 12V switched power source.)

connections can be made w solder or 3M elec fittings. i wrapped mine w 3M thick elec tape and then reg elec tape.

i was given some preliminary settings from another board member and have yet to tune.

750/1600
.08 lag prim
.40 lag sec
pri/sec transition 36%
secondary transition set at .5Ms

inj overlap
11
7
4


i will update settings (though i run 850 pri) as soon as i get tuning in a few days.

howard coleman

atihun

Hi Howard,

I don't see an inline fuse; I think on mine I was told to put a 15 amp fuse.

Attila

Howard Coleman

iTrader: (6)

note the inline fuse on the red power wire on my installation... it came w the unit.

hc

Ipohboy

iTrader: (1)

Howard,

Thank you for your detailed write up. really appreciate it.

atihun

I was wondering about that connector. Mine did not come with one; I had mine in a box for almost 2 years.

Howard Coleman

iTrader: (6)

someone asked if the unit would run 4 secondary injectors so i asked FJO....

FJO

Here's how the 4 and 8 channel drivers work.

Each channel is totally independent and can be fired with any or all channels at the same time. Each channel can detect if the injector is low impedance and needs to be driven with 4/1 amp peak-n-hold or if it is a high impedance and is driven with straight 12v. This means that an engine with 2 primaries can have the 2 secondaries paired by simply connecting the inputs together. If one wanted to go crazy, you can tie all 4 or 8 inputs together and drive them from a single channel. Further to this, if you float the pink input wire none of the channels will fire, kind of like an arming wire.

In your example, I would wire each injector to its own output channel and connect the inputs together to fire them as pairs.

Note: the outputs will only drive 1 injector per channel, but you can connect many inputs together.

Just as a side note, if anyone is going to order these and is using a bosch style injector ... we do sell the connector ends for that factory like install.
WCK0010 $4.75 ... fits Bosch style injector with square connector

Asleep

Howard,

Thanks for the information. Appreciate your attention to detail and relaying your knowledge back to the rest of us lurkers.

Based on your last message I assume those of us running 4 low imp. injectors should have no problems. Obviously, each input would remain seperate if wanting to control 2 primaries and 2 secondaries. My setup is 2 top feed 870's with 2 top feed 1680's.

Tony

P.S. No, I did not order anything from Florida...yet.

Howard Coleman

iTrader: (6)

YIPPIE, I AM PIG RICH!

i finally am on the road and i am happy to say that as my secondaries came on my AFRs dropped to 10 and my car started blurbling.

that means my FJO unit is working and i can now, finally, flatten the ugly mountains in the middle of my fuel map.

good by resistors, hello FJO.

i will do some mountain flattening tomorrow and post the before and after fuel charts.

hc