MSefi.com read only forum (Jan.15,2018)

Hi Guys,

i'll just quickly start off by saying i am new to both these forums and electronic engine managment, most of my history is plain old mechanical with some basics in industrial automation.
i will apologise if this has been covered before but i did put in some search time before posting this.......back to the topic at hand.


I have nearly finished my latest project an old Cortina with a ford 250ci crossflow motor (aussie motor).
It's still carby mixed, but I have been looking into adding some sensors to do some data-aquisition for me as well as have some outputs to control some of the car's functions.
primarly when i take a few 1/4 passes so i can get an idea of how the engine's doing with my current tune. hoping i can build something to take the guess-work out of the mix.

what i have in mind is to add several inputs such as MAP,o2, exhaust gas temps, ambient temp, altitude, barometer, throttle position (may have to just wack a rotary pot on the carby), tach, crank angle, various temps and pressures ect.
as for the output side of the fence, it'l be pretty simple, electronic fuel pump (digital on/off), thermo fan and water pump control, perhaps fuel pressure regulator control,

i realise i have a lot of homework ahead of me and i'm starting down that road shortly but i was wondering if using a megasquirt system would meet what i'm trying to do or am i better just knocking up a program and wack a input/output to usb box together and hide the o'l laptop under the seat.

Welcome! A MegaSquirt can certainly be used for data logging and fuel pump control; I'd need to know more about the pressure regulator to see if it could do anything with that.

Hi Matt,

thanks for the reply,and sorry for the delay in mine, no internet at home.....

the fuel pressure regulator i am using is a Holley PART #: 12-803BP,
to tune it's pressure output it has a hex locking nut located on a socket head grub screw, i was thinking of removing the locking nut and machining up an adapter boss and then putting a rotary actuator on there to drive it, i have modified my regulator from standard to operate at higher pressures but this is only a very tiny bit of extra torque required during adjustment, im confident a small rotary actuator will have enough power for the job.

i'm waiting on several actauator manufacturers to reply to my requests on their controler input/output arrangement (not sure if they use a potentiometer, pulse count, or a transducer)

This doesn't sound doable with current firmware.

The MS3 (covered on MSExtra.com) has a closed loop fuel pressure control feature that pulses the fuel pump to control pressure.