Fuel Injection computer

[Cool Hand Lurker]

Just thinking here, not necessarily going to put FI on my flathead but I was wondering if anybody makes a simple automotive computer to control just the fuel injection system. We have modern electronic distributors available but is there anything comparable to use for controlling an aftermarket fuel injection system on the older motors?

[JSeery]

They do, it is refered to as a standalone system as far as I know.

[barnfind]

there are some videos on Utube
search for Flathead EFI

[Ol' Ron]

The throttle body Fuel injection system, isn't much better than a well tuned carb. It does have one advantage, It compensate for altitude. what the flathead really needs is a computerized ignition. However, Megasquirt has a unit that replaces the early Ford unit (87/93) or there abuts, It replaced ate throttle body system with a multi port system, and the ignition, for only $350. I've only read about them, so have no idea how they work, but they improve the performance of the 302 /351 Ford.. If I wasn't involved with the roadster project, I'd jump in.

[Cool Hand Lurker]

Thanks, Ron. I just checked out the Megasquirt. Too far over my head to even think about taking on! Carbs are looking much better now!

[mrtexas]

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I tried this one on my 41 flathead: http://fitechefi.com/products/30003/ Didn't work because I think the hp was too low. Not much support from the company either. Works great for modern v8s however. They have since come out with a 2 barrel version.

This unit looks just like a carburetor and has a built in computer and some sensors. Very few wires to clutter up the engine bay. Only wires are O2 sensor, water temperature sensor, ignition and un-plugable hand held small control screen. Does not control the distributor.

I also have an older more stock GM style throttle body setup with a maize of wires and a large ECU computer that has to be mounted somewhere. This one did control the distributor.

[mrtexas]

https://www.alkydigger.net/proddetai...HIL239F8A%2FEL

[cmbrucew]

Holley makes one. May need to adapt for flat head.

Bruce

[40 Deluxe]

Originally Posted by mrtexas

I tried this one on my 41 flathead: http://fitechefi.com/products/30003/ Didn't work because I think the hp was too low. Not much support from the company either. Works great for modern v8s however. They have since come out with a 2 barrel version.

This unit looks just like a carburetor and has a built in computer and some sensors. Very few wires to clutter up the engine bay. Only wires are O2 sensor, water temperature sensor, ignition and un-plugable hand held small control screen. Does not control the distributor.

I also have an older more stock GM style throttle body setup with a maize of wires and a large ECU computer that has to be mounted somewhere. This one did control the distributor.

One problem I see with this system is the use of 62 lb. injectors. To get the right mixture at low speeds and throttle openings, the injectors have to open and close too quickly for accurate fuel control. smaller injectors require a longer 'on' time so are easier for the ECM to control. Four 62 lb. injectors add up to 248 lbs. of fuel per hour. An '80's-'90's 5.0 Mustang had eight 19 lb. per hour injectors for a total of 152. These engines were rated at 225 HP., and those injectors could handle more.
Another problem is the system is out-dated. Speed-density systems with throttle body injection have been replaced with mass air flow systems with port injection for better control.

[JSeery]

Lots of systems out there to try.

http://hilborninjection.com/product/...fuel-injector/

HAMB thread on FI.

https://www.jalopyjournal.com/forum/...thread.338475/

Hot Rod article.

[mrtexas]

Originally Posted by 40 Deluxe

One problem I see with this system is the use of 62 lb. injectors. To get the right mixture at low speeds and throttle openings, the injectors have to open and close too quickly for accurate fuel control. smaller injectors require a longer 'on' time so are easier for the ECM to control. Four 62 lb. injectors add up to 248 lbs. of fuel per hour. An '80's-'90's 5.0 Mustang had eight 19 lb. per hour injectors for a total of 152. These engines were rated at 225 HP., and those injectors could handle more.
Another problem is the system is out-dated. Speed-density systems with throttle body injection have been replaced with mass air flow systems with port injection for better control.

So you agree? FI can't cut back enough for low HP.

This page says injectors are 4-56# http://fitechefi.com/products/go-efi-kits/

[tubman]

Remember the guy with the 13 second steel '32? He's running FI; I think it's a "home-brew" system though.

[40 Deluxe]

Originally Posted by mrtexas

So you agree? FI can't cut back enough for low HP.

This page says injectors are 4-56# http://fitechefi.com/products/go-efi-kits/

EFI can cut back for low horsepower, IF smaller injectors are used. It's no different than trying to run a 1150 CFM Dominator Holley on a stock 60 HP flathead. You can't just change jets to make it run right. Same with high flow injectors on a low power engine. You can't cut injector 'on-time' low enough and still expect proper mixture control. The system has to be sized to engine output, whether carburetor or EFI.

[Cool Hand Lurker]

I asked the question because I had been thinking of my 1985 Pontiac 4cyl with TBI that ran very smoothly and got over 30mpg and wondered if there was anything like that adaptable to a Model A. I couldn't mention that on the Model A Forum but a lot of you guys have a more varied background. Little chance of "start runnin' and see if yer faster than my shotgun..." (JOKE)

I was right, you do know a lot about what is available. I have also seen smaller systems as used on some of the motorcycles that might work out if they were TBI.

[JSeery]

LOL, there are a lot more issues to address than FI to get a flathead to run anywhere near a modern engine!

[19ED30]

I am very experience In tunning carbs & mechanical Fuel injection and working on modern fuel injetion ( oem ). I am now experimenting With self learing Fast stand alone system ,Also a freind has a MSD set up , these bolt on kits are not just a bolt on & run , yes you can bolt on & it will run , but not correcty !!!! From stock - modified Hot street ,
If you now how to realy tune a carburator You will be $$$ ahead & more reliable,
( stand alone ).

Now a completely programmable Efi useing a Laptop computer , is the way to go
But those kits are $5,000 and up and you need access to wheel dino realy need to know how to tune ,

[Tinker]

Had a buddy that did this on a straight 6 pickup in florida. Back and forth with tuning the msd and EFI. Guess it was worth it. Is interesting however.





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[Ol' Ron]

The injectors I will start with are from the early GM 3800 V6's, Hoping the Monegasque can runt them

[5851a]

Wasn't there someone on here using a escort throttle body injection?

[Ole Don]

Seek information from Mike Davidson from Australia. He sold flathead EFI years ago, the the dollar changed and it's no longer a good deal. He runs Flatattackracing.