CFI on a 200

[XFlow_Fairlane]

well now that I have my car back home I am going to start my CFI swap on it. I am going to disable the wastegate on my car so no boost but want to see if I can get it running on the stock CFI bits.

I need to get a refresh kit for the CFI unit sinceI need to clean it up a little and drill/tap for NPT on the fuel lines.

Mean while I am going ot start getting it wired up and get the TFI dizzy in the car and see if it will run on it.

The CFI uses a two piece casting with the lower section holding ONLY the throttle plates and TPS. IT LOOKS like it could be opened up ALOT for some more flow if needed. I am not sure about getting bigger injectors that can fit it though (might look into seeing if it can be modded for bosch style injectors)

the airfilter housing uses a larger opening than the 2300 series carbs though so I will need to deal with that.

 

[ASMART]

keep us updated. You will have to write a 'sticky' when your done.

 

[fordconvert]

Which throttle body are you starting with?

 

[XFlow_Fairlane]

I have a 3.8L tiwn plate TB and it will be replacing my 350 holley on a clifford adaptor. it should just bolt on the motor aside from teh housing difference.

 

[fordconvert]

Have a picture of that TB? It has 1 or two injectors in it? It has more or less the holley 2bbl mount?

 

[XFlow_Fairlane]

it is a holley 2bbl mount and uses two injectors. I can get pics next week when I get back in town. since the lower half only houses the throttle plates I really think this thing could flow some air if opened up for a bigger set of plates.

 

[fordconvert]

I would like to see the pictures. I have a Tempo body now but I was starting to have some doubts about the capacity of a single injector. I think the trick is to have more injectors so you dont need as much range in a single one to get the range you need to take a motor from idle to wide open. A single 80-90lb injector should be enough for a stockish 200 but I wonder how well it would idle. I dont even know if there is a 90lb injector that would fit the tempo body. 2 injectors would solve that issue.

 

[80Stang]

Don't know how different the 3.8 unit is but here are a couple of bad pics of early '80s 5.0 CFI throttle bodies:

http://www.ponikorjaamo.com/ti80/efi.htm

Got a lot more pics if somebody wants to see. That 5.0 unit is very easily found on early '80s 5.0s. I have read here on the forum that it would flow only up to 150hp n/a.

It has a Holley 2V mount but there are going to be valve cover interference issues if used directly on the 200 log. I didn't know the air filter housing has a bigger hole so I had to go to the garage and measure....a housing from car the TBI comes from should be adaptable.

 

[XFlow_Fairlane]

80..

I know th eflow isn't the best on them but it looks like one could easily bore it out and put in some larger plates (or a single large one?)

maybe I will see if I cna get it on the car and it fired up this week.

 

[XFlow_Fairlane]

well I had bad luck today looking for a 3/8" npt tap. hoping to find one this week and get this CFI unit buttoned back up. but good news on teh EFI front....

have the TFI dizzy in the block and the coil half mounted to the shock tower (need to pick up some self tapers and a coil wire) I have a spare pigtail so going to wire it up to the 6btm box with no EFI for now and just get the car running on a TFI dizzy. once that is done I can splice it back into the efi harness and get rolling on that (would like to make sure I have spark at least)

I also picked up a second CFI unit off a 302 today along with a 4.6L PS pulley (lighter weight but needs modded) and a FULL nearly complete 3.8L port injection setup (everything but injectors and throttlebody) along with some rockers off a 3.8L for a whopping $40 today.

so if the eweather holds this week MAYBE I can get the car running on the TFI setup and maybe even CFI.

 

[XFlow_Fairlane]

ok picked up my cfi rebuild kit today....turns out the 5.0L ones had an electric choke on them for high idle. mine is missing it but I think it is a messed up deal putting an autochoke on a TBI setup.....weird....

 

[80Stang]

ok picked up my cfi rebuild kit today....turns out the 5.0L ones had an electric choke on them for high idle. mine is missing it but I think it is a messed up deal putting an autochoke on a TBI setup.....weird....

All my four 5.0 CFI bodies have autochokes. So far haven't seen one with manual.

 

[XFlow_Fairlane]

the 3.8L one doesn't use a choke at all just a high idle solenoid.

 

[XFlow_Fairlane]

alright some progress. I tapped a couple holes I needed filled on the top half of the CFI unit. turns out the stock return line is 1/4" npt thread so a simple plug went there for me. I need to fill the old hole from teh regulator and drilll back through it so looking at my options there (want it metal no epoxy since this is a high pressure fuel line)

everything else went good on it. I opened up the fuel passages to 1/4" all around (were about 3/16") once I get this last hole plugged and blow it all out real good it will be ready to assemble and put on the car.

mounted the TFI coil to the shock tower today (had pilot holes drilled already just needed some bigger screws for it)

for now I am going to wire up the TFI dizzy on the CFI harness with an MSD box wired in. I cna do this and only wire the car once to test the TFI on the carb and then I can add the sensors to it and the ECU and have it control timing and if that works out ok then I can add in the CFI unit and give it a shot full bore.

 

[XFlow_Fairlane]

got the TFI coil running on a stand alone harness today (just a temp setup) but it is working!!! new is to wire up the CFI computer and have it introduce a timing curve and see how that works and then put the CFI unit back on the car.

 

[XFlow_Fairlane]

well I had a slimmed down factory harness I was going to install. my EE tech buddy came over adn we got to talking and ended up de-pinning the whole harness to to a proper install. we started out thinking we would jsut run some power and see if it would run on the ECU for timing only and use a carb to just make sure the ECU was functional by seeing if the timing was moving.

Well we got started and with the whole nest of wires we figured we should just take the time and do it right. so we mounted sensors on the motor and started routing wires and layingout the setup. looks like it will be mostly a stand alone harness that will plug back under the dash to the ignition switch for the run/start feeds. so far it is coming along well and might be able to fire it up this weekend (3 day weekend for me and should have a CFI unit rebuilt ready to drop on tonight/tomorrow)

I am planning on running an MSD 6BTM box with this setup and MINIMAL boost (8psi on a 8:1 motor with bigger than stock injectors in the CFI unit and timing WAY retarded)

I still have a dead 3rd gear in the T5 so the extent of test driving will be a lap or two around the block. I have two CFI units (might be picking up a third this weekend) and one is modded with no internal regulator (I have a nice external one) but for testing I am going to use a second with a stock reg in it.

I am pulling power off the starter solenoid, across the radaitor to a fuse block on the drivers fender with a relay on it to power the ECU and coil (this will give a short run for the coil power) so basicly over the nextcouple of evenings I am going to pull some more wires and try and get the ECU mounted in the car with the MSD box (both going under the dash)

 

[XFlow_Fairlane]

taking a break for some dinner here in a bit.....

but cut out my ECU mounting plate earlier. need to deburr it a little and drill some holes and paint it up and it is ready to go then. I'll post pics later tonight but it sits on top of the heaterbox with some velcro and will bolt under the dash lip. the MSD retard box will be visible under it but will also face the pill at the seat for easy swapping. on top of the plate will be a stock EEC4 mount bracket (need to pick that up still) but plenty of room for it all.

wiring will poke out smack dab in the middle of the firewall so all the wiring can run straight out to the engine. one group of wires will run along the drivers fender to power the coil and tap into the main power supply (I am mounting a dedicated fuse/relay block at the drivers core support to supply the ECU power, coil power (one its own circuit) MSD power and engine power (injectors and O2 heater)

as stated we just took the factory harness fully apart and basicly split off each plug (there is no bulkhead connector on a CFI harness) for each sensro or output and mounted them on the motor and are just pulling each one at a time and taping up the excess (incase I sell this off and someone needs longer wires)

only sensor that I have problems with mounting is the air temp since I only have 1/4" npt holes on my intake. just going to weld a bung to the charge tube to mount it...for now just hanging loose.

tomorrow or this weekend my EE tech and I are going to pull the wires and see if we cna breath life into it (first checking for ECU power and timing controll then will swap in the CFI unit itself for full timgin and fuel contorl)

we printed out a wiring diagram for the ECU and already pulled th e"uneeded circuits" out (egr, knock, etc)

I might try and finish up the night with poking the firewall hole and starting to pull wires .

 

[XFlow_Fairlane]

everything is kinda at a standstill with the 100* temps here.

but last weekend hit the yard looking for more CFI junk. ended up scoring a HO 302 CFI unit (with the 52 lb hour injectors) and airlceaner.

found a partially stripped 3.8L stan gI might grab the ECU and harness from for buiding up a second harness/setup if it all works out.

 

[XFlow_Fairlane]

well the ECU is wired in partially now. need to power th einjectors still but gonna try and fire iit up on a carb with ECU controlling timing tomorrow. if it works then the CFI unit will be swapped on.

 

[fordconvert]

I think I read somewhere that you shouldnt run injectors too long without fuel because thats how they are cooled. Seems logical. Just thought I would mention it incase you had not thought about that.