It has struck me that other than the Cossie brake upgrade, there is a question that keeps on getting asked day after day!
"What do I need to convert my MFi RS Turbo to run EFi?"
I propose a Sticky thread on a "Basic" conversion using OFAB or OFAC.
I've done a lot of research into this as I plan to do this conversion myself. Before I start here's a quick list of my references:
www.rsbible.co.uk - Very descriptive, good pictures and diagrams.
www.extraefi.co.uk - A good EDIS diagrams
www.passionford.com Our friendly Forum
www.dainst.com lots of EDIS info
Other sites I may have to add!
Here's my 2p's worth feel free to add, remove or CONSTRUCTIVELY criticise:
You will need:
1) CVH EFi Head (XR2i or Fiesta RS Turbo) or MFI>EFI sandwich plate.
2) Complete EFi inlet (Inlet manifold, throttle body, injectors, fuel rail, pressure regulator, Throttle position sensor, Idle speed control valve and injector wiring loom)
3) ECU and engine Loom (OFAB or OFAC, loom to suit) An XR3i EFi loom can be used with OFAC.
4) Electronic Distributorless Ignition System (EDIS-4 unit, Crank Position Sensor and Coilpack).
5) Suitable HT Leads.
6) Some form of Crank Position Sensor pickup, either:
.....a) A drilled block and EFi flywheel.
.....b) Sierra CVH crank and alternator pulleys with sierra CVH lower timing belt cover and ribbed aux belt.
.....c) A N Other 36-1 tooth trigger wheel on the crank with Crank Position Sensor bracket (Oddkid creations have been mentioned).
7) MAP sensor (ECU Specific).
8) CO2 Potentiometer.
9) Vehicle Speed sensor.
10) Fuel hose from fuel filter to fuel rail.
11) Engine sensors for the ECU type chosen.
12) XR2i or XR3i EFI throttle pedal and throttle cable.
13) Fiesta RS Turbo rocker cover and charge carrier (ERST ones may be used but a bit fiddly).
14) OFAB will need a MAP sensor suppressor
You won't need:
1) XR3i EFi Dash pod and rev counter. Contrary to popular belief you don't need an XR3i EFi Rev counter. If you intend to keep the wiring as it is, the standard output is from pin 10 of the EDIS which is one of the 2 coil drive outputs. This will obviously only give you half the reading of the current revs which the XR3i EFi rev counter can interperate correctly but the S2 one can't as it would need an input from both coil drive outputs. The way around this is to add an output to pin 11 of the EDIS which is its CTO (Clean Tacho Output). There is no pin there on the XR3i loom and I'm not sure about the FRST loom but one can be easily added. I just used a diferent bit on my soldering iron to melt a hole through the back section of the casing, stole a pin from a spare EDIS connector and pushed it through. This was then run as far as the RPM suppressor and plugged directly into the green cable running to the dash bypassing the suppressor and the output from pin 10.
A few things to note:
1) If you want to run anything other than standard settings, the relevant chip and injectors are required (165/195chip, Bosch "beige" 701 injectors).
2) If you want to run more than 1 bar (14.5 psi) of boost, you will have to use an alternative MAP sensor. For OFAB you can use a Cosworth 3 bar MAP sensor which can measure up to 2 bar of boost (1 bar atmospheric pressure and 2 bar positive boost). For OFAC, you can use a Small Turbo Escort Cosworth MAP sensor. This sensor is a 2.5 bar item (1 bar atmospheric pressure and 1.5 bar positive boost).
3) If you want to use an XR3i EFi car & engine loom (1AfA) whith OFAC there are no pinout changes. If you want to use an XR3i EFi car & engine loom (1AfA) whith OFAB visit
www.rsbible.co.uk for the pinout changes.
4) You may get a seemingly low reading from the rev counter. If so run a wire from pin 11 of the EDIS module as described above.
5) If you use the Sierra 1.8 CVH crank pulley you will need the Sierra 1.8 CVH alternator bracket. This bracket needs 5mm machined off the one side to align it with the crank pulley. You will also need a 5mm washer (As sold by Oddkidd creations) to fit between the crank pulley and the retaining bolt.
How to with FRST loom:
I wont make this a full step by step, that would be dificult as there are a few diferent scenarios and would take forever. If you have chosen the correct loom for the ECU then no pinout changes need to be made (Obviously). Thus making neither OFAB nor OFAC harder than eachother.
1) Disconnect the battery!
2) Fit all of your mechanical parts.
3) Fit all of your sensors.
4) Tape back the parts of the original loom not required. Once finished and tested you can cut out and remove any parts of the loom not required if you like.
5) Install the EFi engine loom.
6) Connect the engine loom to the car loom. You will need to do a bit of chopping and changing. This bit can be tricky, but I will re-post this diagram by passionford member
Rab as I think it shows it quite well:
7) Run a wire from the rev counter input to pin 11 of the EDIS-4 unit.
8) Connect up the engine loom to the sensors, cooling Fan, ECU, coilpack, Idle speed control valve and EDIS (Some wires may need to be extended eg. Fan and ISCV).
9) Double check everything!
10) Cross your fingers and fire up the car!
If you use the loom from an EFi XR3i it's even easier, just fit the loom to the car, plug in an OFAC ECU and MAP sensor and you're away. That's my plan:
One almost complete loom, just needs a trial fit and taping up.
I'm not claiming this is complete, but it should answer most of the repetitive questions! and a big thanks to everyone for the info I've gathered.
Lee
