mentalasanything

If your 3i is running EFi you are laughing. You will just need the obvious mechanical parts, a Fiesta RST OFAC ECU, matching MAP Sensor and a Fiesta RST Air charge temp sensor.

OFAB and OFAC are the two variants of the Fiesta RST ECU. OFAC is wired exactly the same as the 1AFA ECU that is in yuour XR3i so it's a straight swap!

Lee

Blunt.RS

iTrader: (7)

Your are a true gent sir thankyou very much
So basically i dont need to change the wireing or anything just plug and play LOL

mentalasanything

If you want to use the OFAC variant of the FRST management then no wiring changes are needed. Just plug the ECU in, drop in a FRST engine with all the FRST sensors, plug it all up and you are away.

If you want to use the OFAB variant of the FRST management there are a few pin changes to be made at the ECU end and a supressor is required for the MAP sensor. Nothing major but must be noted!

Glad to be of assistance!

Lee

Epsilon23

Hi, I'm thinking in to fit a FRST engine in my ERST S2. I have already a complete FRST engine and I'm wondering in to buy a OFAB engine loom. Well, my question is how to connect this fiesta engine loom to the standard S2 wiring. I have readed a lot of information but always the author speaks about XR3i loom. Do I need really use anything from Xr3i or can I do the conversion only with FRST engine and loom?

mentalasanything

You can use a FRST loom. The wiring diagram at the top of the thread shows you how to wire it up!

Lee

Epsilon23

Do I need only to add the inyection relay circuit? Or standar fuel pump relay circuit is necesary to be modificated too??

I know that I have to run a wire from the rev counter input to pin 11 of the EDIS-4 unit. Is it the same signal of the pin 3 in the multi plug engine loom? It is probably an stupid question but it is difficult for me to understand everything in english.

Thanks.

garyrsts2

ok heres a retard question. can some one explain the advantages of the efi to the mfi? mines is mfi and id be interested in converting but seems alot of work. would like to know the advantages should i decide to do the conversion. if some one could pm me id be greatful

Rogeyboy

iTrader: (2)

Sorry to dredge this up again... But...?

Ive done exactly as this guide states, converted my EFi Orion to EFi Turbo using OFAC ecu and sensors etc and it doesnt run properly... I don't think it's as simple as plug and play!? The fueling was all over the place and the ECU would not respond to changes made to fuelling via the CO Pot and Fuel Pressure Reg...

Is there some variations in the XR3i/XR2i and Orion EFi looms?

mentalasanything

Here's a wiring diagram for a Fiesta Turbo:



Double check your wiring compared to that.

Lee

Rogeyboy

iTrader: (2)

Is that a simple job?
Im hopeless with wiring, i haven't got the patients!

mentalasanything

Well it should match your current loom. Item 7 on the diagram is the co pot so start there and work through the other connections to the ECU.

Lee

Epsilon23

Hi,
We have fitted a rebuild frst engine in my escort, but I have some questions :

Which throttle cables and pedals can I fit? Xr3i, xr2i,... Can I take them from any Zetec?

Cheer

paul xr2

You need to use a mk4 xr3i efi throttle pedal and cable mate

Epsilon23

what other ford models can I get the throttle pedal and cable?

Anyone knows their finis code?

Epsilon23

Hello,

I have followed the wiring diagraman showed in this post and I have problems with the injectors' signal in the connectors. How is the signal I should mesured in them? I have disconnected the fuel ramp conector and I have measure continuity between 2 pins of injector's connector. Is it normal? Have I got a short circuit?

Thank you for your help.

rscombiman

well does any one have a metering head for a mfi pleas help me

studabear

try looking in the rs turbo parts for sale section

mentalasanything

Whilst building my engine, i have found a few little extra bits. So, I have done a small update to the main post.

I found that 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.

Also, I've done a lot of reading about MAP sensors. It turns out you can run more than 1 bar of boost using OFAC. You can use a Small Turbo EsCos MAP sensor to run up to 1.5 bar of boost. Not as much as the 2 bar you can run on OFAB, but better than first thought!

Lee

stafcio

hi there,

im on my way to convert to efi. have almost all parts installed, but i have wiring issue.
it seems xr3i mk4 loom isn't straight swap. i have to chop and connect more than two cables: reverse light, temp gauge sender, temp sensor, iscv and some others.
is it correct or i have been cheated with loom? is there any wiring diagram for xr3i mk4? i have almost all manuals but i can't find this wirings.
if there isn't one can someone tell me what wires excactly need to be extended?

is it the solution?
Now using OFAC management, there are NO ecu pin changes to be made!! I cannot stress this enough. The car above (my car!!) does not have any pin changes on the ECU, and its fine. Many sources I had found while searching to do this, said I would have to change pins. Looking at the wiring diagrams, I found this hard to believe. When I purchased my engine and ECU, it came with the FRST engine loom. So I sat with my multi-meter, and found out where all the ECU wires went!

Results are as follows!

1, Red -- +ve
3, Brown/Yellow – octane / idle adjust
4, Brown/White – speed sensor
7, Brown/Green – engine temperature sender
16, Brown – current return & 40
17, Brown/Green – diagnostics connector
20, Brown – current return
21, Brown/Yellow – idle speed valve
22, Brown – fuel pump relay
23, Brown/Red – octane / idle adjust
24, Brown/Blue – octane / idle adjust
25, Brown/Yellow – air temp sensor
26, Brown/Black – throttle sensor & co adjust pot & map sensor
27, Brown – CO adjust potentiometer
28, Blue/Yellow – Pin 2 on edis (disconnected)
33, Brown/Green – Boost control valve
36, Blue/Red – Pin 3 on edis
37, Black – idle speed valve & injectors & Speed sensor & Boost control (tbc) & 57
40, Brown – current return & 16
45, Brown/Yellow – map sensor
46, Brown – map sensor & engine temp & air temp & throttle & CO adjust
47, Brown/Green – throttle sensor
48, Blue/Green – diagnostic connector
56, Blue/Yellow – Pin 1 on edis
57, Black – idle speed valve & injectors & Speed sensor & Boost control (tbc) & 37
58, Brown – Injectors
59, Brown – Injectors
60, Brown – current return
from http://www.escortrsturbo.co.uk/forum...pic=10738&st=0

i'm doing ofac.
many thanks!

mentalasanything

Hi Mate,

As far as the ECU pinouts are concerned they are the same for 1AFA and OFAC. It's ancillary connections that need changing/extending if you are retro-fitting the loom to an S2.

You are correct to have altered/extended the cables you mentioned, these are all ancillaries. I guess you are converting an 88 spec car since you've changed the temp gauge sender? Have you also done the petrol gauge? I must admit I didnt know about the reverse switch but I'm sure you're right. You'll need to change the fan connector over too.

If you find an XR3i EFi wiring diagram let me know, I havent seen one either!

Cheers,

Lee

stafcio

i sorted most of the plugs, i used haynes manual diagrams and electric meter. there's no better way.
i have only one issue: is it possible that some plugs will remain unplugged? i have couple that can't be matched.

mentalasanything

Can you get some pics up and describe their location?

Lee

martinmilne

Is there any where you can buy the pedal and throttle cable is it right any xr2i or xr3i one can be used

mentalasanything

You'll get the cable at your local motor factors. As for the pedal though I'm unsure.

Lee

James-W

How about if I wanted to use an mfi system but on an efi head? How much trouble is this LOL

mentalasanything

None, as long as you use the correct adaptor plate.

Lee

andmir

May be somebody know what MAP sensor I need if I have OFAC ECU? I know that I need V90FB9F479AA, but may be there is any MAP with the same characteristics it means analog?

andmir

Hi, may be you know what MAP sensor I need if I have OFAC ECU? I know that I need V90FB9F479AA, but may be there is any MAP with the same characteristics it means analog? There are some MAP sensors for turbo Ford cars (the same style) in the USA.

mentalasanything

OFAC ECU's use digital MAP sensors. I know that the small turbo Escort Cosworth (EEC-IV) has a useable MAP sensor. I'm not so sure on the US Market but I'd have thought that maybe some EEC-IV powered turbo models will have similar MAP sensors.

Lee

andmir

Thanks for answer. I think that Motorcraft DY503 may be similar.(Mercury Capri 2.3Turbo)

Cameron

If i use a fiesta turbo loom will i need a fiesta turbo fuel injection and pump relays and do away with the escorts pink relay? How do i wire it up?

Cameron

If i use a fiesta turbo loom will i need a fiesta turbo fuel injection and pump relays and do away with the escorts pink relay? How do i wire it up?

mentalasanything

Yes you will need the FRST relays and you will do away with the ERST pink relay. Wiring diagram is on the first page of this thread (hand drawn diagram).

Lee

Cameron

Im afraid ill need that in idiots terms mate im not very clued up on wiring

mentalasanything

Without wishing to be rude, the diagram is as basic as it could be. Perhaps you could have someone wire it up for you?

Lee

Cameron

Ive started sorting the loom out, am i right in thinking that if you run a wire from pin 11 of the edis you dont need to run a wire from pin 3 of the engine loom plug?

mentalasanything

Yes, or you could connect Pin 11 of the edis plug to pin 3 of the car loom plug instead of what's currently there to keep it neat and tidy.

Lee

Cameron

Which colour wire is the rev counter input? I take it its on the blue multiplug on the instrument cluster wiring? Also does pin 85 of the fuel injection relay have to go to battery negative? Or can you earth it instead?

mentalasanything

IIRC the wire is green. Yes, pin 85 can go to earth, the body is negatively earthed.

Lee

Cameron

Cheers Lee, hopefully get it fired up soon