fiestaturbo.com

[XR2i dude]

hey guys.. not quite the same as the above ecu thread......

im buying an rs1800 ecu for the final piece of the jigsaw of my 130ps conversion and i was wondering if its just a simple plug n play operation as some guy on ebay is also giving his chip key and transponder with his ecu.... now this made me think is the ecu going to be ok for my xr2i wiring loom and ignition?!?!?

maybe a n00b question.. but all the same if anyone can give me peace of mind id be grateful.....

many thanx dave.

[Ollybee]

We need to know age of your, the engine loom you are using and which ecu you had before and which ecu you are looking at. They come with a four digit ID code.

[XR2i dude]

oh my.. lol.. cant beleive im not giving that info in my first post... lolol

its a j reg 1991 fez... using a 2fcd ecu atm

ive brought a 2fdc ecu

[Ollybee]

I'm fairly sure that is the ecu you require and you won't need to bother with his key.

[XR2i dude]

muchos grassy arse olly.. thanx for ur speedy response... unless anyone else has any comments il take it that his word n my initial thoughts r correct...

but pls post comments to confirm this too pls.. itll make me feel better..lol

[Smo]

Yeah, that ECU is correct. You don't need the key or anything though as there is no PATS system on either Fiesta.

Even MK3(3.5) Fiestas that did have PATS don't require the key or anything to use the ECU as the PATS module is external to the ECU.

[Smo]

I noticed in another thread you say you were using a 2.0 MAF when trying to use the 2.0 ECU - this isn't right for the RS1800 ECU, just so you know - you need to use your XR2i 16v one. Apologies if you know this already of course!

[XR2i dude]

oh... its running fine on my xr ecu atm.......why dont i need a bigger MAF if im dealing with more air and fuel????

[Smo]

Because the sensor is different, not just the housing, and therefore you will probably find it's not running at its best. The fuelling won't be correct, which can be bad in the long run...

Your XR2i 16v MAF sensor is the correct one for the RS1800 ECU

[Ollybee]

Because the MAF's need to be calibrated to the tables in the ECU. If you plug in one that isn't calibrated to it, it runs like s**t.

[XR2i dude]

ok.. perhaps then u can clarify for me, why is it then that we upgrade the throttle body (for sheer size) but leave the smaller air sensor on..... im not arguing.. just wondering.... iknow the maf sensor is calibrated differently... but surely all its doin is adjusting the fuel to alloow more fuel to be burnt so that the mixture is right?????

[Ollybee]

But the ecu is pre calibrated. Each MAF type is different and will give different outputs therefore if the wrong one is used it tells the ecu the wrong information which in turn means the ecu buggers up the fueling.

[XR2i dude]

right.. so atm im using a 2.0 maf an xr2i ecu.. and 2.0 throttle body.... what would be your diagnosis of that?? lol

[Ollybee]

As Smo has told you the MAF is the wrong one. It should be the 1800 version. The throttle body isn't as critical as the TPS is interchangeable, but Ideally you should have the RS throttle body as well.

[XR2i dude]

ooo er i thought the rs throttle body was the same as the mondeo 2.0 one???

[Ollybee]

They are similar and I think they are the same diameter but they are not the same. You probably found this out by having to mount the TPS upside down and the accelerator bracket not fitting without modification.

[XR2i dude]

nah the tps (im not sure what this is.. but its the sensor to the left of the body???) went straight on matey.. and i used the springset from the 1.8 body i took off for the throttle cable... sorry for being a complete n00b.. but how do u know if you dont learn huh.. thanx for ur patience... why should this tps thing go on upside down.. my mate did the same but i dnt know why.... he never explained.. he just said so that it fittted on.... but mine fits on anyway...?>

[rs1800dom]

hi there, was reading the above information and was wondering if the same applied to my conversion. Have got a 1.8 16v xr2i and bought a deep ecu. i know i need to convert the loom, but i have the 2ltr maf sensor and tb from a 2ltr mondeo but not the same as the ecu came from. does this make a difference? or should i stick with my standard maf sensor? what difference would it make if i used only the cams, tb and maf sensor and no ecu upgrade? any help welcomed. thanks