MFI to aftermarket management
27-11-2018, 08:04 PM
#1
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Thread Starter
MFI to aftermarket management
Hi,
currently well into full rebuild of the RS turbo and well its fully stripped out I’m thinking of converting to EFI
whats the easiest way/aftermarket system to buy to convert. I was hoping would be just a matter of swapping head/inlet to a fiesta RST head and inlet then buying an aftermarket job that just plugs in etc. Guessing won’t be that simple? Don’t really want to swap loom pedal etc.
cheers
cheers
currently well into full rebuild of the RS turbo and well its fully stripped out I’m thinking of converting to EFI
whats the easiest way/aftermarket system to buy to convert. I was hoping would be just a matter of swapping head/inlet to a fiesta RST head and inlet then buying an aftermarket job that just plugs in etc. Guessing won’t be that simple? Don’t really want to swap loom pedal etc.
cheers
cheers
28-11-2018, 03:48 PM
#2
Standalone management will come with its own wiring harness. You will need EFI pedal (which consists of undoing 2 bolts), throttle cable, injectors, coil pack, ignition leads, sensors, and depending on where you get your trigger sensor from you will either need to drill your block to accommodate the efi cps bracket with an efi flywheel; this method is getting a lot harder to do as the fiesta cps bracket is near impossible to find. You could alternatively use a trigger wheel and keep your mfi flywheel. You could use the efi inlet but you would either need a conversion plate from efi to mfi to retain the mfi head or just swap the head for an efi one. As for old mfi loom if you want to keep it you could just leave all the connections as they are but if you are doing it properly then the correct way to do it is to cut all the mfi loom wires out and merge the new standalone management loom by the end of it having a nice neat loom. Easier said than done, but a its definitely worth doing it. Granted there's nothing wrong with MFI when maintained correctly but for the amount of hassle you can get when it comes to problems with mfi I would seriously recommend the conversion. Its not a simple conversion but once you get your head around the whole process it is very straightforward.
28-11-2018, 08:20 PM
#3
Part of the Furniture
Thread Starter
Standalone management will come with its own wiring harness. You will need EFI pedal (which consists of undoing 2 bolts), throttle cable, injectors, coil pack, ignition leads, sensors, and depending on where you get your trigger sensor from you will either need to drill your block to accommodate the efi cps bracket with an efi flywheel; this method is getting a lot harder to do as the fiesta cps bracket is near impossible to find. You could alternatively use a trigger wheel and keep your mfi flywheel. You could use the efi inlet but you would either need a conversion plate from efi to mfi to retain the mfi head or just swap the head for an efi one. As for old mfi loom if you want to keep it you could just leave all the connections as they are but if you are doing it properly then the correct way to do it is to cut all the mfi loom wires out and merge the new standalone management loom by the end of it having a nice neat loom. Easier said than done, but a its definitely worth doing it. Granted there's nothing wrong with MFI when maintained correctly but for the amount of hassle you can get when it comes to problems with mfi I would seriously recommend the conversion. Its not a simple conversion but once you get your head around the whole process it is very straightforward.
i was was going to get a complete fiesta RST inlet and head instead of using conversion plate, burton power Weber triger wheel kit, fiesta RST coil pack and leads. I guess my main concern is the wiring, I was hoping there was an aftermarket plug n play system that doesn’t require chopping n changing the old RST loom. if not I was thinking of swapping loom to an xr3i efi loom then a fiesta RST engine loom as I heard it’s a plug and play job with ofac ecu.
The MFI was running perfect tbh but I’ve got a forged bottom end, h rods etc and a stage3 turbo and feel it’s the head and mfi that’s going to stop me seeing 200plus bhp and be reliable.
Which do you think is the easiest option?
28-11-2018, 10:28 PM
#4
If its running perfect then why do you need to touch it? If it ain't broke don't fix it right?? 
A well tuned MFI system is fine if maintained properly. Many people are putting their cars back to MFI to keep it original, asking and fetching crazy money in this day and age. To an extent there is some truth in plug and play with the OFAB/C ecus, however, if you are going to be spending money on this sort of thing it would be better to start off with a new wiring loom as electrical issues haunt rs turbos, finding an xr3i/frst loom that's in good nick will also be a challenge. They do tend to pop up now and again such as the link I just found on eBay. You can buy off the shelf ready made wiring looms but they don't necessarily fit perfectly in the bay as they are just a generic size in length. Think about what standalone management you want to go for. OFAB/C is old hat and with the technology that is out there nowadays you can get something a lot better due to being more precise with fueling and other ecu features that OFAB/C just can't do. Another decision you will need to make is who will be mapping the car. Alternatively, you could have a chip in OFAB/OFAC ecu and just run beige injectors at around 200 BHP but there are a lot better injectors that flow better and potentially give you more horsepower should you want it. You have the right turbo and bottom end for good power. OFAB/C isn't all that once you realise the power of standalone management and how it can transform an engine.
The easiest option for me might not be the easiest option for you. I wanted to learn how the whole conversion works, the easiest thing for me would have been to just send it to someone who knows what they are doing to do it for me. There are several tuners who can do the conversion for you to save you all the agro of having to find parts etc but brings one back to the whole time vs money debate.
Ultimately its your decision, good luck with whichever you decide to go for.
A well tuned MFI system is fine if maintained properly. Many people are putting their cars back to MFI to keep it original, asking and fetching crazy money in this day and age. To an extent there is some truth in plug and play with the OFAB/C ecus, however, if you are going to be spending money on this sort of thing it would be better to start off with a new wiring loom as electrical issues haunt rs turbos, finding an xr3i/frst loom that's in good nick will also be a challenge. They do tend to pop up now and again such as the link I just found on eBay. You can buy off the shelf ready made wiring looms but they don't necessarily fit perfectly in the bay as they are just a generic size in length. Think about what standalone management you want to go for. OFAB/C is old hat and with the technology that is out there nowadays you can get something a lot better due to being more precise with fueling and other ecu features that OFAB/C just can't do. Another decision you will need to make is who will be mapping the car. Alternatively, you could have a chip in OFAB/OFAC ecu and just run beige injectors at around 200 BHP but there are a lot better injectors that flow better and potentially give you more horsepower should you want it. You have the right turbo and bottom end for good power. OFAB/C isn't all that once you realise the power of standalone management and how it can transform an engine.
The easiest option for me might not be the easiest option for you. I wanted to learn how the whole conversion works, the easiest thing for me would have been to just send it to someone who knows what they are doing to do it for me. There are several tuners who can do the conversion for you to save you all the agro of having to find parts etc but brings one back to the whole time vs money debate.
Ultimately its your decision, good luck with whichever you decide to go for.
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Bransby (29-11-2018)
29-11-2018, 06:15 AM
#5
Part of the Furniture
Thread Starter
Hi,
I guess the reason I was wanted to change to EFI is the need for more power, the reason I was looking into doing it now been the car is stripped minus dash/engine. I've nearly finished the welding works and thought it would be the best time to mess with the conversion before she goes in for paint early 2019. I've defiantly been convinced not to bother with old ford wiring now so I guess ill get her back together as I wont be changing the loom to the XR3i job. as I say I really do want an aftermarket EFI conversion as I want to run some big power if poss, I'm not fussed about keeping the car standard (engine wise) as it owes me nothing with what I paid years ago and I've had that back in smiles (when she works that is). I've searched hi and low on the internet and just cant find a tuner offering the conversion etc, I believe Jamesport used to do a gotech conversion but that seems to of been stopped also. also the only tuner slightly close to me in Leeds seems to be MSD so ill speak to them but I guess they will be quite busy.
thanks for the info btw been a lot of help.
I guess the reason I was wanted to change to EFI is the need for more power, the reason I was looking into doing it now been the car is stripped minus dash/engine. I've nearly finished the welding works and thought it would be the best time to mess with the conversion before she goes in for paint early 2019. I've defiantly been convinced not to bother with old ford wiring now so I guess ill get her back together as I wont be changing the loom to the XR3i job. as I say I really do want an aftermarket EFI conversion as I want to run some big power if poss, I'm not fussed about keeping the car standard (engine wise) as it owes me nothing with what I paid years ago and I've had that back in smiles (when she works that is). I've searched hi and low on the internet and just cant find a tuner offering the conversion etc, I believe Jamesport used to do a gotech conversion but that seems to of been stopped also. also the only tuner slightly close to me in Leeds seems to be MSD so ill speak to them but I guess they will be quite busy.
thanks for the info btw been a lot of help.
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