Technical Fitting a 1.3 MJD 90hp into mk2 uno 1.7D

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Technical Fitting a 1.3 MJD 90hp into mk2 uno 1.7D

claymas

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Hi guys,

I want to install a 1.3mjd with the VGT from the 90hp punto evo into my uno in the near future.

I wanted to know.

1)will the uno gearbox match up with the new engine and if so will the ratios be fine??

2)can I use the same drive shafts even if I have to switch to the 1.3mjd gearbox? and if not, will the newer mjd drive shafts be too long.

3)what else would I require other than the above components and all the electronics like ecu etc etc.?? Custom engine mounts ??

4) how do you think the car will respond/behave with this engine?
 
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Here are some pics of my UNO. She's 16 years old and has the original factory paint.
 

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You will need the gearbox from the punto if it is the 5 speed C510 type. This looks very similar to your gearbox on the outside as it is based on it. Your gearbox won't mate to the engine because of the bellhousing. The easiest thing is to remove the bellhousing from the punto gearbox and put onto yours. This is because the punto gearbox won't accept your shafts.

You then only need a FIRE engine mount for the wing. This is because the 1.3 mjtd is based on the FIRE engine.

If you have a cable clutch you will have to convert to hydraulic to use the clutch release mechanism. There is no speed sensor output, so you will need to figure out you own way of knowing your speed or have no speedometer.

That's all the easy bit.

To make the engine work using the ecus you will need to subscribe to fiat's keylearn programme to get a sub key with the manuals for the punto. You can then study the electrical diagrams and gain an understanding of modern networked auto ecosystems. From this you may be able to work out how you will separate the components you need to run the engine from the punto. I can't be more specific than that as it takes to along time to research and accurately answer those questions.

Tips: you will definitely need the body and engine ecus, all the wiring and sensors from the engine and interconnecting wires to the body ecu, coded key, accelerator pedal, you might want the dashboard so you can see stuff that is going on.
 
You will need the gearbox from the punto if it is the 5 speed C510 type. This looks very similar to your gearbox on the outside as it is based on it. Your gearbox won't mate to the engine because of the bellhousing. The easiest thing is to remove the bellhousing from the punto gearbox and put onto yours. This is because the punto gearbox won't accept your shafts.

You then only need a FIRE engine mount for the wing. This is because the 1.3 mjtd is based on the FIRE engine.

If you have a cable clutch you will have to convert to hydraulic to use the clutch release mechanism. There is no speed sensor output, so you will need to figure out you own way of knowing your speed or have no speedometer.

That's all the easy bit.

To make the engine work using the ecus you will need to subscribe to fiat's keylearn programme to get a sub key with the manuals for the punto. You can then study the electrical diagrams and gain an understanding of modern networked auto ecosystems. From this you may be able to work out how you will separate the components you need to run the engine from the punto. I can't be more specific than that as it takes to along time to research and accurately answer those questions.

Tips: you will definitely need the body and engine ecus, all the wiring and sensors from the engine and interconnecting wires to the body ecu, coded key, accelerator pedal, you might want the dashboard so you can see stuff that is going on.

Hi lewey,
Thanks for your reply.

My car has a hydraulic clutch.So I guess that fine.The engine mouths for the 999cc fire will fit directly onto the 1.3mjd without any mods?

Why do I need to subscribe to the keylearn program.I'll be getting the entire ecu + wiring from a scrap car though I'll be buying a brand new engine.Engine swaps are illegal here unless the replacement is brand new,from the same manufacturer and the old one isn't available.

What if I use the punto shafts on the punto gearbox?
If that won't work then would my current gear ratios be fine.

I'll be adding a few extra gauges(tachometer,boost gauge etc)
 
My car has a hydraulic clutch.So I guess that fine.The engine mouths for the 999cc fire will fit directly onto the 1.3mjd without any mods?

Will go straight on without mods.

Why do I need to subscribe to the keylearn program.I'll be getting the entire ecu + wiring from a scrap car though I'll be buying a brand new engine.Engine swaps are illegal here unless the replacement is brand new,from the same manufacturer and the old one isn't available.

I suppose you are right that if you transfer everything that provides an input to the engine that it will work. I think you may underestimate how much stuff this is. How will you know without wiring diagrams? I gave you some tips, not an exhaustive list of things you will need. Even not having switches on your brake and clutch peddle will make the car unpredictably un-drivable. The engine may refuse to start for any number of reasons. You may need to find out why, which can be more difficult than you think too. I would want a way of interrogating the ECUs like "MultiECUScan".

What if I use the punto shafts on the punto gearbox?
If that won't work then would my current gear ratios be fine.

You will have to customize the drive shafts to be short enough and to use CV joints that can fit your car. Quite a lot of work, even for an expert.

Your current ratios won't be shorter than the Punto Evo gearbox because the Punto has such larger wheels that contribute to it's longer gearing.


I'll be adding a few extra gauges(tachometer,boost gauge etc)
Boost gauge is easy enough as presumably you are aware. You may find the tachometer harder than you think as this information is only available on the cars network between the ECUs.



Your questions are hard to answer as I don't know how good you are at mechanics or auto-electrical things. You have concentrated on the mechanical things, so perhaps that is your thing, but you don't know the complexity of modern electronics? To progress in this exchange you will need to tell me you do understand all this and you just wanted to know whether engines would fit in. Otherwise this is just a waste of time.


In terms of how the car would drive with one of these engines; it would be lighter than your current car with this engine set up, so would handle better and it would be faster than any Uno ever made, including the Uno Turbo. You will have terrible torque-steer because the drive shafts are unequal length unless you are able to customize the Punto Evo setup.
 
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My car has a hydraulic clutch.So I guess that fine.The engine mouths for the 999cc fire will fit directly onto the 1.3mjd without any mods?

Will go straight on without mods.

Why do I need to subscribe to the keylearn program.I'll be getting the entire ecu + wiring from a scrap car though I'll be buying a brand new engine.Engine swaps are illegal here unless the replacement is brand new,from the same manufacturer and the old one isn't available.

I suppose you are right that if you transfer everything that provides an input to the engine that it will work. I think you may underestimate how much stuff this is. How will you know without wiring diagrams? I gave you some tips, not an exhaustive list of things you will need. Even not having switches on your brake and clutch peddle will make the car unpredictably un-drivable. The engine may refuse to start for any number of reasons. You may need to find out why, which can be more difficult than you think too. I would want a way of interrogating the ECUs like "MultiECUScan".

What if I use the punto shafts on the punto gearbox?
If that won't work then would my current gear ratios be fine.

You will have to customize the drive shafts to be short enough and to use CV joints that can fit your car. Quite a lot of work, even for an expert.

Your current ratios won't be shorter than the Punto Evo gearbox because the Punto has such larger wheels that contribute to it's longer gearing.


I'll be adding a few extra gauges(tachometer,boost gauge etc)
Boost gauge is easy enough as presumably you are aware. You may find the tachometer harder than you think as this information is only available on the cars network between the ECUs.



Your questions are hard to answer as I don't know how good you are at mechanics or auto-electrical things. You have concentrated on the mechanical things, so perhaps that is your thing, but you don't know the complexity of modern electronics? To progress in this exchange you will need to tell me you do understand all this and you just wanted to know whether engines would fit in. Otherwise this is just a waste of time.


In terms of how the car would drive with one of these engines; it would be lighter than your current car with this engine set up, so would handle better and it would be faster than any Uno ever made, including the Uno Turbo. You will have terrible torque-steer because the drive shafts are unequal length unless you are able to customize the Punto Evo setup.

Thanks lewey for all the info,this did help.

I'll work out the electronics as I'm an electronics engineer and will be doing a master's in embedded systems before I undertake this project.

I understand this is a really complex project but since I don't have a deadline for it and will start once everything is planned out and settled I don't have a problem with how long it will take.

Do you think it'll really be faster than the uno turbo? 118 hp vs 90 on the mjd and given the fact that mine's a 5 door I guess it would be heavier than the uno turbo thought lighter than it's current state.

Once again thanks for all the info ,I'll post here when I actually get started on the project.
 
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Oh and about the torque steer,would I be able to reduce it by somehow calibrating the power steering to compensate for it.
 
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OK, I think I understand the project more now. It will take a while, yes.

The finished car would weigh the same as an Uno Turbo I reckon. 5 door Unos are only 10kg heavier than 3 door cars and the engine setup will be lighter - smaller, plastic inlet manifold, small turbo, lighter engine block will add up.

You may want to change the front coil springs as they will be a bit tall and hard I would have thought.

The torque of the diesel will compensate for the lack of horsepower compared with an Uno Turbo I think, but only if you have the right (tall) gearing.

Never seen a power-steered Uno. What year of car do you have?

There are other gearbox options, but you will need to do some homework. You can use the Punto gearbox with Uno Turbo drive shafts. You will need the stub axles that go into the gearbox from the Uno Turbo too as well as the intermediate shaft that goes access the back of the engine. The issue you will have is using the intermediate shaft on the MJTD engine. You can use the stanard bearing bracket from the MJTD, the Uno Turbo shaft with it's bearing will fit it, but whether it will be too long or short to fit the splined end into the gearbox properly will be down to luck.

I used this technique to fit a T-Jet Punto engine and it's gearbox into my Uno. Here is a post that shows Uno Turbo shafts in a C510 gearbox:
https://www.fiatforum.com/uno/245531-1368cc-16v-fire-turbo-t-jet-uno-conversion.html?p=2568954

You may have to get Uno Turbo or turbo diesel hubs to fit the CV joints as they are 25 splines instead o the standard 22.

In fact, if you find it easier to get turbo diesel parts where you are, just use them as they are mostly the same as Uno Turbo.
 
Thanks lewey,your thread seems very helpful and your car is awesome too.Would love to see some videos.

The front struts and coils on my car are brand new magneti marelli ones.

Mine is a 1999 1.7d elx model.
It was sold in India from 97/98-2003.

The Uno turbo was never sold here and neither was the 1.7 TD.But the same 1.7TD was sold in the Siena.Would those parts work?
 
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No. They made a 1.3 turbo diesel Uno with the same setup too. There are a couple of videos early in the car's development in that thread.

I know lewey but the only diesel uno sold here was the 1.7D.The petrol versions were the 999cc fire and 1.2 mpfi.
 
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