3A92 engine parts history (changes over the years)

So, I was nerding it up today and digging through a Mitsu parts distributor's site. I decided to copy and paste their parts list into excel and see exactly what changed over the years. For those who want to know the inner workings of things so you can do future upgrades, or upgrades when components wear out, etc. its quite interesting.

2014
- Mid year (4/1/14) new engine mount strut. #4 on the diagram.
Attachment 10436
- Mid year (4/1/14) new front crank (front main) seal. #5 on the diagram.
Attachment 10437


2015
- No changes.


2017
- New transmission mount. It now has a separate part number for auto and maunal trans. #8 on the diagram.
Attachment 10436
- New roller camshafts. Intake camshaft is new for the auto and manual. The exhaust camshaft is new for the auto, but the exhaust camshaft is the same for the manual. #16 and 17 on the diagram.
http://mirageforum.com/imgs/2017update07.jpg

- An image from a 2017 automatic engine.
http://mirageforum.com/forum/attachm...3&d=1520885078

- New timing chain.

Quote:

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Originally Posted by 3dplane

there are a lot more efficiency changes in the engine like ... the timing chain inner link plates are made to "stick out" little bumps to reduce friction rubbing on the guides vs.the 'old' design where the entire edge of the chain assembly is rubbing on the guides.

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http://mirageforum.com/imgs/2017update09.jpg

- New front cover. #22 on the diagram.
- New control valve solenoid. #24 on the diagram.
- New piston. Assumed to have added an anti-friction coating on the skirts. #26 on the diagram.
- New piston ring. Added DLC (diamond like carbon) coating.
http://mirageforum.com/imgs/2017update08.jpg

- New crankshaft bearings. Assumed to have added an anti-friction coating. #29 on the diagram.
Attachment 10438
- Mid year (8/17) new mass air flow sensor. #12 on the diagram. Added o-ring as separate part number for sensor. #11 on the diagram.
- New resonator for automatic transmission. Now separate part numbers for auto/manual. #16 on the diagram.
- Added an air guide and clip (these parts were absent on previous years). #20 and 21 on the diagram.
Attachment 10443
http://mirageforum.com/imgs/2017update01.jpg

- New exhaust manifold with integrated catalytic converter (cat).
2014 -2015
Attachment 10445

2017 -
http://mirageforum.com/downloads/201...stmanifold.png

http://mirageforum.com/imgs/2017update02.jpg

- New oxygen sensors, upper and lower are new. Upper at least is now a linear air fuel sensor instead of traditional O2 sensor. Auto and manual have different part numbers too.

http://mirageforum.com/imgs/2017update03.jpg

http://mirageforum.com/imgs/2017update04.jpg

http://mirageforum.com/imgs/2017update05.jpg



Parts list:

Green highlighting indicates a change.

http://mirageforum.com/downloads/enginelist1.jpg
http://mirageforum.com/downloads/enginelist2.jpg
http://mirageforum.com/downloads/enginelist3.jpg
http://mirageforum.com/downloads/enginelist4.jpg
http://mirageforum.com/downloads/airintake1.jpg
http://mirageforum.com/downloads/exhaustmanifold.jpg

Reserved for future use.

If anyone has any insights into the changes, or additional information about the changes please let me know so I can add it.

https://www.mitsubishipartswarehouse.com

https://partsouq.com/en/catalog/genu...=%24WiVICgE%24

Yep, I've been using Mitsu parts warehouse. Very useful!

Quote:

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Originally Posted by Daox

2017...

- New roller camshafts. Intake camshaft is the same for auto/manual, but exhaust camshaft has separate part numbers for auto/manual.

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It'd be interesting to get profile specs on these. One may be better suited for efficiency than the other. In which case... cam swap!

I agree, it would be really interesting to see the differences and even get someone to measure both the 2014/2015 and 2017+ cam shafts.

Added the changes to the 2017 exhaust manifold.

I've updated the 2017 engine mount info. I corrected an error I made.

BIG update to the first post. 3dplane got us some amazing info on the 2017 engine updates which include:

- Intake air temperature reduction guide. Supposedly helps fuel economy.
- Exhaust manifold and catalytic converter updates.
- New linear air fuel sensor. I never knew we had a wideband O2 sensor!
- New roller camshaft. Intake only on manual trans. Intake and exhaust on CVT.
- New piston top ring contact surface. It is now coated with DLC - diamond like carbon to reduce friction. Claim is 20% friction reduction.
- Low friction timing chain. Claim is 20% friction reduction.


Here are the images he provided:

http://mirageforum.com/imgs/2017update01.jpg

http://mirageforum.com/imgs/2017update02.jpg

http://mirageforum.com/imgs/2017update03.jpg

http://mirageforum.com/imgs/2017update04.jpg

http://mirageforum.com/imgs/2017update05.jpg

http://mirageforum.com/imgs/2017update06.jpg

http://mirageforum.com/imgs/2017update07.jpg

http://mirageforum.com/imgs/2017update08.jpg

http://mirageforum.com/imgs/2017update09.jpg



Of course, I have some questions!

On the converter image, it references MCC, FCC and UCC. What the heck are these acronyms? :)

I never knew we had a wideband o2 sensor. That is super nifty. I assume the new part numbers ar simply for longer wire leads? But, why does the manual and CVT have different part numbers?!?

I am curious as to why they added the colder air intake 'for fuel economy' when it seems warmer air gives better fuel economy...

Cool new tidbits.

Wonder why the manual transmission doesn't get TWO roller camshafts like the CVT?

Cost tactic to keep the base car price down?

CAFE measure to increase the CVT's rating further, which is already artificially higher than the manual's due to the testing process?

A little digging and asking questions answered my catalytic converter acronym question:

mcc - manifold catalytic converter
fcc - flange catalytic converter
ucc - under-floor catalytic converter

Where'd you find your definitions?

Google and asked on EcoModder.

I added Fummin's picture of the camshafts off of a 2017 CVT Mirage.

http://mirageforum.com/forum/attachm...3&d=1520885078

Hi again folks long time since i have been around here. any way just getting thoughts on buying a second hand Mirage and have been looking around on this site loading up on new info. now these engine updates for the 2017 year has me interested. One thing i have not seen yet is did all these changes with roller cam/cams, timing chain and top piston ring etc actually bring a reduction in fuel consumption or just got the extra 4 HP? Any help on this would be most welcome.

Jamiec - Mirageforum's oldest member - welcome back! :D

Even I picked up a used Mirage last November (2014 model).

Unfortunately, the EPA revised its testing procedure starting with the 2017 model year, resulting in a *decline* in the Mirage's fuel economy rating in the U.S. (and Canada, since we always follow suit).

Thread: 2017 Mirage MPG/fuel economy rating on EPA site (lower than last year/ revised test)

That's not to say its actual fuel economy declined vs. the previous model. Confusing, yes.

If I had to guess, I'd say it'd be slightly more efficient in the real world. But likely by such a small amount, it'd be hard to detect, head-to-head.

Darin

Quote:

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Originally Posted by jamiec

Hi again folks long time since i have been around here. any way just getting thoughts on buying a second hand Mirage and have been looking around on this site loading up on new info. now these engine updates for the 2017 year has me interested. One thing i have not seen yet is did all these changes with roller cam/cams, timing chain and top piston ring etc actually bring a reduction in fuel consumption or just got the extra 4 HP? Any help on this would be most welcome.

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That's a good question, and I wondered the same thing myself.

It's hard to compare the early 2013/14 Mirages with the 2019 or 2020 Mirages in Canada because the fuel economy ratings standards got more restrictive. So basically it's not an apples to apples comparison anymore and I am not sure how to factor in the change. My hunch is that the economy is terrific and within 5% up or down... that most are happy with the economy they get.

I haven't been to the dealer since 2019 but I think they said over 43 mpg posted on the demo in the showroom, so that's down from the 64 mpg they advertised when I bought my car originally in april 2014 eh. I think it's the new standards though accounting for the lower fuel economy.

Thanks for the welcome back mate and now i feel old well i am older then last time i posted lol. Yes i did see you got one and i thought i would have had one before you. And i see you are testing out the sales market already.

does not help when they keep changing the rating system. So guess then no one has reported any real verified economy improvements. Though i did read someone here that over revved an engine replaced a pre 2017 engine with a post 2017 and seemed to have had better economy.

I am just trying to work out weather i should get a later car with engine updates or it does not really matter. now i wonder if any improvements with aerodynamics have been made as i did see something about the rear spoiler being revised as well.

glad to know some of you folks are still here :)

I'd get a 2017 or newer if I had the choice. They have a little more power, and had some improvements to the suspension, brakes and corrected some wiring problems for 2017. At least in the Canadian market. I can't speak for the rest of the world? The only thing that I can think of that isn't better would be the exhaust that will wear out the rubber hangers and cause noise. They use a catalytic convertor that is integral to the exhaust manifold from 2017 and newer.

I don't know why, but I didn't know the engine had a timing chain.

Quote:

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Originally Posted by Subcompact Culture

I don't know why, but I didn't know the engine had a timing chain.

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And you want to sell yours. Shame. :(


:)

Thanks Fummins i will keep those improvements in mind. i think they have added bigger brakes since the first cars came out to.

I never realized how many little tweaks they did to the US 2017 and newer models as compared to the US 2014/2015 models. I always assumed it was mostly cosmetics. I think it's awesome that the changes performed were literally from the inside out in order to improve the car overall as if it wasn't good already. The big effort put into reducing friction, reducing emissions, increasing fuel economy, and increasing hp performance, and improving driving dynamics like braking and handling is just amazing for a car with this much value and low cost.

I recently acquired a 2015 DE with a manual trans (which I am happy and satisfied with) but I had no idea the 2017 and newer models had some cool (new to me) tricks up their sleeves. This makes me really excited about the 2021 and newer models coming in the near future. My next Mirage would likely be the fully loaded 2017 SE with a manual trans unless the 2021+ models come with more of these great incremental tweaks and improvements that aren't always obvious or apparent even to a Mirage enthusiast like myself.

Has anyone heard of any news in regards to new changes coming down the pipeline for the near future models? Any further improvements to the 3A92?

Well I think Doax solved the mysterious question of pre 04/01/14 CVT not being able to switch out with the new models. The transmission mount is different. Fummins what do you think?

Fake news lol

Quote:

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Originally Posted by Fummins

Fake news lol

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No? They look the same to you?

The transmission mounts are the same up to 17' by the looks of it. The dogbone mount looks the same to me. If I get bored I'll pick up a low mileage engine for mine and if someone wants to donate $700 or so for science I'll pick up a 2015 cvt and bolt it in to see if it works too. I could just compare wiring schematics and try to find tcm part numbers too but that involves reading.
If mine blew up tomorrow I'd buy one from a 2014-2018 and give it a try. If it doesn't work out, gut the drivetrain, exhaust and fuel tank and make it electric. Would probably need a manual transmission of some kind too.