DIY: 4g15 to 4g93 engine conversion (WIP)

Res

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this is a work in progress, right now i can only do the start, but tomorrow im planning on taking the rest of the photos so the rest of the writeup should be kicking off tomorrow arvo/night.

so to start things off
DISCLAIMER: everything in this DIY is an attempt at your own risk, I am by no means a professional, so if anything goes wrong dont blame me, so if ur worried about something use common sense seek extra opinions and guidance maybe even talk to a professional.


Step 1: getting everything you need.

now you may be saying to yourself "but Res, its simple i just grab the engine, loom and ecu from a wreck"
and you would be correct and getting the whole of these parts will mean ur not missing anything just incase
but.
i will list exactly what you will need, just incase you are short on funds, and maybe buying that extra loom piece will cost over budget who knows, but here is exactly what you will need off the 1.8L lancer aswell as some extra expendables
please read it all as some of it you may or may not have known that you did or didnt need it.

*complete 4g93 engine
-block (complete)
-head (complete)
-exhaust manifold and downpipe to cat (1.8L downpipe will bolt up to the 1.5L cat)
-intake manifold with throttle body
-whole throttle cable for the 1.8L (1.5 cable does not fit)
-all engine mounts/ roll stoppers from the 1.8L
-maf sensor
-your choice of intake piping, keep in mind the 1.5L intake pipe will not fit the maf
-maf adaptor if not using the oem 1.8L intake (optional)
-4g93 gearbox (complete), or you can use the 4g15 if you wish
-4g93 clutch assy (disc, pressure plate) (note: may be a good time to replace such parts)
-1.8L flywheel please note u will need the 4g93 clutch and flywheel regardless of which box you use

*Loom (engine left and right side looms) you do not require the dash loom, however some parts from the dash loom are required, but these parts unplug easily and are easily recognisable, i will detail each part i am talking about within the diy so read on if you dont know what a part is, it will be explained. AT NO POINT DO U NEED TO CUT THE LOOM AT ALL! (cos cuttin' is sooo emo)
-ECU (same car*)
-cluster for the 1.8L (i cannot confirm you definitly need this but my 1.5L cluster did not work, and i couldnt tell if it was something i did wrong as it was at a point where it was a bit buggy or if it was not compatible with the 1.8L but the 1.8 cluster worked fine with little mucking about)
-Ignition barrel and key to suit (same car*)
-immoboliser unit/key reader unit (same car*)
-passenger side engine loom ;goes from inside the cabin where the ECU is thru the firewall and has all the plugs for the gearbox, coilpacks, injectors, CAS etc etc... this loom part also plugs into the drivers side far loom end with 1 plug
-drivers side engine loom, this is a very long loom, it starts in the cabin under the steerign wheel where the fuse box is, goes out thru the firewall into the drivers side fender/wheel well. then travels behind the drivers headlight, down under the radiator across the the passenger side of the vehicle up to the passenger headlight, and then goes into the passenger side fender
******you DO NOT need the loom that spans the dash, this is the same between gli and mr asside from the fuse box and the key reader module

for the sake of installing as an oem looking engine for paperwork you will also need
-1.8L intake S pipe and resonator (different to the 1.5L pipe the 1.8 has larger dia at box end)
-1.8L airbox very very different to the 1.5 box


----------TO BE COMPLETED---------------
 
What's the go with the 2 computers?
I think mmc77 mentioned something about it the other day.

My donor car is a triptonic auto, maybe that's what's it's in reference to, I'm not sure.
Hopefully I can use the loom :?
 
luv to know hows it goin and if u could post sum pics that would be great as im thinkin bout doin the same myself...cheers and good luck
 
1.8 conversion, something to get my hands working on.

OR a 1.5T or 1.8T depending on $ versus time and effort. Its why I am keen on this thread :)
 
eh neh, i listed the parts needed, take out the corresponding 4g15 parts and replace with 4g93 parts listed above and u have done a conversion
/incredibly lazy
 
-drivers side engine loom, this is a very long loom, it starts in the cabin under the steerign wheel where the fuse box is, goes out thru the firewall into the drivers side fender/wheel well. then travels behind the drivers headlight, down under the radiator across the the passenger side of the vehicle up to the passenger headlight, and then goes into the passenger side fender

when doing this swap I have never changed this loom as the 4G15 is the same as the 4G93 only difference is the fog light plugs but then you need the MR one anyway...

I think the only time I have swapped out that loom was when I did the 6A12 swap...
 
-drivers side engine loom, this is a very long loom, it starts in the cabin under the steerign wheel where the fuse box is, goes out thru the firewall into the drivers side fender/wheel well. then travels behind the drivers headlight, down under the radiator across the the passenger side of the vehicle up to the passenger headlight, and then goes into the passenger side fender

when doing this swap I have never changed this loom as the 4G15 is the same as the 4G93 only difference is the fog light plugs but then you need the MR one anyway...

I think the only time I have swapped out that loom was when I did the 6A12 swap...
Sorry for the thread dig but this seems to be the only DIY on this conversion, I wanted to confirm about the drivers side loom. I pulled a 1.8 today from the wreckers but I left the drivers side loom as it didn't attach to any part of the block/head so I figured it'd be the same in my mirage. Can you or anyone confirm this is the case? It's easy enough for me to go back and get the loom but I won't bother if I don't have too :)
 
Sorry for the thread dig but this seems to be the only DIY on this conversion, I wanted to confirm about the drivers side loom. I pulled a 1.8 today from the wreckers but I left the drivers side loom as it didn't attach to any part of the block/head so I figured it'd be the same in my mirage. Can you or anyone confirm this is the case? It's easy enough for me to go back and get the loom but I won't bother if I don't have too :)
The loom that is on the engine, that will go through the firewall and connect to plugs located above the ecu, should be about 4-6 plugs or so. Of course there is the main earthing wire and power wire as well that will unplug from the fuse box too.
 
I was still using my stock Mirage loom till it was changed for a cm5a one.
 
thanks all, I pulled the loom today and I decided to leave it there as its just all the front and accessory things. I guess if I plug in my new engine and *poo* doesn't work I'll go back and grab it, lol
 
I wouldnt worry about it too much.
I've had the CM5A engine loom with MR coupe interior and front loomm, then had the CM5A engine loom with a Evo 6 interior harness and a MR coupe front loom and now currently running, CM5A engine loom and front loom and Evo6 interior loom. It all works together. The aim was to get my climate control working. Once i get my hands on a unbutchered CM5A interior loom it should all work 100% and a little less Frankenstien.
 
I wouldnt worry about it too much.
I've had the CM5A engine loom with MR coupe interior and front loomm, then had the CM5A engine loom with a Evo 6 interior harness and a MR coupe front loom and now currently running, CM5A engine loom and front loom and Evo6 interior loom. It all works together. The aim was to get my climate control working. Once i get my hands on a unbutchered CM5A interior loom it should all work 100% and a little less Frankenstien.
Just an FYI the alternator between the 1.5 and 1.8 is different and has a different plug so you 100% need to swap both drivers (battery) and passenger (ecu) looms.

I didn't so now I've gotta go find a battery loom
 
Just an FYI the alternator between the 1.5 and 1.8 is different and has a different plug so you 100% need to swap both drivers (battery) and passenger (ecu) looms.

I didn't so now I've gotta go find a battery loom

I put a front MR harness in my Mirage before I went 1.8, the battery wiring was all the same. So I'm not sure why you need a "battery loom". It should all be part of the harness that is your front lights, indicators, side repeaters, battery, engine bay fuse box and other front end electrics. The only real difference was that the MR harness had fog light plugs. Everything else was the same, including battery wiring and terminals.

As for your alternator, I gather you're using your 1.5 on the 1.8.
Last time I saw a conversion, not mine. They just pulled the engine whole and unplugged the engine loom out of the wall leaving the alt, ps and AC and everything still plugged in. Sounds like it saved the drama of changing plugs like you've mentioned.
 
I put a front MR harness in my Mirage before I went 1.8, the battery wiring was all the same. So I'm not sure why you need a "battery loom". It should all be part of the harness that is your front lights, indicators, side repeaters, battery, engine bay fuse box and other front end electrics. The only real difference was that the MR harness had fog light plugs. Everything else was the same, including battery wiring and terminals.

As for your alternator, I gather you're using your 1.5 on the 1.8.
Last time I saw a conversion, not mine. They just pulled the engine whole and unplugged the engine loom out of the wall leaving the alt, ps and AC and everything still plugged in. Sounds like it saved the drama of changing plugs like you've mentioned.
Nah was using the 1.8 alt. Went and got a 1.5 alt and did it that way, got another plug mismatch now but I'll leave that for another thread.
 
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