how to install 93+ 5sfes in 91 mr2s.

[TomsMR2]

heres the deal guys. its REALLY easy, dont overcomplicate it.. keep it simple, follow this guide, and you'll be fine.

step1. find a donor motor from your year or newer. if its a 91/92 you can use whatever 5sfe you can find. if its a 93+ you MUST use a 93+ 5sfe with a knock sensor.

it doesnt matter where it comes from.

step2. remove your old 5sfe and remove the manifolds, wiring harness and EVERYTHING. throw away the longblock (block and head).

step3. remove all the components from the new motor and reinstall all your old components on the new motor. this includes sensors, water jackets, distributers, manifolds, wiring harness, valve cover, injectors and all. use ONLY the new longblock. use nothing from the new long block.

step4. install the new motor, plug it in and drive away.

do not change ignition parts. do not change manifolds and valve covers. do not use different colored injectors. do not change the harness. do NOT change the ecu, tps, or distributer!!!

its a very very easy swap, dont make it hard if you try to start hybriding stuff and making a frankenmotor, you might just find the car never runs again, or runs extremely poorly, or throws codes, or smokes, or doesnt start, or just melts down.

plus doing it this way is cheaper, you dont have to pay for new components that you dont need!

[AnthraciteAngel]

Great guide!

Though I have no intention of doing this - what's the advantage of having the later model 5sfe's?

[Redstar]

From what i've read the 93+ 5SFE advantages are:

Knock sensor, real TPS - not just a WOT switch, and gets rid of the batch fire fuel injection.

[TomsMR2]

^ arg, no!

if you put a late model 5sfe in a 91, you have no knock sensor, no 2+2 injection, no tps.. you have all 91 running gear! you're reusing all your stuff.

the advantage is that instead of having to try to hunt down your exact model year 5sfe, you can just go grab any 5sfe from anything and toss it in. keeps your options open, thats it. theres no power advantage or anything.

[Redstar]

Arg no?

Your not changing the ecu, wiring or any sensors, with this write up why would you expect anything to be different?

He was asking why the later model 5SFE's are better. Other than what I listed there are no real differences right? BTW how do you re-use a water jacket, I'm confused on that part.

[mrturrari]

To be fair the later model 5sfe's accompanied by all the electronics, harness, ECU and everything have the advantage of 5 extra hp, variable TPS and a knock system. Those things can be useful when you are trying to install a piggyback or EMS or if you are pushing the stock engine management with big cams or a big turbo and need the knock system to save you.

Tom's method is the easy way. The hard way, which is a complete engine swap in every sense, should only be attempted by those who know how to re-pin a harness and have a good reason to need the extra features of the rev2 electronics. It's a lot more work and usually not worth the trouble.

I think Tom meant the water goose neck where the sensors attach.

[TomsMR2]

Originally Posted by mrturrari

Tom's method is the easy way. The hard way, which is a complete engine swap in every sense, should only be attempted by those who know how to re-pin a harness and have a good reason to need the extra features of the rev2 electronics. It's a lot more work and usually not worth the trouble.

yup.. the later stuff IS better, but its 100% unnecessary to use to get a late model motor in your car. it can turn a weekend swap into a car sitting dead for months because you've got gremlins.

as it sits. a 93+ motor in a 91 car has no advantages. it'll run just like the 91 motor ran. on/off tps, full batch fire, small injectors and the works!

if you want to tackle the 93+ electronics conversion, thats a totally different post

I think Tom meant the water goose neck where the sensors attach.

yeah that one. some dont have enough holes for sensors, some do. best way is to just reuse your old one and then you know you've got the correct piece

its worth checking to see if they're identical.. but dont be surprised when you have to swap it over.

He was asking why the later model 5SFE's are better. Other than what I listed there are no real differences right? BTW how do you re-use a water jacket, I'm confused on that part.

theres really no reason to use one.. usually people stumble across a motor that someone pulled out of a 93+ mr2, or a celica, or even a camry for a good price and want to put it in. if you found a 91 motor in good shape theres nothing wrong with that either! no advantage or disadvantage, just knowing what it takes to install different year 5sfes into different year mr2s opens up a lot more options for replacement motors, just in case.

thats how i ended up with a 95 motor in my 91, and a 93 motor in my other 91.. its just what i happened to find first

[Redstar]

Good point, sorry for sounding like a dick...

I've heard rumors of the 98+ 5S being the primo model, better oil pump and internals. Anyone know if this is true?

[TomsMR2]

it has a higher flow oil pump.. im almost positive the internals are the same as the 93+.

camry 5sfes also have larger oil pans and balance shafts.. you can easily remove the balance shaft assembly and plug the oil feed holes though and get the 5ish hp back.

its also a viable option.. the higher volume oil pump builds pressure really fast, i have one on my 93 motor.

[conor]

*sniffle* I miss that block