I purchased an 87 t2 roller for $100 body is excellent but it has no drive train at all. I've got a t2 and N/A diff for it just haven't decided which i'm going to use yet. The opportunity has come up to purchase a good running 87 N/A engine for a decent price and i think im going to jump on it.
Would i need a N/A harness or can i use the t2 that i have?
If it put the t2 flywheel and clutch can i run a t2 trans, dshaft, and diff?
Anything else i should know before starting?

I know its not what most people would do but right now it seems to be the best option to get me driving a rx7 for less than $1000. Don't flame me please.

 

If you use the TII flywheel that matches the series of engine( in this case S4) then you can use the TII clutch, trans, dshaft, and diff. Which is the route I'd recommend in case you ever deciede to go back to a turbo engine. As far as the harness I'll let someone else chime in as I'm only familiar with S5 electrical stuff. A comparision of the ecu pins in the FSM should get you started on the harness differences.

 

I think you'll need the NA harness AND ECU.

 

This is what my thought process was, because i do want a T2 eventually. So i found out the engine does come with a wiring harness so that will save me from finding one. Thanks for the input i think i'll pick it up. priced at $300 idk if thats good for a running s4 or not.

 

i don't think you could go wrong at $300, unless its missing half the parts from the car and has a bad coolant seal.

 

Has good compression and seen it run. It is complete top to bottom and is bone stock, might even have A/C.

 

*Update* picked up the engine today and boy did I (hopefully) get a deal. Sold me a good N/A engine, t2 throttle body, t2 upper intake, t2 lower intake, turbo manifold, turbo, top mount intercooler and a harness for $300. I have no plans to turbo this motor but I'll be adding these parts to the collection.

 

If you got an S4 NA engine, you could turbo it. You have all the bits to do it. I know Aaron Cake has done it successfully.

I'll link this, call it food for thought.

2nd Gen RX-7 Modifications

 

I've seen the aaroncake build and it looks awesome but i don't consider myself a fabricator in the least! So maybe i'll try to sell the turbo parts to offset the cost of this build.

Does anyone know if i'll have injector resistance to worry about? car is an 87 engine is unknown year s4

 

the engine harness would have a plug for a resistor pack if it is a 86-87.5. if it is an 88 then there will be no resistor pack plug, the injector clips will be red plastic and have an offset lug. 86-87.5 will have tan injector plugs with a center lug.

 

i can plug a spair N/a ecu in my turbo car and it runs.. i think you could run the motor on the turbo harness, just check for the differences and move the wires around if need be

 

I mean I don't have a turbo ecu either so I guess it doesn't matter which harness I use. But I assumed the n/a would be easier.
Anyone know if i can I use a n318 pressure sensor?

 

you can use either but your timing will be altered based on the ECU used with the pressure sensor.

actually scratch that, i only tested it on cars with a vert ECU which can accept either sensor.

 

IIRC the wiring harnesses are the same except for two wires.

That said the T2 computer should run the N/A engine just fine if you use the T2 injectors/AFM/"boost sensor" with the computer.

 

I ran a N333 in my '88 NA for a while with no issues, but I also used NA MAP/AFM/Injectors. Kinda hard to say in your case though, TII->NA rather. Should behave like a TII engine out of boost the entire time.

You could...get a set of TII irons, front cover, couple extra bits; rebuild the engine (Which you might have to do anyways), and put together a cheap TII engine. A little more money, sure. But you'll get board with 146hp pretty quick and be wanting a turbo.

 

Yeah if it comes down to needing a rebuild i'll just put a t2 engine together. So the plan for the moment is to use the n/a engine, n/a harness, n/a ecu n/a afm, injectors, and pressure sensor and it *should* work.

 

You can use the TII harness, the NA harness shares the same wire to a sensor on the power steering pump, as the knock box on a TII. Better to just stick with the TII harness and unplug the knock box.

 

problem with a TII harness is the primary to secondary injector looms are too short to reach around the intake manifold. you could lengthen the secondary injector looms.

you also would need to do the same with the BAC and AWS if you wanted them.

it's simpler to use an n/a harness on a turbo engine, not so much the other way around.

 

Gotcha. Not every day I see someone go TII->NA.

 

N/A is best way

Definitely use the N/A intake manifold. Even on a T2 engine.

 

Absolutely use the NA manifold. It has longer runners for better torque.

 

I mean to be fair when i got the car it was neither a t2 or an n/a... ofc the vin says t2 and it has t2 stuff but it was missing all of the drivetrain.

Will my t2 cluster work with n/a ecu?

 

Yeah, the gauges will work regardless of ECU since the computer really has nothing to do with them.

 

boost gauge won't operate, but it's kind of a useless gauge anyways.

 

Got the engine in.. a long ways from driving but its a step in the right direction. Even added a custom top mount turbo kit. Anyone know where i can get a dual pulley for my alt? Air pump has been (or will be) removed.