1.8 swap

[GTOTT97]

So I've read up on flyin miatas swap method, is it possible to use a 1.8 engine harness and EC you and connect that to the 1.6 body harness so that you have the proper ECU


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[iscariot]

The engine harness is wrapped up and spliced together with the main harness. There are easier ways to do the swap than the FM parts.

[GTOTT97]

The engine harness is wrapped up and spliced together with the main harness. There are easier ways to do the swap than the FM parts.

So then couldn't you take a full 1.8 body harness and put it into a 1.6


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[iscariot]

You could - but there are a few interconnects to the dash harness that don't even line up between 94 and 96. It's just a lot of work to try and run a 1.8 ecu that honestly isn't much better than the 1.6.

[GTOTT97]

What other options besides the FM kit is there?


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[iscariot]

I swear I've seen it mentioned a few places, but for the life of me I can't find it. It might've been a racecar mod where you won't care about idle air control and a/c.

[FE3tMX5]

Use all the 1.6 sensors on the 1.8 engine. Done. That's the typical simple and budget approach when swapping in a similar engine. It's what I did with a 2.0L Mazda engine swap.

[Stealth97]

I know people do it with success, and I know how much work it is, but I personally would not run a 1.8 on a 1.6 ECU. Look hard as buffering for a megasquirt.

[metalman]

Use all the 1.6 sensors on the 1.8 engine. Done. .

This is what I would do IF I was giving up my 1.6, which I wouldnt. Megasquirt is next option if you want more fiddling.
Otherwise if I really require a 1.8 motor I would just buy a 1.8 car. A full harness swap is too much trouble for too little benefit.
If I did a Megasquirt then I would also do a VVT swap. NA8 motor is not an upgrade to a 1.6 IMO

[iscariot]

The FM kit is less expensive than I recalled - for some reason, $300 was in my mind. The only major difference between the 1.8 and 1.6 is the idle control electrical-wise. You can make a case for a heated wire MAF being less restrictive than the flapper AFM - but if you're concerned about power you'd be better suited going megasquirt and VVT.

[GTOTT97]

1.8 swap

I've got a 99 1.8 lined up with its trans still attached, 125k with a new head gasket, timing belt and water pump done at 100k, I ordered their kit today but it's backorder for a bit. Eventually I'll do a MS2 or MS3 but for the time being I'm trying to do this as low cost as I can, last things on the list are a 94-97 cross over pipe, 94-97 alternator and the MSD parts Flyin suggests to make VICS work. I'm not quite sure what I'm going to do for header however.


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[kung fu jesus]

The '01-05 OE header is quite good and worth it, unless you want to pay more for the aftermarket headers.

[GTOTT97]

The '01-05 OE header is quite good and worth it, unless you want to pay more for the aftermarket headers.

How would I go about making that mate up to an exhaust system? I picked 94 to 97 manifold, because flyin miata said with a cat it would bolt straight to a 1.6 exhaust


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[miatastuff]

I've got complete 99 or 01+ exhausts to bolt to the 99 motor.

[metalman]

How would I go about making that mate up to an exhaust system? I picked 94 to 97 manifold, because flyin miata said with a cat it would bolt straight to a 1.6 exhaust


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That solution makes the most sense and is cheapest. You also need the 1.8 down pipe and cat or test pipe.