Question about a 1.8 swap.
 

im not sure if this is the right place to post this but, i found a 2002 miata wrecked in the back and hes selling it cheap. the motor, drive shaft, and diff. are all in good shape.

i have a 1991 miata, exactly how much work and what extra parts would i need to swap the 2002 1.8 ( engine, breaks, and rear-end ) into my 1.6 car?

thanks for all the input, it will all help in some way.

All bolt in stuff.

You'll need the swap kit from Flyin' Miata for the motor...has some adapter brackets and such...under $200.

There are write-ups on the brake and diff swaps as well.

The 2002 has VVT. Is there a way to control that in a 1991 now, without having to rewire for the 2002 ECU?

Flyin' Miata : Tech: 1.8 conversion
thats what iv read so far and it says..
"The 2001-05 heads also have Variable Valve Timing, which is a problem unless you have an aftermarket ECU like the Hydra Nemesis to control it. "

Take the diff/axles/driveshaft/brakes and sell everything else. If you want a 1.8L you can pick up a used 94-97 for $350 or a 99-00 for $900 with the better flowing head. If you are staying NA, just get a 94-97. Both of those engines will work with your current setup without the need for an aftermarket ecu.

'Doh

Yeah...that would be a problem.

Call DIYAutoTune. They have a module that will run VVT in closed-loop mode. It's intended to operate alongside a MegaSquirt, but I expect it could be made to work with any ECU, including a stock one.

Obviously you will not be running with optimal fuel & timing curves if you use a 1.6 ECU on an '01+ motor. Probably not a massive difference, though a few HP are being left on the table.

The NB alternator is also a problem, as it's controlled by the ECU. You can't just install the 1.6 alternator directly, as the pulley is different (V-belt vs. ribbed belt) though I've heard folks mention swapping pulleys. Never tried it, no idea if it works. If you can find a '94-'97 alternator, that'll bolt right in with no hassle at all.

Though in the end, I have to agree w/ rharris. Unless your 1.6 motor is dead or dying, sell the NB motor and use the money to turbo what you've got. Much better ROI.

Agree with what Mr. Perez said, I would only add that in any event, if considering an entire driveline swap and the undertaking of a massive project, stripping out the wiring harness, etc. Is likely a better solution in every possible way than hacking together pieces from several years of Miatae.