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Old 10-06-2011, 01:01 PM   #1
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Default MSM engine swap in 90 Miata

I signed up for the forum a few years ago but I haven't been active aside from browsing every once in awhile. I am preparing to swap a Mazdaspeed engine in my Miata and figured I would post the progress here for whoever is interested.

This is my Miata, 1990 that I use for rallycross.









I recently picked up this to transplant in for a little extra power. I got the whole swap (engine with all accessories, intercooler and piping, and complete exhaust) for around what a 1.6L GReddy turbo kit goes for.












I also have a Mazdaspeed suspension setup to go on the car.


I am going to use Megasquirt to control it and ditch the MSM harness and ECU. Basically it will be treated as a 1.8 swap with an aftermarket turbo. I still need to figure out a few details such as what coils/sensors to keep from the MSM engine and what to swap over from the 1.6.
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MSM engine swap in 90 Miata-img_20110625_194330.jpg   MSM engine swap in 90 Miata-dsc_0250.jpg   MSM engine swap in 90 Miata-img_20110914_162506.jpg   MSM engine swap in 90 Miata-img_20110914_162443.jpg   MSM engine swap in 90 Miata-img_20110914_162457.jpg  

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Old 10-06-2011, 01:04 PM   #2
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so you got the whole setup for just over 1k? sweet deal.
good luck
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Old 10-06-2011, 01:13 PM   #3
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Yep, $1100 for the whole thing.

I am not going to use most of the things. I will use the 1.6L CAS, OPS, CTS, etc. I am going with different intercooler piping and a MAF delete. I also don't need the PS pump or AC compressor since my car has neither. Also need to switch to a 94-97 alternator.

I am probably going to use the coils from the MSM, I just need to figure out how to wire them.

Also going with an aftermarket BOV to replace the broken stock plastic one.
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Old 10-06-2011, 01:26 PM   #4
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why not retain the msm wiring and run diypnp ms2extra using the NB sensors which work a LOT better than that POS na cas?
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Old 10-06-2011, 01:42 PM   #5
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Ease of installation/get it running quicker/I just bought a 90-93 MSPNP.

I am only looking for <200hp for now. Later on I will probably upgrade and use the MSM sensors and build a more capable MS.
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Old 10-06-2011, 02:24 PM   #6
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Damn! im jelly you got a deal that good! hmm interesting. any reason why you picked the 1.6 MS over the 1.8 MS?

also, do you know if the 1.6 and 1.8 (na) CAS are the same thing? thx
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Old 10-06-2011, 02:27 PM   #7
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they are both crap.

i suggest you "do it right the 1st time around" but that's just my opinion
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Old 10-06-2011, 02:50 PM   #8
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Quote:
Originally Posted by blindboxx2334 View Post
any reason why you picked the 1.6 MS over the 1.8 MS?
I picked the 1.6 MS to get it running with the 1.6 in my car now. When I swap in the 1.8 I will just have to retune it.
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Old 10-06-2011, 03:51 PM   #9
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hmm thats cool. i didnt know you could run a 1.6 MS on a 1.8.
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Old 10-06-2011, 04:25 PM   #10
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(Posting from my phone.)

Thumbs down on ms1 running a cas. Should have gone for a diypnp running the msm crank/cam sensors.
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Old 10-06-2011, 04:26 PM   #11
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Quote:
Originally Posted by blindboxx2334 View Post
hmm thats cool. i didnt know you could run a 1.6 MS on a 1.8.
In most cases you choose the ECU based on the year of the chassis of the car for wiring harness compatibility and make adjustments and modifications as needed from there. So a 1.8 engine in a 1.6 chassis would use a 90-93 ECU and (for a random example) a 1.6 in a 1.8 chassis, or a rotary even, would use an ECU for whatever 94-05 chassis it is, and so on and so forth.

Good luck with the swap!
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Old 10-06-2011, 04:31 PM   #12
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(Posting from my phone.)

But the mspnp cannot read the NB sensor until it's upgrade to msII
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Old 10-06-2011, 04:39 PM   #13
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Quote:
Originally Posted by 18psi View Post
they are both crap.

i suggest you "do it right the 1st time around" but that's just my opinion
Quote:
Originally Posted by Braineack View Post
(Posting from my phone.)

Thumbs down on ms1 running a cas. Should have gone for a diypnp running the msm crank/cam sensors.
Quote:
Originally Posted by Braineack View Post
(Posting from my phone.)

But the mspnp cannot read the NB sensor until it's upgrade to msII
I agree with these guys
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Old 10-06-2011, 04:50 PM   #14
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Thanks for all the feedback.

I am going with the MS1 and CAS for ease of installation as stated before, I know it isn't the best option available.

I still have the option of DIYPNP and the NB sensors since I haven't started the swap yet. What changes to the 90 harness are needed to run it? Would I just run the wiring for the MSM sensors directly to the MS and not use any of the factory connections (except the plugs at the sensors of course)?
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Old 10-06-2011, 05:06 PM   #15
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well you could just use the msm harness and get a diypnp and it will all just plug-n-play iirc.
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Old 10-06-2011, 05:38 PM   #16
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(Posting from my phone.)

Not much you'd have to run. Just two wires to run seq. Injection.
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Old 10-06-2011, 05:52 PM   #17
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Quote:
Originally Posted by 18psi View Post
they are both crap.

i suggest you "do it right the 1st time around" but that's just my opinion
by doing it the right way do you mean just using the NB CAS? if not, then what do you mean?
Quote:
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(Posting from my phone.)

Thumbs down on ms1 running a cas. Should have gone for a diypnp running the msm crank/cam sensors.
now im confuzzled. cause he said he was going to run the 1.6 CAS....?

can you run the 1.6 cas and the msm crank sensor?

Quote:
Originally Posted by RotorNutFD3S View Post
In most cases you choose the ECU based on the year of the chassis of the car for wiring harness compatibility and make adjustments and modifications as needed from there. So a 1.8 engine in a 1.6 chassis would use a 90-93 ECU and (for a random example) a 1.6 in a 1.8 chassis, or a rotary even, would use an ECU for whatever 94-05 chassis it is, and so on and so forth.

Good luck with the swap!
hm, that doesnt make too much sense to me...

example:
1.8 na chassis with nb1 motor: why would you buy a 94-97 ms, when it seems as if it would be much less of a headache to buy the computer that's specifically made for that motor (esp. since its a completely diff motor, and 1.6 ms with a rotary??? now im really lost ) plus then wouldnt you run into tuning nightmares? (trying to get a 1.6 computer to tell a 1.8 how to run). and to my understanding, it will pretty much be plug and play (MS to engine harness) if you match the correct computer to the engine, i also dont see why youd create that other headache for yourself...

(im not trying to stir some shitz up. im just trying to learn)
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Old 10-06-2011, 06:00 PM   #18
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99-00 nb and all msm's use a crank angle sensor and a cam sensor on the front of the engine and not a traditional CAS like the na's use
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Old 10-06-2011, 06:07 PM   #19
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Quote:
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99-00 nb and all msm's use a crank angle sensor and a cam sensor on the front of the engine and not a traditional CAS like the na's use
yeah, the front of the valve cover, intake side, on the nb1 is the cam angle sensor right? why is the nb1 better than the na cam angle sensors?? does the oil just like to seep through the o-ring or something?

and do the na's even have a crank angle sensor? sorry for all the ?'s i just get more confused the more i learn.....
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Old 10-06-2011, 06:11 PM   #20
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the CAS is run off the timing belt, so there is timing error due to jitter.
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