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MSM engine in 91 NA, I Have questions.

4K views 35 replies 17 participants last post by  Mitchy.Snitchy. 
#1 ·
Ok so i was looking around and had the idea, maybe I should put a Newer 1.8 out of a 04-05 Mazdaspeed in my car.

I DID search on here a bit and a little on m.net but i still have a few questions.

1.DO you guys think its a good idea
2.To do the swap was thinking of basically swapping everything over from a wrecked MSM(rear ended) engine+trans, full wire harness, cluster. (maybe even dash)
3.Could I still retain my 1.6 rear end. Or would it just be best to swap the rear of the MSM in there?


I'm really thinking of going this route, the best miata engine (in my opinion) in a classic red Na just sounds a bit awesome to me. Plus turbo power:)


Don't flame me on this:whistle:
 
#2 ·
most of the time it wouldnt be worth it, but since you have a whole msm id say maybe depending on if you think its worth it to get minimal gains over a stock nb bp

when you could just get a nb bp turbo it (to your liking) instead of swapping out a whole wiring harness and being stuck with a meh turbo until you replace the exhaust manifold and downpipe

if your strapped for cash and have plenty of spare time and have your heart set on it, id say yes. Otherwise id say get a nb bp motor and turbo that and save a lot of time.

just my 2 cents
 
#5 ·
I basically have the MSM for the engine+trans+dash+harness+ecu+exhaust (can get these)
I don't want to do a turbo build myself cause I'm just lazy.
Plus, I'm not this power hungry guy I'm fine with stock Na 1.6 power all 70hp my car probably had when it was running.

But I drove a MSM and I just fell in love with that engine in stock form. I'm a sucker for OEM+ as well.
 
#21 ·
If you do the swap, you need the mobilizer and ignition set so the motor can start. It's a fail safe system that i heard some can bypass. Then again, you said your ignition is going to be from your motor.
 
#23 ·
Please, don't do that. Use the OEM NA ignition, the NA harness, and run a standalone. It's the easiest way. The OEM MSM ecu is garbage and you'd have to swap the entire wiring harnesses to use it, which is a pain in the ass.

Unless you're saying you're using the MSM coils with a standalone, in which case it's fine.
 
#24 ·
Ok, Ill explain again.
Basically I have a full MSM with a wrecked rear end and EVERYTHING is still intact. all i have to do is switch it ALL over to the na
 
#25 ·
Right, I'm telling you the OEM MSM ecu is a pile of ****. In order to use the OEM ecu, you'd have to switch the entire wiring harness over (immobilizer, engine sensors, ignition, etc). It's much easier, and better in the long run, to run a megasquirt. They're cheap, you don't have to swap any harness over, many people can tune them, and you'll never be hindered by lean-tip in, TPS problems, crappy running conditions, etc like you will with the OEM MSM. There is a reason it is highly recommended to replace the MSM ecu.
 
#30 ·
You are correct the OEM MSM ecu is a pile of junk.
 
#26 ·
But, I do plan on doing the full harness conversion. So i can tuck some wires blah blah. And thanks for the heads up on the MS
 
#27 ·
To go through all that trouble for a MSM engine stock is not worth it. The MSM needs to be modified to be worth it but when you begin to mod it you begin to run into a bunch of problems.
 
#33 ·
Biggest downfall on the MSM is the ecu. Get a stand-alone like the Hydra or something. If your going to keep the MSM essentials in the NA mostly stock then you should be fine. Just be weary of running lean. Maybe see if you can find some bigger injectors. The stock ones are 265cc and the biggest you can go on the oem ecu without running into problems is 321cc.
 
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