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Old 07-26-2015, 06:51 PM   #1
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Default MSM into a 99.

Ok gang, I need a bit of guidance. I have a 99 that suffered Thrust bearing failure on the Dragon's Tail in March, resulting in a fist sized hole in my #3 cylinder wall. There is pretty much nothing left on the motor that was salvageable, as once it started seizing, I decided I was GOING to make it down the mountain, under my own power... and I did. So I began my hunt for a replacement motor.

Well, yesterday I made a very nice deal with Tom of Tom's Turbo Garage To buy the MSM motor from his now LS3 powered Miata... I am getting everything from the intercooler, to the back of the motor, Harness and ECU, all of it.

I quickly realized I can't use the Stock ECU in my 99, as I do not have the immobilizer in my car. So... Here is where I am looking for some guidance from the great Turbo gods and gurus on this forum

How would you lot suggest I go about this? It is pretty much decided I will have to go with a Megasquirt in the end... Unless someone knows how to bypass the immobilizer all together, without having the actual immobilizer, ring or key... Pretty sure it can't be done.

I have been told the MSM and the 99 harness and there for MSPNPs are different. Do I keep the 99 harness in the car and try to use the 99's sensors and coils? Do I swap the MSM harness in and go that route? Do I frankenstein the two?

How do I go about this? I welcome any input I can get!
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Old 07-26-2015, 06:58 PM   #2
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When you say "harness" are you talking about the engine or chassis harnesses or both?

To answer your questions:
Megasquirt will kill 2 birds with 1 stone: eliminate need to mess with immobilizer. and replace the HANDS DOWN worst ecu/tune known to mazda, which is the MSM ecu.

Everything from your 99 should work on the msm engine including sensors/etc. You'll need to figure out a solution for the ignition coil packs though, as the valve cover is set up to take cops, and your 99 runs coil packs/wires (you can probably swap valve covers and be done the easy way). Since you're swapping stuff might as well throw on your VICS manifold onto the MSM engine as it's a lot better.
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Old 07-26-2015, 07:08 PM   #3
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I have the MSM Engine Harness coming.
I had heard the VICs intake would be better than the MSM one. And my 99 valve cover seems to be pretty warped as well. I had her at some pretty intense temps in her final 8 miles Is it possible to use the MSM Cops with the 99 harness and a MSPNP? Or should I look into buying a new VC?

In this video, you can see my new motor coming out
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Old 07-26-2015, 10:57 PM   #4
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In for details on this too. Hi Viriiguy this is maduh from the m-s.com forums!

We were pming back a forth a bit as we are both kinda in the same situation.

It was my understanding you could just swap the msm motor into the 99 and retain the stock 99 sensors/ignition and ecu harness with the 99 ecu and it wouldn't know the difference besides running poorly etc. But you would need to buy a megasquirt for a 99 car and not a MSM if you plan to go that route. Since a megasquirt built for a MSM wouldn't mate with a 99 ecu harness.

For instance I have a MSM drivetrain i want to drop into a 99. I also have a megasquirt for my msm thats already been used for some time. If I dropped the msm motor into the 99, i'd need to buy a 99 specific megasquirt over using my old MSM megasquirt correct?
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Old 07-27-2015, 12:10 AM   #5
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Hey Mazduh

I have been doing a bit of reading.. and I need to sit down with a wiring diagram for the 99 and the MSM to be sure.. But it LOOKS like we can use the MSM COPs on the 99 harness, with just a bit of rewiring.

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Old 07-27-2015, 12:27 AM   #6
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Quote:
Originally Posted by viriiguy View Post
Hey Mazduh

I have been doing a bit of reading.. and I need to sit down with a wiring diagram for the 99 and the MSM to be sure.. But it LOOKS like we can use the MSM COPs on the 99 harness, with just a bit of rewiring.
I actually think I might have found a 97 that's a better suiter. We should just make a big documented thread of both are swaps since it seems the info out there is few and far between.
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Old 07-27-2015, 12:57 AM   #7
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That is an excellent idea!

It is looking more and more like the 99 harness and the MS2 kit will work perfectly for my needs. I thought the inter-cooler would be a direct bolt in, not so much. The NB1 headlight covers the hole that is used on the MSM. So I will have to reroute the intercooler hoses a bit.
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Old 07-27-2015, 12:57 AM   #8
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yeah you can custom wire the msm cops into the 99 harness and with ms it should not be a problem controlling them
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Old 07-27-2015, 01:10 AM   #9
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Quote:
Originally Posted by 18psi View Post
yeah you can custom wire the msm cops into the 99 harness and with ms it should not be a problem controlling them
Awesome! I'll call DIYPNP tomorrow and get a kit ordered. I need to solder a few other things anyway, so may as well get my Zen on.
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Old 07-27-2015, 01:28 AM   #10
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Quote:
Originally Posted by viriiguy View Post
Awesome! I'll call DIYPNP tomorrow and get a kit ordered. I need to solder a few other things anyway, so may as well get my Zen on.
So you can for sure run the MSm motor with a 99 harness and 99 version MS?
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Old 07-27-2015, 01:34 AM   #11
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Yes because the 99 and msm uses all the same sensors, just different coil packs
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Old 07-27-2015, 01:52 AM   #12
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Awesome. Maybe I'll just stick to searching for 99's since I'm lazy and don't want to re-wire the entire car.
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Old 07-27-2015, 02:00 AM   #13
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I prefer a 99 to an NA any day... But that is just my personal taste.
This is my Ryu, just before the motor went POP!

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MSM into a 99.-80-ryus_last_ride_eaa78ee438e6838969ce12ef697fb25fc87a0ef6.jpg  
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Old 07-27-2015, 02:03 AM   #14
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Quote:
Originally Posted by Mazduh View Post
Awesome. Maybe I'll just stick to searching for 99's since I'm lazy and don't want to re-wire the entire car.
Many people will argue many things, but everyone knows the NB chassis is the better chassis.
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Old 07-27-2015, 03:11 AM   #15
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Mega squirt and LS coils? kills lots of birds with a few stones. I can send you the wire diagram if needed. 2 wires added.
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Old 07-27-2015, 07:58 AM   #16
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If you want to get it running without any messing around you can put a 99 valve cover on an MSM head and run the stock 99 coils.

I'm running an MSM engine with Toyota COPs and a 99 valve cover.
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Old 07-27-2015, 09:02 AM   #17
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That seems dangerous. The 99 Ecu isn't going to understand boost and how to keep the air/fuel right.


And Torquezombie, I would love the wiring diagram. Thank you.
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Old 07-27-2015, 10:02 AM   #18
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He's not suggesting you use stock ecu...
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Old 07-27-2015, 10:44 AM   #19
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Quote:
Originally Posted by 18psi View Post
He's not suggesting you use stock ecu...
Gotcha!! Obviously I was confused. 😀
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Old 07-27-2015, 10:45 AM   #20
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Color coded. Colors are for my '99 and LS2 coils. Just ignore the EGR part if you want. I deleted the EGR and was originally reusing the wires for ignition. Either run 2 new wires or reuse wires from stuff you are not using.
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