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Engine Swap Questions: BP + MSM head (BP4W) + Megasquirt in '90 Miata

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Engine Swap Questions: BP + MSM head (BP4W) + Megasquirt in '90 Miata

Old 11-13-2009, 01:51 PM
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Default Engine Swap Questions: BP + MSM head (BP4W) + Megasquirt in '90 Miata

With my MSM street car project nearing completion, Iím planning to start on my next build, a true full-on track car based on a í90 NA6 chassis. Right now, Iím starting on building my next motor: a built NA8C BP bottom end with an MSM head (BP4W). The motor will be a turbo motor, but is unspecified on what turbo setup to use for now as Iíll decide what to you use later. The ECU will be a 1.6L Megasquirt. I assume thatís the one I need since the Megasquirt is specific to different wiring systems per chassis (am I correct to say that?).

Here are my questions based on what I have been reading about 1.6L to 1.8L swaps:
  1. Will the TPS from the MSM work for this setup (I assume the MSM TPS is the same as í99-í00) or will I have to resort to using the NA6C TPS or the NA8C TPS?
  2. Is an additional CAS (NA6C or NA8C) needed for this swap (the BP4W head had a CAS in the front of the head)?
  3. Is it required to use an alternator from a í94-í97, or can the 1.6L Megasquirt control an NB alternator?
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Old 11-13-2009, 02:47 PM
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1. Yes (and then no to the second part). Use the entire NB throttle body.
2 No, MS2 code works with NB triggers. NA CAS = teh suck
3. You can use the NB alternator if you build a regulation circuit (which you can do in the MS' proto area), or you can use a NA alternator.
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Old 11-13-2009, 03:29 PM
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Originally Posted by Ben View Post
1. Yes (and then no to the second part). Use the entire NB throttle body.
2 No, MS2 code works with NB triggers. NA CAS = teh suck
3. You can use the NB alternator if you build a regulation circuit (which you can do in the MS' proto area), or you can use a NA alternator.
Refering to your answer in #2, you are telling me that the MS2 code can be inputted to a 1.6 version of the Megasquirt or I'd have to use another version of the Megasquirt?
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Old 11-13-2009, 03:37 PM
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You would use a MS2 Megasquirt configured to run what would essentially be a 99 motor.
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Old 11-13-2009, 07:49 PM
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You can use the 1.6 version of the megasquirt, but you'll need the FM 1.8 conversion kit. They have the parts needed for both a 99^ and a 94-97. I believe they have a writeup for it also. Theres a compatability guide somewhere too. Your build is identical to mine. 90', swap, ecu and all. I doubt I even helped here. http://flyinmiata.com/index.php?dept...0%20%201994-97
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Old 11-13-2009, 08:06 PM
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Originally Posted by Sam Amporful View Post
You can use the 1.6 version of the megasquirt, but you'll need the FM 1.8 conversion kit. They have the parts needed for both a 99^ and a 94-97. I believe they have a writeup for it also. Theres a compatability guide somewhere too. Your build is identical to mine. 90', swap, ecu and all. I doubt I even helped here. Flyin' Miata : Engine conversions : 1.8 conversion : 1.8 conversion kit
Completely wrong. Nothing needed here except maybe the EGR block off plate, and maybe the coil bracket--that's only if you're using the stock ignition.
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Originally Posted by concealer404 View Post
Buy an MSPNP Pro, you'll feel better.
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Old 11-13-2009, 08:26 PM
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Originally Posted by Ben View Post
Completely wrong. Nothing needed here except maybe the EGR block off plate, and maybe the coil bracket--that's only if you're using the stock ignition.
Like I said, I doubt I helped lol
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Old 11-13-2009, 10:22 PM
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i'm kind of in the same situation. i'm going to be swapping a 1.8 into my 93, do i need to use a megasquirt for a 90-93, with an msq for a 1.8?
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Old 11-14-2009, 02:35 AM
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1. I don't see why you couldn't wire the TPS into the 90 circuit, i wired my 99 TPS into my 90 harness.
2. I have a mspnp, using a 1.6 CAS on the back of a 99 head in a 90 car. Works fine.
3. I had both a 94-97 alternator and a 90 alternator in my 90 car (with a 1.8 motor w/99 head). The 1.8 alternator, early one (94-97) had a slightly smaller contact point where that small 10mm bolt goes. Drilled it out and it fit/worked fine. However, if you are going to use a 1.6 alternator you will have to have the water pump pulley and crank pully from the 1.6 since the belts are different. A long/big/whatever 91.5+ 1.6L will work. I am currently doing it.
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