psyber_0ptix

iTrader: (4)

Wow, first post full of technical questions. You'll learn quick as long as you address things one at a time.

Right now reading these posts, it's a little distracting like a Jack Russell terrier with ADHD on speed. Get the motor in the car, use the stock wiring with a 90-93 MS3x and then hit the search button when you run into particular snags.

psyber_0ptix

iTrader: (4)

What have you been reading. Honestly, having run all of them, I'd recommend the Toyota Cops over the Fab9 coils. Now I've moved onto LSx coils and couldn't be happier but that's because Toyota COPS where incompatible with the VVT valve cover. Fab9 was just a band aid and I wasn't satisfied with an o-ring keeping the coil in place.

shuiend

iTrader: (24)

Run your stock 1.6 coils. You are over complicating things.

OGWar

ADHD and speed? I've never gotten that one before haha.

Sorry, don't mean to be sporadic, just lots of things to think about. I'll keep a post to one question from now on. It's really the 1.6 coils onto a 1.8 motor that I should have focused on, that's currently where I'm at. I know I need a bracket to use the 1.6 coils. Is switching the signal wires to match the 1.8 plug order (per flyin miata's how-to) neccessary if using a standalone? Or is it really as simple as braineack stated, just get the 1.6 coil pack on the motor and keep the plug wires running to the same cylinders as they were on the 1.6 motor...forget about how the coils/wires were orientated on the 1.8 altogether.

codrus

Heh, speed is actually what they use to treat ADHD. A Jack Russell terrier with ADHD on speed would be... A Jack Russell terrier.

--Ian

OGWar

Learned something else new.

[grabbing coat to head to local "pharmacist"]

psyber_0ptix

iTrader: (4)

Just transfer the stuff from the 1.6 to the 1.8. Electronics don't give a **** about piston bore and slightly longer block when everything else runs the same. wire in your tps and come back when you have real problems. Also don't bother with the pencil coils from fab9. If you're having trouble figuring out the engine swap, don't make it more complicated than it is.


I'm not a dog owner or user of ADHD meds, I was grabbing at the stars.

OGWar

I didn't mention piston bore or block length. I know electronics don't care about that stuff.

But a 1.8 vtps is 4 wire, whereas a 1.6 pigtail and tps is 3. I can find how to hook the 1.8 pigtail to the 1.6, just didn't know if there was another step on the megasquirt end where the harness plugs into the ms box itself or if it was internal. Everything I've found regarding this issue isn't clear. Just looking for advice from someone who's done the swap and used the 1.8L vtps with a mspnp2 setup is all.

For the coils, I think I got my answer. Use the 1.6 coils and don't worry about switching the signal wires to match the 1.8 coils. Use spark wire->cylinder orientation same as the 1.6

psyber_0ptix

iTrader: (4)

What's the physical difference of the 1.6L and 1.8L motors? Why would you need to change anything form the harness/computer side?

Try running an NB throttle body. 3 wires just like the 1.6

bingo

aidandj

iTrader: (5)

I even have an NB throttle body I would sell you, just got a spare. (you would have to source your own TPS, this one is toast)

OGWar

Thank you for the info.

Here's the link to what I was reading about splicing the 4 wire from a 94-97 to the 3 wire from my stock harness. The 4th red wire on the 94-97 tail goes unused. They reference changes made on the megasquirt side for the DIY units, which is what caused me confusion.

http://www.mx5nutz.com/forum/index.php?showtopic=75646

I'll have to look into that. I'm honestly not sure what's different about an nb throttle body vs a 1.8 na. Without a working 3 wire vtps on it anyways, it would only be 1/2 the equation.

Really, everyone, I appreciate the feedback. It helps!

shuiend

iTrader: (24)

The NB throttle body has the IAC built in so you don't have to plumb a hose to get air, the NA one you need to run a hose to the intake tube for air. The NA 4 wire TPS can be wired with just the 3 wires same as the NB to work with a MS.

OGWar

Not having to run a separate hose to the intake tube would be a nice option.

I was looking through the gen2 manual, there appears to be more than just splicing the 4wire vtps to the 3 wire pigtail of the 1.6 harness, but it lays it out pretty clear about what you need to do to make it work.

the vtps on the NA 1.8l is not a direct fit onto an NB throttle body I'd imagine, so i'd need to find a tb/vtps combo from an NB.

shuiend

iTrader: (24)

All 1.8 TB have a VTPS, we just call them a normal TPS. Both wire into the MS the same way. You would cut off the plug on your 1.6 harness, and then just wire the the new 1.8 plug to the existing wiring harness. There is one wire for power, one wire for ground, then a signal wire back to the ecu. Then at the ECU side for the patch harness you would just wire in the signal wire to the idle wire on the MSPNP2.

I would also say to go buy a MS3X now and skip the whole MS2 line. For a quick comparison, the MS2 platform is like buying a xbox360/playstation3 while the MS3 platform is like buying a XBone/playstation4. Both will run your car, but the MS3 is the one that is still getting developed, with occasional back ports to MS2 if they have time to do it.