Installing an NB (99-00) Engine Into a NA Miata (94-97)
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- Опубликовано: 13 окт 2024
- In this video we document all the steps needed to install an NB engine (BP4W) into an NA miata (1994-1997). Below is a complete parts list, it's not a difficult swap to perform but it does require knowing exactly which parts you need from each engine and a couple simple modifications. If you feel any details are missing or overlooked please drop a comment and we will answer it.
Check list for NB to NA 1.8 engine swap
NB Parts Needed
o Motor mounts (passenger side, driver is the same for all 1.8)
o Intake manifold
o Crank Pulley
o Fuel rail (99-00) required for any NB engine
o Fuel feed line with quick connects
o Injectors
o Lower Radiator Hose
NA Parts to Re-Use
o Throttle body w/all NA sensors
o Cam sensor
o Injector harness
o Exhaust manifold
o Alternator
o Fuel pressure regulator (install onto NB fuel rail and run custom return line)
o Coolant Temp sensors (both for the gauge and ECU)
o Power steering pump
o Oil pressure sensor (1994 only) 95+ is same as NB
o Upper Radiator Hose
Tags: NA8 NB1 1994 1995 1996 1997 1998 1999 2000
That’s was a great Video , I was panicking about to buy 97 engine for double the price of a 99 engine now I can buy NB engine to save some money thank you
i’m going to get my low mile bp4w today and this helped me feel better about the swap thank you !!
Great video! Thanks so much. I used this as a starting reference for putting a BP4W in my '94. Only thing I would say is that in my case, I definitely did need to swap my old coil pack over to the NB engine. With the NB coil pack, car would run for a second and die immediately with fault code 1 - no IGF signal. The old coil pack solved that problem immediately.
Yeah 94-95 have a unique coil pack, that can be annoying!
This video will help a lot in my upcoming swap! Thanks!
Doing my swap right now! you're video has been phenomonal! just wondering, how did you deal with the different vacuum line setups? did you use the vacuum pump from the NA intake?
only thing im concerned about is my vacuum line routing so far.
I had to move and extend a few vacuum lines but everything hooked up as far as I can remember
OK, first off - thanks for a great video and list of parts.. But what happens when I turbo that engine before installing it? Im planning a Kraken full kit with COP and MS3 ecu... do i still change over the valve cover? Am i using the crank angle sensor now? What gets handed to the MS3 to take care of vs me having to retro it off the engine to mate up with the NA8 ecu?
Unfortunately there’s no simple answer for you here, you have a lot more options with the MS3 you can run either the NB or NA sensors, just make sure you get an MS3 that matches the model year of your chassis or it won’t plug into the harness at all.
Very informative!!! 👍
Thanks!
I saw a comment that you said you got the EGR to work! But is it needed? I was doing some research and some people say that it will throw a code.? And it’s also good for fuel economy if you leave it on there? Also if I use the Dremel and I get it to work, does it just bolt up like a direct fit. Thank you!!!
You don need it. It’s just for emissions. It will set a code if you don’t have it. I had to bend the tube slightly but it will basically be a direct fit
Any downsides to deleting EGR? Could you simply not machine a spacer to allow the NA EGR valve to physically fit the back of the intake? Also, did you need to deal with VICS at all?
I didn't do anything with VICS it just left in the default "high RPM" mode. Only downside to deleting EGR is emissions and maybe a CEL. You can make it fit pretty easily by a spacer or grinding the intake a little.
In the middle of this now. Did you switch the crank position sensor? The CPS and the crank pulley itself on the NB engine is different but it still plugs into the NA wire harness... Seems like it will work.
It will run just fine with no CPS, it will set a harmless engine light. We ended up adding a CPS later, shouldn’t matter which generation
Thanks again. This video saves hours of reading through arguments on forums.
@@immortanautomotive9221 Got this thing running! FYI I think you do need the NA CPS to get rid of the CEL. I'm running a brand new (aftermarket) NB CPS and getting the CEL for it. I think it might just be safest to swap the NA CPS and NA Crank Pulley. If you look closely, the teeth on the NA and NB crank pulley are different. The NA teeth have slopes (like cam lobes), whereas the NB pulley are more like tabs. I think this means that the NA ECU gets different single types (maybe sine waves) than the NB ECU. Thanks again for all the pointers.
Do you think the throttle cable will work with the 1.8s other throttle body that only has one slot instead of the two slot that you have on the car?
I think so
Hello, Not sure if you will see this, In the middle of swapping a BP4W into my 97 NA. what did you do for the fuel rail harness? My NA doesnt have any connectors that will plug into the 99 fuel rail.
I also swapped the 99 Fuel pump into the NA to convert to returnless system. Kept the 99 Dampner on the Rail. I also had to swap my 97 Trans onto the BP4W as the tail is slight different.
TIA
The NA injector harness will work on the BP4W, I’m not sure why you’re running into problems, I have a BP4W engine and 99 transmission in my NA. It’s all plug and play.
@@immortanautomotive9221 I'll have to go look again, my issue is the harness goes out to the front but I have no connectors over there. two for the TB, then two connectors run over to the Left side of the block, I presume one is the Crank position sensor, another is a 2 pin connector.
You said you didn't have to swap the coil packs but the na has 4 pin and the nb has 3 will it still work properly? I'm have an issue where my 3rd cylinder is barely firing not sure what it's
I have another video detailing the difference in coil packs, that will explain everything. Also coils fire in pairs so if only 1 cylinder isn't firing it's not the coil at fault.
Hello! Not sure if you'll see this post, but will the VICS run easily with a custom ECU? (Speeduino)
I’m not sure if speeduino can run that but a more advanced standalone can
There are multiple variant's of the 1.8L NB engine that are not covered here.
You’re right, this is specifically about NB1, my title was a bit too general, updated now thanks!
So the nb doesn't require much change at all for wiring? Specifically nb1, do you need a tune up after?
No wiring changes or tune required
Ok I’m pretty new at Japanese stuff but will this work in my 92? I have an 99/00 motor with cam sensor in the front but want to put it in my 92. Thanks
Yes BUT you will have to do some additional steps. Flyin Miata sells a kit you will need to convert a few 1.6 specific things.
Thanks for the help! I got a kit coming. Thank you.
Hello, I will try to swap my nb 1.6 engine to my "new" 1.6 na and put the old na engine to my nb :D I have to buy some items before ? Thank you :)
The NB 1.6 has some major differences, and don’t know everything off the top of my head but it’s very involved I believe you need to swap the intake cam and several other things
Great info! Has anyone gotten the EGR to work?? Maybe just keep the NB EGR valve and splice the wiring, and get a custom EGR tube?
We did end up getting the EGR to work, we had to clearance the intake manifold a little to fit the NA EGR, and then heat and bend the tube slightly for it to fit and connect properly
@@immortanautomotive9221 got it that makes sense. Thanks for the tip.
How did you make room for the EGR? I'm guessing a Dremel?
Yep
@@immortanautomotive9221 I'm about to do this swap. Any guidance on the grinding? Did you grind the EGR, manifold, or both?
What do you look up to find that fuel hardline? I’m having a hard time finding it and I can’t connect my last fuel line without it
Male quick connect hard line, I think it’s 5/16” but I’d double check before you order it
5/16” quick connect fuel line. Dorman PN 800-159
Where did you get the EGR delete plates from?
I made them myself
what about swapping 99 nb engine to 90 na? is there big differences compared to everything in this video?
Yes there are a lot of big differences and a few custom parts required, flyin miata has a detailed write up about it and will sell you a kit with the required parts
@@immortanautomotive9221 thanks
So you didn’t have do anything with the crank sensor?
I ended up swapping the crank sensor to the NA one just to get rid of the check engine light but it will run without it
Was ‘98 an orphan year?
In the US market there is no 98 model year. Miata’s were sold in 1998 but they all show 99 on the paperwork for some weird reason.
do i want then VICS to stay open or closed and how do i force it to stay that way?
You don’t need to do anything, it will stay closed automatically
got everything bolted up and it started but is only running on one cylinder :/
Uh oh, time to start double checking everything, it’s probably something simple that went wrong.
You should run a compression test just to rile that out
forgot to update , injectors were stuck and it’s running great now for 800 miles or so
I’m not getting spark and I’m confused
Gotta just start double checking every thing, there’s no shortcut
@@immortanautomotive9221 6 months later update I had one of the the coil pack connectors plugged into the cas smh 😭
What about VICS?
You won’t be able to run that without additional wiring and a stand alone ECU unfortunately. This write up is to run it on the stock ECU
You can use rpm switch
Na ecu or nb ecu?
NA ECU