NB miata firewall routing question.
#1
NB miata firewall routing question.
So I知 trying to work towards my first turbo build on my 1999 NB and I知 having trouble finding where exactly to get the wires and vacuum line through the firewall for the gauges. I知 trying to avoid cutting new holes if I can.
I致e looked on the forums but most posts are nonspecific about which car (NA/NB) they池e working on, and I couldn稚 find any good pictures or descriptions of where specifically to do this on an NB. I even tried watching YouTube videos of people showing off their builds for a chance glimpse of how they got through the firewall.
Do any of you NB owners have a good picture and description of where you went through the firewall?
I致e looked on the forums but most posts are nonspecific about which car (NA/NB) they池e working on, and I couldn稚 find any good pictures or descriptions of where specifically to do this on an NB. I even tried watching YouTube videos of people showing off their builds for a chance glimpse of how they got through the firewall.
Do any of you NB owners have a good picture and description of where you went through the firewall?
#2
Follow the OEM wires to a factory grommet.
Either pry the grommet open a bit to fit the extra wire in there, or cut a fresh one.
For MAP hose, there should be a few blanking grommets, just remove one of these and replace it with one with a hole and feed the map hose through.
Both methods of course you'll need to reach around and find the other end of the wire from inside the car and pull it through.
on my NB I just fed the MAP hose in through one of the blank grommets near the washer bottle.
Easy to reach, and also means the hose comes out right behind the glovebox, just above where the ECU is. (RHD)
Either pry the grommet open a bit to fit the extra wire in there, or cut a fresh one.
For MAP hose, there should be a few blanking grommets, just remove one of these and replace it with one with a hole and feed the map hose through.
Both methods of course you'll need to reach around and find the other end of the wire from inside the car and pull it through.
on my NB I just fed the MAP hose in through one of the blank grommets near the washer bottle.
Easy to reach, and also means the hose comes out right behind the glovebox, just above where the ECU is. (RHD)
#4
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next to the clutch master, there is a big ribber grommet where the factory wires go through.
make a new hole in the side of that large rubber grommet and push the vacuum hose though.
it will exit near your clutch pedal.
you can see this large grommet to the right of the clutch cylinder in the pic below
make a new hole in the side of that large rubber grommet and push the vacuum hose though.
it will exit near your clutch pedal.
you can see this large grommet to the right of the clutch cylinder in the pic below
#5
I ran my on the opposite side (left) side of the brake master. Removed one of the rubber plug/grommets and wrapped my cabling in some high temp, abrasive resistant sleeving I picked up from McMaster-Carr. This routes to a hole right above the gas & brake pedal.
#6
Mine was for Right hand drive.
But some of the confusion is my fault, since while I knew the LHD/US cars had the ECU behind the dash, I always thought it was behind the passenger side of it (so, right hand side for US)
Didnt realise the US ones had the ECU on the left as well (must be tight in there with steering and ignition wiring there too?)
(for reference, RHD NA/NB have the ECU on the left hand (passenger side) footwell, behind a metal plate that doubles as a footrest and ECU cover, my mistake in that I assumed the ECU position to jsut be mirrored on LHD)
#9
#10
I have come to the conclusion that Mazda's R&D department must have just had a big diagram of the car printed up.
And when it came to the LHD design they said "ok Jim, your turn to pick where the ECU gets mounted on this model. here's your blindfold, and a dart, start throwing!"
"great throw Jim, behind the seat for some reason, PERFECT!"
And when it came to the LHD design they said "ok Jim, your turn to pick where the ECU gets mounted on this model. here's your blindfold, and a dart, start throwing!"
"great throw Jim, behind the seat for some reason, PERFECT!"
#11
My car is a 1999 NB and I live in the US. My ECU is mounted kinda above and in-between the clutch and brake pedals on my LHD car.
I used that cone shaped rubber grommet to get all my cables and vacuum lines through. Diyautotune has good pictures in their 99-00 MSPNP2 installation guide of all the info I needed to install these guages (and immediately following, my ECU). Here's the link: MegaSquirtPNP by DIYAutoTune.com
Also, idk how I didn't see that grommet before. I must be blind and retarded.
I used that cone shaped rubber grommet to get all my cables and vacuum lines through. Diyautotune has good pictures in their 99-00 MSPNP2 installation guide of all the info I needed to install these guages (and immediately following, my ECU). Here's the link: MegaSquirtPNP by DIYAutoTune.com
Also, idk how I didn't see that grommet before. I must be blind and retarded.
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