I've been doing a bunch of research but still have a few questions related to the Cam Angle Sensors in the NB. But first, some background. This is a bit long winded but I want to keep all of the relevant info for the 1999 and possibly 2000 in one place...
I plan on using Megasquirt 1 (3.0 PCB) with only fuel control first, then spark+fuel, then spark+fuel+turbo.
The '99 uses the BP-4W engine which doesn't have Variable Valve Timing (VVT) but does have a Variable Intake Control System. Apparently VVT was introduced on the 2001 model (BP-Z3 aka BP-VE) In case anybody is interested, Wikipedia has a lot of good info including the following
In 2001, Mazda introduced the BP-Z3 (also called BP-VE) variant of the BP engine with S-VT variable valve timing on the intake side, but no more VICS. This was found in the 2001+ Miata. The Z family is an evolution of this engine.
I'm not an expert solderer so I'm going with the prebuilt Megasquirt 1 with 3.0 PCB from DiyAutoTune (link)
So, it looks like the Hall effect sensor was removed according the Miata Engine History Page
The 1999-00 Miata... hall effect cam angle sensor (CAS) was removed from the back of the head and replaced with a magnetic sensor and toothed wheel on the front of the crankshaft (a second magnetic sensor was added to the intake cam gear pulley to verify timing)... 99-00 uses a second timing sensor in the intake cam sprocket in addition to the crank sensor.
Which means I'm going to have to swap out the magneto-CAS for the optical Hall Effect version from earlier engines.
How much does an NA CAS cost?
Am I going to fry my 1.8 coils when I go spark?
I've heard of some issues with the VVT and spark, those don't apply to 99-00s right?
Should I start with the default firmware if I'm only doing fuel at first? Or should I go MSnSE from the get go?
How much rewiring is required if I go with the prebuilt DIYAutoTune kit
Thanks for any help here, I plan on putting together a build log so future squirters have an easier time.