Originally Posted by cpierr03 (Post 1502028)

You're better off wiring directly to the ECU

Originally Posted by Reverant (Post 1502033)

I also replied to miata.net but my reply there awaits moderation.

This won't work, you can't plug in a wideband sensor as-is to the Megasquirt, you need to get a gauge (controller) that will connect to the sensor, and the controller will output a single signal wire to the Megasquirt.

Originally Posted by HmoobDude (Post 1502036)

You shouldn't have to splice any wires of the WB harness. I'm not too familiar with your WB, but just glossing over the images, it looks like it should be wired up so:

• 2 Connectors in Red connect to one another
• 2 Connectors in Blue connect to WB Gauge
• Wires in Green are your output signals that you would wire to the MS or O2 harness

https://i.imgur.com/uDMwEqI.png

Originally Posted by Mirage775 (Post 1502079)

I wasn't sure if I could do that or not, but it would definitely be easier!
That pic looks identical to my kit. So, for the wires in the Green circle above, I know red and black are power and ground. The rest of the wires say they're optional in the instructions? I'll post a pic of it next.

Originally Posted by Mirage775 (Post 1502079)

I wasn't sure if I could do that or not, but it would definitely be easier!

Originally Posted by HmoobDude (Post 1502085)

Read the instructions? I can't tell from the pic, it looks like there are 4 wires. As you said, red and black are power and ground. I imagine the other 2 are your output signals and I would think one is for WB (0-5V) and Narrow Band (0-1V). Refer to your instructions for which is which.

You can, refer to this page: MegaSquirtPNP by DIYAutoTune.com

Originally Posted by concealer404 (Post 1502100)

None of them, on a stock ECU car.

Originally Posted by concealer404 (Post 1502102)

Then you'll need to run the white and/or brown wires to the appropriate inputs at the Megasquirt.

Originally Posted by concealer404 (Post 1502104)

You don't have to.... but if you can avoid splicing into your harness anywhere, that's usually advisable. Is there a plug for a secondary auxiliary harness on your Megasquirt? I haven't messed with anything that outdated in a long time.

Originally Posted by concealer404 (Post 1502106)

Additional harness and options plug should have a pin diagram. Play a matching game with 2 wires. This is super simple stuff. :) That said, if this is hard, you're going to have a bad time tuning.

Originally Posted by concealer404 (Post 1502111)

You're going to need to do way more than autotune it. That's about.... 10% of the actual tuning.

I wouldn't put a Megasquirt on an unopened stock motor NB1, period, personally.

Originally Posted by Mirage775 (Post 1502113)

I was just going to install it to my car, then the new engine will be going into it during the Winter. It's definitely not too late to change my build plans. Someone said I could use ITB's on my car without a standalone? Is that true?

Originally Posted by concealer404 (Post 1502114)

Sounds like some crap sjmarcy would post.

If you're planning on making much more than stock power, or changing the motor itself (Or installing ITBs), yes, you need a standalone. No, tuning isn't as easy as hitting the "autotune button."

Originally Posted by skylinecalvin (Post 1502176)

You should go with something a local tuner supports or see if you can get somebody here to remote tune for you if you don't plan on learning pass autotune.

Originally Posted by Mirage775 (Post 1502105)

Yep, there's an "Options" plug, but you have to buy an additional harness and find what wire does what and splice them together. I thought this AFR gauge install was simple and the MS was PNP and that was it... I'm having doubts about this whole thing now...

Originally Posted by Mirage775 (Post 1502178)

I was told auto tune was fine. There aren't any local tuners that use MS, as I've been checking around. I found a fella in GA that will remote tune it, but he's not too familiar with MS. I just don't have a lot of free time to mess with it anytime soon. I miss the old days where you could modify an engine and not worry about electronics tuning, to make it run.

Originally Posted by HmoobDude (Post 1502186)

The PNP just means that it'll plug and play into your OEM harness, but you still have to do a bit of work on your end. Did you purchase your MSpnp2 brand new? If so you should've gotten the additional options port. If you followed that link I posted and read section 2, it tells you which "pins" in the options ports are for what. In this case you would wire up/splice your WB output signal to pin 21 of the options port.



Auto tune only "tunes" the fuel tables and it isn't perfect by any means (i.e: it wants to add or take away fuel in certain cells/bins like the overrun cells/bins) but is useful to get your fuel table (VE Table) to where you are targeting (AFR Table). There is still some fine tuning needed on that end, auto tune will not tune your ignition table, closed loop idle conditions, acceleration enrichment, A/C Idle control, etc. That is all on you to tune or your tuner to tune. Read more and research more (sounds like you have all Winter to do so), there's tons of information on this forum and over at msextra (Manuals for Megasquirt-2 (3.4.x) - Megasquirt EFI).

For me the hardest part about digging up old threads on this forum is filtering out the mis-information/outdated information/relevant information and trying to piece all this information together. Lots of threads do end up without much of a solution posted so that's a bit frustrating at times.

And as mentioned, there are a couple of users on here who will e-tune the MS for you. That is the route I am planning to go as I've believe I've done enough to get my car driving ok, but I need someone with more expertise to iron out the rest of the tune for me.

Originally Posted by Mirage775 (Post 1502110)

... I know it's simple and I'm overreacting about the whole thing. I actually don't plan to tinker much with the MS. .

Originally Posted by concealer404 (Post 1502203)

Let's back up a quick second here.

What are you trying to do with the car? What's the goal with the new engine? The wideband wiring is cake. The IAT wiring is cake. The actual install of the Megasquirt is cake. You'll be fine. Getting the car to run well after all this is the hard part and what you really should be worrying about. Like i said previously, there's no way i'd bother with this on a 99-00 specifically unless you were going to make actual power.

So what's the new motor? What are you doing?

Originally Posted by ryansmoneypit (Post 1502205)

going to have to change this way of thinking.

Originally Posted by concealer404 (Post 1502252)

You could run that setup on a stock ecu. I'd convert to a Bp5A ecu (way easier) and maybe re-evaluate if you want to give up the midrange torque with the Skunk2 intake manifold vs the oem VICS manifold. 40thou shave might be a little ballsy on a stock ecu, run 92-93 octane and it'll be fine. You don't need the Boundary pump with a car that will only go to stock redline.

That motor is in a weird middle ground where it's a lot of work and money to build a new motor with that stuff, but it won't do anything better. I wouldn't bother. Just put the bolt ons on your current motor and enjoy.

Originally Posted by concealer404 (Post 1502255)

You don't need to pay. Might need a certain post count, i'm not real sure. I know CR is 30 posts. Not sure what it is here, i've been here awhile. :bowrofl:

Originally Posted by concealer404 (Post 1502265)

If you have a 2000, it's an NB1. No immobilizer, and BP5A is an NB1 ecu. It requires converting to a return style vac-referenced fuel system to run correctly, but it's not a terrible job.

You can shave it 20thou on a stock ecu. You can't run ITBs on a stock ecu. You can't run MSM ecu.

Originally Posted by Mirage775 (Post 1502271)

Yes, I know my car's an NB1...

​​​​​Ohhhh, I thought a BP5A was an MSM ECU? So, what's a BP5A ECU from?

Originally Posted by ryansmoneypit (Post 1502280)

Solid advice. Bout time you joined the real miata club mirage

Originally Posted by ryansmoneypit (Post 1502280)

Solid advice. Bout time you joined the real miata club mirage