A certified tuner would not ever tell anyone to run the stock miata ecu with a turbo kit, nor would they encourage even 1%, to go ahead with run it with an fmu. They would say STOP. Do it right or don't at all.

Well seems we have a ton of tuning experts, seemed to miss the class on spelling holley though, thanks for the tip! Also knowing people will do whatever the hell they please was reasoning to offer the stock ECU option. While NOT a good option, it's not impossible. Using standalone is ALWAYS. THE. BETTER. OPTION. But if you're a broke kid and don't mind blowing your car up go for it :)

Hm. I have a 1.8 with the FM turbo kit. I just bought a MegaSquirt, and I also got a lightweight flywheel and stage 1 clutch already on the car. I didn't buy injectors though...Do I need new injectors for a low boost tune, or will the stock injectors be good enough? I'm not planning on trying to max out the car's power with the tune, but looking more for a "casual" tune I guess. Does that matter?

(big noob here, only owned the car about a week now, trying to learn as much as I can)

Thanks

Yes. You need injectors for anything more than 4-5 psi. And stock fm2 I believe runs at 7-8 psi without a boost controller.

Most here recommend flowforce 640cc injectors. $300 but well worth it.

Hm. Okay. I'll definitely look into them then, so would the car run lean without bigger injectors or? How does that work? Just out of curiosity

X amount of air needs y amount of fuel.
As you increase x so must you increase y
If x is increased and injectors are maxed out, y won't increase, creating a lean condition, ping, detonation and boom, gouged pistons, low compression, hole in the side of the block.

Moral of the story, more air needs more fuel.

Alright yeah bigger injectors it is, thanks haha

You could technically run low enough boost to not need new injectors. But once you have megasquirt and a turbo, injectors are literally the only thing between a 150whp setup and a 230whp setup.

In this sense, how much boost could I run on stock injectors until I can get bigger ones?

edit: Borka answered this question already, nevermind haha

The other issue is how low can your wastegate actuator actually go. I maxed out my stock 94 injectors with a MS1 around 4 or 5psi if I remember correctly.

I guess I'll run 4-5 psi until I can get bigger injectors.

This assumes that your wastegate actuator actually allows you for that little boost. Most stock ones are for somewhere between 6-8psi.

So how can I find out how much my wastegate can handle?

Floor the car in 2nd gear, watch the boost gauge and see how high it goes.

But you might blow the engine doing this without proper tune and fueling

You blow up your engine. That's pretty much when you know.

If the boost spikes, assuming you even heard the detonation, you would literally not be able to remove your foot from the throttle quickly enough.

At 6000 RPM the engine is turning 100 times per second. That means there are four cylinders each being fired 50 times per second, so that's a total of 200 ignition events per second. One properly lean detonation event can break a ring and piston and destroy your engine. One.

So since the car already came turbo, how is it setup by the previous owner to run?
I'm assuming you bought it in a running state?

If you can't afford a set of injectors then you can't really afford and engine either, can you?

Sounds like you aren't ready to turbo your Miata. Not being harsh just pointing it out

Damn man I got a lottt to learn. Is there a specific thread I can post everything on my car and get feedback on what Im running and if I need to change anything? I felt like my car was running safely but now I'm a little worried, smh.

So the previous owner set up a VooDoo box Piggyback on the stock ECU. The car is actually running really, really rich right now. Idling at about 11-12, WOT is 12-12.5, and cruising is 12-13 (On average). I bought a MegaSquirt but I need to cut out the Voodoo and resplice the wires I think because the car turned over but wouldnt stay on with the Piggyback still wired into the wire harness with the MegaSquirt on.