what does drifting have to do with anything?

It's the new buzzword.

We tend to break parts often.. lol. The abuse we tend to put motors thru reminds me of drag racing, so the better I can tune the car, the less like I am to blow it up.

That and the miata make sh*t for power so kinda hard to hold a slide without power, so the more I can make the easier it will be.

BTW I don't care what anyone says, I enjoy drifting and I also enjoy road racing. I just can't afford to road race yet..

a basic MS could be built for $220.

thats $187 for the kit, plus supplies, plus wire for the harness.

And that gives you full control of fuel and spark. add $20 and you can remove the afm/maf all-together.



fwiw, drifting still has hardly anything to do with the equation.

Wow, I didn't expect so many replies to this post! Thanks for the comments everyone. I would've responded sooner, but I've been traveling for work the last couple days.

I'll post later replying to everyone's comments/questions.

I really don't want this to turn into Megasquirt vs. AFC. I had an AFC in a box (That I paid $100 for 2 years ago) and wanted to give it a shot. So far it is working very well, and I'll ellaborate later.

-Tom

I wasn't trying for it to either, just happened out that way.

Thanks again to everyone for the support and questions. I’ll be writing up a detailed s-afc install this weekend. I’ve got wiring instructions/diagrams, map sensor info and the S-AFC manual, so it should be everything you need if you have a cheapie AFC on hand. My initial impressions are that under normal conditions, the car drives exactly like it did with stock injectors. Idles just fine and is very responsive. . I haven’t had time to tune the S-AFC WOT (high throttle) settings, so I’ll have more to report soon. Shouldn’t be too tough, I’ve played with AFCs and DSMs for 10 years.

Braineack: I do intend to get a wideband, just haven’t had a chance yet. I installed the narrowband A/F gauge because it was laying around and to use as a tool to tune my cruise/part throttle with the AFC. A wideband would be the preferred method.

levnubhin: Thanks! I have considered the dual feed rail. I’ll either do that, or just move to an upgraded rail in the future. I’m going to try the stock single feed out and read my spark plugs to see make sure one cylinder isn’t running leaner than the rest.

rotaryjunky: Thanks! I’ve used Aeromotive FPRs on the last couple DSMs I’ve owned with good success, so I decided to give this a try. There are definitely other good FPRs out there.

Spike: Looks like Braineack got you the answer you needed. It is a 190 HP and it’s on lightning motorsport’s site also.

magnamx-5: Regarding the MAP sensor, I started with an old Denso unit that I had, but I didn’t like the way it behaved. I switched to a GM 3 bar MAP and am very happy with it.

Harv: The stock computer could not idle 430cc injectors by itself. The AFC tricks the computer into thinking it’s running smaller injectors.

jwarriner: Thanks! I plan to get the car dyno’d with this configuration in a couple weeks. You’re right, the S-AFC is a pretty simple device. Intercept the AFM signal, modify it, send it into the ECU, ECU is happy. When I started doing research and saw folks saying “NO” to the S-AFC, it was mainly due to cost of the S-AFC 2 or 3, which wouldn’t make much sense. However, these blue screen AFCs are a dime a dozen, and may work out to be a simple and inexpensive way to control fuel in a Miata. They’ve been doing this in DSMs and many other cars for years.

Reddroptop: Thank you. I am running my idle setting around -45 to -50%. This is the same thing I did with my DSMs when running 550 or 650cc injectors.

wildfire0310: I’ll post detailed install instructions this weekend. Stay tuned!

mike_671: Thanks sir. The pump was 80ish shipped. That sony head unit is great for the price. I got it for the auxillary input on the front, but ended up really liking it.

All,

I posted the S-AFC install guide Here and here

Hope it helps,

-Tom

Wow, thank you. I won't likely go that route, but what a great resource. Definitely going into my archives.

And I am very curious to see your AFR logs.

Good post, looking good man!