10-05-2007, 01:41 PM
Join Date: May 2007
Total Cats: 12
Thanks again to everyone for the support and questions. Iíll be writing up a detailed s-afc install this weekend. Iíve 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 havenít had time to tune the S-AFC WOT (high throttle) settings, so Iíll have more to report soon. Shouldnít be too tough, Iíve played with AFCs and DSMs for 10 years.
Braineack: I do intend to get a wideband, just havenít 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. Iíll either do that, or just move to an upgraded rail in the future. Iím going to try the stock single feed out and read my spark plugs to see make sure one cylinder isnít running leaner than the rest.
rotaryjunky: Thanks! Iíve used Aeromotive FPRs on the last couple DSMs Iíve 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 itís on lightning motorsportís site also.
magnamx-5: Regarding the MAP sensor, I started with an old Denso unit that I had, but I didnít 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 itís running smaller injectors.
jwarriner: Thanks! I plan to get the car dynoíd with this configuration in a couple weeks. Youíre 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 ďNOĒ to the S-AFC, it was mainly due to cost of the S-AFC 2 or 3, which wouldnít 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. Theyíve 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: Iíll 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.