I was reading in the FAQ that the stock injectors run rich, can i lean out the mixture and if so how/where? What kind of power gain should i expect? This is in regards to a s4 N/A.

 

SAFC-II or better yet Megasquirt.

 

safc on NA? ghey. what a waste. Read the FSM, there is a variable resistor that controls that. DONT MESS WITH IT. but if you are that worried, then try that, also a stuck injector will cause super-rich runnings. Have them cleaned, and good luck.

 

And why is that? Lots of people run them on NA's. It has been dyno proven that you can gain noticable HP by leaning out the top end, not to mention the better gas milage.
For the OP, to see those gains, you it needs to be proffesionally tuned, but you can do it somewhat yourself with a wideband and an a/f gauge n adition to the safc.

 

Nothing about this post is correct. Please do not post misinformation.

The variable resistor you speak of controls ONLY THE IDLE MIXTURE. It does not effect any of the load maps in the ECU.

Stuck injectors are VERY rare and it's highly unlikely that the car will start if you have one. If it does start, it will be completely undrivable.

An S-AFC is a good investment for all FC owners on the stock ECU since the mixture can be leaned out quite a bit under load and especially cruise to increase power and save a good amount of fuel (with today's gas prices the S-AFC and tuning might pay for itself in less then a year if you drive a lot).

 

Any suggestions? I'm in the market for one myself. (Also have S4 N/A)

 

Suggestions on what?

 

Thanks Aaron for getting this post back on track with correct facts.

A Megasquirt gets my vote. Of course you will need to buy the kit and build it yourself
( not that difficult really but does take a lot of time and patience )

The other Megasquirt option is to by this one;
https://www.rx7club.com/showthread.p...95#post5574295
and plug it in and start tuning.

I ran one on my NA and it make a differance for sure.

Good Luck

 

I am planning to eventually turbo my car, and when i do will i still be able to use the same SAFC/Megasquirt (with adjustments of course due to the turbo)?

 

Sure, you'd just have to reset your a/f ratios.

 

Now which of the 2 ECU's (SAFC or MegaSquirt) is more user friendly and or easy to install and setup? And what are some pros and cons of each?

 

I know there's a program out there that can link the megasquirt to a computer so you have a GUI interface and can even load maps on the go (if you have a laptop hooked up or a carputer). I think they also sell link dials and monitors, etc for the Megasquirt, but you'd have to do some digging on that one.

There's alot to the SAFC and the Megasquirt. Depending on accuracy and how much tolerence you want from them is how you could best decide. I saw an SAFC II (apexi)... or it could have just been a regular SAFC selling for around 129 or so while the next model up was somewhere in the 400's. The difference between the two was a 5 or 9 point rpm A/F map with a 20% tollerence and a grey scale monitor, while the SAFC Neo I think had around 15 or 16 points you could set plus a color monitor with an overall Tollerence of 15%-20% (exact figures leave me at the moment). Pretty much if you want all the bells and whistles you'll pay for 'em unless you get lucky.

The Megasquirt... well you already have the links.

I think my course of action will mimic yours a little bit. I'm thinking about putting in a carputer somepoint in the near future and have it piggy back the ECU with different fuel maps and what not. And I believe a Megasquirt allows you to do that... but maybe I just read that wrong (it's a little late here)--can anyone validate that for me?

Well that's all the research I've been able to do on it so far, do some of your own and post back your results.

 

This actually really interests me too, I use my vert for mostly commute, and I'd love to lean out the gascard bill.

 

I always see people recommending the Megasquirt these days, and it worries me.

The Megasquirt is a FULL STANDALONE ECU. The S-AFC is just a piggy back that modifies the stock ECU.

Because the Megasquirt is a big DIY effort, installing one on the car requires the knowledge to wire it up, configure it and then finally tune it.

If you use the V 2.2 Megasquirt, it WILL take electronics knowledge if you intend to control the stock ignition and use the stock sensors.

The V3 board requires less of this knowledge but you still do have to modify the circuit.

Once either version of the Megasquirt is running the car they are a joy to tune but that initial setup can be a major pain in the butt. I don't recommend it to anyone who is just starting with a standalone.

 

What Aaron says is true. The Megasquirt is an involved project. I have the V3 and am using the built in circuit and a modified CAS (cut out two opposing teeth on the 24 tooth wheel) I connected it to my stock wiring harness using an adapter which I assembled myself. As I said in my earlier post it did take about three months from the time I had all the pieces until the time I got the car drivable. No keep in mind I worked on it evenings and weekends NOT full time for three months. I personally think it is a good choice because it will force you to learn about your car. I had never done any soldering on PC boards before assembling mine but I got the hang of it after some practice. I chose to build my own instead of buying a prebuilt one because that is how I learn. I you DO decide to go this route AND decide to get a prebuilt unit be sure to get one that is prebuilt specifically for the rotary otherwise you will be unsoldering a few components to make mods to the board for it, NOT much fun for those inexperianced with a soldering iron.
Just my $.02

 

Aaron Cake rules and if you dont like what he says than you are a retarded ***** who does not need to fool with rotarys or any mods on any car.. Stuck fuel inj? Oh my god! SAFC-2 is GAy? How can you say that, how is leaning out a rotary on n/a or turbo stupid? Man i have been away for 3 mos and i come back only to see that the amount of misinformation is astounding. Aaron, do we need a weed and seed on this forum or what?

And btw i was going to use a megasquirt on my t2. But instead i got a safc-2 and a wideband and man am i glad i did. Not to mention, i saved about 1,000 dollars.

 

ive done 2 megasquirt installs in the last few months. its hard not to recomend with the price and fairly easy if time consuming setup.
doing a bit of bargin shopping can make a huge impact. for my friends 240sx we were able to turbo and megasquirt for just under $1500. not bad for a ~110whp gain. (no baseline but we did turn 241whp)

 

At this point i am leaning toward an S-AFC, cause is sounds like it will be significantly cheaper, and at this point i don't want to go full standalone anyways, and im not exceedinly experienced in electronincs.

 

Has anyone used the new AFC Neo by Apexi? It looks awesome, I really want one. I searched and found nothing on it, guess it's to new.

With an AFC like SAFCII or Neo, do you just set it and forget it? If you don't modify the car you shouldn't have to mess with the AFC after you tune it right?

 

I definately recommend the safc. It is easy to install and tune and requires very little advanced knowledge, other than know how to change the tune. Even without detailed tuning knowledge, you can lean it out some with a good a/f meter and know what afr's to shoot for. You would need a wideband and a good tuner to get the full advantage from it, but it would still help without those.
The megasquirt should only be attempted if you're car is NOT daily driven and you have another car to use. As already stated here, it is a pretty involved process and requires at least some electrical knowledge. I plan on putting it on my car once the rebuild is broken in, but my major is in electronics and I am doing it as a fun way to put my skills to use, not to mention helping out my car.
As for the neo, I've never use it, but I would stick with the safc due to all of the user support you can get from it here.

 

Remember, you have significant experience with standalones, Megasquirts and RX-7s. For the new user, it's a different story. If they can follow instructions and have some basic electronics knowledge, they can probably do it. But if something goes wrong, then it's a different story.

 

how much better is the SAFC-II as opposed the just the SAFC?
Does anyone know where (or if) a good place would be to pick one of these up in the Winnipeg, MB area?

 

Its the same thing. People are don't write it all out because it unneccesary as most people know what they are talking about. Technically, I think the SAFC was the predecessor to the SAFC-II, but if you here either of those said on here, they are talking about the SAFC-II.
As for getting one, check the f/s section of the forums or e-bay. You can also get them new from the apexi website. I think I saw one for sale in the f/s section recently. Not sure if its still available, though.

 

safc-2 is just easier to function and has a tad more options, but not much diff than the safc-1. Other than looks and display.

 

I've got a MegaSquirt on both my daily drivers, that I have driven for years. Why wouldnt you want it on a daily driven car?

You can cut the 'invovled process' out by buying a prebiult plug-and-play unit.