I've been researching some products about air/fuel regulators, and have narrowed my search to 2 brands, the Hks Super AFR, and the Field SFC Hyper R. ive found outstanding purchases for both, (involving being less than 220 dollars, and free overnight shipping!), and was wondering what the experiences of fellow Rx7 owners think about their products. my car is an '88 (? not sure as i think i have high impedance fuel injectors, but my vin# ends in 7198. so i think it is an '87, but i will look at my title later), and it has an upgraded Tid, full 3" exhaust, (from downpipe to 3" inlet mufflers), and a centerforce stage 1 clutch. ive already upgraded the fuel injectors, (secondary to 680cc), and i plan on upgrading the turbo to a t3/t4, after i get a fuel pump, and proper intercooler set up. would like to know what you guys think about your fuel regulator, or just any opinions about what you think about any of them!
Thanks,
Ryan.

options are...
1. Field SFC Hyper R
2. Apex'i S-AFC 1 or 2
3. HKS Super AFR
4. Greddy Emanage.

havent really researched the greddy, but i find it somewhat prominent on web searches, so i though i would throw that in as well...

 

safc 2 all the way, although i'm biased since i bought one. it has a knock meter and a really cool hi/lo throttle feature that i doubt any of the others have.

 

Yea everyone around here seems to use the S-AFC

 

S-AFC is the best way to go!! I had one on a 91 240sx with a JDM CA18 boosting at 18 on stock turbo. And theres one on the way for the new rotery. Wouldnt trust anything else!

 

I bought an SAFCII and honestly I wouldn't buy any type of lie machine again. Because that's all it does, it lies to the ECU it tells it something different than what actually is to get a different reaction out of the ECU. It does not take into account all the parameters. So the ECU at some point could send out a signal and really screw the engine. This is just my standpoint though. I would save up and buy an ems system. Much more worth it in my opinion. Go ahead and flame me.

- Steiner

 

*flames!*
just kidding. i agree, though can't name exactly how it would have negative effects (though dont doubt it for a second). i will run an s-afc2, but, had i had all the time in the world (or money), i'd hold out for a standalone. its arguably the best, but comes with a cost. you can get away with piggies, but there's better.

 

While an interceptor is not as sophisticated as a full EMS, the results it gives will only be as good as the tuning. The fact that it's working with less info means the tune needs to be a little more conservative, but it'll only "send out a signal and really screw the engine" if it's not tuned properly. Other than the AFM, all of the ECU's sensors are still giving the same info, so the ECU is still responding to things like coolant temp and manifold pressure as it should.

If you think they're so bad, why did you buy one?

 

I bought one originally because I didn't have the money to go stand alone. There just seems to be more room for error with it. You can't look at specific parts of the map ie what it will do under this load, instead it's only take or add this much at this rpm. I had the SAFC on my car for two days and took it off because I thought it was awful. Did not like the format at all, turns out I had a few major problems in my engine harness, mainly the wiring being old and cracking. Sold some of my stuff and bought a Haltech, sure I'm in a little debt, but I can control any fuel or ignition component at any rpm, under any load. I have many other options, there are correction maps for baro, volts, temp, etc. Granted the stock ecu has some of this, the fact that I can control what happens, makes me feel much safer. Plus I can get much more tuning capabilites.

- Steiner

 

Nobody's saying an EMS isn't superior, but your comments about the S-AFC implied the unit was practically guaranteed to grenade your engine, which is far from the truth. The real dangers are from poor tuning, which is just as much of a problem with a full EMS, probably more so considering how much more adjustability there is.

Everyone wants a nice new EMS, but for a mildly modded car a fuel controller makes better economic sense.

 

how much more conservative? what a/f ratio would you recommend? different ones throughout rpm? any info will be appreciated and considered for future use (when the engine is rebuilt; still flatlining outside my house).

 

yes, i was thinking about getting a stand-alone, but i will probly do that after i have the proper load to actually need it. afterall, i am not about to blow up my car for some spirited fun and then have it not work again. ive been having to save up money for everything that i need thus far, (have dropped over 1k already in just getting it properly maintained), because i bought the car used, and thought i needed a new engine, but i didnt, i just needed to get new primary fuel injectors. but, that was after i purchased the engine already. so, while taking it apart, i noticed a lot of things fried, or just needing to be replaced badly. so, i have new gaskets on everythings, new oil sending lines and unit, new alternator, fuel injectors, dp/mp 3" combo, aftermarket boost and a/f guage, i replaced all non fuel hoses with silicone hosing, (so it wont corrode like the rubber ones), i did the pulsation dampener replacement, i replaced the fuel lines, bought a new air flow meter, a new fuel filter and oil filter, purged the radiator....i did damn near everything to make the car run about as perfect as i can get it to stock. and even bought a hyper ground kit, (for 20 dollars on ebay!). so, after i upgrade the cooling and fuel delivery, chances are ill save the money to spend on a good ems. but, until then, i will want to get an good Air/fuel regulator. i just wanted some opinions on peoples experiences with their products. ive mainly been looking at the hks AFR and the field sfc hyper R. ive heard great things about both, and they are decently priced. thanks for all the input!

 

Sorry I never ment to sound like a piggyback will automatically explode, but it seems to me like it is just easier to mess something up with that. Yes any type of EMS has lots of parameters that you can change and adjust. But with a base map it is pretty easy to start tuning and get a hang for what you are doing. THIS IS TO A POINT. I personally would not tune my car for boost because that takes lots of experience. Under vacuum it's pretty self explanatory. Under boost though it takes someone much more experienced to know what everything they are seeing means, but you can learn yourself from watching and fidling with things.

- Steiner

 

Anyone that has any experience with the e-manage will acknowledge that it is a step up from a basic safc. It's capabilities are reflected in the price.

A safc II can be had for 325. For 450 dollars you can get the E-manage /Support Tool/ignition & injector Harness. The afm correction factor on the e-manage is 16 x 16. The afm afm correctoin factor on the safc is 12 x 2 (High/Low throttle). The e-manage does require a laptop or the e-01 for interaction. It has much more capable and indepth datalogging. It has the ability to alter ignition timing, and can even control timing/fuel via a MAP sensor once the AFM is maxed out.

I sound like a greddy advertisement, but I firmly believe that it's a great answer to many turbo fc owners that are moderatly modified, but don't have the finances and/or time to convert to a stand alone. Eventually I'd like to switch over to a lt8 or e6k, but for my power goal (285-300rwhp) I believe the e-manage is the best option for me.

I agree 100 percent. Now how about those f5's