bludskorge

the apexi afc2 or the hks super afr. they are both basically the same price. and i know the hks has more functions then the afc but has anyone used these for larger injecters? single setup? stock setup with 13psi? mp dp ic no air pump pulleys msd catback? any problems with either setup ?

bludskorge

using a 255 fuel pump and an aftermarket fuel pressure regulater. and an intake with a greddy elbow and hard pipes. last thing for you automatic guys how much of a better 1/4 run do you get with the hold function as aposed to none at all?

RETed

I thought the S-AFC has more functions?
What functions does the HKS Super AFR have?


-Ted

bludskorge

I BELIEVE DONT QUOTE ME. IT HAS A IDLE STABALIZER AND IF YOU USE A BOV TO THE ATMOSPHER IT HAS SOME OTHER FUNCTION WHICH PREVENTS THE CAR FROM STALLING. Super AFR is the Idle Correction function, where Idle fuel mixture can be adjusted from 50% rich to 50% lean of the factory baseline setting in 1% increments within the idle range of 650-1500 RPMair/fuel ratios as modification progress and require further specific levels of tuning to compensate for the characteristics of high lift cams and/or larger injectors. Additionally, an Electronic Idle Stabilizer function (EIDS) function, which buffers the dramatic airflow meter signal fluctuations, prevents the engine stalling or stumbling effect associated with the sudden imbalances in the air/fuel ratio of airflow meter-equipped vehicles that utilize discharge blow-off valves that vent to the atmosphere.
this was cut and paste from another site. i understand what its saying but am curious if anyone has used both the afr and afc2 and pros and cons with both

RETed

That functions really doesn't apply to FC's unless you use a BOV that leaks.
If the TPS is adjusted correctly, you'd hit decel fuel-cut on throttle lift, so it's not supposed to do anything anyways.
On FD3S, since it's already MAP sensor based, it doesn't really help.

It's an interesting function, but it you really don't need it on an RX-7.

I still think the S-AFC has more features packed into it, especially the multi displays through it's flourescent display.

You really should check out the S-AFC.
If the prices are similar, I'd take an A'PEXi S-AFC anyday.


-Ted

bludskorge

cool thanks for the info was just wondering for my fd

rynberg

Don't use either one on an FD.

bludskorge

which do u think is the best for a piggy back power fc is way to much and i want just alittle more fuel for the intake msd and i want to open my exhaust for the sound and performance

rynberg

Then get a Pettit ecu, that can properly handle increased boost. They are typically $400 or so used on the forum. Add-on piggybacks don't work for **** on FDs.

bond007

When setup incorrectly or asked to do too much, I would agree.

I recall several folks on the big RX-7 list years ago that had mild mods and wanted to bump up boost a point or two and only needed a "little" more fuel that had good success with the HKS unit (IIRC, used both the fuel and the boost controller in concert).

They don't chime in at all because everyone screams "hack" and "it doesn't work". They just keep driving their cars.

Folks are running whole cars off a $200 fuel computer (the MegaSquirt) just fine. I helped convert a 12a from carburetion to a "megahack" GM TBI fuel injection run by the MS and it drove much better than the carburetor and pushed more power, even with it being a 2 barrel and nothing really optimized at all in terms of intake tract.

However, these are knowledgeable car aficionados and not the average "bolt-on patrs and get mega horsepower with little work or knowledge" types.

Not meaning to step on toes, but the FD ECU isn't THAT much more complicated than the FC.

More smog stuff? Yes. More stuff for the turbos? Yes. Basic fuel injection? About the same as the T-II's ECU (look at the "checklist" for car doesn't start...there are only a few things you need for the car to run).

The Pettit maybe the cheaper, quicker, and easier, but a well tuned piggyback would work just fine.