Hey all, looking at the Mild 2 Wild on the FC3SPro website. Wondering about a fuel computer. FC3SPro recommends the A'PEXi S-AFC for my 87' Turbo S4. I was wondering if there is a newer and better option other than this one. I believe that the A'PEXi S-AFC is a plug and play unit which is nice.
Also would I need a FCD and a fuel computer?
Thank you.

 

the AFC works, but its $550, and that is most of the way to a better ecu. you do also still need the FCD.

i would keep an eye open for a used haltech platinum, or power FC, or something like that.

 

The SAFC and all those piggy back units are a bit old hat now and are on ebay in varying condition, IMO I'm not a fan of that. The newer version is the A'Pexi AFC Neo. Even the next step up being the Rtek ECU is discontinued now.

In my opinion, I think standalone (Haltech or others) is the more economical solutions. For maybe ~$1200 you can have full control instead of just a fuel control for around $550. It was more expensive to do a standalone back in the day than it is now. Just my $0.02

 

With a standalone I would not need a FCD because its not the stock ecu, correct?

 

Any certain model of the platinum, or power FC that you would recommend?

 

Correct

 

I’ve been in your position. I’ve ran s4 t2 and s5 t2 with a fcd, rtek and safc neo. It worked.

you might want to look into the input signal for the safc. Iirc, it used the tps for input. I switched over to the boost pressure sensor for signal (do some research before doing this), but s4 only has a short range tps, therefore it will only give you a reading of WOT for anything above 60% throttle (estimation).


Then you add up how much you spent and how much you can sell it for. I since moved to a apexi power fc. I’ve run older haltechs before.

and now I’m looking at finding a used newer haltech.

just throwing that out there since I feel like you’re going down the same path.

 

Thanks for the advice, I think ill go with a standalone. Did you have the WOT problem after installing the stand alone?

 

No I did not have the same problem under WOT with my standalone.

apexi power fc (and most stand-alones) use a Map sensor (manifold absolute pressure) to build a fuel/ignition map of manifold pressure versus rpm.

tps is still retained but it gives the ecu info in order to help drivability.

btw, I got a drivable base tune for my power fc from banzai racing.

Ironically, I was checking out a skyline r32 today and he’s running a haltech 2500. It has the auto tune function (reaches set target Afr’s & other conditions). I’m currently interested in picking up one ecu from this haltech series if I see one for a deal.

id say you should reach out to the haltech guys if you’re interested. It was user C. Ludwig who was able to provide base maps to the rx7club haltech threads.

 

Apexi power fc is almost plug and play. You’d have to run a patch harness available from banzai racing.

But it’ll let you run the stock engine and dash harnesses.

grab a base map from them based on your fuel injector size, and you’re ready to drive.

If you want to be on a budget, a used apexi safc 2 or neo Combined with a fcd would be enough. You can still gain the fuel cut feature while still adding fuel.

If you find a apexi power fc for a deal, more power to you.

No matter what, you really should get a wideband O2 gauge/logger if you don’t have one already.

 

Like the other users suggested the power fc is plug and play. A haltech platinum sport 1000 can be found for a good used price, but you'll need to build a harness. The power fc is definitely the most budget friendly

 

you could build an adapter like the Power FC, my friend actually went so for as to make a little box with a PCB in it, and the ECU plug on one side and the harness plug on the other

 

That's a rad solution! If you got pictures I'd love to see.

 

i have an rtek in one car and a megasquirt3 pro in the other, and if you can find a megasquirt tuner in your area the microsquirt is 400 and you get new wiring harness instead of old worn out stuff, and new sensors, if you can diy everything but tuning, you can really save a ton. i tune myself and its a learning curve for sure. i had previously tuned cobb on the rx8 and rtek, but a blank page install is much harder.... and i really have no one to grade my paper so to speak.

 

i mean if you find an AFC for $80, it works fine..

really tuning is giving the engine what it wants, the hardware/software is just whatever is available. the new ecu's are nice, they do a lot of stuff in one box, but people were making big hp on these cars with all kinds of crazy setups (stock ecu, with additional injectors, AFC, GCC, FCon.... etc)

 

The Microsquirt is another viable option if you're willing to get your hands dirty.