I'm currently looking at a 1988 Turbo II, seems to be in good shape, rebuilt streetported motor with 3mm seals, etc. It has a T04 turbo and manifold but an almost stock fuel system (FD fuel pump) so it hasn't been boosted in quite some time.

The only standalone EMS i have any experiance at all with on rotaries is the Power FC with a 1994 FD. I really like the system with the FC Commander and all, and am just wondering if a Power FC is available /or can be modded to work with the S4 TII.

Thanks for your help

-Sam

 

Not available for S4's. It's not really even available for S5's, but some places fit FD ECU's into S5's because they're very similar, and can then have the PFC fitted. The S4 ECU is quite different.

 

Well, is it possible to get the FD Power FC to work with an S4? Any sites that I can look at to get info? I have searched quite a bit on both rx7club and nopistons...

 

Is the Power FC not a standalone? Why would you need the stock ecu from the FD fitted into a S5 when the Power FC replaces the ecu as a whole?

I was doing some reading and it goes something like, "AP Engineering modifies the the FD power fc to work with the FC3S... and they actually have FC3S something something for the serial number on the power fc..." and something about modifying something to fit with the FC3S manifold... but apparently these units are very hard to find especially in north america.

 

Actually, if you put in the time and effort, I'm sure it's possible.
It's just that there's no one that has done it and offer this "modded" Power FC to the general public for sale (that I know of).

By the time you get all of that taken care, I think a Haltech (or almost any other stand-alone) ECU is a better bargain for the money.


-Ted

 

This thread so belongs in the EMS section btw... Also you might want to do a search in that section with keywords "power fc fc3s" or something... I did this search a day or two ago and that's were I got the "AP Engineering" modded version info.

 

Sorry I didn't say that quite right. The PFC is a direct replacement ECU, so the plugs and wiring must be a match for the donor vehicle. The S5 ECU is similar enough to the FD ECU that the FD PFC can be plugged straight in if you do a whole bunch of wire swaps on the ECU harness. The S4 ECU is too different to the S5 and FD ECU's for this to be practical. All the plugs are different for a start.

As I understand it it's the ECU harness that needs the mods, not the PFD. I can't see whay any manifold mods would need to be made.

Ted's right, given the work required to get a PFC working on an S4, you might as well buy a Haltech. At least you know it'll work right.

 

Meh, my reasoning for wanting the power FC is that I KNOW how to tune it and can do so with a wideband +butt dyno, at least for a good idea of power and most importantly correct A:F ratio tuning, and then rent a dyno for an hour or two and tune for power, but I don't have a laptop (hence the want for a FC Commander), neither do I know how to tune a Haltech.. anyways, thanks for the help, i'll prob end up going with the Haltech or an Electromotive TEC III with coil-on-plug ignition.

 

ap eng. only has it for an s5. not dissing on the pfc for the second gen (cause i have one), but like RETed said....ud prob be better off getting a haltech instead of trying to get the pfc to work for the s4. there is more to the pfc than just a harness to make it work. ap eng. rechips it to make some differences between the fd and s5 fc work, even though i forget what some of the little things were. im sure someone could easily figure out the harnessing part to make the pfc work with a s4 but the chipping is the main thing. there are even more differences between the fd and s4 fc that would have to be worked with.

 

I'd forget about coil-on-plug ignition on a rotary. The plugs run much hotter than on a piston engines and I doubt you'll find a coil that can hack it. A mate of mine tried it using Nissan Skyline coils on his 12AT, and after replacing them all at least once, he went back to the extremely reliable stock FC ignition system.

 

AP engineering makes a PFC for the S5. It's a modified FD one and you will need to use several stock FD sensors (air intake temp and MAP or GM map sensor or 3 bar apexi). You'll either have to make adapter harnesses or buy them yourself. I made 2 of my own adapter harnesses for the sensor but bought the one for the S5 ECU connectors to the FD PFC unit (3 plug to 4 plug IIRC).

Currently I think there are only 2-3 people in US running the AP PFC on an FC successfully and I'm one of them. There is maybe 1-2 in Canada that I know of as well.

Check out the PFC forum for more info.

 

and what's about S4's?

no way? :/

 

I made a PFC work in my 87 NA converted to a TII, you need to goto the junk yard and find a MAP sensor, oil sensors, etc from an FD. cut the engine harness from an FD or find some of the female ends of the engine harness, then you will need both pinouts for the FD and FC and cut your existing harness with confidence cause you cant turn back after that or your just gonna go crazy, hardwire the corresponding pinouts together and wire all the FD sensors in place of your existing sensors, This is only breif, its very similar to wiring an S5 motor to and S4 body, but if you have a pretty good knowledge of elecrical then this can be pulled off, my suggestion is if you have time to look this deep to fiding out if PFC will work in your car then you should just get accustomed to Haltec, but if you are presistent like me than you will want to do the conversion to make it work. but Haltech will be a hellova lot easier, but I leave it up to you
Good luck!

 

So you used an AP PFC on an s4 TII engine?

Also wondering why you converted to FD oil sensors (I'm assuming level sensor because that's the only one) since the PFC reads nothing that I know of concerning oil.

 

No, I did not use the AP PFC, I used the standard 1993 FD PFC, and its not about what it reads, its about having all the FD sensors regardless of if they are displayed or not, it just a thing I have to make sure I have a little assurance that it will work on an FC but still think its an FD, basically speaking its like trying to make an FD stock ECU work on an FC, it takes alot of planning and careful thinking to pull this off, it took me almost 4 months just to gather the info nessecary to do it, then a couple more weeks to actually do the install, but nobody said it was gonna be easy

 

Ok just wanted some clarification.

 

np