I picked up a 2nd Cosmo really cheap ( $700) just for the motor and some spare body parts. but the car is in good shape and its a shame to gut it. Can you run a powerfc for FD on it? Has anyone tired to do it. I guess I could put a E6K or E6X on easy. but would be really nice to be able to plugin a powerfc.


my other cosmo is a 20b

 

You will need to find the Cosmo ECU pinout and see how close they are to the FD. The connectors are the same and I know that even on the 20B engine harness, Mazda kept many of the same wire positions. It could most likely be done, but you may need to swap some wires around. Start by comparing the two different pinouts, then verify that the sensors function the same way and at the same resistance/voltage.

 

I'd like to know the same thing!

 

$700 for a 13B-RE Cosmo??? Dude, I'd snag that from you in a heartbeat for my daily driver if it could be legally driven here...

Banzai is correct, you simply need to compare the pinouts and input/output voltages/conditions. Pretty sure that Mazda wouldn't stray too far from a known working system (Cosmo's twin turbo control system) to make the FD. Most likely, the wiring will be the same aside from a few S5T2-esque tweaks.

If you need the shop manual, PM me with your email and I'll send it to you ASAP. All I'd ask in return is to borrow your nihongo skills to translate the pinouts, something you'd have to do anyway.

If you get stuck on something not making sense, lemme know and I'll check it out in the parts catalog. One thing I do know is that the 20B's MAP sensor has the exact same scale a S5T2 one. Pretty sure the 13B-RE uses the same NF01 sensor

 

I have the pinout right here, in the Fuel & Emissions control section of the Cosmo service manual. I can email it if anyone is interesting. It is in Japanese mixed with accepted English-language car acronyms like "A/C" and "P/S". The pinout mixes the 20B and 13B stuff together, putting 20B-specific items in parentheses.

I can tell you right now that it's not going to work right if you just plug it in. It's going to need significant re-pinning and you would probably want to have passable Japanese translation skills to pull that off. A significant number of wires do match up because of course Mazda is not going to re-invent the wheel. The thing you have to remember though is that the Cosmo

1) has an automatic transmission only
2) has a traction system control unit
3) has an airflow meter

So here is an example.



You can see that Pin 1N is the power steering switch and Pin 1O is the MAP sensor. Here are some of the same pins on the Cosmo:



Pin 1N on the Cosmo appears to be the power steering switch input, like on the Series 6 FD. However Pin 1O probably comes from the A/C switch in the cabin instead of being a MAP sensor signal like on the FD. There are lots of other examples in the pinouts of this kind of thing. The FD Power FC was designed for a manual transmission but the Cosmo never came with one so you have some things like matching up and other things being off, like the an AT input on the Cosmo harness where the PFC is expecting a clutch switch.

I bet you could make it work if you spent enough time on it but I doubt English diagrams exist and I would not attempt this without being able to read Japanese.

 

Arghx, you're definitely right about the Cosmo being a step between the S5 and FD. For all intents & purposes, it is like an FD with some S5 parts mixed in, such as the AFM. Depending on how the transmission is wired up, there may be a very simple solution. Remember, the 13B Cosmo has a R4A-EL automatic transmission, just like the FD does, and Banzai Racing makes a piggyback adapter for the Power FC to prevent the AT from going into limp mode by retaining the stock N3A2 AT ECU for the Transmission-specific functions it has. The individual kickdown, neutral safety and so on may be different, but as you said, Mazda is not going to re-invent the wheel for vanity purposes.

With the proper pinouts, one could adapt the Banzai Racing piggyback adapter to the Cosmo and properly use the Power FC just like it would work on a FD with an automatic transmission. Of course, you'd need to make a couple provisions for the AFM, but those are included with Banzai's adapter harnesses for the S4 and S5.

All in all, 87GTR would probably be best contacting Banzai Racing about this specific issue. If anyone could figure it out, it'd be Chris.

 

I thought about the Automatic PFC adapter. What's holding the whole thing back is the lack of English language diagrams. I wouldn't 100% trust guesswork of comparing the Japanese Cosmo diagrams to the USDM series 6 FD.

You are forgetting about the traction control system though. There are multiple pins on the harness associated with this that may be important. I'm sure the A/T ECU is mixed in with the traction control system in some way. Just looking at the Cosmo, it has to be a very primitive traction control system that only pulls timing or cuts fuel. If you look at other early 90s traction control systems like on Nissan and Toyota applications, they have an additional throttle plate built into the TB that is controlled by the traction control ECU. The Cosmo doesn't have that.

Again, with enough time spent and a good translation of the diagrams it wouldn't be a big deal to work something out.

 

i have a fd with a 13b-re "core" w/ fd front plate, fd rear plate, fd oil pan, all fd lim/uim, wiring harness, ect. controlled by my power FC.

things that still need to be done to the RE core to make it REW standards, is replace the stationary gears and bearings to FD ones (fd ones are hardened and have 9 oil holes, vs non hardened 3 hole re gears); also, get rid of the POS re exhaust sleeves and replace with REW ones and port the crap out of the exhaust to match how massive the RE stock intake ports are.

 

Food for thought: did you know that the 13B-RE and 20B exhaust sleeves were designed for spool and low end torque? This is from Mazda's paper on the 20B:



So yes they are restrictive, but they were designed that way for a legitimate reason.

 

Any sucess with this? Im in the same boat. Engine harness i have is so clean i would love to reuse it if possible