PFS Purple piggyback
 

how does eveyone feel about this piggyback? It was tuned by Peter Farrel for the mods that he also did to the car at the same time.


I have heard some porr things about this system, what are somethings that other systems approve on that the PFS Purple can't do?

I have it in mine and it works great!
 

I have it my 93 and it works well

!;)

My mechanic seems to think they work really well. They do a hell of a lot more than just adjust the fuel so I think that makes them a better deal than alot of the other piggy backs out there. I'm in the process of getting one for my car, I get home in August to use it so I can post then how it works. Also if you have an Auto it definitely is the way to go.

I had one but changed it out for the Apex'i PFC. The problem with it is all the bad things of the stock ECU are retained. Uneven accelleration, poor idle, dead spots (hesitation). All that vanished when I put in the Apex'i.

PFS PMS is an excellent unit. If you are staying with the twins it's all you need.

PFS system (Newer software) works great for me and my Single turbo system for now. I am in the thinking stage of what ecu system I will jump to. But for now at 10 to 12psi it works great not trying to go higher until standalone ecu. Idles fine, runs fine, very tunable on the rpm and fuel and timing tables. Which is the basics for keeping the car running correct. I am running half 103 and half 93 octane fuel. On ill problems but the only problem at times is the 3k hik-up. But that does not happen all the time.

Manny

Hello to all,

About the topic... I'm currently using the PFS ... it was working perfect with the twins, but I just did the single turbo conversion (last week) and then the problems begin. I would like to stay with it (PFS) 'cause is very user friendly and I liked the way it was working ... but like someone told, it retains the stock ECU problems. My case... the computer is reading a fuel pressure regulator selenoid & relief valve error code and it begins to fuel cut after 3000 (like protecting itself). I restart the ECU (ground/brake) and it runs fine until the codes appear again some minutes later depending of the TPS position during the ride. I did chk all selenoids and they are working fine so I'm stcuk! right now. If the guy running single w/the PFS could help or anyone else...you R very welcome.....if not I may change to PFC or AEM.......my car is an RX7 R2 1994 US spec...

thx!

Aimec Racing I just got a pfs pmc so I haven't messed with it yet but I've done alot of reading. If you have the newest software version of the unit and the windows interacq software you can actually use the unit as a stand alone unit. If you go to the "Stang Forum" that talk about this alot using the unit on their mustangs. You can set it turn turn into a stand alone unit at certain rpm's so if you did this it would solve your error code problems and also get rid of the rpm fuel cut that the stock ecu has.

Also EFI has a stand alone unit I believe it is the EFI Extreme. So if you wanted to go that route it might work for you. I haven't heard of anyone here running it though.

Another thing it looks like you've read the other thread on the cut out problem, have you tried relocating you knock sensor to your alternater bracket?

I the PMS cannot be used with single turbo and I have never known anyone who ran it successfully as a stand alone. It is a piggy back on the factory computer, period.

It works well with the twins, sequential or non-sequential. Beyond that, you need another computer.

Wrong!!
I am using the pfs now with my single no problems other than the 3k issue sometimes. The guy talking about the fuel cut, you have a bad selenoid in there or you are missing one (period).
I too had the same problem but when all selenoid are in and error codes cleared the car will run above redline with no fuel cut.

Pm me if you still have problems.

I feel like you guys are giving up when a problem happens with the PFS and then saying it can't do it when it works.

You are the first person I have heard of who used the PMS on a single successfully. In fact PFS always went to the tecII in the earlier days and now uses the tecIII.

My fuel cut problem with the PMS was the knock sensor. PFS moved the knock sensor & I have not had a fuel cut problem in years.

All you need to run a single on the stock ecu, is not boost above 10 psi, and attach a manual boost controller, so that the ecu no longer actuates the wastegate... it's essentially the same as going non-seq...
You can always go simpler... it's not easier going more complicated...

I know this is an old post, but what would be the point of going single(besides engine beautification) if you can't turn up the boost. It seems you have the down side of nothing down low (and lag) and not too much added up top because of the same stock psi.