I am trying to get my old 1980 RX7 up and running again after it had been sitting in the barn for 12 years. The first motor died in 1992 and I put in a 12A 6 port from an imported Japan motor. Back in 1993 I couldn't get the original carb to run good and took the car to a shop who put another carb on it and wired the 5/6 ports open. Since 1993 my son and I have put 100k on this second motor, don't know how many true miles are on it. This motor has never ran as good as the original and I believe it is the 2 extra ports not being really dialed in.
The other week I pulled the carb and ordered a 80 carb kit even thought I figured it wouldn't match. Sure enough it didn't, so my cousin and I cleaned and took the carb apart but couldn't take a screw/bolt out of the bottom of the bowls and didn't want to break them off. Cleaned as best as we could and put it all back together. Drained the gas and changed the filter and with a new battery it fired right up. I had put MM oil into the motor and turned it over by hand several times during the weeks of gutting mouse stinking carpet out. It cranks up with no problem but won't idle very long. I can tap,tap,tap the gas and it will keep running. When we pulled the carb apart several of the side vacuum canisters didn't hold air or work correctly. I expect they are the real problem now.
Today I pulled the carb and the intake off to get a fresh look at the 6 port intake. I am strongly looking at putting a Holley Snipper EFI on this car. I have been reading and watching videos and may be needing some help if I go that route.
At the moment I am making a list of additional changes required for this. I know that a new fuel pump is needed and I will be needing a new radiator and will probably get one with electric fans so a new alternator will be needed.
I don't want to mix my oil in the gas tank so how do I use the motor driven oiler that pumps into the old carb?
Watching the RAD videos shows a 2 barrel EFI when I am thinking that I really will need a 4 barrel to be able to tweak the 3-6 ports.....
Anyone have experience with this motor and EFI combination? Please give me your input.

 

Is this the correct place to post this thread to get the most views? I have probably one of the only 12A 6 port motors in the USA.....and really want to try and get it running 100% before throwing in the towel and getting a 13B.

 

I don't have experience with a 6 port 12a, but do with 6 port 13b's. And experience with a sniper on a 12a. Ill start with, with the 5th/6th port actuators wired open you are giving it all the port timing. Good for high rmp but a slouch in the low rpm. Just to much air down low. Ideally you would want them working. Witch puts us to the topic of the sniper.
Im not aware of a 6 port 12a manifold with a 4150 flange (sniper/holley) . Witch would leave you with either making a adapter from your intake to the holley stuff or building a whole manifold. And yes a fi fuel pump/reg/filter lines are needed. Holley recommends 3/8 fuel line min for feed and return. Stock lines are 5/16 or gslse has a 3/8 feed and 5/16 return *might have that part backwards
Honestly i run a s2 alt so i think its like 70a running the sniper, msd direct fire, 2 e fans all my lights work and a host of after market gauges. I have yet to have a issue power related. Not saying you will be fine but its being done.
On the omp the sniper has no provisions for anything of the sorts. But one could drill and install tubes into a manifold to then hook up omp lines. I say that in a theoretical sense. But the omp is just that a pump. And reading a sticky in the 1st gen section about boost prep on a Nikki. It was found that it will pump even in a positive pressure environment. Now the location for the brass tubes inside the carb sit at the top of the boosters where vacuum is either non existent or very low. So the direct method of in the primary runners would see vacuum at idle and low throttle input. For reference my car will pull 20in at idle.
I dont see it as a issue because as its a metering pump it can't suck oil from the engine as the pump is in the way. Untested theory of course. So in that sense yes you could keep the stock oiling system.
The sniper system is still "newish" when it comes to our cars and not alot of research has been put in. We know quite a bit and the system is pretty limited in our application. With pretty much zero hope holley will step in and accommodate us. And what we need would be some pretty easy software code. To take control and advantage of the whole system.

 

But with that said I am profoming some r&d in the subject of unlocking use of the ingintion control aspect that "your" 1400 dollar system can't use.

 

Thanks for the input. I have pulled the OMP and going with the gas mix in the tank... also already changed the alternator to an S2. I haven't changed the radiator yet, but am smelling antifreeze but don't see any liquid. I plan on pulling the front cover off and looking at the front side of the radiator today. I did not go with the Sniper, but went with the ACE's 2 barrel "Duces" EFI. I CADed up an adapter for the EFI to the 6port intake and made a sample on the 3D printer. It looks good and so I have a son who was able to get it made for me out of aluminum and it bolted up and looks good. Time will tell... With it running and me smelling antifreeze I am hoping that the intake is not leaking antifreeze into the ports. I think that I have it sealed good, nothing leaking on the outside!
For programing I used 4 cylinder motor to get the RPM to match up and 120 cubic inches vs the 70 cubic Inch which it really is. I have had it cranking and running but it doesn't want to stay running just yet. I was finally able to get it to idle and it did for 15-20 minutes to let the temp get up high enough to maybe start to learn. I took pictures of all of the screens and am now trying to learn what all of them mean. I am hoping that the EFI will be able to learn and work around the 6 ports being wired open all of the time.
If anyone out there has any knowledge on the Duces and our motors please send me some aid! Thanks in advance.