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New member. Series 1 automatic with FC Series 4 6 port swap

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Old Apr 13, 2026 | 02:36 PM
  #1  
oinesrarx8's Avatar
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New member. Series 1 automatic with FC Series 4 6 port swap

Trying to get my post count up so I can participate in the for sale section

Ended up with a S1 auto with low compression.
Put in a new battery and starting capacitor to keep it going.

After many overheats it finally spit a rear apex seal.

I wanted to see how little money could be spent swapping in an older 13b.

Already had enough parts to put together an FC engine so I did.

It was alot cheaper and easier than expected.
Bought a second front subframe brace for $50 shipped. Welded the two together, flat to flat. Now have a spot to bolt engine too.

Got a roughly 11x13x1/2 piece of flat steel plate and basically made a thick baffle plate with an extension out the back to attach motor mounts.

Cut off the bell housing tabs off the rear plate to fit the automatic starter.

And ported the front cover to clear the counterweight. Used a short length of niccop tobing the supply oil to the omp.

Only issue was I didn't have the correct spacer to set end plat but it's auto so I let it roll. Ended up with major front main seal leak through.

Went with the JDL fc to renesis throttle adapter since I was in so little money.

Besides minor plumbing it was straightforward.

Have been daily driving her coming up on 2 years.

That is all.
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Old Apr 21, 2026 | 06:36 PM
  #2  
CarbonRX's Avatar
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Hey welcome to the forum, this is interesting combo,

can you explain your fueling and ecu setup/ or lack of one?

hope you enjoy your time no the site.
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Old Apr 29, 2026 | 05:43 PM
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oinesrarx8's Avatar
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For fuel I'm running 4 rx8 blue injectors. I just blocked off the fuel return line on the secondary fuel rail to run the stock dead head setup.

I originally just ran the oem computer fully. But i did eventually upgrade to Versatuner but the fueling was really close.

I also didn't mention that the engine setup is kinda of odd.

I'm using a euro spec lower intake manifold that uses butterfly valves for the auxiliary ports. I'm using the ssv solenoid to control the aux. valves. Since I only have the single throttle, I have the primary and secondary ports as factory unported. Then the auxiliary ports side feed into the rotor housing into a semi+pp setup.

The automatic is really holding this setup back. But I have been wanting to try this for years and it does work.

I'm not sure if I have any pics saved but I plan to tear it down so I can use the rotors for an engine more suitable for an auto.

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Old Apr 29, 2026 | 06:16 PM
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oinesrarx8's Avatar
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O
Only pic I could find is from when I was testing some smart coils.

You can see how bad the oil leak is. The abs pump and alternator are coated in oil.

And the cardboard after the throttle adapter was testing fully blocking secondary then increasing orifice size to see if I could pick up any low end torque.

Last edited by oinesrarx8; Apr 29, 2026 at 06:19 PM.
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