Here it goes, the previous owner of my 85’ GSL-SE removed the air pump from the car so I removed the 5th and 6th port actuators. The car suffered with an idle issue as well on cold starts. As a result I pulled the intake apart to clean injectors(pictured) and cleaned intake as well. Then I removed the actuators and plugged the holes by tapping out threads and threading in a plug. While I was at it I removed the fuel pulsation regulator and replaced it with a banjo bolt as they are prone to leak gas onto the hot intake under it. Resealed OMP banjo bolts and replaced upper intake gasket. Below are some pictures of the project. Live, laugh, and rotar on rotary heads!

 

The actuators operate off of the exhaust. Not the air pump. That was a s5 , I think 89+ thing.

 

Oh yes, that sounds about right, my bad!

 

By removing the 5th and 6th ports, you are actually worsening the car's performance. I would clean them and reinstall them. Ensure the backpressure tube is in place on the converter and once the system is working properly, you will see a big difference in performance.

The GSL-SE has a dynamic effect intake. Pressure is stored in the dynamic chamber and at a certain rpm, butterflies in the dynamic chamber open and allow the stored air pressure to be forced into the the lower intake manifold and into the engine. Mazda called it a supercharging effect. In essence it was a way for the engine to continue to pull hard at higher rpm and not taper off. It works really well and the GSL-SE is a quick car.

 

The car does have a racing beat exhaust and headers. From my understanding having a racing beat intake I don’t really get back pressure because they’re headers that have individual pipes. Could be wrong… I am new to modifying rotarys.

 

Racing Beat makes an exhaust specifically for the GSL-SE. It includes the pressure tube for the 5th and 6th ports on the presilencer. If the exhaust that is currently on your car does not have this, then it is technically wrong for the car. It may fit fine but if it does not have the correct presilencer, then you will want to install the correct parts if you want to have the auxiliary port valves operational.

 

The 6-port system in the GSL-SE sucks. Sorry .. bad joke.

I'm converting the 12A in my '83 GSL to a 13B 6-port from a GSL-SE. Think of it as Mazda's version of VTEC. It's definitely something you want to keep and work towards it functioning properly.

 

After removing my actuators I have seen a good increase in power at around 5-6k rmp and the car seems to run smoother and healthier...

 

I doubt it, but you do you.

The GSL-SE was the flagship swan song for the exit of the 1st Generation, and much of what was learned through the Dynamic Effect Intake was leveraged for later generations. The port timing is specific to rotary sleeve valves working correctly, and blocking them off or removing the sleeves has always resulted in power loss throughout the band.

Plenty of reasons to keep what's there, but replacing the Pulsation Dampner with a banjo bolt will result in fuel injector problems down the road. These don't leak and cause engine fires like the 2nd Gen cars, in fact, they're matched at the rear by the Fuel Pump, and removing one will cause fuel pulses at the injectors which you can feel from the drivers seat.

Since you're new to modifying rotary cars, these can be your learning through experience, but it's all been hashed out here over the past 20+ years. Enjoy modding!

 

I Only took the sleeves out. I didnt block them off, the 5th and 6th ports are still open..