I have a 1st gen, but its a GSL-SE (with a 13b 6 port engine).

The 1st gen dudes dont all know much about them, as they are normally 4 port carbies.

I'm not sure if mine are working right, because my engine seems to flatline at around 5.5k to 6k.

I have a full racing beat dual long primary exhaust and a cone intake, and my car is quick. Seems that it should be quicker. It pulls reallynice, and just stops pulling at the higher rpms.

I kinda thought thats what hte 6th ports were for, is the higher ups!

Any advice to check if they are still working right, and if not how to fix them?

Thanks

Geoff

 

5th/6th ports need exhaust back pressure to activate them on the 84-88 13B engines. If you have a full dual exhaust I doubt that they are even hooked up.

You might be able to hook them up to the air pump as the S5 motors do, or in worst case wire them open and just loose low end torque.

 

Wouldn't the power loss start closer to 4k rpms if it was the 5th and 6th ports?

Also I know Icemark is right about the backpressure needed to open them, BUT in cases like my car they work without the backpressure from a cat. I have a downpipe and N1 exhaust and my ports have worked fine like this for 2 years. It's kinda hit and miss when removing the cats.

Have you eliminated all the other possible causes? Fuel filter, secondary injectors, ect...

 

http://www.aaroncake.net/RX-7/6porttest.htm

 

well Aarons test is should work to test,

,
but either way, is there any hook up for the exhaust input for the actuators on the true duals??

 

Icemark, you may try searching for an electrical eans to open them up. It isn't that hard, and I have heard of people doing it.

[OFF-TOPIC]
Before anyone gets their panties in a bunch, if you actuators aren't powered by the air pump in the S4's, then what is the big tube coming off the back of the air pump. Does that go to the main cat? i amvery interested in this since my air pump will be coming off in about a month.

I am tempted to agree however since I only have the one tube.
[/OFF-TOPIC]

 

The big tube goes to the ACV, which then feeds into the exhaust as needed.

And yes I am aware of the attempts of electronic driect actuation, but I don't think anyone has developed a system that has lasted more than a couple months without having to resort to a air pump set up of some sort (be it an aftermarket or OEM electric airpump).

 

The power loss would start then, but you most likely won't realize it until 5k. Nice to see an FB with a 6 port instead of just a turbo 13B. By the way...damn nice looking FB at that!

 

That's the FIRST car that I've seen where those wheels actually look good...much props.

 

heheh thanks man! i love my car more than anything in this world (except for girls and sex, but even they can wait till after i'm done working on my car, or how about while?)

I know for a fact the 6th ports are backpressure actuated, there is a special tube coming off one of the presilencers.

I'll check that web page and see what i can gather from there.