Need some help/straight answers with 5th and 6th ports.
 

Ok, I've just removed my airpump and blocked off the hose behind it going to the ACV.

This resulted in a small back fire when reving up and letting off the gas and a little rougher idle, nothing bad enough to make it die though.


I didn't notice a difference in power even though the ports aren't opening, I would guess they may have not been working before anyway.



Anyway, my question is, should I just go spend more money and get a belt for the pump and put everything back. Or should I get an ACV block off plate (to cure the backfire issue) and keep on removing emissions stuff along with wiring the ports? I plan on eventually putting a 2.5''- 3'' exhaust on it without converters.

Also, very important, which direction is open for the ports? Should the rod on the actuator be pushed out or in?

Thanks for any help.

i would try wiring the ports open and see if that helps the power.

as far as removing the smog pump and emissions i don't see a point or any significant gains to doing so on a n/a, it just causes more work in trying to patch everything to work without them.

Yea, I found that out the hard way. Someone just moved up here from KY and had about 8 RX7s and was going to help me get all the emissions off it and hop it up.

He told me to get the pump out of there and he would bend up an exhaust system for it soon.


So that leaves me with the question of the day, Which way is open? Should the little crank handel on the ports be turned clock wise or counter clock wise?


I just read my FSM and it said that if the actuators are retracted the ports are open. So I guess my actuators automaticly wired my ports. Heh...

depends if u have an S4 or S5 engine...

It says it's an S5 right in my signature, didn't see it?

I Think that S4's are the ones that have 5th and 6th ports. the s5's have something called a VDI Actuator, and its a bit different than the system on 85-88 model rx7.

correction...S4's & S5's have auxiliary ports...the S4 ports are opened via back pressure from the cats...S5's ports are opened via a soleniod valve activated by the air-pump...to tell the difference between S4 & S5 ports is...when S4 ports are closed the linkage rods are fully retracted & S5's are the opposite...

Ok so I should rotate the handel up?(To open them.) What do you recomend for holding it there?

The back fire issue IS because the air pump is no longer feeding the ACV.

The whole point of existance for the ACV is to help limit backfires... by removing the air pump feed to it, you effectivly castrated the ACV; preventing it from doing its job.

Well the converter is saying goodbye in the next couple weeks anyway. I'm just doing everything possible to the outside of the motor to make more power. (And stay NA)


I was just slightly concerned at the backfiring, but I don't guess it hurts anything?

only thing it hurts is your ears and any chance of ever using the cat again because it is like a sledgehammer on the inside of the exhaust beating through the cat.

Heh, I'll remember that when putting my exhaust together.

2.25'' all the way back as a single straight pipe to a rice can would the the ideal system for my car right? (It has an RB header with a 2.5 collector.)


I'll cut the converter in half the sandwitch it back onto the exhaust to make sure I don't get my car impounded.

Plz no rice cans. My S4 has straight pipe to Y then just 2 factory mufflers, I dont like the sound IMO but thats how i got the car.

And thats gotta be the most genious idea w/ your cat. Made me laugh hahaha.

S5 owners... removing the airpump and ACV renders both the 6 port actuators and VDI useless.