Suparslinc

I drive a '90 N/A RX-7. I recently had the upper and lower intake off to fix a stuck port valve, and I also replaced the cats with a bonez race pipe.
After I got it all back together, the idle was a little rough. I may have a vacuum leak, either at the manifold or a loose line, but that doesn't begin to explain this problem I'm having.
The auxilary ports are designed to open at about 3800 rpms, correct? Mine do not open until 5500 rpms. I haven't really ruled out anything yet; but I think the actuators are working as they should and I know the mechanism isn't stuck because I cleaned and greased it all. The only thing I can think of is since the airpump isn't connected to the cats but just hangs out there, maybe I'm not getting enought total backpressure in the system to open them.
Please don't tell me that the '89-'91's don't need backpressure to open, I know that but maybe all the pressure that should be going to operating the actuators is just blowing out the airpump. Any ideas? I think the next thing I'm going to do is reinstall my cats to see if that helps.

Skippydog

I also just removed my cats. I was wondering the same thing if the ports would still open at the correct rpm or if i need to set them up differnt. I have a strait pipe to the y split and the air pump line just hanging there. Do i need to plug it or connect it to the pipe or just leave it there and will it effect my ports also. Thanks for any help.

Suparslinc

What year do you have? If its an '89-'91 then it shouldn't matter, but thats the whole point of my post. Once you get the cats off and have a few trial runs, post here or PM me and let us know if you see the power hitting any later.
Joe

Skippydog

Its a 88vert.

Thaniel

Any chance you have the air lines that should go to the VDI goint to your Ports. VDI opens about 5000RPM. Check when your solenoid is opening. If it doesn't open until 5500RPM then....

P.S. Where does the Airpressure from the airpump get routed to the Electricly controled solenoid valves (on the driverside). I have and '86 and it is the crappy back pressure thing.

rx7_turbo2

HAILERS

Suparslinc.....I own a 86/87 so its different I know but your post has me curious. Just how do you KNOW that your ports are opening at 5500? Just curious. The 87 I have has the full Mazdatrix from head to toe which means I do not use back pressure to open them. I punched a 3/16 hole in the 1" hose b/t the air pump and acv and ran a vac hose directly from there to the pipe that feeds my actuators. This is similar to your car except you have a solenoid valve in line to the actuator feed pipe. I took the plug off the RELIEF SOLENOID VALVE which means the acv on my car is wide open all the time. Around 3500 rpm there is enough pressure in that airpump line to activate the ports and they are fully open by 5000. My split air is wide open also. I'm trying to say the airpump should make enough pressure with the split air and the relief valve open. I know this because I put a spare intake with actuators in the front seat with a vac hose teed into the line that was feeding the actuators on the engine. I have another method where I feed the pressure from the hose b/t the airpump and acv to a spare solenoid and then to the pipe that feeds the actuators. The solenoid is tripped by the same signal that turns the RELIEF SOLENOID VALVE on at 3500 rpm. Yeah there is enough pressure there with everything wide open.

Suparslinc

I might have to take a closer look at it then.
I know they open at 5500 rpm because I can feel it everytime. There is a definate hit there and a change in the exhaust note. It comes on sudden not gradually, I thought I heard once that the '89 + don't gradually open but open all at once? I dunno, that doesn't make sense to me. I think somewhere something is not right, because they open at 5500 and they open all the way immediately, no "pouring on the power".

HAILERS

Like I say, I have a 86/87 and they come on gradually because the back pressure builds up slowly, whereas you have a solenoid that just flips open from a source that already has enough pressure so yours probably do open in a heart beat. I think I'd take a look at the vac(pressure)hose to the solenoid that feeds the actuators with the engine reved up. See if the feed to the solenoid has any pressure then see if the solenoid itself is actuating. Might take the the hose off the solenoid that goes to the actuators and either blow real hard into it and see if the actuators move or use and air hose held a few inches away from the hose and see if they actuate. Someone is sure to write and give a fix. Idea etc. The jury rig I described in the other post , with the solenoid patched in , will flip the actuators open right away when it is energized at 3500rpm. Its really just a copycat of the later cars. I have no idea what triggers your solenoid. Probably rpm related.