breesej

If you have an 89+ model, yes. The air comes from the air pump to a soleniod valve (orange) which vents the air to atmosphere (NO) then the ECU delivers 12V to the soleniod valve (NC) at a specific RPM/engine load combination which diverts the air to the aux ports.

It is far easier to fix a malfunctioning 89+ aux port issue than to wire them open, however the 84-88 aux ports are easier to wire open than fix.... trippy

kim307

iTrader: (1)

Well if the S5 extends to open the aux ports, then obviously the grease method to test them won't work, right?

*If* I get a free flow exhaust system how would I open the aux ports and the VDI port?

This is so confusing because there's a deviation to an already complicated issue. S4 or S5.

Someone please please please explain how you would open those aux ports up *IF* you have a free flow exhaust for both S4 and S5.

Jay Kim

breesej

for 89+ models the air pump in conjunction with solenoid valves operate the aux ports and the VDI. both of these use pressure to operate. there is no dependancey on the exhaust system to do anything but remove gasses from the motor

For 84-88, the aux ports need vacuum which is supplied by the exhaust and a one way check valve in the air pipe. I'm not sure how the VDI works for the 84-88 models. as for free flow exhasut, RB claims that their system still allows that the aux ports will open normally with their system. just make sure your aux port actuators are not siezed and they move with the required amount of vacuum

kim307

iTrader: (1)

So what you're saying is that even if I get a totally free flow exhaust, "true dual exhaust", the 5 and 6 ports and the VDI will still open up?

Jay Kim

J-Rat

iTrader: (2)

Actually, 0n 84-88 they work on BACKPRESSURE from the main cat through the port air pipe (I think the one that goes to the cat is port air, could be split). If you have a 5th gen motor, you have what I believe are electronically actuated cats. So free flowing exhaust doesnt affect your 6-port operation. For those of us with 4th gen motors, you get to try to rig something because you loose your backpressure. These ports are supposed to open at about 1-2 PSI. But mine are old and dont seem to move before 2.5 PSI.

J-Rat

iTrader: (2)

OOps, its too early. I dont know how the 5th gen motors 6-ports actuate, but I know that it has nothing to do with the exhaust backpressure....4th gen, Exhaust backpressure..

blue88gxl N/A

hey Splortch

is that a pic of the ACV blocked off..
what does the acv do just bleed air??

rx7gtu

So now we've got a 5 gen with free flow exhaust (like mine) an air pump that works the 6 port. Stupid me wants to remove the air pump, but still have the best of both worlds. I'm begining to see the light (slowely). How does the electronic actuator work? Does anybody make this set up?
Thanks for the patience...

NZConvertible

But wouldn't fixing them properly be a better solution. It just seems like a waste of a really good idea. I bet if you suggested to a Honda owner to do the same thing to his V-TEC he'd think you were nuts.

rx7gtu

would an autometer rpm sensor working a solenoid work to port actuator?

HAILERS

An airpump does not use squat in terms of robbing power. Its not a power robber like an air conditioner. On my old 87 na I can pull 7500 in forth with the airpump and acv and the air conditioner turned on at the same time, driving up an uphill grade. Just make the darn car run like when it was new. Just a thought.

AcmeSkater

I don't know if this has been said but yes wireing them open does make you loose torque and no it is not worth it in high end, a race is won at the launch(most of the time). Just wire a RPM switch to them and have them open at a certain RPM, look at that torque and a little high end. I wonder why people don't do this instead of wireing them open.

NZConvertible

That's just what the ECU does! It switches the solenoid valve at 3850rpm; the air pump then opens them.

rx7gtu

I think that I have decided to leave the air pump on, but use the main underdrive pully. I should have enough power with short headers and race pipe, and cold air intake to keep me happy.