ok i have a 1988 vert with a rb header and true duel exhaust thats straight piped to a set of mufflers and no emmisions, my question is i have my acuators took off my 5th and 6th ports and their closed i know im getting more low end tourqe and losing high end hp. my question is would i have more of an advantage with them open for power with my exhaust set up. and dont say it depends on how i dive and what type of driving i normally do, its a ******* rotary it likes the high end.
thanks
oh and my car sounds like one of these

 

Closed, you gain low end torque & lose high end power.

Open, you lose low end torque & gain high end power.

With your setup, I think you're losing WAY more up high than you're gaining down low, so if I had to leave them in one position, I'd leave them open.

However, you can build (fairly cheaply) a setup that will use an RPM switch & small air compressor to actuate the ports. http://www.rotaryresurrection.com/2n...elec6port.html is one such setup.

-=Russ=-

 

Closed you don't lose or gain low end, but you do lose high end.

Open you do lose low end, but you don't lose or gain high end.

Nothing is gained either way. All you can manage to do is lose power.

 

You're right. I was referring to gain/loss at low end vs the ports being in the other position, but didn't specify that clearly.

-=Russ=-

 

ok you can hook up your actuators again just remove the vacume control module that controls that actuators and run the vacume line straight to the actuators. I have done this on a S5 and they opened at 2000-2500 consistantly and still work over a year later. Leave it to straight vacume because at low rpms the engine does not pull enough vacume to open them until 2000-2500 and it is a fast open when accelerating and you feel it.

 

*confused*

The aux ports actuators, both S4 and S5, are operated by pressure (above atmospheric) in the 2-4psi range.

On the S4, they're normally driven by exhaust backpressure, totally isolated from the vacuum system.

On the S5, they're driven by positive pressure from the air pump. I'm hoping this is what you're talking about (bypassing the solenoid & driving them straight from air pump output), because talking about vacuum with regards to the aux port actuators just doesn't make any sense.

-=Russ=-

 

I'd love to know why you they were opening, because connecting them to a vacuum would actually be holding them closed right through the rev range. As mentioned, they only open with pressure...

 

when I disconnected them on a S5 I felt vacume on the hose so I bypassed the selonoid and it worked perfect.

 

And multiple people are telling you that the actuators actuate with pressure, not vacuum.

Likely what's happening on the S5 is that the air pump is providing enough pressure to open them without the solenoid, though they're probably opening way early.

-=Russ=-