Can someone please tell me about exhaust back pressure thats supposed to open the auxillary ports in my 90 model

ive heard lots of different opinions about how i should NOT run headers as i will lose the required back pressure to open these ports thanx and hi from Australia.

well i have an 88 that needs the backpressure for the actuation. I have Racing beat headers and full exhaust, and i have enough backpressure for the secondaries to open up...you shouldnt have a problem.

thxs for answering that i have always wonder that!https://www.nopistons.com/forums/pub...IR#>/smile.png

no prob..=) i have the small pipe coneected right after the headers...https://www.nopistons.com/forums/pub...#>/BURNOUT.gif

What small pipe?

and how can u have any backpressure when useing headers unless you drive around with tennis balls stuck in your pipes.

series V 7's are '89 + right? anyway series Y cars auxilary ports are opened by air pump/ solenoid combo. what opens the solenoids i'm not quite sure. '86- '88 run off exhaust backpressure.

yes im curious too, what small pipe>????

I suppose this is why most places just sell a midpipe....

There is a small hose (maybe 1/8" or 1/4" ID) that connects to the header pipe from the 2nd exhaust port. You only need 2 - 3 psi to open them. Or if you have a cat. converter you can run a split air tube from the cat.

Yep. on the 86-88 13B's the secondaries open up using a small amount of pressure from the exhaust. Yes, i do have headers, and yes, it obviously has atleast 2-3 psi of pressure in the pipes, it does have that back pressure in there. and i dont have tennis balls up in my ****. Like ILUV wrote, its a small tube/pipe wutever that connects to the exhaust to get pressure from the exhaust to open up the ports...Im not on crack. Sorry...didnt realize you have a 90. MY BAD..