Aux ports
08-31-05, 12:02 AM
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Aux ports
I have a S5 N/A and the previous owner has removed the air pump and ACV. I was just wanting to know if a vacuum line off the exhaust header is sufficient to open the ports? It is a Racing Beat header and I am not sure if they come with the little nipple for that reason or if the guy put it on there? So any info on this subject would be appreciated, I was really wanting to stay away from the electric and air pump actuation.
08-31-05, 12:30 AM
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The previous owner was a dumbass (man I'm in a pricky mood tonight) s5's use the AIR PUMP pressure to open the six ports............ through a solenoid that opens automatically... no mucking about with backpressure from the exhaust...
People that don't know about that, usually rip the air pump off and then lose their 6-ports on the s5's
if you don't have a cat, and straight through mufflers... no way in hell is there going to be enough pressure in your exhaust system to open those ports..
YES... the headers come with the niple for s4's vac ports.. but, again, read above...
People that don't know about that, usually rip the air pump off and then lose their 6-ports on the s5's
if you don't have a cat, and straight through mufflers... no way in hell is there going to be enough pressure in your exhaust system to open those ports..
YES... the headers come with the niple for s4's vac ports.. but, again, read above...
08-31-05, 04:06 AM
#5
If you keep the RB exhaust your exhaust ports will work just fine. Just don't expect them to work if you hook up the pressure tube to the aux port nipple(AND THE VDI, don't forget that!) and you slap on some cheap cork sport **** or some OBX crap from ebay that IS NOT going to work.
I personally have a set of S4 true duals hooked up with the pressure tube and my ports and VDI can be felt opening, so using an S4 exhaust with pressure tubes with a DECENT catback will work without needing to keep the air pump.
BTW RB mufflers and silencers are STRAIGHT through but are designed to leave enough pressure in the exhaust for this to work.
EDIT: don't wire the open. It defeats the entire purpose of having them. And I don't want anyone starting a "wired ports vs. functioning ports" flame war.
Its clear that MAZDA spent millions of dollars R&D'ing the RX-8 and guess what it has a variable intake port setup. Not ONLY that but its got MORE complexity meaning the aux ports do their job the VDI does its JOB and even more can be done by researching tunned intakes. So stop wiring your **** open thinking you're out thinking MAZDA. I don't think they wasted all the millions of dollars on NOTHING!
I personally have a set of S4 true duals hooked up with the pressure tube and my ports and VDI can be felt opening, so using an S4 exhaust with pressure tubes with a DECENT catback will work without needing to keep the air pump.
BTW RB mufflers and silencers are STRAIGHT through but are designed to leave enough pressure in the exhaust for this to work.
EDIT: don't wire the open. It defeats the entire purpose of having them. And I don't want anyone starting a "wired ports vs. functioning ports" flame war.
Its clear that MAZDA spent millions of dollars R&D'ing the RX-8 and guess what it has a variable intake port setup. Not ONLY that but its got MORE complexity meaning the aux ports do their job the VDI does its JOB and even more can be done by researching tunned intakes. So stop wiring your **** open thinking you're out thinking MAZDA. I don't think they wasted all the millions of dollars on NOTHING!
Last edited by 1987RX7guy; 08-31-05 at 04:14 AM.
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