5th and 6th ports opening?
01-29-07, 08:40 AM
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5th and 6th ports opening?
i bought my car with a 2.5 exhaust from the stock manifold to a fart can. i was wondering if my 5th and 6th ports are still opening?
01-29-07, 08:54 AM
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Aux Port Test
For those with series 5 N/A's, the port actuators push to open, and only under high load. The S4’s pull to open.
To test them, run a tube to the actuator, T in a pressure gauge and blow into the tube to check at what pressure they open.
(A cheap boost gauge will do.)
Then reconnect the pressure tube & T in a long tube to inside the cabin, with the gauge on the end, and do a test drive to see when they open.
This also works for the S5’s VDI.
When they stick, it's usually the shaft & not the internal sleeves.
Just work in some penetrating oil where the shaft goes into the LIM.
To see the performance difference, I T’d a “mity-vac” hand pump in the tube near the guage, then did some low end a 3rd gear pulls from 1500 to 3500 rpm. The low end time was more than 1 second faster with the ports closed.
For those with series 5 N/A's, the port actuators push to open, and only under high load. The S4’s pull to open.
To test them, run a tube to the actuator, T in a pressure gauge and blow into the tube to check at what pressure they open.
(A cheap boost gauge will do.)
Then reconnect the pressure tube & T in a long tube to inside the cabin, with the gauge on the end, and do a test drive to see when they open.
This also works for the S5’s VDI.
When they stick, it's usually the shaft & not the internal sleeves.
Just work in some penetrating oil where the shaft goes into the LIM.
To see the performance difference, I T’d a “mity-vac” hand pump in the tube near the guage, then did some low end a 3rd gear pulls from 1500 to 3500 rpm. The low end time was more than 1 second faster with the ports closed.
01-29-07, 09:06 AM
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If you still have the emmissions air pump, it can be tapped to provide the increasing pressure to blow them open.
If not, you have to rig an RPM triggered electric pump.
If not, you have to rig an RPM triggered electric pump.
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01-29-07, 02:22 PM
#8
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A word of advice about the lumbar pump option: I've heard many lumbars aren't rated for continuous duty, and one member in particular found that his cut out due to overheating after ~3 minutes; the system isn't 100% reliable. I would look into the stock air pump switched with air solenoids.
01-29-07, 02:37 PM
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Most of us only use full power in short bursts, so the aux ports are not open continuously.
The longest they are likely to be open is accelerating up a long mountain grade.
The stock air pump is best, but if it's gone, you have to get creative.
I used an air horn compressor on my prior NA.
The longest they are likely to be open is accelerating up a long mountain grade.
The stock air pump is best, but if it's gone, you have to get creative.
I used an air horn compressor on my prior NA.
01-29-07, 02:47 PM
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Originally Posted by stevej88na
A word of advice about the lumbar pump option: I've heard many lumbars aren't rated for continuous duty, and one member in particular found that his cut out due to overheating after ~3 minutes; the system isn't 100% reliable. I would look into the stock air pump switched with air solenoids.
01-29-07, 02:48 PM
#11
Use the air pump or wire them open, wire them open and see if you still like how it acelerates, if you do it's probably easiest to just leave it that way.
Needless to say, some of us do auto-x and race and do have our engines at high speeds alot of the time.
Needless to say, some of us do auto-x and race and do have our engines at high speeds alot of the time.
01-29-07, 03:09 PM
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Originally Posted by SureShot
Aux Port Test
For those with series 5 N/A's, the port actuators push to open, and only under high load. The S4’s pull to open.
To test them, run a tube to the actuator, T in a pressure gauge and blow into the tube to check at what pressure they open.
(A cheap boost gauge will do.)
Then reconnect the pressure tube & T in a long tube to inside the cabin, with the gauge on the end, and do a test drive to see when they open.
This also works for the S5’s VDI.
When they stick, it's usually the shaft & not the internal sleeves.
Just work in some penetrating oil where the shaft goes into the LIM.
To see the performance difference, I T’d a “mity-vac” hand pump in the tube near the guage, then did some low end a 3rd gear pulls from 1500 to 3500 rpm. The low end time was more than 1 second faster with the ports closed.
For those with series 5 N/A's, the port actuators push to open, and only under high load. The S4’s pull to open.
To test them, run a tube to the actuator, T in a pressure gauge and blow into the tube to check at what pressure they open.
(A cheap boost gauge will do.)
Then reconnect the pressure tube & T in a long tube to inside the cabin, with the gauge on the end, and do a test drive to see when they open.
This also works for the S5’s VDI.
When they stick, it's usually the shaft & not the internal sleeves.
Just work in some penetrating oil where the shaft goes into the LIM.
To see the performance difference, I T’d a “mity-vac” hand pump in the tube near the guage, then did some low end a 3rd gear pulls from 1500 to 3500 rpm. The low end time was more than 1 second faster with the ports closed.
correction "S4" ports are open when the linkage rods are pushed in and "S5" ports are open when they're pulled out...
01-29-07, 03:11 PM
#13
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Originally Posted by TehMonkay
Needless to say, some of us do auto-x and race and do have our engines at high speeds alot of the time.
link to Deal's gap video
01-29-07, 04:01 PM
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well i do like to go 135 miles an hour..so do i really even need the 5th and 6th ports. i mean im sure i do, its not like emissions crap and mazda put it there for a reason. so a final vote. wire in a pump, or just say **** it till i port the motor and then deal with it?
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