Peeps
I have a theory that the link pipe for the secondary air pipe has a negative effect on the tuning ( such as it is) of the exhaust
I did an experiment on my tubular manifold a few years ago where I blocked it off so each port was closed and found the airflow was increased at lowish rpm ( 3000rpm or so)
sadly no dyno results to back this up but being as I had to add more fuel I felt it was worthwhile
had to switch back to the OEM manifold because of the usual cracks and falling to bits of the tubular bit
has anyone else tried this ?
Deletion of 2ndry air pipe
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warpc0il
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Re: Deletion of 2ndry air pipe
The cheap tubular manifolds make a bit of a bodge in the way the Secondary Air is connected - very much an afterthought.
Whether the "improvement" you describe is from the edge effect of each hole into the tube, or the cross-connection of the tubes, is debatable.
Many people remove the SAS itself anyway, with no ill effects, as long as they also map out associated CELs.
Some have "tidied-up" rather than just block off the SAS-in port on their aftermarket manifolds, but I don't expect anyone has back-to-back dyno checks or any such evidence, where this is the only change between.
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Whether the "improvement" you describe is from the edge effect of each hole into the tube, or the cross-connection of the tubes, is debatable.
Many people remove the SAS itself anyway, with no ill effects, as long as they also map out associated CELs.
Some have "tidied-up" rather than just block off the SAS-in port on their aftermarket manifolds, but I don't expect anyone has back-to-back dyno checks or any such evidence, where this is the only change between.
Sent from my SM-G556B using Tapatalk