S5 cat removal, what to do with air hose?
#1
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S5 cat removal, what to do with air hose?
I'm referring to the hose that connects from the lower intake manifold and runs to the air tube on the catalytic converter.
Now that I have removed the cat and replaced with a header-presilencer setup what do I do with the outlet connection to the intake manifold?
Should this connection be plugged or does it need to be able to flow air (as if there was still a cat) to keep the pressures balanced in the intake manifold?
Thanks!
Now that I have removed the cat and replaced with a header-presilencer setup what do I do with the outlet connection to the intake manifold?
Should this connection be plugged or does it need to be able to flow air (as if there was still a cat) to keep the pressures balanced in the intake manifold?
Thanks!
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Originally posted by kd86rx7
wat i did for my car was take off the pipe and plug up the hose that was connected to the other end of hte piping.
eric.
wat i did for my car was take off the pipe and plug up the hose that was connected to the other end of hte piping.
eric.
By your sig, I take it that it was done on the 1991?
#7
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I had it welded into the pipe that took the cats place. I don't have a header, just a ghetto pipe welded in place of the cat. I don't know what That hose is for, though.
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#11
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ummm...
header with presilencer....is it still loud...
my fc is about to blow my brain out.. i have no cat striahgt with hks hi power...ahh.. im thinking of gettin a presilencer.. does it work?
my fc is about to blow my brain out.. i have no cat striahgt with hks hi power...ahh.. im thinking of gettin a presilencer.. does it work?
#12
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That pipe can be capped or left open.
On an NA with a header, silencers are a must.
There are pictures of my cheapo header-silencer setup and a sound bite linked in my sig below.
On an NA with a header, silencers are a must.
There are pictures of my cheapo header-silencer setup and a sound bite linked in my sig below.
#13
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Originally posted by poor college student
ummm btw, what is that hose for.....?
ummm btw, what is that hose for.....?
#18
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Originally posted by beefhole
You can remove it (the whole air pump) since you put a header and all those goodies. But now you have to find a way to get your ports to open at 3800rpm.
You can remove it (the whole air pump) since you put a header and all those goodies. But now you have to find a way to get your ports to open at 3800rpm.
#19
I wish I was driving!
Hey, nice work on the car.
If you want, do nothing. Leaving the split air pipe open will cause no adverse effects.
You can also cap it with a large hose cap.
If you want, do nothing. Leaving the split air pipe open will cause no adverse effects.
You can also cap it with a large hose cap.
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I'm of the philosophy now that if mazda put it there it was for a reason.
I was under the impression that this pipe that comes from the cat provides back pressure for The ACV to function correctly or more efficiently?
My racingbeat header and presielencer package came with the pipe extension that was on the cat. But before I got the RB, I had a crappy ghetto straight pipe in there with no hook up back to the lower intake manifold.....And it was a dog off the line.
I was under the impression that this pipe that comes from the cat provides back pressure for The ACV to function correctly or more efficiently?
My racingbeat header and presielencer package came with the pipe extension that was on the cat. But before I got the RB, I had a crappy ghetto straight pipe in there with no hook up back to the lower intake manifold.....And it was a dog off the line.
#21
I wish I was driving!
Originally posted by Templeswain
I'm of the philosophy now that if mazda put it there it was for a reason.
I was under the impression that this pipe that comes from the cat provides back pressure for The ACV to function correctly or more efficiently?
My racingbeat header and presielencer package came with the pipe extension that was on the cat. But before I got the RB, I had a crappy ghetto straight pipe in there with no hook up back to the lower intake manifold.....And it was a dog off the line.
I'm of the philosophy now that if mazda put it there it was for a reason.
I was under the impression that this pipe that comes from the cat provides back pressure for The ACV to function correctly or more efficiently?
My racingbeat header and presielencer package came with the pipe extension that was on the cat. But before I got the RB, I had a crappy ghetto straight pipe in there with no hook up back to the lower intake manifold.....And it was a dog off the line.
Just because Mazda put something there for a reason does not make their reasoning correct. Ever thought about the sub-zero start assist?
#24
I wish I was driving!
Originally posted by Templeswain
Ever thought about the sub-zero start assist?
Yeah you're right about that, the sub zero isn't worth a crap.
Ever thought about the sub-zero start assist?
Yeah you're right about that, the sub zero isn't worth a crap.
By your philosophy, the catalytic convertors were put there for a reason, by Mazda, yet you removed them. Same thing applies here.
#25
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However this is the exhaust system I have.
http://www.mazdatrix.com/pictures/racing/r8-rb.jpg
It is sold for the 86 through 92 completely and does accomodate for the hose..:
http://www.mazdatrix.com/pictures/racing/r8-rb.jpg
It is sold for the 86 through 92 completely and does accomodate for the hose..: