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! |
BUMP...
No body else with a S5 has removed the cat huh! ;) |
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. |
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. By your sig, I take it that it was done on the 1991? |
yup
|
ummm btw, what is that hose for.....?
|
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.
|
i hear that it feeds air into the cats, but im not sure.
|
Are you guys talking about this one? This pipe feeds from the airpump to the cat.
http://www.imagestation.com/picture/...c/faa3e083.jpg |
i also am under the understanding that it is feeding fresh air to the cats..fresh air is supposed to fuel the fire better..so the cats burn more efficiently
|
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? |
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. |
Originally posted by poor college student ummm btw, what is that hose for.....? |
You dont need to cap it since there isnt supposed to be vacuum. It will just push air out under the car.
|
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.
|
ziptie those bitches open!
|
Then you get no torque down low!
|
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. |
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. |
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. |
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. Just because Mazda put something there for a reason does not make their reasoning correct. Ever thought about the sub-zero start assist? |
Ever thought about the sub-zero start assist? Yeah you're right about that, the sub zero isn't worth a crap. |
so on an s5, i can cap it and just find a way to get it held up and i'll be fine?
|
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. By your philosophy, the catalytic convertors were put there for a reason, by Mazda, yet you removed them. Same thing applies here. |
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..: |
Originally posted by poor college student so on an s5, i can cap it and just find a way to get it held up and i'll be fine? This only applies to during the installation of a exhuast system where the main catalytic convertor is being removed. |
Originally posted by Templeswain 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..: Check for yourself at: www.racingbeat.com go to 86-92 section, then scroll down to exhaust components. You will see the difference in the presilencers. Mazdatrix needs to either update thier website, or offer both sets of available products. |
By your philosophy, the catalytic convertors were put there for a reason, by Mazda, yet you removed them. Same thing applies here. I guess so. But just capping stuff off sometimes has backfired when I simply assumed I "didn't need it" So if I sit down and think about it, the cats I replaced with a presielncer for the reason of better flow, not just simply because I didn't need them. Since RB put the hose outlet on the presielncer in my system for the S4 and S5, I'll hook it up too. The philosphy does apply. |
Originally posted by Templeswain By your philosophy, the catalytic convertors were put there for a reason, by Mazda, yet you removed them. Same thing applies here. I guess so. But just capping stuff off sometimes has backfired when I simply assumed I "didn't need it" So if I sit down and think about it, the cats I replaced with a presielncer for the reason of better flow, not just simply because I didn't need them. Since RB put the hose outlet on the presielncer in my system for the S4 and S5, I'll hook it up too. The philosphy does apply. Also, I think you missed the point. RB did NOT put the hose outlet on their current S5 presilencer. You can't connect the split air hose with the system the provide. I know, I recently installed one. |
This is RB's current S5 presilencer. Where would you connect the split air pipe? There is no provision for it, you would have to custom weld weld it.
https://www.rx7club.com/attachment.p...postid=2309558 |
Here is the one for S$'s, with the pick-up attached for the split air pipe feed.
See what I mean? https://www.rx7club.com/attachment.p...postid=2309567 |
RB did NOT put the hose outlet on their current S5 presilencer Hmmm I wonder what the effect would be if I took it off and capped it because I got my set up from mazda trix a few years back when I was running my s4 and I now have an s5. I put my RB set up on it....Though the 91 does now have an s4 block in it. I assumed the set up uniform for s4 and s5 because it said 86-92..... I think it may be time for a cap or a new s5 presielncer.... |
Originally posted by Templeswain RB did NOT put the hose outlet on their current S5 presilencer Hmmm I wonder what the effect would be if I took it off and capped it because I got my set up from mazda trix a few years back and I now have an s5. I put my RB set up on it....Though it does now have an s4 block in it. I assumed the set up uniform for s4 and s5 because it said 86-92..... I think it may be time for a cap or a new s5 presielncer.... |
All times are GMT -5. The time now is 04:58 AM. |
© 2024 MH Sub I, LLC dba Internet Brands