Second O2 bypass (after cat / catalytic converter delete)
Originally posted by Brian.
Available at your local automotive store. Spark Plug Non Fouler PN 42009 ($4.99)
http://i21.photobucket.com/albums/b2...0o2cheat/1.jpg
http://i21.photobucket.com/albums/b2...0o2cheat/2.jpg
http://i21.photobucket.com/albums/b2...0o2cheat/3.jpg
http://i21.photobucket.com/albums/b2...0o2cheat/4.jpg
You now need to drill out 1 of the non foulers using a 1/2" drill bit. When finished this is what it will look like.
http://i21.photobucket.com/albums/b2...0o2cheat/5.jpg
http://i21.photobucket.com/albums/b2...0o2cheat/6.jpg
Side by Side comparision of the orignal and now modified non foulers
http://i21.photobucket.com/albums/b2...0o2cheat/7.jpg
http://i21.photobucket.com/albums/b2...0o2cheat/8.jpg
o2 Sensor inserted in the modified non fouler
http://i21.photobucket.com/albums/b273/ ... heat/9.jpg[/img]
Second, unmodified non fouler now installed on modified non fouler
http://i21.photobucket.com/albums/b2...o2cheat/10.jpg
Original non fouler->Modified non fouler->o2 sensor
http://i21.photobucket.com/albums/b2...o2cheat/11.jpg
Fully installed
http://i21.photobucket.com/albums/b2...o2cheat/12.jpg
The idea behind it is when you remove the cat the 2nd o2 sensor is going to have too much crap reaching the sensor that isnt filtered out, which will make it think the cat has gone bad. What this does is it moves the o2 sensor further away so a limited amount of exhaust gets to the o2 sensor, it is a VERY little ammount that actually gets to the sensor but as long as it is considerably less than the primary o2 sensor then it wont cause a CEL.
from (http://www.k-series.com/forum/showthread.php?t=8833) pics rehosted by me incase the thread/pics disappear.
re: Second O2 bypass (after cat / catalytic converter delete)
Just a bump for the new blood in the forum and a question...
In the PN42009 kit, are we supposed to use the washers that come with?
I thought, in the past, I read that a washer or two was used. Any input?
Thanks
Jason
re: Second O2 bypass (after cat / catalytic converter delete)
So I'm thinking about doing this in the next few days.... I'm planning on getting a "highEST flow cat" possible, i.e. piece of pipe the same diameter as the pipe before/after the cat with two flanges to fit that in there... It's a cheaper version of cat-delete header... I was deciding for a while, but I just don't see myself spending 370 bucks right now on a header that gives me 11 hp... $50 bucks - another story.
This is a great write up and I hope it works for me too, because I'm almost sure I'll get a CEL as soon as I take out the cat and put in a piece of pipe.... :D
Edit: just found out that what I'm having ideas about is called a "test pipe".
re: Second O2 bypass (after cat / catalytic converter delete)
you probably wont get the same gain as its not really just the cat that makes the stock set up restrictive.
re: Second O2 bypass (after cat / catalytic converter delete)
True, the exhaust ports on the stock exhaust manifold are tiny and poorly machined. If you have some spare time you could pop it off and shave them a little bit for better flow. I think for my 09' I'm gonna leave the stock exhaust manifold, but do as I stated above ^, leave the cat, but then bolt a new flange to the cat and run a 2.25" straight pipe back into a Flowmaster 60 and pipe is straight out the driver's side in front of the rear tire. Should flow pretty good with no flex pipe or resonators.
re: Second O2 bypass (after cat / catalytic converter delete)
Quote:
Originally Posted by Wolfman AK907
True, the exhaust ports on the stock exhaust manifold are tiny and poorly machined. If you have some spare time you could pop it off and shave them a little bit for better flow. I think for my 09' I'm gonna leave the stock exhaust manifold, but do as I stated above ^, leave the cat, but then bolt a new flange to the cat and run a 2.25" straight pipe back into a Flowmaster 60 and pipe is straight out the driver's side in front of the rear tire. Should flow pretty good with no flex pipe or resonators.
So you would be leaving the most restrictive pieces in then? Isn't the manifold and the cat two most restrictive pieces in the system? (feel free to correct me, I know that you guys have quite a bit more experience with cars than I do so I'm trying to absorb as much knowledge as I can from you while I can). My flex pipe already got replaced with a shorter one but bigger diameter (2.25" I think) and the rest of the pipe after that is pretty much straight 2.25" with one small resonator (aftermarket) and a straight through twister exhaust. So what you are saying if I did go with the test-pipe, I wouldn't see any noticeable improvement? I'm trying to weigh all my options here. :D Thank you for all the info.
re: Second O2 bypass (after cat / catalytic converter delete)
So how restricitive is the resonator on our stock exhaust?
re: Second O2 bypass (after cat / catalytic converter delete)
Quote:
Originally Posted by reddemonx92
So how restricitive is the resonator on our stock exhaust?
Which one of the two? :wink: I think our original muffler is what's doing the most restricting from the cat-back... correct me if I'm wrong.
re: Second O2 bypass (after cat / catalytic converter delete)
This is the one i went with
http://www.directtuning.com/store/pc-72599-73-blox.aspx
cheap and i think it works better than the homemade one. I did try the nonfouler trick and yes it worked but eventually broke due to the threaded area being so thin and the vibration from the car.
the blox one is solid though. my .02
re: Second O2 bypass (after cat / catalytic converter delete)
Quote:
Originally Posted by one_man_jam
This is the one i went with
http://www.directtuning.com/store/pc-72599-73-blox.aspx
cheap and i think it works better than the homemade one. I did try the nonfouler trick and yes it worked but eventually broke due to the threaded area being so thin and the vibration from the car.
the blox one is solid though. my .02
The non-fouler that I bought from the store (same part number as in the DIY above) seems to look a little different than the one above. I'm going to try it first since I already did all the drilling, but I will keep this one in mind in case this one does break. Which thread broke, the inner one that is drilled out? And also, did you use the washers/crush gaskets that came with it?
Edit: it does look like it's a lot easier to work with though and it's the same price (unless they charge for shipping) with no drilling involved.
re: Second O2 bypass (after cat / catalytic converter delete)
Quote:
Originally Posted by XJCasper
Just a bump for the new blood in the forum and a question...
In the PN42009 kit, are we supposed to use the washers that come with?
I thought, in the past, I read that a washer or two was used. Any input?
Thanks
Jason
Did you ever get this installed? How did it work out? I'm thinking of using the gaskets/washers that came with it just to keep the seal, but if it does break, I'm going with one_man_jam's choice and getting the blox.
re: Second O2 bypass (after cat / catalytic converter delete)
Quote:
Originally Posted by serega12
Quote:
Originally Posted by one_man_jam
This is the one i went with
http://www.directtuning.com/store/pc-72599-73-blox.aspx
cheap and i think it works better than the homemade one. I did try the nonfouler trick and yes it worked but eventually broke due to the threaded area being so thin and the vibration from the car.
the blox one is solid though. my .02
The non-fouler that I bought from the store (same part number as in the DIY above) seems to look a little different than the one above. I'm going to try it first since I already did all the drilling, but I will keep this one in mind in case this one does break. Which thread broke, the inner one that is drilled out? And also, did you use the washers/crush gaskets that came with it?
Edit: it does look like it's a lot easier to work with though and it's the same price (unless they charge for shipping) with no drilling involved.
it was the threaded part of the drilled one that broke. i can't really remember if i used the provided washer or if the one i bought even came with one, but if it did then i think i did use it. for the price its definitely worth a try though :D
re: Second O2 bypass (after cat / catalytic converter delete)
Quote:
Originally Posted by one_man_jam
for the price its definitely worth a try though :D
And I will give it a try. :D one thing that non fouler method has going for it (for me anyways) is that I could pick it up at the store and have it the same day. Plus, now that its drilled, all I have to do is install it.
re: Second O2 bypass (after cat / catalytic converter delete)
Due to my schedule I have not gotten around to installing the header.
Nope, no one has answered the washer question. Let me now if and where you install them.
Thanks
Jason
re: Second O2 bypass (after cat / catalytic converter delete)
Quote:
Originally Posted by XJCasper
Due to my schedule I have not gotten around to installing the header.
Nope, no one has answered the washer question. Let me now if and where you install them.
Thanks
Jason
I'm planning on installing one between the foulers and another one between the fouler and the exhaust. one_man_jam's broke before so he went with another part number (it's in the post above), but since I already did all the drilling, I'm going to try this one first. I will keep you posted.
And what header are you putting in? Is it xiaogary's header? cat-less?
re: Second O2 bypass (after cat / catalytic converter delete)
I honestly don't know what the most restrictive part is. In my situation, I want to leave the stock manifold and cat because I need that restriction...If I ran a header and a test pipe like I want, my car would never warm up at -50*F.
re: Second O2 bypass (after cat / catalytic converter delete)
Quote:
Originally Posted by Wolfman AK907
I honestly don't know what the most restrictive part is. In my situation, I want to leave the stock manifold and cat because I need that restriction...If I ran a header and a test pipe like I want, my car would never warm up at -50*F.
But it's WAY colder up there where you're at. :D Where I'm at my main concern lies with CAI (discussed in a couple of other threads) sucking up water and hydrolocking my engine. But that cold is not an issue in Seattle area... I actually miss snow quite a bit - I grew up with four proper seasons... :D Lived in Seattle for over 10 years but still miss having my winter and my summer... not a year-round rain season with 3-6 weeks of sunshine... :D But I'm already settled here for now.
re: Second O2 bypass (after cat / catalytic converter delete)
You can still run a CAI without risk of hydro-lock, just use a hydro shield on your filter like this: http://www.racinglab.com/injen-hydroshield-x1033.html or the bypass is like this: http://www.tirerack.com/engine_tuning/d ... sp?ID=1082
re: Second O2 bypass (after cat / catalytic converter delete)
Quote:
Originally Posted by Wolfman AK907
Nice... I just ordered the exact hydro shield (or Drycharger filter wrap as K&N calls it) specifically for my filter: http://www.knfilters.com/search/product ... =RX-4990DK should I also order the bypass or would that be an overkill? And it says that the bypass is only designed for AEM CAI's.. does that mean that it won't work with ChromeIntakes CAI? And also, where in ChromeIntakes would I put a bypass, if I even need it... Thanks for the input.
re: Second O2 bypass (after cat / catalytic converter delete)
You'd put the bypass where the two pipes come together. In other words, you'd substitute the silicone coupler for the bypass.
re: Second O2 bypass (after cat / catalytic converter delete)
Well, you're in WA...I would put a bypass on just in case. For the money you'd spend on it for peace of mind I'd do it.
