Test pipe Wideband O2 reading...

[Sil240]

I have a test pipe it looks like this guy below.Notice that the O2 bung is down a long tube 90 to the flow of the pipe.Now I was wondering that if this will affect the reading of my wideband O2???I know that when people take out cats etc... they put a longer tube of the O2 sensor so the ECU wont throw a code. (So I've heard)

But... hearing that.That means that the wideband isn't going to be sampling correctly from the exhaust stream..

Am I right or does it not make a difference.

[Largekid]

your wideband sensor can be mounted at any angle on the test pipe besides a angle where water or condensation can hit the sensor itself. If you stay on the top half of the test pipe you should be fine.

[Sil240]

The problem is not the angle.The problem is the distance away from the exhaust flow going through the pipe.

It seeems my pic didn't work.Check out this link:

http://2fastlane.com/blog/wp-c...t.jpg

[240z4u]

I suspect your better off having it in the exhaust stream... is that pipe threaded all the way to the exhaust tube? If so, just cut it off and shorten it.

Evan

[gawdzilla]

i would agree. putting it in that little tube will keep the sensor out of the stream, which you don't want to do. and yes, people normally do this with their factory narrowbands so they do not pick up a reading to avoid throwing codes.

i think that bung is not the right thread/size (too small) anyway for an o2. that is the megan test pipe, no? just find a bolt that will fit in there and block it. then take the piece to a muffler shop and they should be able to put a real o2 bung on it.

[Sil240]

I have no idea which brand mine is.I bought it for $10.00.But it looks just like that except the tube is in the middle of the pipe i believe and its long like that.It already has plug in it.I'll have another bung put in.

But...Since Rich Autoworks R.A.W. focked up my downpipe I have to have it fixed.I'm going to have a flex section put in and make it so my downpipe does drag on the ground. (D-Bags)

Should I have them put a O2 bung in the DP also while they are at it?Or should I have it put into the test pipe?

The DP already has the stock O2 sensor and my EGT probe right behind the turbo.So there's no room to put the Wideband up there, but maybe right before the flange that meets the Test pipe.

What do you guys think??

[l0nestar]

I thought you always wanted to do EGT close to #6 exhaust port on header?

and as everyone has stated. just make sure to place your wbo2 sensor so that condensation does not form inside. also check with your WB documentation on how far down stream to place your sensor. test pipe may be too far.. depending on model.

I made a test pipe with a flex coupling inside. It works. I have to re-work my DP when I install my wbo2 though. provided I don't go with a different snail.

[Sil240]

Well the EGT should be at the merge collector infront of the turbo.Or in the worst cyl (6 th)But I have a SSAutocrap stock style manifold and I didn't want to weld into it.

When I get a proper mani, I'll put it in the collector.

The egt does read lower after the turbo.How much lower I have no idea.But i can keep my eye one out of the norm readings.

When I get my DP re-done I'll just have him put the WBO2 in there.To make it easier.I'll use a short length flex piece.

It doesn't matter how far the o2 sensor is, as long as there is no exhaust leaks.Because when we used to dyno cars they would stick a probe in the tailpipe.

I assume that the WBO2's have heaters in them. And also the only difference is delay.But I don't know if it would be noticeable.

[gawdzilla]

just be careful about puttitng the wb02 too close to the turbine exit. they say 16" in the minimum to avoid killing the sensor. if you're putting it at the end of the dp it should be plenty of distance.

[SullivanRacing06]

I have a test pipe it looks like this guy below.Notice that the O2 bung is down a long tube 90 to the flow of the pipe.Now I was wondering that if this will affect the reading of my wideband O2???I know that when people take out cats etc... they put a longer tube of the O2 sensor so the ECU wont throw a code. (So I've heard)

But... hearing that.That means that the wideband isn't going to be sampling correctly from the exhaust stream..

Am I right or does it not make a difference.

wideband needs to be mounted within 10 to 20 inches from the turbo outlet, not 2-3 ft away from the engine bay

[Largekid]

wideband needs to be mounted within 6 or 12 inches from the turbo outlet, not 2-3 ft away from the engine bay

make that 18-30" and you would be correct

aem's install guide...pg 8

http://forum.aempower.com/foru...=4370

[SullivanRacing06]

thanks

[Sil240]

"Mount the O2 sensor in theexhaust system at least 18 inches downstream from the exhaust port. If you anticipatehigh EGT's (over 800C), run a turbocharger, run at high RPM for extended periods oftime or plan on running leaded race fuel then you must mount the sensor at least 36inches or more downstream of the exhaust port as all of these can cause the sensor tooverheat."

So if I put it further then its ok.

Thanks!!