Second bung on CP-e downpipe

[Erich]

On the cast mouth downpipes, is the second bung (or should I say the first bung, the one that is originally cast) usable with the stock exhaust manifold? Doesn't seem like there is enough clearance to put a sensor in there.

[www.cp-e.com]

Originally Posted by Erich On the cast mouth downpipes, is the second bung (or should I say the first bung, the one that is originally cast) usable with the stock exhaust manifold? Doesn't seem like there is enough clearance to put a sensor in there.

You've got it right. The cast bung is a provision for a thermocouple if you want to monitor exhaust gas temperatures. You can buy oxygen sensor to EGT probe adapters that you can use with that threaded hole.

[Erich]

Originally Posted by www.cp-e.com You've got it right. The cast bung is a provision for a thermocouple if you want to monitor exhaust gas temperatures. You can buy oxygen sensor to EGT probe adapters that you can use with that threaded hole.

So a thermocouple for EGT will fit under the stock manifold? Do I need to be concerned with what gauge I am buying or should the thermocouple that comes with pretty much any EGT gauge fit?

[www.cp-e.com]

Originally Posted by Erich So a thermocouple for EGT will fit under the stock manifold? Do I need to be concerned with what gauge I am buying or should the thermocouple that comes with pretty much any EGT gauge fit?

The thermocouple is actually just a thin piece of steel (I forget what alloy the K-type thermocouples are) so it's actually very easy to install in terms of space useage. I *believe* all EGT gauges use type K thermocouples, so it shouldn't make any difference really.

[xcoldricex]

wait i'm confused. so they both accommodate O2 sensors - if you want to run EGT you need an adapter?

a lot of people say you should run a heatsink if you're putting in a new wideband - has it been necessary in your experience?

[www.cp-e.com]

Originally Posted by xcoldricex wait i'm confused. so they both accommodate O2 sensors - if you want to run EGT you need an adapter?

Actually only the wideband bung that we weld on the pipe can accommodate a wideband. If you want to run a secondary wideband (i.e. not the factory wideband) then we can add an extra bung for a small fee. The bung that is cast and threaded for a wideband cannot accommodate a wideband because it hits the manifold. You can however buy an adapter that will thread into that oxygen sensor provision so you may install an EGT probe.

Originally Posted by xcoldricex a lot of people say you should run a heatsink if you're putting in a new wideband - has it been necessary in your experience?

We've heard that before too. I think the Bosch sensors are rated for 1400°F, but I don't think they specify for what period of time. Also, any sensors accuracy is going to be highly dependent upon the heater controller attached to the sensor, and I'm not sure if a heat sink would disrupt that feedback loop.

Translation: I'm of no help

Honestly, I'd just run the sensor and see if it eventually fails. If it does they're not a lot of money so they're (relatively) cheap to replace. But if you were really clever, you'd call Bosch (NGK, or whoever) and ask them directly. Sorry I couldn't be of more help!

[xcoldricex]

Originally Posted by www.cp-e.com Actually only the wideband bung that we weld on the pipe can accommodate a wideband. If you want to run a secondary wideband (i.e. not the factory wideband) then we can add an extra bung for a small fee. The bung that is cast and threaded for a wideband cannot accommodate a wideband because it hits the manifold. You can however buy an adapter that will thread into that oxygen sensor provision so you may install an EGT probe.

eh? so what's the point of having the second O2 bung if you can't use it because it hits the manifold?!

just to make things clear - I want to run a Innovate LM-1 in the second bung in the cast bellmouth - is this not possible?

[7mileshome]

subbing

[Haltech]

Threads on EGT TK's are different across many manf's. You could do the standard o2 sensor bung, than get an adapter for your own TK threads... Or, just tap it yourself.

[Laloosh]

yea i just noticed this, it looks like a aftermaket wb MIGHT fit witht the pg manifold, but i was under the impression that it was there for a wideband lol

[Haltech]

I think the PG's are tapped for an aftermarket WB opposed to a EGT. YOu can find the adapters online as long as you know what NPT your EGT is.

[xcoldricex]

so where's the best place for a second wideband bung if that second one is unusable?

also where's the best place for the EGT? turbo housing? manifold? i didn't think the DP would be a good place...?

[SSinstaller]

Originally Posted by xcoldricex so where's the best place for a second wideband bung if that second one is unusable? also where's the best place for the EGT? turbo housing? manifold? i didn't think the DP would be a good place...?

Innovate reccommends installing the WB O2 at least 18" away from the turbo, but before any flexpipes or couplings that could skew the reading. I have mine installed at the bottom of the DP just past the stock 2nd O2 sensor.

The EGT should be in the runner coming from the leanest cylinder or in the collector of your manifold where it will get an average reading across all the cylinders..

[kingpin748]

EGT - Turbo Manifold

AFR - Some people put them on the DP others put them on the MP.

[xcoldricex]

alright, i'll just go to an exhaust shop and have one welded in near the stock 2nd. then i won't have to worry about a heat shield either. awesome.