Exhaust temps at cat

[beat90tsi]

Does anyone know their exhaust temps at the cat/test-pipe section?
I guess I could measure it with a normal EGT probe, but I'd also like to measure the temp of the piping, not just the gas.
Anyone have any suggestions?

 

[mavisky]

I highly doubt anyone outside of the oems have measured exhaust temperatures at the test pipe/cat area. Are you trying to do this because you're scared to tap the exhaust manifold or something?

 

[beat90tsi]

Are you trying to do this because you're scared to tap the exhaust manifold or something?

No, maybe if you read my whole post you'd see that I'm more concerned with finding out how hot the metal gets. However we all know what a big strong man you are, and how big your balls are for drilling and tapping your own manifold, unlike the rest of us sissies, congratulations sir.

 

[mavisky]

No, maybe if you read my whole post you'd see that I'm more concerned with finding out how hot the metal gets. However we all know what a big strong man you are, and how big your balls are for drilling and tapping your own manifold, unlike the rest of us sissies, congratulations sir.

Hey ease the hell up man, it's about time you pulled that stick out of your tailpipe. If you ever want to be taken seriously and provided with any information on this site you'd better learn to respect others, especially moderators or you won't even be around for long. Now back to your question where you said, and I quote, "Does anyone know their exhaust temps at the cat/test-pipe section?".

By the time your exhaust gets back to the test pipe you're going to be behind the curve and even the fastest responding probes won't give you much info as the air will be awfully cold by then and not to mention it won't directly correlate to the rpms on your tach as that air came from the head awhile ago. I don't think anyone makes a probe for testing the temperature of the actual metal, I think they would if this provided any sort of generally useful info. You will most likely have to get a pyrometer and either find someway to attach it to the piping without it getting damaged, falling off, and still getting a good reading.

Seriously though man, take it easy of the defensive bull5hit or you'll be gone from this site with the quickness.

 

[beat90tsi]

Yeah, I guess I did fly off the handle a little there. I'm just sick of the know it all attitude of all the moderators, not just you.

I asked a fairly benign question, and you assumed I was "scared to tap my manifold." That shit gets old.

 

[mavisky]

Yeah, I guess I did fly off the handle a little there. I'm just sick of the know it all attitude of all the moderators, not just you.

I asked a fairly benign question, and you assumed I was "scared to tap my manifold." That shit gets old.

If you would've let me and everyone else know why you're wanting to know the temperature of this area we could probably help you out more. If you haven't noticed I'm the only one who's even tried to help you here at all. When you don't tell us what you're trying to accomplish, or why you're taking a certain route, then we all have to assume things in order to help you.

As far as the "flying off the handle" it wasn't too long ago a certain someone posted these words.

I agree that those who have more knowledge should be more tolerant of the rookies than they often are. But at the same time, it is pretty clear to me that a lot of rookies have a bad attitude, and think they know everything already.

Young and/or inexperienced people that are trying to learn should be respectful and receptive, not cocky and argumentative.

 

[beat90tsi]

Good call looking at my history.

I don't think I'm a rookie at this point, but I'll admit I have been a little argumentative.

It seems that no one has bothered to measure temps at the test-pipe, and I can accept that.

I was just pissed about the "are you scared to tap your manifold" bit.

 

[Defiant]

Does anyone know their exhaust temps at the cat/test-pipe section?

It'll wander depending on load and other usual factors. It might get up to 500°F at times, I'd be very surprised if it would hold that for long if it got to it.

I guess I could measure it with a normal EGT probe, but I'd also like to measure the temp of the piping, not just the gas.
Anyone have any suggestions?

Point an infra-red thermometer gun at it. They're down to fifty bucks.

Please be nice to the Moderators.

 

[slugsgomoo]

It'll wander depending on load and other usual factors. It might get up to 500°F at times, I'd be very surprised if it would hold that for long if it got to it.
Point an infra-red thermometer gun at it. They're down to fifty bucks.

Please be nice to the Moderators.

unfortunately infared measuring guns don't give a very accurate reading off of things that are shiny and have low emissitivity (sp?). They'll give you an idea that you can compare against something else, but I wouldn't take it as gospel.

Also, a the area ahead of a cat will be pretty hot, but the cat can get VERY hot. I have seen converters get to the "glowing red" stage after a long drive on the freeway, especially on cars that are tuned as ridiculously rich as ours from the factory. The idea is to BURN UP hydrocarbons & whatnot. On my toyota, if i drive more than about 100mi in a stretch, I can actually feel the heat come up through the car (not badly, but noticeable). Cat's get hot.

 

[cb3016]

rent a laser thermometer from kragen or autozone and find out

 

[Maglin]

If I remember correct a CAT will get as hot as 1200* F when it's operating properly. They will be self sustaining once they reach a temp of 600*F. But that doesn't corespond to what I tested a few days ago for some emissions BS at work. Front cat was 650* and the rear cat didn't work anymore and was only at 350*. The inlet of the CAT was 100* cooler than the outlet. This is on a car with 70K miles. I don't know if that is what your looking for. If it's for placement for a WB O2 just under the firewall is a perfect location as it will never get hot enough to cause the sensor to overheat. You still haven't answered why you want to know.

 

[Defiant]

I think the question was for a replacement section, not the cataclysmic diverter. Might be wrong.
Yes, we get plenty of forest fires from cats parking over dry grass out here. It's not as much a hazard with just an exhaust system.