Need some feedback on exhaust temps....

Steve, I assume those are in deg. C?? Sounds low...I posted IR temps here in a thread or two, seem to recall OEM headers with heat shields being more like 550F +. If I ever get my car back on the road I'll be studying differences between OEM and my coated Fabspeed headers...

Wait a minute, how are your exhaust tip temps so much higher than headers?? That seems a bit strange, even with the heat shields.

 

My infrared thermometer reads about 550-600 on the oem header shields as well, like UConn Huskie's, maybe you have a bad IR gun? Those disparities seem way out of whack. Considering the price of these things, they're probably assembled by 6-year olds in a third world country.

Oh yeah, $25 for a smog test? You have it sweet in NV, we pay about $80 here in Cali, AND we don't get to have assault rifles... lame

good luck with the 355!

 

http://www.ferrarichat.com/forum/showthread.php?t=159377&highlight=exhaust+temps

Here's the temps I recorded, posted in a previous thread that went nowhere...I think this is interesting stuff, post up more temps! Especially you Fabspeed header guys, with or without coating.

Edit: Here's the post to save you guys a click:

I've been casually taking some temp readings on my car. Of course the best I can do with a handheld IR gun is to stop, pop the engine cover, then take some readings. Here's some 'average' temps I've seen:

Heat shield covering OEM exhaust manifold: 650F
Exhaust tips: 240F
Heat shield covering Tubi: 160F
Oil filter: 215F

Also should note I have the challenge grille which may cool things off a little. The right way to do it is in real time with thermocouples and a laptop, but that's getting a bit more complicated. I would expect aftermarket headers would read much hotter just because they're not covered by a heat shield (as I understand it). So a good measure may be exhaust tip temps - the cooler those are means more heat escaped in the engine bay. I think the real goal is to get as much exhaust heat out through the tailpipes as possible (within limits of course, I don't know if too much insulation could overheat the cats?)

 

Did the test station realize they were supposed to have the car running??

The Infrared units have a hard time taking a reading on any surface with a "shine". Try on a rusty seam of the converter up close.

Dave

 

Rust? I guess I'm not getting good readings, no rust on any of my exhaust..

 

Unless you have a fancy one that can change emissivity

 

Just poking fun at the readings. What is coming out the tailpipe is cleaner than the ambiant air in the testing facility, that I assure you.

Dave

 

Rust was a poor choice of words. Oxidized perhaps? The Infrared pyrometers will not, as mentioned above, give accurate feedback when used on reflective surfaces.

With all of the stainless used on the Ferrari exhaust systems a touch type pyrometer is required. I tried to get a reading on a set of F40 Hyperflow test pipes and it was impossible with my infrared unit.

The clearance of the header tubes to the heat shield and the amount of fiberglass insulation at any given area is very inconsistent. Testing each tube just before the heatshield with a touch type pyrometer will give some meaningful readings and help with the diagnostics. Pre-cat HC and CO readings will fill in any missing data.

From what I see I wouldnt be too concerned. Your readings on the Cats doesnt look too far off the mark considering the testing method.

Dave

 

BWAAAAA Ha ha!

 

Nope, everything gets mixed up in the muffler either way. The readings are simply a result of a properly running engine in a good state of tune. Damn fine package these are!

Dave

 

Been a long time since I took Heat Transfer (going on 4 decades). So I don't remember a lot about how sensitive emissivity can be. But I'm wondering if it may be easy to just wrap headers in the dull side of some aluminum foil to help with emissivity. Or perhaps use a strip of painted or lightly blasted 22 gauge rolled and clamped tightly to the pipes. May not be worth the effort in many cases, but maybe something like that would avoid having to purchase a contact pyrometer.