I am looking for a more effect means of insulation my exhaust pipes than merely using fiberglass lagging.

Anyone know roughly what the temperature of the exhaust gases at the outlet of the exhaust manifolds, inlet to the Y pipe, and inlet to the mid pipe?

I would check myself but I do not have one of those fancy infrared temperature pointers.

 

Are you FI?... I think FI temps are higher then NA?

 

Yeah, I figured that and being that I am STS my temperatures are going to be somewhat different than everyone elses.

I need to find some lagging material that will withstand the heat. On ships, we basically have stone based lagging around the pipes and what looks like turbo blankets on the valves. My thought was to the insulate the exhaust system with the blankets to get the most out of my turbo...

 

Goosegoose got his heat wrap from here http://speedzone24-7.com/exhaust-wrap.htm and he swear that it help him spool better. Downside is that he felt that his exhaust got louder so he got this http://www.magnaflow.com/02product/s...ne=main&id=845 and made a difference on sound (Just sound and no performance benefit).

I'll be putting some heat wrap, TP and Water/Meth this spring.

 

I'm NA, and my headers are also wrapped. I don't have an EGT sensor, so I'm not really sure how hot it actually gets though.

 

NA exhaust is about 760'C at the outlet of the manifold and drops to about 450'C at the inlet of the Y pipe.

The measured temperature drop occured through 2.25" unresonated test pipes with no heat wrap.

Its a very large and rapid temperature drop over a very short distance.

 

Did you happen to measure at the outlet of the OEM cats instead of test pipes? It would be significantly higher I suspect?

 

No measurement on stock cats. And no measurements (yet) on the Motordyne cats.

But it's the reason for EGT measurements.

 

Yeah, that seems like it would help some and I know it would work but what I am talking about is this type approach.




My nismo mid pipe has a glass pack type resonator on it and it is damn loud. Really, too loud because my buddy could hear me over 2 miles away at WOT. My car makes a Greddy TT sound quiet.

Thanks Hydra for those numbers. I knew it was going to be pretty high. Prolly some what higher with FI.

 

You know, I was talking to Sam@GTM about EGT's on my car and apparently, its not really all that much different when FI.

In any case, just stay below 900'C.

 

Damn!!! If you go that route then let us know what you come up with... Does that work well with moisture?

 

Marine environment is about as harsh as it gets. When a gasket leaks we take the blanket off and the difference is night and day. Pretty crazy how much it actually does insulate.


Pretty interesting.

 

If I had the STS kit I'd probably get everything before the turbo jet-hot coated.

And if possible, I'd get thin fins installed lenghwise along the intake charge pipe, similar to an intercooler. fins actually can make a measureable difference ... increases the surface area of heat dissipation dramatically

 

my temps measured pre-stock cats with my greddy TT ranged from
900-1000F when cruising & up to 1400F when I get on it...

 

probably because they run it rich which gives you some evaporative cooling

 

also most header wrap will deteriorate quickly if installed anywhere but inside the engine compartment. Water really eats the stuff up, even when properly sprayed with silicon sealant. I too would connsider jet hot or nothing....

 

Right on. 1400'F = exactly 760'C

 

I am not sure about the center charge air pipe but the charge air pipe which runs along the side, there is not enough clearance for fins.

Jet-hot coated would certainly be the easiest. The charge air pipes are all jet-hot coated.

 

Will Jet-Hot coating better than Heat Wrap in term of keeping all the heat inside the exhaust pipe? With STS I think the #1 is keeping the exhaust hot to keep velocity and in my case (Or who ever have the new STS Piping) to keep the Charge Pipe from heating up coz it is right next to the exhaust.

 

Wrap will work a lot better.