FiftyOne Bronze Donating Members 1,145 Member For: 11y 7m 25d Gender: Male Posted 14/08/14 12:52 PM Share Posted 14/08/14 12:52 PM (edited) Right up until the cat is so hot it's molten & the core collapses. *yes, I know that would be only under extreme duress however I've heard of many cats collapsing on even NA cars in normal conditions*just sayn Edited 14/08/14 12:52 PM by FiftyOne Link to comment Share on other sites More sharing options...
jimmixr Donating Members 686 Member For: 14y 6m 8d Posted 14/08/14 02:00 PM Share Posted 14/08/14 02:00 PM Theres no way that core will melt because of a wrapped dump. Core melt from excessively rich or over-fuelling ..Were really not talking about retaining hundreds of degrees here.. Link to comment Share on other sites More sharing options...
Joorsh New Member 14 Member For: 17y 5m 1d Gender: Male Posted 15/08/14 03:17 AM Share Posted 15/08/14 03:17 AM I thought it was leaning-out that caused EGT's to spike, not running rich?Either way, cat's do eventually fall apart with age and repeated heat cycling, regardless of the temp they run at. Excessive heat probably isn't going to help the lifespan though. From what I understand they have an optimum operating temperature, so I think hotter is only better up to a point. Car manufacturers use all sorts of tricks to get heat into cats as fast as possible during cold start, but I believe that's just to get them into the temperature "sweet spot". Nuking them probably isn't going to make them run any better, but I may be wrong. 1 Link to comment Share on other sites More sharing options...
Kimberley Scott www.australianflag.org.au Donating Members 6,763 Member For: 19y 7m 10d Gender: Male Location: Brisbane Posted 15/08/14 03:35 AM Share Posted 15/08/14 03:35 AM (edited) Why not put an expansion chamber in just before Cat. Expanding gasses cool. Eg 2.5 inch exhaust, into 4 inch expansion and chamber into 4 inch Cat then then step it down after Cat. Enough nerds in here to expand on my theory. Edited 15/08/14 03:36 AM by Kimberley Scott Link to comment Share on other sites More sharing options...
jimmixr Donating Members 686 Member For: 14y 6m 8d Posted 15/08/14 03:57 AM Share Posted 15/08/14 03:57 AM The larger dump pipe does just that.. acts as an expansion chamber basically Link to comment Share on other sites More sharing options...
Kimberley Scott www.australianflag.org.au Donating Members 6,763 Member For: 19y 7m 10d Gender: Male Location: Brisbane Posted 15/08/14 04:13 AM Share Posted 15/08/14 04:13 AM There you go. Link to comment Share on other sites More sharing options...
FiftyOne Bronze Donating Members 1,145 Member For: 11y 7m 25d Gender: Male Posted 16/08/14 12:05 PM Share Posted 16/08/14 12:05 PM I thought it was leaning-out that caused EGT's to spike, not running rich?Either way, cat's do eventually fall apart with age and repeated heat cycling, regardless of the temp they run at. Excessive heat probably isn't going to help the lifespan though. From what I understand they have an optimum operating temperature, so I think hotter is only better up to a point. Car manufacturers use all sorts of tricks to get heat into cats as fast as possible during cold start, but I believe that's just to get them into the temperature "sweet spot". Nuking them probably isn't going to make them run any better, but I may be wrong.100% correct. re the nuking, higher temps lower the life significantly 1 Link to comment Share on other sites More sharing options...
turbotrana Member 2,586 Member For: 21y 10m 27d Gender: Male Posted 16/08/14 01:09 PM Share Posted 16/08/14 01:09 PM Heat wrapping whilst effective just stuffs the metal that was wrapped up. It will make it brittle and crack. 1 Link to comment Share on other sites More sharing options...
FiftyOne Bronze Donating Members 1,145 Member For: 11y 7m 25d Gender: Male Posted 16/08/14 01:41 PM Share Posted 16/08/14 01:41 PM Not sure how ceramic coat would effect that with the wrap but I could still see if it was wrapped it could crack Link to comment Share on other sites More sharing options...
Bellato Donating Members 2,713 Member For: 14y 4m 7d Posted 25/08/14 08:04 AM Share Posted 25/08/14 08:04 AM What would be the effect of wrapping an entire exhaust? May be buying a full system heat wrapped from dump to last muffler? Going off what people are saying all the heat would be built up in the mufflers (I assume they aren't wrapped) and could stuff them? Link to comment Share on other sites More sharing options...
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