I've got some dei heat wrap layinga round and was wondering if I should wrap my pde (already installed) downpipe in it? Are there any downsides to the wrap, maybe holding moisture and rusting? It seems like everyone is wraping their, er', pipes so why not me, right? I got the newer black DEI stuff if that matters at all.
you may want to coat it first before wrapping especially with all the salt around here in the winter. hope you arent going to be wrapping whiles installed...that would be a major pita.
the cons are that you will need to take the DP off to wrap it, also heat wrap generally absorbs moisture which can become trapped next to the metal. heat + salt + water = rust. if you DP is coated then you should be fine or atleast safer from rust. the pros are that you keep more heat in the exhuast stream. the prevents heat soak from other engine bay parts like the intercooler. IIRC it also helps maintain exhuast velocity which helps spool. I personally had mine coated (grimmspeed) then wrapped it and sprayed it with DEI high temp (2000*F?) silicone.
just for my own satisfaction.. wrap then spray or spray then wrap? I would think it would be spray then wrap but you did yours differently dynapar?
I had the downpipe coated, then i wrapped it and sprayed the silicone over the wrap. the silicone helps prevent water from entering the weave of the wrap. It maybe possible to spray the DP w/ the high temp silicone, but i dont know how long it would last with the wrap rubbing on it constiantly. i can add some pics of what it looks like wrapped, comapred to painted. i may even have a shot of it when it was coated, but prolly not.
Well, one thing to keep in mind, your egt's are around 1500+ degrees, so the wrap won't hold water in it for long (if at all). As for wrapping a dp, that is mainly for keeping underhood temps down. if you are looking for any kinda of performance out of it, wrap everything before the turbo. Russ
pics? Did the welds fail? I'm just gonna wrap the section that is next to the firs wall and not the horizontal section that would potentially hold moisture.
Its not the moisture that makes the pipes fail, it is half ass workmanship (aka cheap parts) that can't hold up to the heat. Once you wrap the pipe is retains so much heat that the metal itself starts to fail. Again, 1500+ degrees and it doesn't cool down when you are driving. Russ
alot of the failures where on ss headers. they cheapo ones that dont have the welds all around the runner ends....just has some shotty short welds on top, bottom, and sides.
