I am interested in wrapping my exhaust after Turbo to reduce engine bay and tranny temps. I see Summit Racing offers Fiberglass composite, Titanium, Copper Coated, and probably a bunch more materials are available. Which is the best and which ones to avoid? Also; on a 3" exhaust pipe how many feet of 2" wrap does it take to cover a foot of exhaust pipe? And finally, never using this stuff before, how is it secured at the end of the wrap?

 

I used regular stuff by DEI and the silicon spray. I heard the titanium stuff falls apart. Look on their site for the math on how to determine how much you need, they only recommend 1/4" overlap. Secure the ends with stainless zip ties or hose clamps.

 

3.1416 x Radius squared for length needed to wrap each circumference, then take the width of the wrap to divide the total length needed to wrap to estimate total length needed.

Example for 3" OD pipe:
3.1416 x 3.0"=9.4248" for each turn of wrap.

Consider in the overlap of each wrap when calculating your length per foot of pipe to be wrapped. You may have two wraps at the start and end or the pipe for coverage and to anchor the wrap properly.

2" wide wrap for each foot with 1/4"overlap calculated in would be about 6.86 wraps per foot, then add in that extra wrap to the total length of pipe needed to be wrapped so for just one foot of 3" pipe with an extra wrap at each end you would need 83.5" of wrap.

Just estimating here but its all in how consistently you overlap those wraps. Exact overlap of a 1/4" is tough to do with bends and kinks in the pipes being wrapped.

 

downpipe will be easier too do than say a set of headers...I have the DEI Titanium stuff and as stated above it is tricky to get right since it likes to fray. However patience and an extra set of hands to help makes it pretty manageable. For the price I would get a 100ft roll and if you have excess then it will come in handy down the road I am sure. Also on the ties...the ones from DEI work, but can be a PITA I suggest a clean looking hose clamp clocked in the right position so you cant see the screw. You can do whatever, but that is just my opinion.

 

Second on using hose clamps, the supplied straps can come off or loosen. at least the older ones I had used in the past.

 

I had that titanium stuff and it burned to a crisp and came apart and got fiberglass everywhere but I think that was mostly due to improper application. I paid someone to do it the first time and it was done incorrectly IMO.
Second time around I used industrial wrap, soaked it, applied it, dried it, sprayed it and heat cycled it. Also double and in some cases triple wrapped it doing each step along the way. Haven't pushed it too much since the new wrap job so I'm not sure how well it will hold up but I think it will work alot better than the last wrap job I had.
Make sure you tuck the ends so that they won't fray.

 

I folded my ends under and wrapped over them, that seemed to work for me, and I havent had any fraying or anything yet. I have mine wrapped pretty tight too though with a pretty good overlap so that might have something to do with it.

 

I Bought a 2" x 100' roll of DEI exhaust wrap from summit and it made it from the manifold flanges all the way back to the sts turbo with 1/4" over lap and i still had about a 1/4 of the roll left if that helps any..

 

It can go a long way, but i wrapped mine tight to get as much of a thermal barrier as possible. either way even if you have a little extra in the end it is handy to have laying around, and not to mention it is better to have more than you need than to get wrapping and come up short.

 

Fiberglass stuff works fine. And like others said hose clamps for the ends.
Cheap easy to use and looks good when done.
I recommend wearing gloves.