I'm kind of embarrassed to tell what I did but it seems (i.e., no measurements) to work pretty well at keeping the underhood temp down. I had to use a '87 Y-pipe in my '88. An '88 Y-pipe includes a heatshield/wrap, so I wanted to put something on the '87 pipe. I wrappped the Y-pipe in plain fiberglass pipe wrap (no backing or adhesive) and then slit an aluminum dryer vent tube (the accordian-style) lengthwise and covered the wrapped Y-pipe with that (pause for chuckling). I stripped some old Romex wiring (house wiring stuff) and used the thick copper strands to hold the whole thing in place. I thought it looked pretty decent but I showed it to another car guy and he said, "Hey, that looks like a dryer vent." Kinda burst my bubble but it really doesn't look bad and it does keep the heat down and it only cost about $10. I think claiming any increased performance would be a stretch. It smelled slightly for 150 miles or so but not at all after that. Good luck.
I wrapped my manifolds and the Y pipe! With regaurds to HP gains I don't think that it makes a noticeable difference. I know some are going to disagree, but personally I took out almost all the heat shields and just wrapped the manifolds and the Y pipe. In doing so I noticed the engine compartment was a little cooler than it was stock, but I am guessing if you leave the heat shields in it would be much cooler. I would say buy the stuff if you want a cooler engine compartment, but not if you only want more HP, because it just doesn't make that much power difference. As for dyno results and stuff, I can't help you there. I'm just telling you my opinion.
I highly doubt that there will be any gain with a ceramic coating, in fact the wraps do a better job at keeping the heat down, so id expect a better gain from the wraps (which is none) However ceramic coatings are really nice and wont rot your pipes if they arent stainless (not a prob in the fiero)
I have my pipes wraped on the fiero and totally scraped all the heat shields in the engine bay, and i can say it is much cooler in there than stock.
Keep in mind that an upgrade in exhaust for the fiero might get you 10-15hp if you get tuned headers and a 2.5" system to the tips... so it would be my guess that there would be no measureable performance difference. But it looks cool and keeps temps way down.
Posts: 2772 From: Jacksonville, Fl- usa Registered: Aug 2001
just my 2cents I have an 86 GT with a 95 3.4 pushrod the engine bay insulation has been removed and the manifolds and y pipe are all neatly wrapped---this is the coolest running Fiero that I have had to date. prior cars were an 85se v-6 stock, and an 88 2.5 stock.
See if a local heating/cooling supply company has any steam pipe wrap. It is about 2 inches wide and made of a woven, heat resistant material which looks a lot like the ThermoTec type header wrap. A friend of mine gave me a huge roll of it a while back and it worked just as well as the stuff I had ordered from Jeg's and Summit.
Oct 2nd, 2003
Posts: 952 From: Edmonton, Alberta, Canada Registered: Nov 2002
I have my headers and Y pipe wrapped. I can't testify for sure what the exact increase in HP is since I have never dynoed my car. I can tell you that my car runs very cool with the stock 195 thermostat and 230 fan switch. The fan doesn't come on nearly as much even in this past summer's 100 deg+ temps. On the highway at 80 mph the engine temp stayed at 190-200 and the fan never came on.