RE: Ceramic coating EM's

[QSHIPQ@aol.com]

A couple of thoughts and btdt on CC....
Given the length of the EM to the turbo, not sure what "increase" in exhaust 
velocity you'd expect, but after btdt, I didn't notice any increase in 
performance (gtech 0-60) with either the 2pc or the ceramic coating (inside) 
of it.  However, the exhaust system was stock on the car I baselined, so 
maybe concurrent exhaust mods necessary.

Regarding the "chunking".  My understanding of CC is that it will degrade 
over time, but we are talking about mils thick, and a half life of probably a 
million miles or more.  "Chunking" might occur with a DIY ceramic 
application, but not a concern.  Talk to the coating places, they know their 
stuff.

Regarding inside v outside.  I'm with Jeff G on this one, inside only.  Doing 
the outside can trap the heat in the manifold, increasing the heat cycle 
delta of an already prone-to-cracking manifold.  

For more on who does what and why, how bout some trivia:  Porsche uses CC on 
it's turbo cars from the factory, but very little of it.  Copy what they do, 
it makes more sense.  

As far as underhood temps.  Some baselining might be nice, remember, ceramic 
coating only moves the heat downstream.  So unless you ceramic coat all the 
way to the cat, underhood heat really hasn't been resolved, just moved.

My .02

Scott Justusson
'87 5ktqwRS2 - 10vt
'84 RS2URQ - 20vt
'87 4Runner turbo