Jet hot coating to improve performance
 

If you jet hot coat different parts under the hood would that improve performance?

Im talking about coating the downpipe, turbo exhaust housing, turbo manifold, uim, lim, tb, elbow, intercooler pipes.

Would any of that help? Because what I'm thinking is by coating the exhaust parts it would keep the heat from getting out of the exhaust into the engine bay and by coating the intercooler pipes and uim and the rest it would keep the heat from getting in and keep temp cooler.

Would this work??

I'm not sure about the jet hot, but from what I've heard, insulating the downpipe does help keep engine compartment heat down.

just wrap the dp with header wrap adn its all good, i wrap mines with about 8 layers and i can grab it with my bare hands after a run :)

yeah but then what about the turbo exhaust housing (compressor housing??) and the uim and other parts. I want the most you can get.

If not jet hot then what. I want to keep the exhaust heat out of the engine bay and the engine bay heat out of the whole intake pieces.

A friend of mine getting a custom turbo exhaust manifold was told by the shop "If you coat it, your turbo may spool almost 500rpms faster"

I have my UIM coated, and it DID make a differance. Butt dyno immediately noticed the improved turbo response.

coating is not limited to supressing temps on the ebay..
it also aids in increasing exhaust flow and provides resistance to corrosion..
header wraps does not provide for dissapation of heat and can cause heat stress on the piping..
pending on the material makeup.. it may also aid in corrosion..
imho.. coating provides most of its advantages on the exhaust side...

ok so you are saying that on the dp, turbo manifold and hot side of the turbo it will help. But if it keeps the heat from getting out into the engine bay will it keep the heat from getting in on the intake side? Like from the intercooler all the way untill it enters the engine.

any heat diverted away from the intake is a plus..

I have my hot side coated... and the DP is getting it as well.. :)

how much would this help out tho?

I am mainly concerned about hot days, which we have alot of here in Florida.

I don't think the outside temperature will have much impact on the effectiveness on the coating... I could be wrong though..

It should keep more heat IN the exhaust which would be a good thing.. :D

anyone know where i can get stuff coated around here?

so coating the exhaust will reduce underhood temps that much so that the intake system wont be soaking in hot air?

maybe I should draw a diagram to expain what I am thinking better.

o well no time for that now.

For any exhaust-related components, these coatings are a definite plus. On the intake side, however, I wonder about this dilemma: parts like the UIM, LIM, throttle body, etc., are either directly connected to or sitting directly atop high heat radiating areas of the engine. You can thermal barrier them with a coating, but once that metal part absorbs enough heat (which it will eventually, and probably a lot quicker than you think to a level that can affect intake temps), you will end up compounding that heat since the part cannot dissipate any heat it absorbs due to the coating.

i think coating both intake manifolds inside and out would help a good bit with intake temps. rallimike has done it and combined with his rad setup he's seeing good results.

I have my DP wrapped and my twins are fully NS. In 5th gear @2500 rpm and full throttle, i now get an immediate 5lbs of boost....before the wrap i was still spooling. And in 2nd at ~2k, it will build boost. :) I def think it helps turbo response.

Yeah, I'm wondering about this too. Its basically an oven in the engine bay and I'm just not sure if coating the intake side will do anything given that the main heat generating parts will still create the heat.

I believe BNR does coat the turbo manifold. Other aftermarket manifolds are also coated. Not all, but some are.

I don't think the coating will affect heat dissipation, but I could be wrong. Not an engineer....

I spoke with Rallimike also. It seems like it may help a bit. I'm not fully convinced, but the price of having the UIM and LIM jet-hotted is cheaper than polishing. I think I will have it done.

Any others with more engineering experience wanna comment?

"On the intake side, however, I wonder about this dilemma: parts like the UIM, LIM, throttle body, etc., are either directly connected to or sitting directly atop high heat radiating areas of the engine. You can thermal barrier them with a coating, but once that metal part absorbs enough heat (which it will eventually, and probably a lot quicker than you think to a level that can affect intake temps), you will end up compounding that heat since the part cannot dissipate any heat it absorbs due to the coating."
I thought about this too, before having the intakes coated. My results have been less heat soak and much quicker cool down of intake temps. I don't have a scientific explanation...maybe the air moving through the intake cools the manifold faster with the insulation?

Problem is, I did (almost) everything I could do to reduce intake temps, all at the same time. Remove the radiator from engine bay, phenolic spacer between the UIM and LIM, and the ceramic coating of UIM & LIM. (Prior to this, I had the DP and Turbo coated, without significant results.) So it is impossible to know the benefits of each item individually.

Yep, that is the problem Mike - knowing the individual benefits. I think I still prefer the jet-hot to polishing though just in case. I think I might try it in a couple of weeks depending on how the rest of this thread goes.

All of the [arts u mentioned are coated in my FD and YES, I do notice that engine hood temps have dropped from opening the hood.

Batman or whom ever else......when you coated all the items (UIM to the DP), did you have just the out side done, or was the inside coated as well??

in and out.

inside will smooth out the orange peel for less turbulence........

Which coating did you use for the throttle body? And how did you keep it from causing clearance problems with the throttle plates?