the velocity maintained from keep the the diameter of the gases smaller is due to venturi effect, not anything to do with temperature, just to make that clear.

if you're saying that the gases stay hotter becasue there is less surface area for the gases to radiate heat, that is true but the difference between the surface areas of two different cylinders varies only linearly in relation to the radius of the cylinder's circular part. you'd see more dramatic differences in a geometry like a sphere.

coating is different than wrapping, coating the insides will help keep yer stuff alive for longer, resist corrosion etc. just wrapping might speed up the processes of corrosion etc... but for something like a dp if it's made in stainless, you might not see corrosive effects for QUITE some time... not something to worry about.

 

but my only concern is the turbo itself, the rest of the exhaust is inexpensive to replace, plus it has much less chance of failure (no moving parts or complexities). So your saying for example that coating the interior of the turbo is good for it's lifespan.. now I agree with that, but coating anything BEFORE the turbo only increases the amt of heat that reaches the turbo, hence the more extreme the heat cycles will be for it.

 

its good idea to buy extra stock turbo. thats what i did
paid like $250 something. just for peace of mind

 

uhm... isn't that why people get the hot side coated too? i know it's more cost... but that's why people do it right? coat everything... that's why the ams kit comes that way right?

 

well yea, like i said, coating TURBO components=good (less heat absorbed into oil/metal); so yea, to as much of the TURBO as possible should be a good Idea. However, to coat anything BEFORE the turbo would result in more heat making its way TO the turbo, and that = bad.

 

How much more heat is it?
Can the turbo handle the additional heat because it is only x amount of degrees more?

You can't qauntify the statement that more heat at the turbo is bad unless you know how much and the operating range of the turbo now. Ever see a hotside glow with no coatings on it? It's not that hard to do actually and therefore does the whole too much heat arguement hold any water if I can take my car out and get the hotside cherry red? Plenty have done it to theirs and they are still working fine.

My point is I think a lot of people are making a big deal over the coatings. This is a performance car and therefore nothing lasts forever. It sounds like you already decided against it and to be honest why bother if you are not porting it. Going through all the dis and assem. for coating? Not worth the trouble.
If your porting it then yes it would be worth the trouble. Remever the added costs such as gaskets, etc which is probably over $100 additional.

 

gasket,stainless bolts,etc ---> where u get it from ? dealer?

 

Dealer
Oil pan turbo tube gasket.
manifold to head gasket.
needed a new donut

stainless studs from lancershop.

I reused the Metal turbo gaskets (manifold and O2 housing) because mine are low mileage.
I made aluminum gaskets for downpipe to cat and cat to catback. Hope they work, it was the wrong type of aluminum so we couldn't soften it like I would have liked.

 

im personally doing it for 3 reasons...

1.the additional heat that will travel down to the turbo will be minimal considering the heat in the turbo is already up there.... and since i have stock turbo, i dont think my radiator or my IC is max out yet, plenty of cooling margin which will mean insignificant temp increase overall... BUT the reduction of engine bay WILL be quickly felt. in addition to the slight increase in HP gain, it will increase the life of the electrical wiring and other parts from over exposure to heat (starter, battery, wires etc)...

2.coating the manifold also means heat is being pushed further down, which increases the scavenging effect and spool up will increase a notch.

3.i hate seeing a rusted manifold in my super clean engine bay, i cant stand it.

so in conclusion, coating the manifold will not give you any big gains im a guy who loves improving my car without strapping a turbo or a rocket in the back

 

is porting & coating on stock turbo housing a good idea or just do manifold & o2 housing?

 

???

 

We port and coat all of the parts, manifold, turbine housing and 02 housing. If you are only going to do one piece or do it one piece at a time treat it like an exhaust system and start at the back. So 02 housing first, then turbine then manifold.

David Buschur
www.buschurracing.com

 

David,
Unless something has changed I don't see the housing on your website. Do you have 10.5 available to go with the manifold and O2 or are you just porting the 9.8 housings?
I may be pulling mine apart again to do head work since it is half apart for springs and retainers now and may want to do the housing while I am at it.

Thanks

 

I just saw your response in the other thread on the 10.5 housing. IS there a price on the porting of either the 9.8 or 10.5 if it is customer supplied in advance?

Edit. Sorry I found the answer on the site, I was looking in the wrong place.

 

brother, I started out saying from the first post that I was getting it ported. (there are obvious gains there... David guessed about 12whp)
Secondly, just because I can't quantify the amt of heat going to the turbo, doesn't mean its not bad. Yes there are those who get the hotside red hot, but is THAT good? no. If everyone says that this coating makes their underhood temps amazingly low, then where does all that heat go? answer: through the turbo, so no I don't know how much exactly, but I do know that with something that is already getting nearly 12-1300 degrees, a few hundred more isn't a good thing, considering that the saftey factor counted in by the design engineers likely did not count in that temp. And yea you could use the arguement that it is a perfomance car and nothing will last, but is that relivant? should I drive it like an idiot b/c its not gonna last anyways? no.
And lastly it only seems that I have decided against it because if you read the responses from me and others, it has been my informed decision as a result of the helpful people posting here to decide against it... does that mean to you that I should stop responding if I made up my mind? That is why I started the thread... to help in the decision.