[9mmkungfu]

As the subject line says, I'm considering having the down pipe (Jess's) ceramic coated but wanted to see what you all think.

I'm wondering if this will show any appreciable gains as far as possibly lowering EGTs.

Thoughts?

[2deerwhistlers]

Save your money for hybrid turbos and transmission work

[einbruch10]

I dont think youll see any crazy results. it will be good for heat soak in the engine compartment and will lengthen the life of your turbos by a very minimal amount. not to mention it looks awesome lol.

[9mmkungfu]

Originally Posted by 2deerwhistlers

Save your money for hybrid turbos and transmission work

Hehe, as long as those will just be "upgrades" and not necessary replacements, I'm okay with that!!

Originally Posted by einbruch10

I dont think youll see any crazy results. it will be good for heat soak in the engine compartment and will lengthen the life of your turbos by a very minimal amount. not to mention it looks awesome lol.

It would probably be a total cost of around $50-75. If there's zero gain, I'd rather not waste it, but it's a small price to pay if it will lower EGTs by a hundred degrees or so.

[einbruch10]

I'm still relatively new to the n54/n55/n57 etc. world so I'm not sure how hits these things can actually get in WOT situations. But if it's coated properly it's a good possibility to lower EGT's that much. Try using copper exhaust gaskets too, for some reason I think grimmspeed did an experiment and they worked a lot better than traditional ones (holding pressure and dissipating heat)

[einbruch10]

i tryed to find the study but failed .... but again when speaking of thermal effeciency getting your downpipe(s) ceramic coated is a good idea regardless. your exhaust will flow better due to heated gasses traveling faster and keeping overall engine (and engine bay) temps down is always beneficial. on another note where are you getting this work done for that cheap? i would be coating my kitchen ware at that cost lol.

[iaknown]

Don't waste your money. May lower underhood temps a little but it won't help anything flow better. These cars already have an vastly oversize downpipe for the amount of flow they need....

[2deerwhistlers]

Originally Posted by iaknown

Don't waste your money. May lower underhood temps a little but it won't help anything flow better. These cars already have an vastly oversize downpipe for the amount of flow they need....

'vastly oversized'

[iaknown]

Originally Posted by 2deerwhistlers

'vastly oversized'

OK, OK. If its Jess's downpipe it is perfectly sized....better? "Vastly oversized" is never a bad thing post turbo....

But he did ask about gains, and there won't be any flow gains from any coating on this application....

[DWR]

Originally Posted by 9mmkungfu

but it's a small price to pay if it will lower EGTs by a hundred degrees or so.

Well, it won't lower EGT because it helps keep the heat in.

[iaknown]

Originally Posted by DWR

Well, it won't lower EGT because it helps keep the heat in.

If anything it'll raise EGT's because the sensor will read higher

[DSB335d]

Check out Swain Tech White Lightning exhaust coating.

[9mmkungfu]

Originally Posted by DWR

Well, it won't lower EGT because it helps keep the heat in.

Edited to add: I found this from another diesel site that I'm on.

"If you were to ceramic coat your exhaust manifolds, turbine housing and down pipe, you'll generally see reduced EGTs, sooner spool up and an overall bump in performance. The cliff notes explanation of the process improvement is that hot exhaust air travels at a higher velocity than cooler, as a result scavenging is improved and turbo velocities are increased. The “perfect”, most efficient engine would be able to generate enormous amounts of heat in the cylinder without transferring this heat through the head or piston, then that hot air would go through your exhaust or turbo system again without dissipating through any of it and exiting the tail pipe as hot and quickly as possible."

Granted, this was a quote from a shop that does ceramic coatings I guess this question isn't really limited to 335ds or even diesels for that matter, but figured I'd post it up here since we have a tech-savvy group on this forum.