Quick question, does anyone know if a polished plenium would increase heat soak in a g35 coupe. I have one I purchased from the forums but never installed it because Tuner said it would decrease the cars performance?

Any one running polished Plenium? Heat soak? Power loss?

Any input guys thanks.

 

I haven't noticed any loss of performance or heat soak issues in the 15 months or so of running one. Not sure how polishing the exterior of your plenum would cause issues. It makes it shiny, but doesn't change the composition of the metal.

I also went from a stilled z tub to a berk polished z tube and noticed no loss of power after that swap either.

 

Thanks Ronnie I bought one from Sean on the forums and when I had my g35 tuned from [ J Tune] they mentioned the performance loss

I want to install the plenum and the nwp throttle body

 

Sean did the polish on mine also. New bumper looks great too btw.

 

Thanks I need a new intercooler make the space between look a little cleaner

I'm patiently waiting for my akebono calipers

 

Could your tuner maybe have thought you meant the inside of the plenum was polished? Cuz that can cause performance loss if you over-polish the inside of the plenum. Not from heat soak tho.

 

I've heard it does cause things to stay hotter longer. But we get heat soak already. I'm going TT and have this and everything else polished. So unless you're running crazy setups I wouldn't worry about it.

 

I'm guessing the tuner believes that it is due to radiant energy properties. Their theory is that the polished metal absorbs heat from the engine by conduction, but it won't release it through radiation. Think about the old classic cars with chrome trim. Ever get a burn from touching the chrome on a hot sunny summer day? Chrome reflects the suns energy, sure; but the chromed metal absorbs the heat from the adjacent painted metal, but can't radiate it away like the car body can. So it just keeps absorbing and gets hotter and hotter....

 

I suppose the tiny ridges on an unpolished plenum could act as heat dissipating fins (think air cooled motorcycle motor), but I can't imagine it making THAT big of a difference. Plus if you have a plenum spacer with aramid gasket, you're ahead of the game on a cooler plenum anyway.

 

Thanks for the input guys I will install the Plenium and do some other breather mods thinking of the NWP throttle with either the Stillen High Flow Intake JWT pop or 3.5 inch furookie