03 350z with eagle rods and cp or wiseco pistons for a powerlab turbo kit, is it worth having the pistons coated on the tops or skirts? What do you recomend or dont recomend? thanks

 

What is your intended application? For your average street car, not necessary. For your salt-flat racer, etc - yes.

 

Aren't both for completely different reasons? Ceramic for heat and Moly for reduced friction?

 

I've been wondering about this too.

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The moly coating reduces friction a bit.

The ceramic coating is supposed to help mitigate hot spots from forming on the top of the piston, thereby staving off detonation a little longer.

I spoke directly with an Engineer at Wiseco and he did recommend the coatings on the pistons for those who want to get every last bit of hp out of their motor. If you will not be pushing your motor really hard, it is probably not necessary.

One piece of evidence that I can throw out is that my particular motor, which had the coatings (PolyDyne), put down more hp on pump gas on Japtrix's Mustang dyno than any other VQ35DE they had dyno'd. I have alot of other upgrades on my build, but every little bit helps.

 

I've heard that the moly coating eventually burns off from the pistons after a certain amount of driving...is this true?

And is it the same case for the ceramic coating?

 

Yes, I believe that the moly coating does wear. I don't know at what rate it wears though.

I have not heard of the ceramic coating wearing, but it may, I just don't know.

 

ceramic is not going to burn off, it's much more heat resistant than aluminum or steel is. your motor will melt in to slag before ceramic burns off.

 

the coating also allows a tighter piston to bore clearance I believe. longer break in but a quiter engine in the long run