2015 Engine differences
 

It looks that the FA20 engine was revised lately. I found the following differences in the 2015 model (manufacture year after July 2014):

valve-intake
valve-exhaust
camshaft sprocket
camshaft complete-intake (left, right)
camshaft complete-exhaust (left, right)
head and valve set-cylinder

Actually, they have different part numbers. Even the entire engine assembly has a different part number.

Any ideas why they made these changes? Any known issue?

To allow for more boost. They switched to forged internals

Could be as simple as a supplier change or as advanced as a correction for a known issue or anything in between. Unfortunately we will not likely ever get a true answer to that question (there will be loads of speculation that people think is true though)
At work we can have a different part number on a part because the coating thickness spec changed by 2 microns.

I was thinking that it might be a supplier change. However, I find it very unlikely to change the supplier only for some specific parts. It sounds quite risky. Besides, don't they manufacture the engine by themselves?

Did you make some kind of comparison between old and new parts?

Suppliers change all the time in the auto industry. Come in with a part that is 1/2 a cent cheaper or can be supplied in a more timely manner then the current one and the business is yours. No risk really as the parts still have to meet all the specs and it doesn't matter if XXX or YYY actually makes them.
"Manufacture" is a bit of a misnomer when it comes to engines (or any assembled module for that matter) as they really just take the parts from many, many suppliers and assemble them. I don't know for sure but seriously doubt that the actually "make" many of the parts in the engine them selves.

http://www.memegen.com/m/jexx28.jpg

I don't get this "sarcasm" picture. If someone could compare the two parts (old vs. new) maybe we could tell what is the difference. It is not rocket science. It has been done before by comparing for example FA20 and FA20DIT parts. Maybe you don't care, but there are others who are interested to know.

The guy was being sarcastic.

The FA20 is not being boosted from the factory. Most likely new part numbers were necessitated due to a change in supplier status (either new factory, or redesign, or simply internal paperwork change).

This happens A LOT. Don't read into it too much.

-alex

The old parts were prone to catastrophic failure.

Basically if you bought a 2012-2014 GT86 you are ****ed.

THAT'S how you do it. :-)

^^ Ya this! The sarcasm pic wasn't directed at you but was intended to clue you in on what Raven said. Sorry if it confused you.

Parts you describe maybe are fitting to new regulations both in Europe and for US for emissions.
Here in Europe regulations set to Euro6 from mid2014. California rules are more restrictive starting up 2016.
head and valve set-cylinder let me think near emissions rather than adding performance.
Maybe useful to see if MY2015 US emissions are the same or not of previous production

I'm pretty curious how these new internals will preform compared to the old internals. It would be great it the newer internals will handle and perform better than pervious. With all the engine issues from the first release an engine overhaul is due. No one likes a blown or ceased engine lol! ;D

not trying to be a word nazi or anything...
 

But I think the word you were looking for was seized, not ceased...

Jaden