Quote:
Originally Posted by Tor
A is probably cylinder 1 according to RomRaider. B is 2 or 3? If 2, those would both be the best cooled cylinders facing the front of the engine? If 3, could the right side run hotter maybe (exhaust cat below)?
Could it rather be because of flow in the stock header? In which case, the compensations may not make any sense with an aftermarket header? Are there any changes to these tables in the MY17 with the revised header/intake?
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Have you considered differences in fueling between cylinders due to unequal airflow? Heat management as cylinders will always run different temps within the block? Then you have all the external factors that you mentioned.
AFAIK cylinders A-D are 1-4 in firing order.
I would expect that the changes in the MY17 are more to do with the intake manifold than exhaust manifold, but there are also internal changes in the block that may also have an impact.