Quote:
Originally Posted by Marrk
Understood.
But I was responding to your original statement: "a factory ECU tuned to almost no margin of error for temp or fuel differences." If the factory is f.-ing up the engineering, then that ain't good.
EDIT: Unless you mean that owners are tuning a factory ECU and making it whack . . . ?
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Basically the factory tune sounds like it is pretty tight. And small user tweaks can have large negative consequences. In the old days, the factory tunes were pretty conservative and it was pretty easy to pick up power. But when these STI's need a re-flash just because you put a low-restriction exhaust, that would indicate that they are already as lean as is safe for 'normal' conditions. (This may be for fuel economy as well as emissions.)
From the sounds of it the newer stock STI tunes are not mod-friendly without appropriate ECU rework to re-match the fueling to the adjusted airflow.
Now add to that, that some of the people trying to do that ECU rework are completely new to the tuning game, and just trying what someone posted on the internet. Recipe for disaster.
And also COBB claims that the tune can't be detected if users swap back in the stock base map. Now these people may be claiming that they never tuned their car and it is all the factory's fault...