Quote:
Originally Posted by markley02
O2 sensor isn't a problem. I don't want to go too indepth here, but the evo ecu operates in 2 modes. Open loop and closed loop. It uses "closed loop" while idling and cruising. During that time it uses the front O2 sensor to get a 14.7:1 afr. During the time this will be happening I will be in "open loop" which the ecu just uses the air fuel map to put in a certain amount of fuel.
This is why we cant VTA without running rich. With things this way, the ecu will read the afr as if I am recirculating the bov.
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Crap, totally forgot about it running open loop, nvm
Sounds like a cool idea, but then again how will the introduction of cooler air into the exhaust manifold effect air temperature and flow? If the reason people heat wrap/coat their headers is to maintain heat and exhaust velocity, wouldn't this be counter productive? Then again the air might be insignificant in comparison to the heat levels in the manifold... there has to be a reason why mitsu did this on non-US evos.
I'm all for this, would love to see it work. Search google for some videos with this on - there is an evo in a tunnel revving with this and when it backfires it is louder than a shotgun.