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When installing a ram air to a 4.6 2v with stock mas and no tune do you have to unplug ECM to make mod give a improvement? I read that in the tech article just want to make sure. I know it will not make more than ten horse to wheels but a motor is a air pump so more air is good for future mods.
 

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the improvement will be very very minimal unless you're going close to the speed of sound. The problem with your view of an engine being an air pump is that the pumping is not being restricted much with stock equipment if the heads/cams/intake is stock. An engine is an air vacuum-source more correctly, than it is an air pump---the "pump" is mother nature's own atmospheric pressure and it will not force more air in past the choke-point(s) like a power-driven mechanical pump/compressor, aka: super/turbocharger. That being the case, the only time unplugging/clearing the pcm is beneficial is if there are stored corrections that are already inhibiting your performance.
 

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the only time unplugging/clearing the pcm is beneficial is if there are stored corrections that are already inhibiting your performance.
The PCM stores corrections to compensate for things that are inhibiting performance or out of specification; ie. transmission adaptives will change shift timing to compensate for worn clutch packs, etc. Clearing the PCM's memory brings it all back to the original program and makes the PCM re-learn everything it had already compensated for. There is no performance benefit to un-plugging the PCM unless youve fixed an actual problem.
 
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