Quote:
Originally Posted by moonmonkey
would extra egr flow be helpful in an engine that has vvti (toyota echo 1.5) i read in another forum where they said it was different methods of achiving the same thing, (the extra egr flow compared to (varible valve timing) . i dont understand them being the same, as was suggested.
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The ECM has the ability to close the intake valves early if it feels like it, or leave them open longer, to allow the engine to have lowered dynamic displacement.
Usually, they leave the valve open longer. The piston starts on compression stroke, and pushes some of that air back out into the plenum, so another cylinder on intake can use it.
The EGR flow accomplishes the same thing, only using a different method, by reintroducing spent gasses (which are mostly inert at this point) into the combustion cycle, allowing for less fresh air and fuel.
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