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He wanted a comparison of the two. I can't say which is better, but I can give him a short breakdown which may be helpful. The whole concept here is that when you let off the throttle under boost, the MAS (located upstream of the throttle body) immediately senses the loss of intake volume and decreases fuel input. This is bad because there is still boosted air trapped farther upstream, and it is still "pushing" its way into the cylinders. This means that your car will run dangerously lean for several revolutions while still under more or less full boost. The BOVs and recircs take that trapped, boosted air and release it. BOVs release it into free air, hence you can hear it. Recircs send that air back to an earlier portion of the intake (I am not 100% positive on that point, it may be the exhaust or something, but it gets recycled into some other pipe one way or another). The only way this process affects your turbos directly is that when the compressor wheel encounters all that pressurized air and now has no more motive force from the exhaust side (due to the lower RPMs) it "hits a brick wall", in essence the pressurized air stops it in its tracks. Sounds bad to me. But in all these aspects the two approaches SHOULD perform in exactly the same manner. I am sure there are slight differences one way or another, but I see no reason these differences should be major. One may exist. As I said, I can give a breakdown of their function, but I have no tool for performance comparison besides logic (which generally works well).
"I wish a shitty movie made lame fucks want my car too." - YugoBernie (NoVA)"Grow up the Z is not the best car ever made. It is a damn good car though and God drives one." - morepower2 |
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00:29:53 07/02/03
