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No real difference in the sensitivity mate. Due to our diesel being a slow revving motor and only making its peak torque and hp so low in the rev range we cannot achieve the velocities that a petrol can to make a tuned length runner work. Also in a turbo application a diesel is on boost pretty much the entire time your driving, Oldmav's ute Makes boost at idle. To allow us to get better values we require the shortest possible distance to the valve to allow better cylinder filling, filling the cylinder more efficiently increases our volumetric efficiency and in turn our turbo works better for our low speed engine.
Most of this stuff is all for to help the turbo work the way it was designed, ideally what we are wanting the achieve is a drive ratio for the turbo at 1:1 or better (imp:emp ratio). When we achieve this we can push ve above 100%.
Last edited by nissannewby; 15th February 2014 at 10:54 AM.
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