16-05-2012, 12:57 PM
In my view, dumping on a diesel is wasting energy you have put into making compressed air and intercooling it!
Let it run through the cylinders during a gear change and take some heat energy out of the head/exhaust manifold/turbo turbine, rather than simply dump it.
If you want performance, technically a dump value IS reducing it. It just isn't about the noise, it IS inefficient and probably costing you (very marginally) on energy to re-boost the intake system (and thus get the pump boost compensator wide open again for max fuelling), and leaving the turbo sat in more heat running less efficiently than otherwise.
Dump valve = dumb valve... unfortunately.
If it was just the noise it'd be tolerable, but the cost suddenly makes them not sensible at all imo!
Dave
Let it run through the cylinders during a gear change and take some heat energy out of the head/exhaust manifold/turbo turbine, rather than simply dump it.
If you want performance, technically a dump value IS reducing it. It just isn't about the noise, it IS inefficient and probably costing you (very marginally) on energy to re-boost the intake system (and thus get the pump boost compensator wide open again for max fuelling), and leaving the turbo sat in more heat running less efficiently than otherwise.
Dump valve = dumb valve... unfortunately.
If it was just the noise it'd be tolerable, but the cost suddenly makes them not sensible at all imo!
Dave