Tuning tips: Blow off valves or dump valves

[obi_waynne]

In a turbo engine the pressures build up as air is compressed and forced into the engine. The turbo is driven by the exhaust gases so the faster the engine goes the more air you get forced into the engine. This is fine until you lift off the accelerator. You engine speed does not instantly [...]
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[HDi fun]

With the adoption of variable geometry turbochargers these devices are becoming obsolete.