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Guest
·"The first “practical” turbocharged road car eventually appeared in 1975, that’s the Porsche 911 Turbo 3.0. To reduce turbo lag, Porsche engineers designed a mechanism allowing the turbine to "pre-spin" before boosting. The secret was a recirculating pipe and valve: before the exhaust gas attains enough pressure for driving the turbine, a recirculating path is established between the fresh-air-charging turbine's inlet and outlet, thus the turbine can spin freely without slow down by boost pressure. When the exhaust gas becomes sufficient to turbocharge, a valve will close the recirculating path, then the already-spinning turbine will be able to charge fresh air into the engine quickly. Therefore turbo lag is greatly reduced while power transition becomes smoother."
Got that from here:
http://autozine.kyul.net/technical_school/engine/tech_engine_3.htm
Just posting it. Can't really discuss the effectiveness of it, only way is for someone to try.
Got that from here:
http://autozine.kyul.net/technical_school/engine/tech_engine_3.htm
Just posting it. Can't really discuss the effectiveness of it, only way is for someone to try.