Som jeg har forstået det, så er turboen hurtigere om at komme op i omdrejninger, når den har twin entry. Hvis du ikke har en twin entry manifold, oplever du altså at durboen er langsommere (hvor meget aner jeg ikke) om at spoole op, men du burde ikke opleve lavere effekt.
Citat:
The turbine is rarely subjected to constant exhaust pressure. In pulse turbocharged commercial diesel engines, twin-entry turbines allow exhaust gas pulsations to be optimized, because a higher turbine pressure ratio is reached in a shorter time. Thus, through the increasing pressure ratio, the efficiency rises, improving the all-important time interval when a high, more efficient mass flow is passing through the turbine. As a result of this improved exhaust gas energy utilization, the engine's boost pressure characteristics and, hence, torque behavior is improved, particularly at low engine speeds.
To prevent the various cylinders from interfering with each other during the charge exchange cycles, three cylinders are connected into one exhaust gas manifold. Twin-entry turbines then allow the exhaust gas flow to be fed separately through the turbine.
Dette er taget herfra:
http://www.turbomustangs.com/turbotech/main.htm
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