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Bump for a little bit of strange insight. Read in a mag (can't remember whether it was Race Tech or Racecar Engineering, I'll post correct one and issue later) that when the BTCC decided to go from the old S2000 formula (2.0L NA) to a new one using 2.0L turbos (instead of the 1.6L turbos in Europe and the new S2000 formula) they had to decide on some form of parity between the motors during a transition time.
The consensus was that the new 2.0L turbos would need about 15 hp (~5%) MORE hp to match the speed of the old 2.0L NA motors in the SAME chassis.
Interesting, but when you think of it the low rpm torque advantage of the turbo will not come into play as much in a racing environment where the cars are driven full out and kept in their powerbands as much as possible. And in this case the lag/poor response and lack of engine braking (?, cited in the article) are detrimental.
(Also remember that lag is just not related to the rpm for the engine to make boost, but also the time it takes to pressurize the intake tract/manifold as well as time needed accelerating the turbo on throttle application even if rpm is high.)
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Because titanium. |