Quote:
Originally posted by NSX
How much power did the 2.0L S15 Silvia make with turbo? How much power did '98 Integra Type R make?
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You are comparing a 1.998L to a 1.797L, and at that, you are not factoring in the efficiency of the engines in terms of gas mileage. That is 52cc more, so that also plays a role.
Personally, I disagree with the comment that VTEC makes up for a turbo charger. All it does is allow more air into the chambers at high RPMs, like having a racecar's cam profile, but also having the ability to idle. Unfortunately, even though it will allow more air into the engine, that air is still the same density. A turbocharger increases that density, so the even though the intake valves are depressed for the same amount of time all the time, and they are depressed the same distance, more air molecules get into the engine at higher RPMs because the air is denser.
With VTEC, it is still just a more aggressive cam on a naturally aspirated engine, and the maximum airflow during VTEC engagement is always the same (ignoring temperature of course). On a turbo engine, there is no need for that aggressive cam lobe, because at higher RPMs, more air is getting in anyway, and since the cam is not aggressive, it still has a normal idle. The turbocharged engine does have a benefit also, by lacking VTEC, it lacks the chance of mechanical failure of that part. VTEC is a wonderful invention, though, because it is a way for a NA engine to perform better at the top end, while still getting excelent gas mileage.