This is obviously a huge distinction for me, because I'll be much more competitive during my first season if I'm in a lower class.
[/sarcasm]
While it really doesn't matter at all, I'd like clarification just for peace of mind. If possible, I'd like to be in a class populated with cars that are putting down realistic target times for me to compare to (read: s4). I have an l28et engine in a 280z chassis, which was never a combination that came from the factory. The primary difference between the l28e and l28et is that little t on the end, indicating forced induction. All the mechanical components on the engine are stock to that engine. So, for swapping an n/a EFI engine out for a turbocharged EFI engine cost increase my adjusted displacement by 30% or 40% at the end of the day?
In the 'unprepared' section of the classifications document, it states that:
I'm unclear as to whether that also applies to SP, or if the l28et intake manifold is considered a modification. If it is, would swapping the original intake manifold back on negate the 10% from non-stock induction, or does the turbocharger automatically force me to accept both?Other than the air filter and its housings the induction system may not be modified to allow more air into the engine, such as oversize throttle bodies, carbs, or intake manifolds.
https://www.dropbox.com/s/gya2d1n8qdkpj ... 0Sheet.xls - Here is my current calculation xls (currently sp4), please feel free to let me know if I'm off on anything.