'05 Honda S2000(AP2)
Dynamometer Model: Dyno Dynamics 450DS AWD
Testing Facility: ATX Motorsports
Installation: Mike Markowitz
Tuning: Brendan Moran
Baseline
Pros
In '04, the Honda S2000's manically revving 2.0L F20C engine was replaced with the 2.2L F22C. Although the peak horsepower output between the two motors remained at 240 hp, the F22C displays a broader torque curve, increasing output by 9 lb-ft to 162 lb-ft, thanks to a 6.7mm increase in stroke. Like earlier models, the '05 S2000 possesses a hybrid monocoque body, high X-bone frame, and a near perfect 50/50 weight distribution, making it a favorite amongst track warriors and tuners alike.
Cons
Although extracting power from a smaller displacement, naturally aspirated engine is always challenging, the F20C and F22C are notoriously stubborn in delivering gains. Using such a temperamental car for this particular Power Pages, we've selected parts that are guaranteed to maximize performance throughout the entire power band, particularly focusing on the 5,000 to 6,000 rpm range.
Notes
We were a bit surprised by the lower-than-expected baseline numbers produced by our S2000. This particular car has seen more than a few track days, and is daily driven with over 60k miles on the odometer. Factoring in that we were testing on a Dyno Dynamics dynamometer, which has a reputation for being a heartbreaker, we more than likely had the reasons behind our low baseline readings. Don't read too much into peak baseline numbers; power and torque differences will always exist between various dynamometers. The dyno should always be regarded as a tuning tool to monitor how an engine responds with modification.
Toda "Torquie-kun" 4-2-1 Exhaust Manifold
Parts
Toda Header
Tools
10-, 12-, 14-, and 22mm sockets, 10-, 12-, 14-, and 22mm open-end wrenches, ratchet, extension and swivel socket, WD-40, PB Blaster
Installation Time
90 minutes
Pros
Toda's new "Torquie-kun" exhaust manifold features a 4-2-1, equal-length, tubular design, which helps boost mid-range torque without compromising high-end power. The Torquie-kun header, like all Toda exhaust manifolds, is hand built at the Toda factory by the same team that builds Toda Formula 3 and 4 race car components. The header's horsepower and torque gains were evident in the mid-range once VTEC was engaged. Installation was effortless, thanks to precise fitment and craftsmanship. Since this manifold retains the factory catalyst and stock O2 sensor, it won't throw any annoying check engine lights (CELs), keeping your S2K street legal in 48 states. The header also comes standard with an extra O2 sensor bung and plug-a nice touch if you plan on tuning with an aftermarket wideband.
Cons
Although the header performed well in testing, the cost-to-power ratio may simply be too high for S2000 owners to swallow, and as many veterans know, coaxing additional power from the F22C is never easy. But due to the S2K's diminutive curb weight, even small gains can easily translate to real-world performance.
Notes
We would have loved to install our headers on a lift, but one was not available at the time, requiring us to resort to floor jacks and stands for the install. With the chassis approximately 20 inches off the ground, it was surprisingly easy to remove the stock header and replace it with the Toda unit from underneath the frame, requiring neither great effort nor the removal of extraneous engine components. Although you can reuse the stock header gaskets, it's never a bad idea to pick up new OEM replacements to eliminate the chance of an exhaust leak.