NC DYNO: INTAKE, EXHAUST, MIDPIPE, HEADER, SUPERCHARGER!
Posted: Thu Sep 21, 2006 10:15 am
On a dyno dynamics unit we were stock 130 to 132 at the wheels across several runs (remember that the factory claim of 170 is "crank" horsepower for 2006 and 166 crank hp for 2007 under the new testing procedures). These results are identical to what AEM and Grassroots MotorSports got for stock on their project cars. With AEM intake and exhaust we hit peaks of 145-148 depending on the run...again on a Dyno Dynamics unit. Figure about half that for the AEM intake (which is in line with their claims and dyno charts) and half the exhaust.
Note that the The Dyno Dynamics dyno is an eddy-current dyno, it is not an inertia dyno. Without getting into that debate about what is a "real dyno", just understand that conversion between these types of dynos is rough at best....and it is much preferred to compare apples with apples by doing all before and after tests on the SAME DYNO.
Now to the dynos comparing mods. THREE levels of mods below.
LOWEST line is our best NC dyno run with AEM intake and our RoadsterSport DUALs, a nice gain of about 14-16 horsepower over stock NC.
MIDDLE run adds the midpipe change. This midpipe change was VERY interesting. Did several runs and they all look like this with a very slight loss of 2 peak horsepower but a gain of 5 to 8 Ft/lbs of torque from 3500 all the way past 6000 rpms. This is still a prototype unit but production hopefully by Christmas...
HIGHEST RUN adds in the header. NICE 158.9 hp and 137 Ft/Lbs!! This is Header with our midpipe and exhaust and the AEM intake. Note that the RoadsterSport header does NOT have hookups for O2 sensors, but we sell the extension cords to make this install plug and play. The RoadsterSport midpipe includes TWO O2 sensor bungs, one before and after the catalytic converter to make it easy to relocate the sensors with the optional extension cables to avoid codes. Our RoadsterSport Midpipe uses a massive 18 inch long resonator to keep sound the same despite the gain in flow over the stock unit… but adding header will add a lot of sound. If you like old Italian Fiats and Alfas then you will love the sound of this car with the header, and those with more delicate sensibilities should consider our headers that include a converter in the header itself. Note the interesting comparison with the Grassroots MotorSports project NC Spec Miata; we started with the exact same baseline results and finished almost the same, 2 hp and 2 ft/lbs stronger, all the gains of the full race system without the full race system noise.
Note that the The Dyno Dynamics dyno is an eddy-current dyno, it is not an inertia dyno. Without getting into that debate about what is a "real dyno", just understand that conversion between these types of dynos is rough at best....and it is much preferred to compare apples with apples by doing all before and after tests on the SAME DYNO.
Now to the dynos comparing mods. THREE levels of mods below.
LOWEST line is our best NC dyno run with AEM intake and our RoadsterSport DUALs, a nice gain of about 14-16 horsepower over stock NC.
MIDDLE run adds the midpipe change. This midpipe change was VERY interesting. Did several runs and they all look like this with a very slight loss of 2 peak horsepower but a gain of 5 to 8 Ft/lbs of torque from 3500 all the way past 6000 rpms. This is still a prototype unit but production hopefully by Christmas...
HIGHEST RUN adds in the header. NICE 158.9 hp and 137 Ft/Lbs!! This is Header with our midpipe and exhaust and the AEM intake. Note that the RoadsterSport header does NOT have hookups for O2 sensors, but we sell the extension cords to make this install plug and play. The RoadsterSport midpipe includes TWO O2 sensor bungs, one before and after the catalytic converter to make it easy to relocate the sensors with the optional extension cables to avoid codes. Our RoadsterSport Midpipe uses a massive 18 inch long resonator to keep sound the same despite the gain in flow over the stock unit… but adding header will add a lot of sound. If you like old Italian Fiats and Alfas then you will love the sound of this car with the header, and those with more delicate sensibilities should consider our headers that include a converter in the header itself. Note the interesting comparison with the Grassroots MotorSports project NC Spec Miata; we started with the exact same baseline results and finished almost the same, 2 hp and 2 ft/lbs stronger, all the gains of the full race system without the full race system noise.