Dyno Dynamics: 318.6 WHP
Pina's Double D has no options and the shop employs a Patterson fan rated at 7,500 cfm. The strap-down procedure was unique. Pina uses a leverage bar at the rear that runs tie-down straps over the lower control arms, then secures to the dyno deck. Owner Andre Santoso said the DD's twin-roller design is more stable than a single-roller design and the leverage bar provides less suspension bind, which translates into smoother runs. It also makes getting vehicles on and off the dyno a snap.
Shop
Pina Motorsports
253-872-9495
www.pinamotorsports.com
Time in: 11:04 am
Time of first pull: 11:42 am
Time of last pull: 11:52 am
Mileage from last dyno: 57.1 miles
Dyno: Dyno Dynamics
Model: AWD 450DS
Type: Eddy current
Age: 2 years
Purchased: New
Software: 7.1.4 4WD Release
Options: N/A
Run 1: 318.2
Run 2: 319.7
Run 3: 318.1
Average: 318.6
Variance: 1.6 whp
Test gear: Fourth
Dynojet: 312.52 WHP
Wideband 02 monitoring to plot air-fuel ratio and an Analog Module that displays certain parameters in gauge format on the computer screen during a run are among the optional fare on Drift-Office's DJ. There are two 5,000-cfm fans at the ready.
While at the "office," we decided to explore the difference between the two most popular correction factors: SAE versus STD (standard). The SAE factor uses an ambient temp of 77 degrees versus 60 for STD. Barometric pressure is rated at 29.23 in-Hg for SAE correction and 29.92 in-Hg for STD. Both assume dry air. Drift-Office's Bob W. related the biggest difference is the assumed air temperature, hence with its cooler temp STD-corrected runs plot power higher. In the case of our EVO IX, the STD runs returned 320.9, 320.3 and 322.3 whp while the SAE corrected runs showed 312.2, 311.7 and 313.7 whp, about eight more horsepower. It's worthwhile to note that some Dynojets can be operated in inertial mode as well as eddy-current mode, which might give different results. Inertial mode is where power is measured by calculating how fast a car can accelerate the roller drums, which are of a known mass. Some feel that power pulls in inertial mode are a better representation of real-world conditions in terms of how the engine is loaded. Older Dynojets and two-wheel-drive units are typically inertial dynos only and had been the aftermarket standard for measuring power in the old days.
Shop
Drift-Office
253-288-3888
www.drift-office.com
Time in: 12:31 pm
Time of first pull: 1:07 pm
Time of last pull: 1:26 pm
Mileage from last dyno: 11.4 miles
Dyno: Dynojet
Model: 424xLC2
Type: Eddy current
Age: 2 years
Purchased: New
Software: WinPEP-7
Run 1: 312.2
Run 2: 311.7
Run 3: 313.7
Average: 312.5
Variance: 2.0 whp
Test gear: Third
Dynapack: 324.4 WHP
Dynapack dynos are unique. Their power absorbers are hydraulic systems that are self contained in cabinets. They have no rollers, instead the vehicle is jacked up with its wheels removed and its hubs are fitted with an adapter that joins the car to each cabinet. The cabinets or pods can be easily wheeled around, making the Dynapack great for space-limited shops and a supremely portable dyno that can be taken trackside. An external water source is needed for keeping the hydraulics cool.
Speed Factory's James Kemps says his Dynapack 4022 is basically two sets of 2,000 pods joined at the hip, if you will, enabling all-wheel readouts. Two Dayton portable blowers, rated at 2,870-3,500 cfm, are on call to chill the radiator and FMIC.
Shop
Speed Factory
253-566-4331
www.speedfactory.com
Time in: 2:18 pm
Time of first pull: 2:36 pm
Time of last pull: 3:04 pm
Mileage from last dyno: 22.3 miles
Dyno: Dynapack
Model: 4022
Type: Hydraulic
Age: 6 years
Purchased: Used 1.5 years ago
Software: RAH-SP V1.3-02
Run 1: 324.9
Run 2: 327.1
Run 3: 321.4
Average: 324.4
Variance: 5.7 whp
Test gear: Fourth
By Evan Griffey
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