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Harman Motive 2006 Subaru WRX STi - Street Boxer

Harman Motive’s Time Attack STI Is Ready To Rumble, And We’re Not Talking About That Subi Exhaust Note.

Andy Hope
May 1, 2009
Photographer: Henry De Kuyper

Street class Time Attack cars are deceptive by nature. The rules require them to have full interiors, glass windows and be registered for street use, but aside from tire restrictions there’s little separating them from their Unlimited class brothers. This is especially true in the AWD class, where massive power can be put down even without grippy race tires. What you end up with are tame-looking street cars stuffed with full-on competition hardware.

The car seen here is well known amongst STI and EVO competitors. It was built by JC Meynet and Dan Harman at Harman Motive in Torrance, California. Despite its humble beginnings, the car has developed into a serious competitor, which has both Subaru and Mitsubishi owners chasing after it. In JC’s words, “This car was purchased new in September of 2005. It was used for commuting and taking some of my eight children to school. It even carried my grandson at times. Yes, I am that old. After suffering a broken wrist and having several surgeries, I decided to start tracking this car instead of continuing to race motocross. I won a few Time Attacks in 2007 and ended up winning Redline’s national street class championship and set track records at every track I raced at in 2008. I also won several Modified class races and even won the overall at the recent Subiefest event at Willow Springs in the Pro/Unlimited class while competing with my Street class setup!” Well, the car started humble anyway. And as Muhammad Ali said, “It ain’t bragging if you can back it up!”

When asked what order the car was built in, the guys at Harman Motive replied, “Suspension, brakes, power, more power, aero and lightness.” The suspension and brakes really aren’t all that exotic, they’re just carefully selected off-the-shelf parts that have been thoroughly dialed in at the track. Cusco Zero 2R coilovers and Cobb 25mm antiroll bars keep the chassis level while Whiteline and Kartboy links keep the Enkei wheels aligned through the corners. The tires change between Yokohama’s street and race compounds, depending on what class they’re running. Massive Stoptech rotors and calipers are pressurized by Harman Motive steel braided lines and Motul fluid. These are an absolute necessity considering the powerplant they have to regulate.

Under the hood lies a real-deal Cosworth engine. When the Harman Motive guys said they wanted power, they weren’t kidding. JC explains what a 2.6-liter CS600X is: “The motor is a complete long-block assembly from Cosworth that even has their own engine number assigned to it. They start with new OEM Subaru heads and block castings, then add their components and finesse. The crank is a stroked billet piece that is designed for better oiling and balanced so that it can safely touch 10,000 rpm, although we use 8500 as our limit. It uses Cosworth rods and pistons that have their pins relocated to work with the stroker crank. The bores are honed for a perfect fit. The heads get a CNC port job and a full Serdi radius valve job to allow for 1mm larger Inconel valves. Then it gets a full Cosworth valvetrain which is topped off by Cosworth’s cams. The motor gets its oiling from an upgraded higher-flow Cosworth oil pump fed by a huge baffled oil pan. A crank scraper helps to keep the oil in control and the assembly is held together by upgraded Cosworth gaskets and head bolts.”

To fulfill the “more power” requirement, they installed one of their very own Harman Motive rotated turbo kits. This includes an FMIC, a Tial 44mm V-band wastegate, a trick downpipe with wastegate recirculation and a hearty Garrett GT3582R turbocharger. To get everything optimized, the stock ECU was reprogrammed with a Cobb Accessport to the tune of 525 whp and 460 ft-lbs of torque. While you might expect that kind of power to be hard on the drivetrain, the car has performed reliably with stock differentials and axles—the only upgrade being an ACT clutch and flywheel package. The fuel system, however, did need some help.According to Dan, “Subarus have a bad habit of sucking air from the tank when going through hard turns. To combat this, we madea custom surge tank that is fed by a Walbro 255-lph pump mounted inside the stock gas tank. This fills a 1.5-quart aluminum surge tank that then feeds a Bosch 044 motorsports pump. This effectively eliminated the problem.”

The guys are pretty quiet when it comes to weight savings, but we suspect that as in other Street class cars, hidden things like airbags and insulation have been removed from under those stock-looking panels. Sparco seats and harnesses hold everyone in place while an array of AEM and Defi gauges monitor the engine vitals. Some minor aerodynamic alterations have been made to the factory hood and rear wing, and it’s hard to miss the Kognition front splitter which hangs below the factory front bumper. This will change soon, though, as Harman Motive has just sourced a Zero Sports widebody kit from EDO Performance in preparation for a full-on assault of the Modified and Limited time attack classes this year.

Never short for words, JC had this to say about the progress so far, “We have been very fortunate to have never suffered a DNF at any race over the past two years. We did have a few hurdles and challenges, but it was nothing that we couldn’t handle in time to make the races. I attribute the incredible preparation and tuning to Harman Motive and all of our awesome sponsors and helpers.”

Specifications & Details
’06 Subaru WRX STI
Engine
2.6-liter Cosworth CS600X EJ25 turbocharged 4-cylinder boxer

Engine Modifications
Cosworth honed block, 81mm steel billet crank, forged H-beam rods, forged 8.2:1 pistons, oil pump, crank scraper, baffled oil pan, CNC ported heads, +1mm SS intake valves, +1mm inconel exhaust valves, dual valvesprings, titanium retainers, and cam covers; Harman Motive rotated turbo kit including GT35R up-pipe, downpipe w/ wastegate recirculation, intercooler piping, FMIC, Tial 44mm V-band wastegate, Hose Techniques couplers, and Garrett GT3582R turbocharger; Koyo aluminum radiator; Harman Motive GT intake, race exhaust, oil cooler kit, fuel surge tank; Bosch and Walbro fuel pumps; Deatschwerks 950cc/min injectors; NGK spark plugs; Odyssey battery; VP MS109 fuel

Engine Management
Harman Motive tuned Cobb Accessport

Drivetrain Modifications
ACT clutch, pressure plate and Prolight flywheel; Motul fluids

Suspension
Cusco Zero 2R coilovers, strut tower bars and trailing arms; Cobb 25mm antiroll bars, Whiteline ALK extended ball joints, lateral links and subframe lockout; Kartboy endlinks

Wheels, Tires And Brakes
Enkei RPF1 17x9" wheels; Yokohama Advan Neova 255/40/17 (Street class,) A048 285/30/17 (Modified class;) Stoptech 14" front brake kit; Harman Motive SS lines, Motul fluid

Exterior
Kognition front splitter and undertray, Harman Motive Gurney lip equipped STI rear wing

Interior
Sparco seats, harnesses, fire suppression system; Personal steering wheel; Defi and AEM gauges; Racepak G2X data acquisition system

Numbers
525 whp and 460 wtq at 27 lbs of boost

Special Thanks
In addition to my excellent sponsors, I would like to thank my family and friends for their help and support, especially my wife Julie—couldn’t have done any of this without their help

By Andy Hope
29 Articles

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