Super Street Network

 |   |  2003 Infiniti G35 - New Jersey Rock Star

2003 Infiniti G35 - New Jersey Rock Star

Classifying This G35 As "Well Rounded" Is The Understatement Of The Century

Adam S. Geczi
Dec 1, 2007 SHARE
0712_turp_01_z+2003_infiniti_g35+side_view Photo 1/17   |   2003 Infiniti G35 - New Jersey Rock Star

Perhaps it's the resulting speed and power or perhaps it's just the satisfaction gained when building something right and getting things done. Either way, Philip Petracca's '03 Infiniti G35 coupe is the manifestation of everything good about a well-built and fine-tuned twin-turbocharged import car that's sure to be a threat to rivals on and off the track.

The two most appealing facets about this project are its emphasis on building a scalable bottom-end and its meticulous top-end configuration. Everything else was done with the utmost regard to performance and perfection without an apparent cost consideration. Making the tale even more interesting is the long and difficult road traveled by Petracca due to the lack of early aftermarket support for the G35. As he put it, "This is no one else's molested project car." No stranger to motorsports, Petracca, who is also a world champion car audio competitor, secured the very first G35 coupe that landed at the local dealership in his central New Jersey hometown. Without regard to the warning signs, this project was off to a start. The obstacles that had to be overcome for making big power with the VQ platform were numerous, but for the most part on par with many mid-market production cars today.

0712_turp_02_z+2003_infiniti_g35+engine Photo 2/17   |   2003 Infiniti G35 - New Jersey Rock Star

As an example, the OEM fuel system on the G35 is returnless, an increasingly common solution by manufacturers to keep gasoline from having to make several trips to the engine compartment before passing through the fuel injectors. The returnless system reduces fuel temperatures in the tank, causing a reduction in fuel vapors to make it more environmentally friendly. However, it relies heavily on the ECU to manage fuel pump output. Cooler fuel has its performance benefit, in that it cools the incoming air/fuel mixture and combustion chambers. These systems aren't compatible with aftermarket engine management units since they would add another layer of complexity in high-performance applications with relatively little benefit.

Money was better spent elsewhere, like on the Weston Machine installed Darton steel liners, Wiseco forged pistons and the Power Enterprise twin-turbo kit with Full-Race upgraded Garrett GT2871R medium-frame ball bearing turbochargers. The steel liners generally found in top fuel dragsters, Darton's largest market, serve as the foundation for safely making big power. Among the key benefits are less cylinder wall wear and better ring seal surface that eliminate leak down and reduce friction between the sleeve and the Wiseco 8.8:1 oversized forged pistons. Full-Race replaced the PE1420 IHI turbos supplied in the Power Enterprise kit with the Garrett turbochargers because the IHI turbos aren't capable of breaking the 550hp mark. The GT28 turbos feature larger turbine and compressor wheels contributing to the 726 hp and 645 lb-ft of torque at 19.5 psi on C16 fuel. When bolted to a 1.8L engine - and each bank of the VQ35DE is close to that - one GT2871R is capable of at least 280 hp at the flywheel, therefore in pairs the turbos should yield 560 hp. Based on dyno figures, this configuration is far more potent since it increases displacement-to-output efficiencies beyond what is probable, much closer to the 900+hp hypothetical maximum flywheel output capability of, say, a twin-turbocharged 6.0L engine.

0712_turp_03_z+2003_infiniti_g35+intercooler Photo 3/17   |   2003 Infiniti G35 - New Jersey Rock Star

With dual turbochargers forcing air through the engine, significant modifications were necessary for the stock intake tract and cylinder head to handle the increased flow. The intake system, designed to provide air the path of least resistance, begins at the Power Enterprise Air Impulse II filter, where air enters the intake through the large front-mount intercooler, and moves to the Crawford raised plenum and the HeadGames Motorworks ported and polished heads. The Crawford plenum fixes many of the design tradeoffs inherent with the OEM part by increasing the plenum height around the number one and number four cylinders while still clearing the hood. By raising the plenum height, balanced airflow is achieved at each cylinder. Dave Localio at HeadGames outfitted the G35 cylinder heads with a number of goodies typically found in high-performance applications, like Ferrea valves, Jim Wolf Technology cams and Cometic headgaskets. ARP 0.5-inch head studs resolve the lifting issues in the cylinder that occurred past the 500hp mark - a congenital limitation of the stock VQ platform. The stock connecting rods and main studs were replaced with Pauter forged rods and ARP studs respectively.

The VQ35DE is also sensitive to backpressure, especially following such induction system modifications. Available aftermarket exhaust system options presented limitations around the 550hp mark, therefore something custom needed to be built. Don Zubritsky of Straightlinetuning.com rose to the challenge and pieced together a dual exhaust system that featured 3-inch stainless steel piping and Magnaflow race mufflers.

0712_turp_04_z+2003_infiniti_g35+right_front_view Photo 4/17   |   2003 Infiniti G35 - New Jersey Rock Star

The stand-alone HKS F-CON V Pro ECU presents the optimal solution for fuel and timing control. This almighty brain behind complex operations is capable of adjusting fuel delivery parameters based on intake air conditions to match a target air/fuel mixture value. Subsequently, various HKS sensors and harnesses to support engine management functions were added. The F-CON's full data logging capabilities include information on vehicle and engine speed, water and intake air temperature, timing, boost and injector duty cycles, which can all be downloaded. The Twin Power DLI II ignition amplifier unit from HKS controls spark duration, intensity and accuracy. Much was required when it came time for the fuel system makeover, though. Inside the tank, a 255lph Walbro pump provides the necessary volume for the high-pressure Bosch race pump that's externally mounted to an Altered Atmosphere Motorsports (AAM) fuel surge tank. The surge tank reduces fuel feed problems typical during extreme acceleration and cornering. Further downstream, AAM CNC-machined billet aluminum fuel rails deliver fuel to the RC Engineering 1,000cc injectors before passing through the pressure regulator and terminating back into the tank. Fuel plumbing consists of braided stainless steel hoses and anodized aluminum fittings.

0712_turp_05_z+2003_infiniti_g35+intake Photo 5/17   |   2003 Infiniti G35 - New Jersey Rock Star

Engine lubrication and cooling also needed to be improved to handle the additional demands placed on the modified VQ. The large Power Enterprise oil pan increases oil holding capacities and reduces oil temperatures by allowing each Motul 300V synthetic oil particle to sit in the pan for a longer period of time and lose more heat before being pumped by a Rev-up oil pump to a Setrab 6 series 19-row oil cooler and back into service. Because elevated coolant temperatures became an issue with the high-output configuration, a Koyo race radiator along with a Nismo thermostat and Samco hoses add to the ever-expanding parts list.

Drivetrain and suspension modifications followed the engine buildup in order to transfer the enormous power output. A Carbonetics triple disc carbon clutch with a 1,350kg pressure plate connects the engine to the transmission and an ACPT carbon driveshaft links it to the Carbonetics limited-slip differential matched to a stock casing and Nismo differential cover, which introduces carbon discs instead of metal. The carbon discs have the same locking performance but milder transitional characteristics, which improves apex-point acceleration in road racing applications. From the differential, 900hp-rated Level 5 rear axles acquired through the Driveshaft Shop deliver power to the 18x11 CCW SP16A Nitto NT-01 315/30/18 wrapped rear wheels. The front 18x9.5 wheels are fitted with 275/35/18 tires of the same kind. Grip is aided by a cornucopia of parts, including the KW Competition three-way adjustable racing coilover suspension built to Robispec specification, 350EVO.com camber adjustable front control arms, Hotchkis anti-sway bars and SPC Performance rear suspension components.

Petracca's G35 modification list is extensive. Fortunately, the pictures speak for themselves. Given Petracca's successes in audio competition, this coupe is sure to keep that Jersey shore rockin'.

2003 Infiniti G35
726 hp and 645 lb-ft of torque at 19.5 psi on C16 fuel
Engine
Weston Machine Spec'd Darton Steel Liners
Weston Machine Spec'd ARP 0.5-inch Head Studs
Extreme Duty Wiseco Forged Pistons
Pauter Forged Rods
Cometic Headgaskets
Power Enterprise Twin Turbo Kit with Cast Manifolds
Full-Race Upgraded Garrett GT2871R Turbos
HeadGames Motorworks Race Prep Ported/Polished Heads
Ferrea Valvetrain
ARP Main Studs
Jim Wolf Technology Cams
Rev-Up Oil Pump
HKS Twin Power DLI II
HKS Super Sequential Blow-Off Valve
HKS F-CON V Pro ECU
HKS V Pro Harness
HKS Pressure Sensor
HKS Air Intake Sensor
HKS Pressure/Air Intake Sensor Harnesses & Mount
HKS A/F Knock Amp with O2 Sensor
Technosquare Reflash
Straightlinetuning.com Dual 3-inch Stainless Exhaust with Magnaflow Race Mufflers
Straightlinetuning.com Oil Cooler with Setrab Core
Power Enterprise Oil Pan
Nismo Trans Cooler
Crawford Intake Plenum
RC Engineering 1,000cc Injectors
AAM Fuel Rails
AAM Fuel Return System
Upgraded Stock In-tank Walbro 255lph Pump
Bosch External Race Fuel Pump
Aluminum Surge Tank with Billet Aluminum Chassis Brackets
Braided Stainless Steel Fuel Lines with Anodized Fittings
CJ-motorsports.com Crank Angle Sensor Wire
Nissan VQ35 Rear Coolant Bypass System
Koyo Race Radiator
Nismo Thermostat
Samco Hoses
NGK Iridium Spark plug set (One step colder than stock)
Motul 300V Competition 15w50 synthetic oil
Soundgate ICB-500 Intelligent Circuit Breaker
Optima Yellow Top Battery
Evans-tuning.com V Pro Calibration
ForgedPerfromance.com V Pro Calibration

Drivetrain
Carbonetics Triple Disc Carbon Clutch with 1,350kg Pressure Plate
Carbonetics Carbon LSD (Limited-Slip Differential)
Straightlinetuning.com Steel-Braided Clutch Line
Motul Gear 300V 75W-90 synthetic fluid
ACPT Carbon Driveshaft
The Driveshaft Shop Level 5 Axles
Nismo Differential Cover
Nismo Short Shifter

Suspension
RobiSpec.com Full Race Preparation
KW Competition 3-way Adjustable Race Coilovers
350EVO.com Camber Adjustable Front Control Arms
Hotchkis Front and Rear Anti-Sway Bars
SPC Rear Camber/Toe kit
SPC Rear Camber Arm Kit

Brakes
Brembo Gran Turismo Brake Kit
Straightlinetuning.com Brake Lines
Motul RB600 Brake Fluid

Exterior
GReddy GRacer Front Bumper
GReddy GRacer Side Skirt
Seibon TS-Style Carbon-Fiber Hood
Carbon-Fiber Rear Spoiler
Aerocatch Locking Hood Pins
JDM Clear Front Side Markers
Exoticcustomsnj.com Custom Paint & Body Mods

Interior
ForgedPerformance.com Stainless Steel CNC Shift Knob
Sparco DTM Leather & Suede Carbon Fiber Racing Seats
Blitz SBC-iD iColor Dual Solenoid Boost Controller
Defi Gauges (Boost/EGT/Oil Pressure)
Defi-Link Control Unit II
AEM UEGO Wideband Gauge
Sparco Six-Point 3-inch Lap Harnesses
Alpine F#1 Status Headunit & Processor
Alpine F#1 Status 2-Way Component Speakers
Zapco Reference 650 Amplifier
Zapco 12-inch Subwoofer

Wheels/Tires
CCW Wheel SP16A (18x9.5 front; 18x11 rear)
Nitto NT-01 Tires (275/35/18 front; 315/30/18 rear
5Zigen Pro Racer Lightweight Aluminum Lug Nuts

SHARE ARTICLE
By Adam S. Geczi
17 Articles

RELATED ARTICLES

BROWSE CARS BY MARKET

MORE FEATURES

326 Power Nissan S14 Silvia - Still Got It
Yuta AkaishiNov 25, 2014
A Golf R that can play with the big boys
Michael FebboNov 21, 2014
Lexus IS 200t expected to arrive next year.
Mike ConnorNov 21, 2014
The hot hatch will have a starting price of $37,415.
Scott BurgessNov 20, 2014
iM will go into production and launch in the fall of 2015
Karla SanchezNov 19, 2014

SEARCH ARTICLES BY MAKE/MODEL

Search
TO TOP