BMW M3 1997 1998 2002 2003 2004 2008 2009 2010 2015 2016

2004 BMW M3 M3 Description

Thiscar was built at Precision Chassis Worksin Gilbert Arizona, and was #3 of 4, ALMS, GTR M3 chassis that were built to mimic the original BMW Motorsports/PTG cars. These cars were built based on one of the actual, original, GTR’s that was campaigned in ALMS. (coincidentally this car was also chassis #3 from PTG).The car features more detail than I can write, but I will do my best to cover the important things.

BODY WORK/CHASSISThe car started out as a 2004 M3 with low miles and no collision history. The body panels are all carbon fiber, and are exact replicas of the original body work on the PTG car. The molds for these parts were literally taken right off of an original GTR. For those who don’t already know, this wide body package not only makes the car wide, but it also raises the wheel wells up in the chassis to allow for a lower ride height, and also allows for the use of a taller rear tire (rear tire size is 325/710/18). To make all of this possible and functional, drastic modifications had to be made to the chassis and suspension system. The front wheel wells were cut out and raised almost 2”. The rear wheel wells were also cut out and raised 3”. Changes to the chassis were also made to facilitate the custom suspension system in the rear. The cage in the car was made to duplicate the BMW Motorsports cage as much as possible, while still being legal for club racing without an FIA certification. The rear subframe mounts (now the differential mounts) were tied into the cage, as well as the front shock towers. The rear window and quarter windows are polycarbonate, but the windshield is glass for easy maintaince. AeroCatch hood pins keep the hood and deck lid closed. The car weighs in at just a hair over 2700lbs with no driver and a half tank of fuel, with a PERFECT 50/50 weight distribution.SUSPENSION/BRAKES/WHEELSBecause of the low ride height, the suspension system was heavily modified to correct all of the geometry and make everything work correctly. This meant that the rear subframe was completely removed and we once again, copied what PTG had done on the original GTR’s. Because we had an original car to copy, all of the rear suspension geometry and design is exactly how PTG did it. We were even able to build a fixture, based on a set of original, cast aluminum PTG trailing arms, and manufacture our own tubular steel arms that operate exactly like the originals. To make all of this work, the chassis had to be modified to raise the trailing arms and the differential upward, just like PTG did, and new mounting provisions had to be fabricated. This also required that the driveshaft tunnel and rear seat pan had to be clearance for the driveshaft. A custom, bladed rear sway bar was also fabricated to match the bars that were on the original PTG cars. The front suspension received the custom, wide body, Bimmerworld lower control arms, which also incorporate roll center correction. The tie-rods are Ground Control and feature bumpsteer correction. The coil-overs are JRZ RS Pro with remove reservoirs. The brakes are a Brembo kit (4 piston front and rear) with 355mm front rotors. The brake booster has been eliminated and in its place, a custom, dual master cylinder bias box was added, and the factory brake pedal was modified to operate with the correct pedal ratio with a pair of Tilton master cylinders, and a Tilton cockpit adjustable brake bias knob. The brakes are cooled through carbon fiber brake ducts in the front bumper opening. The wheels are CCW monoblocks that are 18x11 front and 18x12 rear.ENGINE/TRANSMISSIONS/DIFFERENTIALThe engine is a stock S54 with perfect leakdown numbers. DINAN throttle bodies were added prior to the build. A TMS under drive pulley kit was installed. The transmission is a stock 6 speed, with a light weight flywheel and clutch package. The differential was sent to DiffsOnline and they installed their LSD along with a 4.10 final drive and REM treatment on internal components. The transmission is shifted by an AKG shifter. A custom engine oil cooler system and power steering system were added using Setrab oil coolers. A differential cooler system was also installed and also uses a Setrab cooler along with a Tilton pump. The engine is cooled using a Bimmerworld (C&R) aluminum radiator and custom expansion tank. Custom radiator ducting directs air through the radiator.ENGINE MANAGEMENT/WIRINGThe stock M3 engine management system was isolated from the rest of the chassis harness and modified to place the ECU inside the cockpit. An AEM Infinity ECU is used to control the engine, and was tuned for both 91 octane (310whp) and 100 octane (336whp) by DynoComp in Scottsdale AZ. A custom chassis harness was made from scratch, and a RacePak dash monitors the engine and provides datalogging.EXHAUST/INTAKEThe exhaust consists of Euro headers that feed into a custom stainless steel, side exit exhaust system. The intake uses a stock air box with an AFE elbow and a custom intake tube with a dry element cone filter behind the carbon fiber headlight delete panel. The air box and intake tube are covered in gold reflective foil to reflect heat from the engine block and radiator.SAFETY/INTERIORBesides the cage system, the car also features a new Racetech “halo” seat, Schroth 6 point harness, Safecraft 10lb Halon based fire suppression system, and a dual activation battery disconnect system. The dash is a custom carbon fiber piece that is amazingly light weight. A 24qt Cool Shift system is installed as well as an AllView mirror, and disconnect Momo suede steering wheel.FUEL DELIVERYThe stock fuel system was removed, and an ATL, 32 gallon fuel cell was added in the trunk (which is sealed from the cockpit) using a custom fabricated fuel cell mounting system and enclosure, which feeds the Bosch 044 pump and 750cc injectors. An OEM fuel filter and fuel pressure regulator were used for easy service, and all fuel lines are -6 AN.EXTERIORThe exterior features a vinyl wrap, done in the Jeff Koons Art Car theme. Under the wrap, the exterior of the car is in primer, so if the next owner would like to paint it, it would be very easy to do.This would make a GREAT GTS4 car.

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