Attachment 1
USCTrojanGT3's White GT4 Track Build w/ BBS Gold E88 Wheels & BBi Safety & Suspension Package


(Click on images for higher resolution)

We would like to present this White Cayman GT4 track build that we completed earlier this year. To turn her into a weekend track warrior, we gave it a proper setup with our complete BBi Autosport StreetCup Track Package along with other goodies from Cargraphics, Cobb Tuning, Schroth Racing, Tarett Engineering, and many more. After completion, this GT4 went straight to the track at Thunderhill with our friends from SP Motorsports from Northern California. Here are some pictures of the build progress that we would like to share:

Vehicle Specifications

Interior:

• BBi Autosport GT4 Roll Bar Satin Black
• BBi Autosport 991 GT3 / 981 GT4 Sub-Strap Bracket
• Schroth Profi GT3 Harness

Engine/Transmission:

• Cargraphic Exhaust
• IPD Competition Intake Plenum
• GT3 82mm Throttle Body
• Cobb AP V3 W/ Custom BBi Calibration
• Guard Transmission Pro LSD
• SP Lightweight Flywheel & Clutch Assembly

Front Suspension Upgrades

• BBi Bump Steer Kit Front
• BBi Adjustable Thrust Arms Front Pair
• BBi Adjustable Thrust Arm Bushings Front Pair
• BBi Lower Control Arm Inner Spherical Bearing (Mono-ball) End Kit Front Pair
• Tarett Engineering Adjustable Sway Bar End Link Front
• Tarett Engineering Upper Shock Mounts

Rear Suspension Upgrades

• BBi Rear Toe Adjustable Toe
• BBi Adjustable Thrust Arms Rear Pair
• BBi Adjustable Thrust Arm Bushings Rear Pair
• BBi Lower Control Arm Inner Spherical Bearing (Mono-ball) End Kit Rear Pair
• Tarett Engineering Adjustable Sway Bar End Link Rear

Wheels/Tires:

• BBS E88s

Few shots of the car before at our last BBi Customer Private Track Day








- Jerry@BBiAutosport.com

 

Here are some pictures of the suspension upgrades









Front Suspension Upgrades

• BBi Bump Steer Kit Front
• BBi Adjustable Thrust Arms Front Pair
• BBi Adjustable Thrust Arm Bushings Front Pair
• BBi Lower Control Arm Inner Spherical Bearing (Mono-ball) End Kit Front Pair
• Tarett Engineering Adjustable Sway Bar End Link Front
• Tarett Engineering Shock Mounts
• Swift Springs

Rear Suspension Upgrades

• BBi Rear Toe Adjustable Toe
• BBi Adjustable Thrust Arms Rear Pair
• BBi Adjustable Thrust Arm Bushings Rear Pair
• BBi Lower Control Arm Inner Spherical Bearing (Mono-ball) End Kit Rear Pair
• Tarett Engineering Adjustable Sway Bar End Link Rear
• Swift Springs

BBi Autosport Front Bump Steer Kit

• Helps eliminate bump steer by maintaining proper front end suspension Geometry
• Utilizes misalignment rod ends of the arm to provide maximum articulation
• Highly recommended for vehicles that have been lowered
• Each kit includes pair of 2 Links

BBi Autosport Rear Adjustable Toe

• Provides additional rear toe adjustment
• OEM link is non adjustable and eccentric bolt provides limited adjustment range, causing excessive tire wear and handling issues.
• Helps maintain proper rear end suspension geometry
• Each kit includes pair of 2 Links

BBi Autosport Front & Rear Thrust Arm Kit

• Connects the Lower Control Arm to the subframe
• Provides precision caster adjustability
• Spacers included for setting stock or anti-squat and anti-dive configurations
• Each Kit Includes Pair of 2 Links
• Fits both front and rear axles

BBi Autosport Front & Rear Adjustable Thrust Arm Bushing Kit

• Provides two eccentric mounting points
• Used to adjust for increasing or decreasing wheelbase, and adjustable caster.
• A must-have for extended lower control arms (GT3 control arms or eccentric monoballs) to correct for unintended caster change
• Compatible with all stock Porsche 996 and 997 lower control arms (including Porsche Motorsport Cup arms)
• Sold as a set of 2 or a Complete set of 4

BBi Autosport Lower Control Inner Spherical Bearing (Mono-ball) End Kit:

• Upgrades 981 GT4 front and rear control arms to improve chassis response by eliminating rubber bushings
• Improved inner bearing flange design. Slimmer and lighter than factory OEM & Cup style
• High-strength sealed teel alloy spherical bearings, completely serviceable unlike the motorsports arm
• Also fits all 986, 987, 996, 997 with upgraded GT3/RS OE front or rear split control Arms
• Each kit includes a pair of 2 inner bearing flanges

Tarrett Front and Rear Adjustable Sway Bar End Links

• Simple bolt in replacement for the factory drop links
• Left & right hand threaded rod-ends allow for simple length adjustment to eliminate swaybar preload
• Correctly sized, precision, Teflon-lined rod-ends for smooth and quiet operation, long life, and high reliability. No wear and rattling problems, like those seen with other designs, due to undersized or low quality rod ends
• Eliminates the factory compliant plastic drop link bushings that deflect under loading and quickly wear out
• High misalignment, stainless steel spacers allow for superior bind free operation and corrosion resistance
• Precisely connects the stock or adjustable swaybar to the front strut assembly for improved feedback and swaybar response
• Overall length is adjustable to accommodate either stock or adjustable swaybar requirements

 

To extract the more power and improve response, we installed the IPD and Cobb Power Package, along with SP Motorsport's lightweight clutch & flywheel kit.

• IPD Competition Intake Plenum
• GT3 82mm Throttle Body
• Cobb AP V3

BBi Lightweight Clutch & Flywheel Installation





BBi Porsche Cayman GT4 Lightweight Flywheel & Sport Clutch Kit



Product Link: https://www.bbiautosport.com/product...rt-clutch-kit?





The weight differences between the lightweight single mass versus OEM dual mass are 13.40 lbs vs 27.05 lbs, and 27.95 lbs versus 39.40 for the complete assembly. These significant weight savings helps improve throttle response and is a must upgrade for these cars.






IPD Competition Intake Plenum & GT3 82mm Throttle Body Installation

To improve airflow, we used the IPD Porsche 981 Competition Plenum to replace the restrictive factory plastic unit.






BBi 981 Stage 2 Power Package with IPD Competition Plenum & Cobb Accessport V3 ECU Upgrade Package



981 IPD 82mm Competition Plenum





Custom IPD silicone Hose Designed to Perfectly fit The alarger 82mm Throttle Body


Diversion Splitter and Dimpled Interior

The new 981 Plenums also benefits from the internal dimpling effect that have been implemented on all Plenums moving foward. This internal dimpling allows us to control the boundary layer and maximize airflow. Just like a dimpled golf ball travels farther than a smooth golf ball. Controlled turbulent air creates less friction and "tumbles" over a given area more efficiently.

IPD 981 IPD 82mm Competition Plenums Features:

• Increases horsepower, torque, and boost responsibly optimizing air flow efficiency
• Utilizes diversion splitter and dimpled interior surface eliminate turbulence and increase air flow
• High quality cast aluminum construction
• Direct fit OEM replacement
• Larger 82mm competition plenum version available
• Made in USA

Side by Side Comparison Between the Factory and IPD 981 IPD 82mm Competition Plenums:







82mm vs 74mm Throttle Bodies





Cobb Tuning Porsche Cayman GT4 Accessport V3



Features

• Simple Installation: Everything is included for the simple installation you can do in your driveway! Intuitive on-screen instructions identify your exact vehicle, saves stock vehicle data, and displays available OTS maps.
• Change Maps: Store up to 100 maps from our OTS map database or from your favorite COBB tuner and quickly switch between them for any need.
• Vehicle Upgrade Support: As you continue to modify your car, Accessport maps can be used to optimize performance upgrades. Changing the map can be done in less than 1 minute in your driveway.
• In Car Mount: The Accessport can be mounted in vehicle to allow you to monitor the performance data.
• Data Logging: Record multiple data channels simultaneously for in-depth evaluation of engine performance. Stores up to 1 hour of continuous data.
• Gauges: Use your Accessport as a gauge to monitor boost or any other live information, directly from the ECU.
• Trouble Codes: Read engine trouble codes to diagnose issues. Clear them when resolved. Prevent expensive trips to the dealership.
• Full Uninstall: Using the Uninstall option will completely remove our programming from the car’s ECU. It is then able to be re-installed after a dealer visit or on another vehicle.

 

After the supension and power upgrades are in, we installed our Safety Package which includes Bolt-in Roll Bar, Sub-Strap Mount, and Shroth 6 point harnesses to properly secure the driver and provide additional protection.




BBi Autosport GT4 Safety Package:

• BBi Autosport GT4 Roll Bar Satin Black Finish
• BBi Autosport GT4 Sub-Strap Mount
• Schroth Profi GT3 6 Point Harness

Satin Black powdercoat finish for a subtle appearance


Schroth Racing 991 GT3 harness


BBi Autosport GT4 Sub-Strap Mount



Roll Bar installation process

 

Harness Installation





Proper sub-strap harness angle achieved with our BBi mount

 

Everything installed back into the car





BBi 981 GT4 StreetCup Harness Bar



Key Features

• Chrome moly steel tubing utilized for excellent strength to weight ratio
• Modular construction to allow access to engine for servicing without removing entire roll bar
• Shoulder harness mounting crossbar positioned at appropriate height as per Schroth's instructions
• TIG welded and utilizes "X" braces on rear section for superior strength and rigidity
• Mounts to frame structure and rear strut tower to provide strongest mounting points and maximum protection
• Utilizes laser cut mounting plates & inner diameter tube clamps that are CNC turned and milled for a precise fit
• Designed to work with stock or any aftermarket seats on the market
• Minimal affect on seat travel to accommodate taller drivers
• Can be used with stock seat-belts or 6 point harnesses for track use
• Designed to work with wrap-around style harnesses while optional eyelet bolt provisions are available for clip-in harnesses
• OEM fit & finish. The main hoop contours entire arch of the roof with an even curve
• Finished in satin black powder coat. Other colors available
• Bolt-in installation requires no drilling and minimal carpet trimming

BBi Porsche 991 GT3/ GT3RS / Cayman GT4 Sub-Strap Mount




If you have the optional Sport Bucket seats and planning to install 6-point race harnesses, then you will need this bracket. Shown here as a pre-production example, this bracket bolts directly to the seat and keeps the harnesses at the proper 10-20° angle regardless of the seat position.





Corner Balance & Alignment











At Thunderhill Raceway with SP Motorsports

 

 

Nice to see someone using RE-71s. Something I can't thanks to Porsche's tire size decision for the 981 Boxster Spyder.

 

I think this is the car I purchased from Porsche Barrington in January. Most of the trick bits have been removed but it is still an amazing car.
Beat my best time at Road America by 9 seconds first time out.