2007 BMW Z4 E86 race car

Description

Translation: This is a track entry-level rear-wheel drive car based on BMW's famous Z4 E86 hardtop two-door sports car. The 51GT3 team spent a lot of money to build this car to fill the market gap of rear-wheel drive entry-level cars in the medium horsepower range, as the horsepower of GT4 cars is too high and TCR cars one level lower than GT4 are all front-wheel drive. There were four core design goals when building this car: 1. Achieve the same safety standards, aerodynamic kit, and braking efficiency as FIA GT4. 2. Emphasize stable power output in the medium horsepower range; use automatic transmission so that drivers do not need to spend time getting used to shifting gears and can focus on the road and vehicle dynamics to reduce the entry difficulty. 3. Reduce vehicle usage costs through lightweight and low-cost operation design, making entry-level rear-wheel drive training no longer expensive. 4. Achieve a power-to-weight ratio close to 981 GT4 through lightweight design (283 ps/t), with the goal of reflecting the flexible rear axle characteristics of medium horsepower rear-wheel drive cars in vehicle tuning and training drivers' ability to handle rear-wheel drive models as a target, with some challenges and high driving pleasure. After becoming proficient, drivers can easily upgrade to GT4 level rear-wheel drive racing cars. Base car model selection: BMW Z4 E86 3.0SI hardtop 3.0 Reasons for choosing this model: At that time, this BMW high-end sports car cost 800,000 yuan and had innate racing track genes. The vehicle quality was first-class, and the cross-era super-strong body rigidity and lightweight body provided an excellent foundation for track handling. 2. The most beautiful representative work of BMW in the Bangle era. On the track, racing cars also need to have style. 3. There are many second-hand sources of low-priced cars for sale in China, and spare parts are cheap and plentiful. 4. The stable engine and gearbox meet the requirements for horsepower output. Track safety upgrade: - The entire car meets FIA standard cage roll bars. - The entire car is equipped with imported lightweight resin explosion-proof glass from the UK. - RECARO's top-of-the-line RMS series carbon fiber seats (with FIA certification) - Scorth racing six-point safety belt (with FIA certification) - Racing carbon fiber integrated inner door panel - The driver's side door retains a collision-resistant steel beam. - Porsche GT4 original left and right side safety protection nets (with FIA certification) - All driver-side linings are covered with soft materials. - The driver's foot and leg space are wrapped in soft shock-absorbing materials. - Porsche GT3R Longacre wide-angle racing rearview mirror - Racing fire extinguisher Track handling upgrade: - Customized fish-eye bearing liners for the entire car - KW Clubsport 2way racing shock absorbers with adjustable top mounts - Custom-made 18-inch forged lightweight wheels with Michelin CUP2C semi-thermal melt tires - Porsche GT4 original front brake kit with AP RACING 2 rear brake kit - Italian MOMO 350mm racing GT steering wheel - Quaife ATB rear differential Track lightweight reduction: - The entire car's interior and electronic systems are stripped for weight reduction. - The entire car is equipped with imported ultra-lightweight racing resin glass from the UK. - Custom-made carbon fiber integrated door panels - Carbon fiber roof - Customized lightweight fiber hood - Top-of-the-line RECARO lightweight carbon fiber racing seats - Customized lightweight racing straight-through dual exhaust Total weight reduction: 285KG, weight after reduction: 1255KG Aerodynamic upgrade (GT4 level): - Porsche GT4 original carbon fiber rear wing; - Customized GT4 front air knife - Customized GT4 front bottom diffuser. - Customized headlight air guide hood (converts headlights into brake guide cooling devices) Engine and gearbox strengthening: - The engine is completely rebuilt, with ACL reinforced small bearings - The gearbox is completely rebuilt, with a customized gearbox oil cooler to ensure stable output in high temperature weather. - Customized front radiator intake air guide hood to improve intake cooling efficiency. - Customized front hood with heat dissipation holes to improve engine compartment cooling efficiency. Low operating cost design: - Four wheels of the same size customized forged racing wheels with the same tire specifications, tires can be interchanged front and rear at will, greatly reducing tire and wheel wear. - Customized headlight air guide hood (converts the most expensive part of the vehicle-the headlights into brake guide cooling devices) - Maintain BMW's original power and strengthen and optimize heat dissipation (more durable and reliable, cheaper to rebuild) - Use Michelin CUP2 235/45/R18 size, Michelin's top-rated semi-thermal melt CUP2 series has the highest cost performance (about 1,400 per tire), good quality, and low single-session training cost. (In testing at the Ningbo Circuit, a set of tires can run an average of 25 minutes dry for 8 sessions, with a single-session tire cost of only ¥700.) Track comfort design: - Side window glass can be opened for ventilation design - Rear window glass opening ventilation design - High-flow driver wind cooling system - In-car pre-installed Garmin Catalyst™ Driving Performance Optimizer track driving aid system bracket - Optional CHILLOUT ice clothing system and helmet cooling system Basic parameters after track modification: Vehicle size: Length 4,090 mm; Width 1,780 mm; Height 1,285 mm Wheelbase: 2,495 mm; Horsepower: 265 horsepower, torque Vehicle weight: 1100KG (lower than SRO GT4 similar models by 320KG) Power-to-weight ratio: 250 ps/t (VS Porsche 981 GT4 283 ps/t) Wheel specifications: 8JX18 inches Tire specifications: 235/45/R18 Brake system: SRO GT4 level Aerodynamics: SRO GT4 level Track safety system: SRO GT4 level

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