Bulgarian Teen Builds 530hp BMW Z3 M V10 Coupe
Eighteen-year-old Denislav Shishev has transformed a BMW Z3 M Coupe into a 530hp V10-powered machine, combining the S85 engine and SMG transmission from the E60 M5.
At just 18 years old, Denislav Shishev from Bulgaria has completed a striking project: a BMW Z3 M Coupe fitted with the 5.0-litre V10 engine from the E60 M5. The build delivers 530hp and 600Nm of torque, all channelled to the rear wheels through BMW’s seven-speed SMG transmission.
The S85 V10, originally developed for the E60 M5 and M6, is a high-revving naturally aspirated unit producing 507hp in standard form. Shishev’s build claims a higher output, likely thanks to modifications, although exact details of the upgrades have not been specified. The SMG (Sequential Manual Gearbox) is also taken from the M5, retaining the automated clutch and paddle-shift operation.
At 1,420kg, the custom Z3 M Coupe is heavier than the original, which weighed around 1,420kg in M form, but the V10’s power more than compensates. The quoted top speed is 211mph, far exceeding the electronically limited 155mph of the standard M Coupe and even the M5 donor car. The conversion retains rear-wheel drive, which, combined with the short wheelbase and high output, makes this a demanding machine to handle.
A look at the build details
The Z3 M Coupe, often called the “breadvan” for its distinctive shooting brake profile, is already a cult classic among BMW enthusiasts. Shishev’s project involved extensive fabrication to accommodate the larger V10 engine and transmission. The S85 is physically much larger than the original S54 straight-six, requiring custom engine mounts and significant changes to the engine bay. The SMG gearbox also demanded a modified transmission tunnel and electronics integration.
No details have been released about the suspension or braking upgrades, but with the power on offer, uprated components would be essential. The car’s final weight is helped by the Z3’s relatively compact chassis, but the V10 swap inevitably adds mass over the front axle.
Context among BMW M cars and custom builds
Engine swaps into the Z3 M Coupe are not new, but fitting the S85 V10 is rare due to the complexity and cost. Most modified Z3s use straight-six or V8 engines from other BMW models. The S85’s electronics, oiling system and physical size make it a challenging choice. For comparison, the E60 M5’s V10 was one of the most advanced naturally aspirated engines BMW produced, with individual throttle bodies and a redline above 8,000rpm.
Shishev’s project stands out due to his age and the ambition of the build. While the car is not a factory product and would not be road-legal in many countries without extensive certification, it demonstrates the appeal of BMW’s modular engineering and the enthusiasm of younger tuners.
- BMW Z3 M Coupe (original): 3.2-litre S54 straight-six, 325hp, 1,420kg
- BMW E60 M5: 5.0-litre S85 V10, 507hp, 1,830kg
- Shishev’s Z3 M V10: 5.0-litre S85 V10, 530hp (claimed), 1,420kg
For those interested in other BMW coupe developments and factory models, see BMW 4 Series Coupe Spied With Barely Any Camouflage.
