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Compare
Compare 2–4 cars side by side. Every figure is sourced; the best value in each comparable row is marked.
| Specification | Porsche2024 Porsche 718 Spyder RS | BMW2025 BMW M850i xDrive Convertible |
|---|---|---|
| Performance | ||
| Top speedHigher is better | 191 mphBestManufacturer claim · Porsche | 155 mphManufacturer claim · BMW |
| Power-to-weight ratioHigher is betterCalculated from peak power and curb weight — figures quoted against a different weight basis (e.g. dry or DIN) will differ. | 350.0 hp/tBestCalculated | 243.5 hp/tCalculated |
| Lateral accelerationSkidpad radius and surface affect results. | 1.05 gIndependent test · Car and Driver | — |
| Acceleration | ||
| 0–60 mphLower is betterRollout (1ft) handling differs between testers and manufacturers. | 3.20 sBestManufacturer claim · Porsche | 3.80 sManufacturer claim · BMW |
| 0–100 km/hLower is better | 3.40 sBestManufacturer claim · Porsche | 3.90 sManufacturer claim · BMW |
| 0–100 mphLower is better | 6.60 sBestIndependent test · Car and Driver | 8.30 sIndependent test · Car and Driver |
| 0–200 km/hLower is better | 10.9 sBestManufacturer claim · Porsche | 13.5 sIndependent test · auto motor und sport |
| Quarter-mile elapsed time | 10.90 sIndependent test · Car and Driver | — |
| Braking | ||
| 70–0 mph braking distanceLower is better | 147.0 ftBestIndependent test · Car and Driver | 151.0 ftIndependent test · Car and Driver |
| 100–0 mph braking distance | 290.0 ftIndependent test · Car and Driver | — |
| Engine & Powertrain | ||
| Peak powerHigher is better | 493 hpManufacturer claim · Porsche | 523 hpBestManufacturer claim · BMW |
| Peak torqueHigher is better | 332 lb-ftManufacturer claim · Porsche | 553 lb-ftBestManufacturer claim · BMW |
| Engine displacement | 3996.0 ccManufacturer claim · Porsche | 4395.0 ccManufacturer claim · BMW |
| Cylinder count | 6Manufacturer claim · Porsche | 8Manufacturer claim · BMW |
| Engine layout | Flat-6Manufacturer claim · Porsche | V8Manufacturer claim · BMW |
| Engine placement | MidManufacturer claim · Porsche | |
| Dimensions | ||
| Length | 174 inManufacturer claim · Porsche | 191 inManufacturer claim · BMW |
| Width | 72 inManufacturer claim · Porsche | 75 inManufacturer claim · BMW |
| Height | 49 inManufacturer claim · Porsche | 53 inManufacturer claim · BMW |
| Wheelbase | 98 inManufacturer claim · Porsche | 111 inManufacturer claim · BMW |
| Ground clearance | — | 5 inManufacturer claim · BMW |
| Weight | ||
| Curb weightLower is better | 3109 lbBestManufacturer claim · Porsche | 4736 lbManufacturer claim · BMW |
| Fuel Economy | ||
| Fuel economy (combined)Higher is betterLower L/100km is better; higher mpg is better — direction is on the canonical L/100km. | 16.0 mpgHomologation · US EPA | 19.0 mpgBestHomologation · US EPA |
| Fuel economy (city)Higher is betterLower L/100km is better; higher mpg is better — direction is on the canonical L/100km. | 14.0 mpgHomologation · US EPA | 17.0 mpgBestHomologation · US EPA |
| Fuel economy (highway)Higher is betterLower L/100km is better; higher mpg is better — direction is on the canonical L/100km. | 19.0 mpgHomologation · US EPA | 24.0 mpgBestHomologation · US EPA |
| Fuel tank capacity | 14.3 galManufacturer claim · Porsche | 18.0 galManufacturer claim · BMW |
| Estimated range (combined)Higher is betterEstimated from tank capacity and quoted combined economy — not an instrumented range. | ||
| Practicality | ||
| Cargo volume | — | 12 ft³Manufacturer claim · BMW |
| Seats | 2Homologation · US EPA | 4Manufacturer claim · BMW |
| Pricing | ||
| Base price (as tested market)Demo prices only; not live FX. | $160,700Homologation · US EPA | $117,000Homologation · US EPA |
| Tires & Wheels | ||
| Front tire size | 245/35 ZR20Manufacturer claim · Porsche | 245/35R20 95Y XLManufacturer claim · BMW |
| Rear tire size | 295/30 ZR20Manufacturer claim · Porsche | 275/30R20 97Y XLManufacturer claim · BMW |
Every figure is the car’s preferred, sourced value. “Best” marks the strongest value in a row, judged on the canonical measurement (so a winner is correct whichever unit system you view). Open a car to see each value’s source, original units, and alternates.
Community index
Add a value with its source. An editor verifies every submission against its citation before it appears on the site.
| Quarter-mile trap speed |
|---|
| 127.0 mphIndependent test · Car and Driver |
| — |
| FrontManufacturer claim · BMW |
| Induction type | Naturally aspiratedManufacturer claim · Porsche | Twin-turboManufacturer claim · BMW |
|---|
| Redline | 9000Manufacturer claim · Porsche | — |
|---|
| Transmission type | Dual-clutch (PDK)Manufacturer claim · Porsche | Torque-converter automaticManufacturer claim · BMW |
|---|
| Number of gears | 7Manufacturer claim · Porsche | 8Manufacturer claim · BMW |
|---|
| 228 miCalculated |
| 342 miBestCalculated |
| Estimated range (highway)Higher is betterEstimated from tank capacity and quoted highway economy — not an instrumented range. | 271 miCalculated | 432 miBestCalculated |
|---|
| Estimated range (city)Higher is betterEstimated from tank capacity and quoted city economy — not an instrumented range. | 200 miCalculated | 306 miBestCalculated |
|---|