I8 Roadster vs Z4 M40i

BMW · BMW

1/4 Mile winner

I8 Roadster

Beats the Z4 M40i by 0.00s

The verdict

In a quarter-mile drag race, the I8 Roadster beats the Z4 M40i by a hair, finishing 0.00 seconds ahead. It's tight on paper, but our simulator gives the edge to the I8 Roadster thanks to a slightly better power-to-weight balance.

Spec head-to-head

Power

369 hp

382 hp

0–100 km/h

4.4s

Top speed

250 km/h

Engine

ELECTRIC MOTOR

3.0L Turbo I6

Fuel

Hybrid

Petrol

Torque

570 Nm

500 Nm

Price

$165,000

$68,000

Simulated race times

Distance

I8 Roadster

Z4 M40i

100 m

5.511s

1/8 mile

8.173s

1/4 mile

12.348s

1 km

22.372s

Acceleration curves

Who should buy which?

Price: Z4 M40i is $68,000 vs $165,000 for the I8 Roadster — a $97,000 gap. Power: Z4 M40i makes 13 hp more (369 vs 382).

FAQ

Which is faster, the I8 Roadster or the Z4 M40i?

In our simulated 1/4 mile drag race, the I8 Roadster is faster, beating the Z4 M40i by 0.00 seconds.

What is the 0–100 km/h time of the I8 Roadster vs the Z4 M40i?

The I8 Roadster hits 100 km/h in 4.4 seconds, while the Z4 M40i does it in 4.4 seconds.

How much horsepower does each car have?

The I8 Roadster produces 369 hp; the Z4 M40i produces 382 hp.

What are the top speeds?

The I8 Roadster tops out at 250 km/h, and the Z4 M40i reaches 250 km/h.

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