Back in May we were telling you that a tune for the BMW i8 is now available from the guys over at BR-Performance. While little was known about how it worked or the exact horsepower figures you could reach for your plug-in hybrid BMW, today we get more details from the Belgian tuner. Apparently, they can reach a variety of power levels and it only takes about 4 hours to get your i8 pumped.

In a new video published on its Youtube account, the tuner describes its Stage 1 tune as ‘safe’ and claims that the combined power of the BMW i8 can reach 400 HP and 650 Nm (479 lb-ft) of torque. Considering that in standard guise the car has 362 HP and 570 Nm (420 lb-ft) of torque at its disposal, these new figures are rather impressive.

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That’s especially true when you consider the fact that no other tuner has been able to crack the system on board the i8 and offer an alternative. Apparently, according to the guys from BR-Performance, the car uses the same DME as the 1.5-liter 3-cylinder engine on other BMW and MINI models but it was a lot better hidden from prying eyes. Getting to it solved half the problem, while upgrading the ECU map solved the other half.

The same guys are claiming that even further power increases are possible but they are a bit more risky. Reaching a total output of 428 HP and 718 Nm (530 lb-ft) of torque is doable and is absolutely stunning performance for a car with this kind of hybrid powertrain. With the lightweight construction the i8 has and its intelligent all-wheel drive layout, these figures put it in supercar territory without even trying too hard. To top everything off, the Stage 1 upgrade costs only 890 Euros.