This Custom AMG GT R Is Insanely Powerful

This Custom AMG GT R Is Insanely Powerful

This custom Mercedes-AMG GT R has got more power than some supercars.

The Mercedes-AMG GT R is already a very fast car. Powered by a 4.0-L twin-turbo V8, it puts down 577 hp and 525 lb-ft of torque. Zero to sixty is done in just 3.5 seconds on its way to a top speed of just under 200 mph.

That is to say the GT R is fast. But it could be even faster.

Renntech is a German tuning company that saw the true potential in the AMG GT R. The took the Mercedes, nurtured it, and then ripped it apart and put it back together with new equipment.

To start, the normal turbochargers are gone and in their place are a pair of turbos of Renntech’s own devising. There’s also a new set of exhaust downpipes and the ECU has been tweaked to deal with the car’s increased power.

How much more power? About 750 horses worth. This is a powerful car.

To help this custom beast stop, a new set of two-piece vented brakes were installed along with a steel brake line. Bilstein suspension improves handling, while the same 7-speed dual-clutch returns from the original car because it’s very hard to improve on a perfect transmission.

All these tweaks combine to create quite possibly the best GT R ever made. It can easily hang with the big boys, which is why Renntech took their creation to the Nurburgring to find out how well it zooms.


They place professional GT3 racer Andreas Simonsen behind the wheel, who normally drives the GT R racing-spec version so this wasn’t too much of a departure for him.

However, Renntech isn’t a huge carmaker like Mercedes, so they weren’t able to close down the entire course to see how fast their creation could go. This meant there were plenty of regular joes running around in Porsches and BMWs and just generally getting in the way.

You can see in the above video that Simonsen had to slow down several times to avoid plowing into the back of a Porsche 911. He was leaving everyone in the dust, but those obstacles definitely cost him some seconds in his run.

The Renntech GT R posted a time of 7 minutes and 4 seconds, which is a full seven seconds faster than the regular GT R, and Mercedes had the benefit of being able to clear the track. If Renntech could afford to rent out the whole Nurburgring for an hour they’d surely post an even faster lap time.


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