Renntech once again takes the Mercedes-AMG A45 from pocket-rocket to ballistic missile

Dealing with the car industry for so long, we learned the only valuable lesson one needs to know when it comes to tuning: some people will never be satisfied with a stock car’s oomph, be it a fully-fledged performance vehicle created by one of the world’s most revered divisions around the most powerful turbocharged four-cylinder engine currently in series production… in the world.

German tuner Renntech, who’s been tweaking AMGs since 1989, had a stab at the new Mercedes-AMG A45 which, by everyone’s standards, was doing just fine in stock form. The result sees the lava-hot hatch churn out up to around 600 horsepower, but lighter tuning kits are also available if you don’t need that kind of ego boost.

0[Not Quite Double the Horsepower but Double the Fun0

Renntech Can Push the Mercedes-AMG A45 Up to Nearly 600 Horsepower
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A factory-spec Mercedes-AMG A45 makes do with 382 horsepower and 354 pound-feet of torque. Get the S variant and you’re served with 416 horsepower and 369 pound-feet of torque.

The current A45’s front-placed engine is mounted longitudinally instead of transversally, so the turbocharger and exhaust manifold ended up in the back, near the firewall.

This allowed Mercedes-AMG to extract more power out of the mill and provide better cooling. It also looks like tuners dig this new layout.

Renntech is currently applying the finishing touches on a software tweak that can raise the A45’s power output to 468 horsepower (475 PS) and 424 pound-feet of torque (575 Newton-meters). On top of that, the tuner plans to offer two more upgrade stages of 542 horsepower (550 PS) and 591 horsepower (600 PS), respectively.

Here’s a video of the Renntech-imbued A45 on the dyno:

For the bigger picture’s sake, the Ford Mustang Shelby GT350 cranks out 526 horsepower, but that’s coming from a 5.2-liter V-8. The BMW M550i xDrive packs 523 horsepower, again from a V-8 (albeit smaller than the Shelby’s, capped at 4.4 liters, also twin-turbocharged).

Heck, the M5 sedan makes 600 horsepower and Renntech’s top-dog A45 would only be nine horsepower short.

Let that sink in.

Unfortunately, Renntech doesn’t detail how the power and torque bump would affect the AMG A45’s sprint time and top speed. The stock car is already blistering quick from a standstill; the S needs just 3.9 seconds to 62 miles per hour (100 kilometers per hour) and it can keep going to a top speed of 168 miles per hour (270 kilometers per hour). For now, we can only dream of what the newfound grunt will do to alter these figures. Useful to know, however, these upgrades will arrive a tad later, during the first quarter of 2020. That’s because they imply more than just your casual software tweak, forcing Renntech to bring in a modded turbocharger and a new exhaust system.

Renntech Can Push the Mercedes-AMG A45 Up to Nearly 600 Horsepower
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Not much to talk about aesthetically, except for a new set of 19- or 20-inch aluminum wheels, cast or forged. Somehow, we like the idea of a sleeper Merc-AMG A45 that would force fellow drivers into confusion in a traffic light drag race: should they pick up their jaws first? Should they even bother accelerating? Should they buy a scooter and just forget about cars for a while?

Tudor Rus
Assistant Content Manager - Automotive Expert - tudor@topspeed.com
Tudor’s first encounter with cars took place when he was only a child. Back then, his father brought home a Trabant 601 Kombi and a few years later, a Wartburg 353. At that time, he was too young to know how they worked and way too young to drive them, but he could see one thing – each of them had a different ethos and their own unique personality. As time went on, he started seeing that in other cars as well, and his love for the automobile was born.  Read More
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