• Apr 12th 2007 at 4:59PM
  • 6
We know that Mercedes used the SLR 722 badge on the SLR McLaren 722 Edition to honor the 1955 Mille Miglia-winning Mercedes-Benz 300SLR of Stirling Moss and Denis Jenkinson, but still. That car, wearing a big "722" on the doors, which indicated their 7:22am start time, managed to beat the favored Porsches and Ferraris back in the day. But people see a 722 on the label and somehow 650 hp doesn't seem good enough. Enter, supertuner Renntech.

Renntech takes the supercharged 5.5-liter V8 that resides in every SLR and adds some of its magic. This time it's a simple application of one of the company's upgraded intercoolers and a new intercooler pump. These revised units have twice the capacity of the stock coolers and reduce temperatures by a full 50 degrees. The result is horsepower that now hits the magic 722 mark. No price is listed for the conversion, but it sounds like it could be a real winner with the few customers lucky enough to have a 722 parked in their garage. We could do without the aftermarket wheels though.

[Source: MotorAuthority]

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    • 1 Second Ago
      • 8 Years Ago
      What is there to get about the SLR? It's meant to be a fast car.

      SLR vs 599GTB

      SLR vs Carrera GT

      SLR 1/4 mile @ 11.4

      With this bump in HP it will be a 10 second car.
      • 8 Years Ago
      With all of McLaren's and Mercedes's resources, expertise, and a half million dollar plus price tag, you would think they would fit the SLR with the best intercooler imaginable. Nope. How about after the car has been out for a few years and it was time for the tweaked special edition 722? Nope. I'd be pissed. I rather have a Pagani Zonda F.
      • 8 Years Ago
      I'm with #2 on this one, intercooler upgrade yields 72h.p., doubtful.
      • 8 Years Ago
      "What is there to get about the SLR? It's meant to be a fast car." What has fast got to do with it being poorly styled (and overstyled)? And for a car with an aluminum engine and a composite and aluminum honeycomb chassis, why is the thing so damn heavy, given that it's supposed to be fast. The Mclaren F1 is a much older design that manages to be both much lighter and much faster. Even the Porsche supercar weighs half a ton less.
      • 8 Years Ago
      So, all they did was upgrade the intercooler and pump and they bumped up the horsepower significantly. No change to the ECU at all? I'm just curious, cause maybe I could do that to my supercharger kit too.

      • 8 Years Ago
      Custom ECU programming, special crankshaft pulley, 2 very large intercooler pums. Lots of dyno time. Difficult intallation
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