• Feb 15, 2010
Hartmut Feyhl's Renntech C63 – Click above for high-res image gallery

Looking over the pantheon of fast cars around the world, Mercedes-Benz and its AMG-tuned models are always near the top. But there's always room for improvement, right? Enter Renntech, the Florida-based tuning company that's been eking more and more power from the German automaker's wares for over 20 years.

Renntech just informed us of two new world records that its vehicles were able to set, the first by a customer and his CL65. The powerhouse machine used its ECU/TCU upgrade, ram air system, intercooler upgrade, high-flow exhaust and limited-slip differential to good effect, hitting a quarter mile pass of 10.62 seconds at 133.7 miles per hour to earn the title of the World's Fastest CL65.

Next up was Renntech owner Hartmut Feyhl, who's modified C63 (using undisclosed prototype products) ran down the quarter in 11.6 seconds at 125.3 mph. That impressive showing was enough to earn Feyhl the Worlds Quickest Trap Speed for the C63. Congrats on the effort, Renntech. Click past the break to watch a video of the record-setting CL65 as it streaks down the track.



[Source: Renntech]



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RENNtech, the internationally recognized leader in Mercedes-Benz AMG tuning, has 20+ years of experience in developing the world's fastest AMG vehicles to claim the streets.

Two separate 1/4 mile records were made by two very impressive RENNtech cars at Palm Beach International Raceway on Wednesday February 10th, 2010.

The first record was made by a customer's CL65. The vehicle was recently upgraded with newly developed RENNtech modifications which created substantial power and torque improvements. A World Record quarter mile pass of 10.62 seconds @ 133.7 mph was clocked on the cars final pass of the night.

While everyone was celebrating the CL65's record pass, Hartmut Feyhl, owner of RENNtech, set a new record with his very own C63. The vehicle is fully equipped with RENNtech engine, driveline, suspension, and braking modifications, as well as a few other prototype products under development. Hartmut ran 11.6 seconds @ 125.3 mph, which is the Worlds quickest trap speed recorded for the C63.


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    • 1 Second Ago
  • 18 Comments
      invisiblepigeon3
      • 4 Years Ago
      I think a lot of people are missing the point... The CL is an ultra luxury grand tourer. The fact that it can do a 10 sec 1/4 mile is impressive, when comparing it to drag cars, but doubly impressive considering it's a luxury car. That CL was probably my favorite ever, and one of the best looking MB's ever too. The new one looks bloated by comparison.
        • 4 Years Ago
        @invisiblepigeon3
        This really depends on perspective. Thinking of it as a big, heavy, expensive, luxury GT car, yes 10.6 is damn fast. But thinking of it as a drag car, 10.6 is slow for that kind of money and displacement.
        How impressive it is depends on the light you look at it in.
      • 4 Years Ago
      Could that CL be the fastest recorded (street driven) MBenz 1/4 mile ever? I didn't Google it, so don't rag on me if it's not.
      • 4 Years Ago
      The cobra in the other hand was gorgeous and probably run a mid 11 time.
        • 4 Years Ago
        @Geeky1
        Judging by your name one would expect more intelligence coming from you, but in reality all you do is spout ignorance. Any point you make is invalidated by the fact that you point out things that you obviously have no idea about. The last Mustang produced that didn't have air conditioning was the 2000 Cobra R, not the 03/04 Cobras. And I guess I'll just have to "suffer" with a Mach 460 sound system that has three amplifiers, four woofers, and four tweeters. I would expect a Mercedes with a wheelbase ten inches longer to have more room.
        An 11 second pass is on the slow end of Cobras nowadays. Every Cobra owner I've met runs anywhere from 11.7 to 10.5. The Cobra the AMG was racing was obviously on street tires or worn DRs since it pulled a 2 second 60 ft. You can spend less than $10k and have them running 9s with full interior.
        Questionable build quality? How many cars have you owned that have hand-built motors inside of them?
        What's the point of paying $200k for a car when you can build a car that will outperform it on the road course and at the strip for thousands less?
        arturo was just saying that he liked the Cobra, but you had to respond with an attack on a car that beats up on Z06 Corvettes with minimal mods. You are the typical elitist douche that thinks that just because you pay X amount for a car, that it is automatically better than everything else.
        • 4 Years Ago
        @Geeky1 -

        Amen, brotha. A Cobra and C63 are similar in that they are cars with powerful engines, and that's about where the similarity ends. German cars are just superior in overall quality, refinement, engineering, luxury, etc. to any American car. I don't think anybody can come up with a legitimate argument to the contrary.

        Yes, a Cobra is fast and will beat the C63. But it's not just about speed. "It's not how fast you go, but how you go fast."
        • 4 Years Ago
        @ Dan:
        I know! And one of them called me a-a *sniffle* "piece of shi#$t" too!! *sob* I-I-I be-better just *sniffle* s-stop talking ri-ri-right n-now *gasp, sob* or the-the-they might s-start calling me re-really ba-bad names li-i-ike d-d-d-douchen-n-nozzle a-a-and s-stuff! *cry*

        *snicker*

        I don't know what it is about some cars that seems to make them so attractive to insecure little people that suffer from a severe deficiency in critical thinking abilities. Mustangs, F-bodies, 3 series BMWs (I hate to say it, being that I am a German car person and all, but they belong here too) and most FWD "sport" compacts all seem to exert this almost magnetic pull on delusional twerps with self-esteem issues.

        That's not to say that there are no real car enthusiasts driving Civic Sis, 335is, Trans Ams, Mustang GTs, etc. Of course there are. There are plenty of people that drive all of the above, that take them to the track and beat the hell out of them and love every second of it. More power to 'em; 3 series are wonderful cars, and they're a blast to drive. I'm sure that if you can ignore the interior and the build quality, the Cobra is too. Civics probably are as well, if you like having all your power above 6000rpms and don't mind the handling characteristics imparted by wrong whe-er, front wheel drive.

        But for every Mustang/Camaro/Civic/etc. driver I meet that I can actually talk cars with, I meet at least 2 or 3 that insist that their (whatever) is God's gift to car enthusiasts. You know, the "yeah, well, the Z06 sucks because my Civic makes 100hp per liter" / "ROFL 911 GT2, I went around the Nurburgring faster than that POS in my modded IROC on Forza last night. Who would pay $200k for that hunk of crap? Porsches suck." people...That special group of ex-short-bus-kids that are prone to insisting that they just drag raced a GT500 in their clapped out 318ti with 225,000 miles and a coolant leak from the thermostat housing and won. By a mile.

        And of course as soon as you point out anything about the object of their obsession that threatens to crack the lenses in their rose-colored glasses, they get all butthurt and start flinging poo. It's sad. If it weren't for those people, most of the cars that they so adore would be a lot more respectable than they are now.

        @ AudiS4: I agree with you wholeheartedly, with one exception. The 2nd gen. CTS-V. I drove one and my only real complaint was less-than-ideal pedal spacing for heel and toe downshifts. The stereo is still Blows-er, Bose-garbage, the pop-up nav screen is stupid, and I don't like the glossy black trim on the console, but the car drives very, very well. As well as any Mercedes, BMW or Audi I've ever owned or driven. It's one hell of a car; I'd actually buy one before I bought a M5-though I'd buy an E63 before either. But other than that one car, I couldn't agree more.
        • 4 Years Ago
        ---Judging by your name one would expect more intelligence coming from you, but in reality all you do is spout ignorance. Any point you make is invalidated by the fact that you point out things that you obviously have no idea about. The last Mustang produced that didn't have air conditioning was the 2000 Cobra R, not the 03/04 Cobras.

        I meant to throw a "decent" in there before "air conditioning", and I thought I did, but apparently I didn't. Judging by your response though, my comment must have hit a nerve, since you couldn't manage to utter a single sentence without resorting to ad hominem attacks.

        ---And I guess I'll just have to "suffer" with a Mach 460 sound system that has three amplifiers, four woofers, and four tweeters. I would expect a Mercedes with a wheelbase ten inches longer to have more room.

        I've heard the Mach systems. They're garbage. They're better than Blows-er, Bose-but that's not saying a whole lot. If you really believe that the quantity of amps and speakers is in any way indicative of sound quality, you're a fool.

        ---An 11 second pass is on the slow end of Cobras nowadays. Every Cobra owner I've met runs anywhere from 11.7 to 10.5. The Cobra the AMG was racing was obviously on street tires or worn DRs since it pulled a 2 second 60 ft. You can spend less than $10k and have them running 9s with full interior.

        That's great. I never said they were slow. I never said the CL was faster than a well-built Cobra. I'm quite well aware of how fast the cars can be made. You know what else is fast? A riding mower with a LS7 bolted to the front. Again, what's the point of going fast if the car you're doing it in is a turd?

        ---Questionable build quality? How many cars have you owned that have hand-built motors inside of them?

        Five. Also, your argument makes no sense. The engine isn't a problem. I'm not a Ford fan by any stretch of the imagination (as I'm sure you've gathered, their cars are more than a little bit plebian for my taste) but the modular V8 is a solid engine. It's the rattly interior, the cheap plastics, and the lack of attention to details like the mold release lines for the plastic door panel that run right across the top of the door panel next to the window felts where you'll feel them every time you rest your arm on the door (although it was a newer Mustang that had that affliction, I haven't bothered to look at one of the same generation as the one in the video. I doubt it's any better; considering the recent improvement in Ford's products, it's probably worse). Everything about the car except the drivetrain screams "cheap piece of crap." Why? Because, well, that's what the rest of the car is.

        ---What's the point of paying $200k for a car when you can build a car that will outperform it on the road course and at the strip for thousands less?

        As I've said, it's not just about speed. A built Cobra that cost $40k would probably smoke the CL65 without breaking a sweat. It'd also remind me every second that I spent behind the wheel that I was driving a cheap car; the aforemenetioned road noise and rattles, the heinous design of the dashboard and the materials it's made out of-everything about it just screams cheap. Is a car that'll make it to 150,000 miles without developing a single squeak or rattle worth $200k to you? Is a leather covered dashboard worth $200k to you? Massage seats? An alcantara headliner? The ability to cruise effortlessly at 150mph the way most cars go down the road at 65? If all you want is to go fast, the Mustang is a fine car. I expect more than that out of my cars.
        See, the thing is, my commute doesn't include any drag strips or road courses. About the only thing I have to deal with is the occasional malcontented lemming in a Camry/Accord/Sebring/whatever that's somehow threatened or something by sitting next to a car that cost more than they'll take home in the next few years, that's going to "stick it to the man" or whatever it is that goes through their diminuitive minds by getting to the freeway on-ramp before I do. I don't need to run 9s in the 1/4 to put them in their place. I do, however, appreciate being able to remind them of where they belong while in a state of complete relaxation. Cars like the CL excel at that; cars like the Mustang... not so much.

        ---arturo was just saying that he liked the Cobra, but you had to respond with an attack on a car that beats up on Z06 Corvettes with minimal mods. You are the typical elitist douche that thinks that just because you pay X amount for a car, that it is automatically better than everything else.

        You're proving my point; that the Cobra is a cheap, single-purpose car. That's fine, if all it takes to get you off is going fast. Saying that it's good for anything else is like saying that
      • 4 Years Ago
      BTW, i'd also like to add, that was the most boring 10 second 1/4 pass i've ever seen. Just about as exciting as watching a Greyhound bus running it.
        • 4 Years Ago
        IMHO thats how all drag racing is.... No turns = fail IMO..
      • 4 Years Ago
      Dan, that's just your opinion I guess. Different type of racing for different tastes. I can go on all day about why I think F1 is(or was, Drama b.c) better than Nascar/Indy all day, but in the end, it's just my opinion.

      I like drag racing and road racing. Luckily I have a car that's great at both.
      joe
      • 4 Years Ago
      As the name implies it's obvious where my bias lies. I'm not looking to bash or defend anyone in particular, but as a middle class guy that has to work extra and my wife work also works to have a nice house, decent vehicles for us to drive and dig up a little extra to biuld a nice respectable progect, not all of us can justify to ourselves buying, or able to, an AMG, 911, BMW M, Audi S. I'm not going to pretend that Im not a fan of most, or that I wouldn't own most if given the chance., but maybe when you budget is lower you just gotta build the best thing that you like that fits budget/ lifestyle! Does my mustang ride rougher, not as fast, not as luxurious, yes absolutely, but I love that " piece of crap" . Sometimes a little rough and raw is fun too (e30 m3, 930turbo). The mustang, camaro challenger can't be the the exotic, duh, that's why it's called exotic. We can't all have one.personal taste has to mean something. I like American, euro, Asian. All have pros and cons. Makes me diverse that's all. Everyone should learn to appreciate more things.
      • 4 Years Ago
      ...its akin to having a civic thats faster than a ferrari. At the end of the day, you're still going home in the econobox.
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