Dear Jesse,

Thank you for getting the ECUs back to me on time.

With the new ECUs the transformation of the car is like magic! Improved drivability, better throttle response, and amazing power. This is how the car should have been built by Bentley!

Can you believe that at 2000 RPM I am doing over 70 MPH? Again, truly amazing and thank you.

V Best wishes,

K=

2011 Bentley Flying Spur

Jesse,

Just want to follow-up, the difference in the car is amazing, it was hard to keep it below 80 on the way home. Thanks,

Jim B.

E 550 Biturbo (W212)

Hello Tomas,

Thank You for getting my ECM back to me Soo quickly. I was one hell of a happy camper when I walked into my office Friday afternoon and saw a box from "Renntech" sitting on my desk!

I had a family obligation up about an  hours drive on pretty open and also some windy/hilly roads. I shot home dropped the ECM into my machine and off I went. WOW! The best way to describe the difference is, "The Inner Beast" in her has really been awakened and she still behaves Soo well. I had my wife with me so it wasn't just me and "The other woman". However I am extremely happy with the improvements you guys made.

Passing on a two lane road: She always had a great ability to pass quickly when crossing over thelines to get by "Grandpa Jenkins" and now when I punch it at 45 mph and blow around Grandpa-we come back into our lane at about 115mph. Before hand she was no slouch probably around 90-95mph.

I will have much more time to play with her over the next week and I will keep you updated. Please pass my gratitude on to the rest of your team. Not only did you guys deliver what you promised, you did it with class. You run an impressive operation, everyone I spoke with was courteous, professional and very informative.

Thank You Very Much Tomas. May you have countless days of continued successes.

Talk to ya soon. Thanks Again!

Respectfully,

Jerry M.

2012 (C218) CLS 63 Biturbo

Hi George & Team,

Just wanted to let you know the ECU arrived to my house as scheduled this morning. I installed it immediately and took the car for a drive. All I can say is, HOLY SMOKES! The car drives stock-like at partial throttle, but press the pedal to the floor and it's like an entirely different animal!

The tires even break loose when going WOT on the freeway at speed! Needless to say, I'm very impressed, and can't thank you guys enough for your great customer service and top-notch product.

I will let you guys know how the car performs at the Airstrip Attack event next month, hosted by Shift-Sector. I also plan the get the car re-dynoed later this week to see what kind of power it's now putting down.

Oh, and thank you also for throwing in the BMC air filters, that was a nice touch.

I look forward to doing more business with you in the future.

Eric F.

2012 E63 Biturbo (W212)

Dear George,

I wanted to take the time and share my satisfaction with the results f the tuning of my 2008 CL 65. Not only did you deliver on your original prediction on HP and torque, but exceeded it by 50 on HP and 100 Lb/ft on torque. I'm now at 715 HP and 965 TQ. The end result is a huge improvement from its original base line in both power and torque.

You guys hit it out of the ball park and delivered well above your original prediction.

Sincerely,

Manny V.

2008 CL 65 (C216)

Guys,

I wanted to take the time and write you about my thoughts and satisfaction on the RENNTech V3 Lowering module for my 2010 W212 E550 Sport sedan, equipped with AirMatic suspension. I work in an office environment in Orange County, CA and use this car as my daily driver to haul both my 2 year-old daughter and clients around, although not both at the same time.

I purchased the E550, which is black on black, with the idea of doing mild modifications that were both sporty and street friendly. These mods would include lowering, exhaust, ECU tuning, window tint, 19" wheels and some interior accents. My previous cars were a CLK55 AMG and BMW M3 and have had my share of potholes and rough ride quality.

When doing my research for the lowering module, I, like many others, took to the Internet. As you know, there is a lot of noise out there. I decided that if I was going to use a lowering module for my E550, I wanted to go with a reputable, Mercedes-tuner, with a quality reputation and a name for performance. This dwindled my short list to RENNtech and Brabus.

The Brabus module was fixed, meaning it did not offer any choices of custom lowering heights. I decided to call you guys and Tomas and George were extremely helpful. They always picked up the phone and were more than generous with their time answering my questions. In this day and age of call centers and poor service, these guys were 5-star and one of the reasons I felt comfortable with the unit and decided to go with RENNTech. It's everything that it's advertised to be and I am extremely happy with the results. Easy, quick install, done by the authorized RENNTech dealer HG Motorsports in La Jolla, CA. The software was easy to download on my laptop and very user-friendly. I was able to customize my 3 settings quickly. I call them Mild, Sport and Aggressive Drop. The pictures of my car are with my mild setting, which is -.75" in front and -.70" in rear.

Thanks again for producing a quality unit and for all the support and help. I'm going for the RENNtech ECU tune next!

--
Stephen

2010 E550 (W212)

Tomas-

Again I would like to thank you and the entire RENNtech team for a great job on my car...it runs fantastic and I am thrilled. I can't tell you how much I enjoyed the tour of your facility...very impressive...also please tell Hartmut how much I enjoyed chatting with him and looking at adapting my exhaust....hard to find anyone who can knows as much about Formula 1 as he does...love it.

Phil M.

2003 SL600

Hi Bob,

Made it back to Houston.  The car worked perfectly.  I hope that continues for the next few years.

Please thank the RENNtech team for taking time for me on Monday.  

Please be sure to thank Harmut for me as well.  I really enjoyed the facility tour and his explanation of the technology.

Thanks for the tee shirt.  I will wear it with pride.

Brian L.

2011 Mercedes S65 (W221)

George,

Wanted to let you know that the tune is done, and the car feels incredibly fast. I plan on putting it on a dyno shortly, but it is a monster!!! Amazing result, I could not be happier.

I will share the final HP and TQ results.

Thanks,

Dmitry

2012 CLS 550

Bob,

I got enough of a run to the motorway to heat the engine before opening it up and initial feel was fierce, I actually spun the wheels with kick down it at 90mph, that is just incredible. Now I have the car performance that I was after when I bought the 63! Keeping my eyes peeled on the motorway for anyone brave enough to have a go.. ;)

Thanks,

Mike

2012 CLS 63 Biturbo (C218)

OH HELL YEAH!

Definitely more pull and revs are higher between shifts....I need something to throw down on to feel the difference better.  Think I will troll for Mustangs and Camaros this evening and work my up to the exotics.....LOL

BIG Thanks Leon!

Dave M

Vehicle: S 65 (W 221)

Bob,

Just installed the intercooler pump and carbon fiber air box. I was more than pleased to see a noticeable jump in power and throttle response. It has been my experience that on engines of around 500hp you are going to have to have an increase of at least 25-30hp to notice any difference. I am very happy with the results. Thanks for your help.

Best regards,

Jack S.

SL 55 (R230)

Took 'er out on 95 the other day-and wow!  Exactly what I wanted.  When you jump on it at speed, like 70 or so and hammer it, the exhaust becomes glorious and sounds like Parnelli Jones in his ‘69 Boss Trans-am car. #15 in your program.

Please tell Harmut it’s perfect and was just what I wanted on the highway.  Thank you guys.

Jeff S.

E 55 Wagon

I have 2008 C63 which I bought May of 2008. I was one of the first few to own C63 in Canada. For the first 2 and a half years I had it stock and was quite satisfied with the power but as time went on the urge to see the true potential of this car over came me and I got the tune.

I went through the same dilemma as you on what tune to get, but I settled with Renntech basically because their very reputable company with a quality product. That being said the Renntech tune is one of the more expensive tunes. However now that I have been driving it for a few days it was worth it. The car pulls so hard its ridiculous. C mode now with the tune feels like S mode stock and S mode tuned.......out of this world!

I specifically asked for a 93 octane tune which renntech informed me was generally what they do with their tunes. We have 94 octane gas up here in Calgary Canada at our Husky stations so I believe it helps. Renntech claims 517hp and 485Ft/lbs from crank on their website but I think this is conservative. I hope can find a dyno and see what power Im truly putting down. Any way its worth it whatever tune you get but for me Renntech was the best choice because it gave me peace of mind that they do great job and my engine wont blow up.

posted by bpppp

via mbworld.org forums

Mr Brady,

Just to let you know we installed the ECU on Saturday and the C is now another beast. I cant Thank you enough for your patience and help. Am sure Ill get a few friends to go the Renntech way after they try out my cousins C63.

Thanks for all

Jose S

Korey,

I wanted to circle back around with you and thank you for helping me with the purchase of your sound pipes for my 2008 CLK BS. I love the sound, in my opinion, it’s really how it should have sounded from the factory.

Thank you,

Todd

As you may remember, I have a '92 E500 with the 6.0 conversion. The reliability of that car, and the fact that after 4 years no Renntech part has given me any difficulty, have led me back to your door.

I just ordered and install the ECM upgrade and pulley kit on my new SLK32. The whole process worked well, from the quick turn around to very good instructions with pictures that showed how to install it. The preformance improvment is very good with no noticable downsides except perhaps rapid rear tire wear ... but that can be addressed with a driver upgrade!

Anyway, I would be happy to speak to anyone about this upgrade and am pleased to install this or other upgrades in my shop. Thanks again and the 1/4 mile improvment was from 13.01@107 to 12.72@109, despite a 30 degree higher temp.

Jake

Gentlemen, thanks for getting me in and taken care of so quick. The car really gives a nice push in the back now. It's startling the way this car builds up speed and awfully deceptive.

Thanks again,

Jason Nunemaker