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    RENNtech ECU Tune: The Cure For What Ails You

    I just what to relate my experiences with a recent RENNtech ECU tune for my 2012 CLS550 4Matic. I've been researching and considering a tune for a year now, but medical concerns have been a much higher priority. My goals may be different than others... I don't race at all, but simply wanted a reliable and efficient street tune. I wasn't worried if I didn't have the most horsepower... I crave usable street torque. In the end, there were many qualified tuners to choose from, but I selected RENNtech based their years of experience, excellence in engineering, and close relationship with Mercedes Benz.

    Since I have some decent mechanical skills, I opted to remove the ECU myself. This operation is extremely simple to accomplish... provided you can find the battery first (they hide it well). Once the ECU was removed, I sent it to Florida on a Monday afternoon and it was back on my doorstep in Massachusetts by 9:00am on Wednesday. Reinstallation was a snap and the Benz easily roared back to life. Altogether, there was not much down time on the vehicle.

    The initial shakedown cruise was next. In local city driving, there were no adverse issues... it was comfortable and docile in traffic. But when I hit the expressway on-ramp... oh yeah, I began to smile. And squeezing the throttle to merge and change lanes was impressive... it definitely was a new beast. For some strange reason, I remained somewhat skeptical, yet highly intrigued... I wondered just how much the dyno would reveal?

    Fortunately, I had the foresight to do a base dyno nearly a year ago. Recently, I returned to 'Enhanced Street Performance' (ESP) for another Dyno Day. Although the main focus of the day was devoted to Corvettes, the group of guys welcomed me and ESP was first class with their professional service. The dyno used here is a Mustang 1100-SE AWD chassis dynamometer. Though I have no proof, I'm told that measurements on the Mustang Dyno are traditionally about 10% less than a Dynojet. Furthermore, the guys also indicated that this particular dyno was even lower than other Mustang dynos they have tested on. All in all, since this was the same dyno for my base numbers, the overall gains should be accurate.

    Setting up my CLS550 4Matic, the traction control was turned off and the pulls would be done in 4th gear... same as last time. The first dyno run was somewhat uneventful... the tranny was difficult to hold gear and kicked down. With some slight initial feathering, the second pull sounded great and everyone was eager to see the results. I was ecstatic when the huge projection screen spit out the uncorrected readings... 426 horsepower and a whopping 515 lb/ft of torque!

    I could be mistaken, but I don't believe there have been any dyno postings from a CLS550 4Matic in the past. Since this is an AWD vehicle, I estimate drivetrain loss at between 15-20% (though MB is very efficient). Therefore, I feel crankshaft figures are a good 500HP and over 600 lb/ft of torque... utterly amazing on a conservative Mustang dyno.

    Overall, I'm extremely pleased with RENNtech and highly recommend dealing with technical advice from Lenny or sales aspects with Tomas. I'm not sure if medical science will note this, but my RENNtech tune also helps to cure my disability... every time I slam down the throttle. Click here to enlarge

    Regards,
    427

    -----------

    RENNtech ECU Tune:

    Click here to enlarge


    Before & After Results:

    Click here to enlarge


    Dyno Day Video (mostly Corvettes):


  2. #2
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    Click here to enlarge Originally Posted by 427 Click here to enlarge
    I just what to relate my experiences with a recent RENNtech ECU tune for my 2012 CLS550 4Matic. I've been researching and considering a tune for a year now, but medical concerns have been a much higher priority. My goals may be different than others... I don't race at all, but simply wanted a reliable and efficient street tune. I wasn't worried if I didn't have the most horsepower... I crave usable street torque. In the end, there were many qualified tuners to choose from, but I selected RENNtech based their years of experience, excellence in engineering, and close relationship with Mercedes Benz.

    Since I have some decent mechanical skills, I opted to remove the ECU myself. This operation is extremely simple to accomplish... provided you can find the battery first (they hide it well). Once the ECU was removed, I sent it to Florida on a Monday afternoon and it was back on my doorstep in Massachusetts by 9:00am on Wednesday. Reinstallation was a snap and the Benz easily roared back to life. Altogether, there was not much down time on the vehicle.

    The initial shakedown cruise was next. In local city driving, there were no adverse issues... it was comfortable and docile in traffic. But when I hit the expressway on-ramp... oh yeah, I began to smile. And squeezing the throttle to merge and change lanes was impressive... it definitely was a new beast. For some strange reason, I remained somewhat skeptical, yet highly intrigued... I wondered just how much the dyno would reveal?

    Fortunately, I had the foresight to do a base dyno nearly a year ago. Recently, I returned to 'Enhanced Street Performance' (ESP) for another Dyno Day. Although the main focus of the day was devoted to Corvettes, the group of guys welcomed me and ESP was first class with their professional service. The dyno used here is a Mustang 1100-SE AWD chassis dynamometer. Though I have no proof, I'm told that measurements on the Mustang Dyno are traditionally about 10% less than a Dynojet. Furthermore, the guys also indicated that this particular dyno was even lower than other Mustang dynos they have tested on. All in all, since this was the same dyno for my base numbers, the overall gains should be accurate.

    Setting up my CLS550 4Matic, the traction control was turned off and the pulls would be done in 4th gear... same as last time. The first dyno run was somewhat uneventful... the tranny was difficult to hold gear and kicked down. With some slight initial feathering, the second pull sounded great and everyone was eager to see the results. I was ecstatic when the huge projection screen spit out the uncorrected readings... 426 horsepower and a whopping 515 lb/ft of torque!

    I could be mistaken, but I don't believe there have been any dyno postings from a CLS550 4Matic in the past. Since this is an AWD vehicle, I estimate drivetrain loss at between 15-20% (though MB is very efficient). Therefore, I feel crankshaft figures are a good 500HP and over 600 lb/ft of torque... utterly amazing on a conservative Mustang dyno.

    Overall, I'm extremely pleased with RENNtech and highly recommend dealing with technical advice from Lenny or sales aspects with Tomas. I'm not sure if medical science will note this, but my RENNtech tune also helps to cure my disability... every time I slam down the throttle. Click here to enlarge

    Regards,
    427

    -----------
    RENNtech ECU Tune:
    Attachment 30341


    Before & After Results:
    Attachment 30342

    Dyno Day Video (mostly Corvettes):
    http://vimeo.com/64997121
    Absolutely fantastic thread and great results! Especially in the torque column, damn! Well done.

    Will do some formatting changes and have this up on the front page in the next few days. I love when stuff is done in high enough quality that I don't have to mess with much.

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    Congrats and enjoy. Your sentiments about the need for power/torque reflect my views also. No real racing anymore, but a smack down every so often.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Absolutely fantastic thread and great results! Especially in the torque column, damn! Well done.

    Will do some formatting changes and have this up on the front page in the next few days. I love when stuff is done in high enough quality that I don't have to mess with much.
    Thanx for the kind words, Sticky... just trying to help those that might be contemplating a tune.

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    Click here to enlarge Originally Posted by yage202 Click here to enlarge
    Congrats and enjoy. Your sentiments about the need for power/torque reflect my views also. No real racing anymore, but a smack down every so often.
    Agreed, not all of us race... but an occasional romp is phun. Click here to enlarge

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    Click here to enlarge Originally Posted by 427 Click here to enlarge
    Agreed, not all of us race... but an occasional romp is phun. Click here to enlarge
    Hi 427! Thanks for your kind review & for choosing RT for your CLS550 4matic tune. Wish you get better in your health & enjoy your new drive experience Click here to enlarge.

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    Click here to enlarge Originally Posted by 427 Click here to enlarge
    Agreed, not all of us race... but an occasional romp is phun. Click here to enlarge
    Great results ! So what was your exact peak hp/tq stock? what were the delta gains?

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    Click here to enlarge Originally Posted by ezec63 Click here to enlarge
    Great results ! So what was your exact peak hp/tq stock? what were the delta gains?
    Here you go for the M278 V8 4.6L biturbo (US MB550 or Euro MB500) crowd:


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    Click here to enlarge Originally Posted by m54b25 Click here to enlarge
    Hi 427! Thanks for your kind review & for choosing RT for your CLS550 4matic tune. Wish you get better in your health & enjoy your new drive experience Click here to enlarge.
    Thanx for all your tune assistance and well wishes on my health... I appreciate it.

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    Click here to enlarge Originally Posted by ezec63 Click here to enlarge
    Great results ! So what was your exact peak hp/tq stock? what were the delta gains?
    Delta gains... delta gains... hummm, you are exposing my lack of technical knowledge (ok, I'm kinda stupid <g>). I'm aware that Delta makes nice power tools and I've flown on Delta Airlines in the past... but I'm guessing thatz not what we are discussing. Click here to enlarge

    Looking at the dyno sheet that I posted, the horsepower figures are in RED and the torque is in BLUE.
    At the bottom of that graph, MAX figures (corrected) are as follows:
    HP: Went from 385 to 424
    TQ: Went from 419 to 510

    Sorry that I have no clue how to read these any better... perhaps others can elaborate more.

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    Click here to enlarge Originally Posted by m54b25 Click here to enlarge
    Here you go for the M278 V8 4.6L biturbo (US MB550 or Euro MB500) crowd:
    Nice video... I like the lowered stance and wheels.

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    Article: BenzBoost member reviews his Renntech 2012 CLS550 4Matic (all whee drive) ECU tune software + before/after dynograph


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    1 out of 1 members liked this post. Reputation: Yes | No
    Promoted to front page.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Promoted to front page.
    I'm honored... THANX! Click here to enlarge

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    1 out of 1 members liked this post. Reputation: Yes | No
    This is going to sound a little silly, but how is your fuel economy doing? Do you have any warranty concerns?

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    Click here to enlarge Originally Posted by GoBlando Click here to enlarge
    This is going to sound a little silly, but how is your fuel economy doing? Do you have any warranty concerns?
    Fuel economy seemz to have remained the same under 'normal' conditions... though my illness has somewhat limited my driving. As for warranty, there are some MB dealers that are tune friendly. Give RENNtech a call... perhaps there is one in your area.

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    Click here to enlarge Originally Posted by GoBlando Click here to enlarge
    This is going to sound a little silly, but how is your fuel economy doing? Do you have any warranty concerns?
    If you bury your foot more often it will be affected Click here to enlarge Stay out of boost, and it should be the exact same.

    For warranty you can flash back to stock.

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    any 1/4 times ?

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    Click here to enlarge Originally Posted by blkclk550 Click here to enlarge
    any 1/4 times ?
    Sorry, I don't race... yet.

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    Click here to enlarge Originally Posted by 427 Click here to enlarge
    Sorry, I don't race... yet.
    would love to see it vs a 550i with equal mods.

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    Has anyone else had any strange occurrences with 2012 CLS550 Renntech upgrade?

    I had the ECU, iridium spark plugs and K&N air filter upgrade. The car sounds and performs great BUT I have a smell of raw gasoline during idle and when at stoplights now when I have the windows open. It makes me a little nervous because prior to the ECU tune I never smelled anything in/around the car.

    I had mechanic double check the spark plugs as well as the filter. It seems the fuel mixture might be too rich... anyone else have an opinion/ideas?

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    Click here to enlarge Originally Posted by sfbenzguy Click here to enlarge
    Has anyone else had any strange occurrences with 2012 CLS550 Renntech upgrade?

    I had the ECU, iridium spark plugs and K&N air filter upgrade. The car sounds and performs great BUT I have a smell of raw gasoline during idle and when at stoplights now when I have the windows open. It makes me a little nervous because prior to the ECU tune I never smelled anything in/around the car.

    I had mechanic double check the spark plugs as well as the filter. It seems the fuel mixture might be too rich... anyone else have an opinion/ideas?
    Sounds too rich. Why not ask Renntech for a retune? @m54b25

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    Click here to enlarge Originally Posted by GoBlando Click here to enlarge
    This is going to sound a little silly, but how is your fuel economy doing? Do you have any warranty concerns?
    My dealer told me about Renntech and that the warranty would not be affected. He is going to install the ecu chip for me when my car comes in.

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    Click here to enlarge Originally Posted by SKIDROW Click here to enlarge
    My dealer told me about Renntech and that the warranty would not be affected. He is going to install the ecu chip for me when my car comes in.
    That's a hell of a dealer, who is it?

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    It's just my local MB dealer. I had purchased an E350 a few years ago and the dealer told me about an aftermarket chip I could get to boost horesepower. When I ordered my CLS for ED I asked again and was told about Renntech. He showed me the website and said they could install it for $100. Is this unusual for a MB dealer?

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