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Old 07-07-2020, 10:45 PM   #1
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Renntech ECU Upgrade

Anyone try this ECU upgrade? Supposed to be good for 80hp and 97 ft-lb increase.

Renntech has a pretty good rep with their other Mercedes tuning products.

$1200 isn't cheap but the hp and torque gains are pretty substantial.

https://www.renntechmercedes.com/ind...u-om642-detail
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Old 10-25-2020, 08:54 AM   #2
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Just installed the Renntech program using the handheld tuner. Amazing results and an increase in fuel economy
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Old 10-25-2020, 09:01 AM   #3
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Can you provide actual results as to performance and mileage? Does the tune void the warranty?
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Old 10-25-2020, 09:58 AM   #4
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Without a Dyno its hard to qualify the power and torque gains but pulling the hills in the poconos and upstate NY towing a 2 door wrangler with the cruise set at 68 i would drop down to 50-55 in spots now cruise maintains at 68-70. In addition there is power to pass on the left as well. As far as mileage, we typically average 12.4 fully loaded and the past trip was 12.9. The programmer uses a hand held tuner so you can switch back to stock program at anytime. Renntech is a huge MB dealer in Florida so I am confident they know how to tweak the ECU without causing component failures. Being in the Diesel engine business my whole career I havenít seen much warranty denied unless it was a clear maintenance issue.
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Old 10-25-2020, 02:09 PM   #5
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Is your plan to turn the tune to stock prior to maintenance each time?
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Old 10-25-2020, 02:38 PM   #6
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I do all my own maintenance. Would only use the dealer if i had a warranty failure and then i would tune it back to stock.
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