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Any Renntech ECU issues out there?

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Old Mar 10, 2025 | 12:53 PM
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JSP321
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From: San Antonio, TX
2024 AMG GT 55, 2024 BMW 760i
Any Renntech ECU issues out there?
Wondering if anyone who put a Renntech ECU chip in there car had any issues? Did this affect reliability at all? Any pushback/issues with MB dealers? Would you do this again?

Many thanks in advance for your input!
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Old Mar 11, 2025 | 07:00 AM
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AMGGT
Originally Posted by Jparsons
Wondering if anyone who put a Renntech ECU chip in there car had any issues? Did this affect reliability at all? Any pushback/issues with MB dealers? Would you do this again?

Many thanks in advance for your input!
I’ve had my 2017 base GT tuned for 4 years and love it. 1/4 mile 10.7 @128 mph and around 600 hp with no issues at all, and I just unplug it to flash back to stock when I take it to the dealership. I would definitely do it again whenever the car is out of warranty.
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Old Mar 11, 2025 | 11:26 AM
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JSP321
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From: San Antonio, TX
2024 AMG GT 55, 2024 BMW 760i
Thanks for sharing! Would you hesitate to get this ECU if car is still within warranty? (3 years left on mine).

And, do dealer "know" that your car has had an ECU tune? Thx
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Old Mar 12, 2025 | 07:00 AM
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AMGGT
I flashed it back to stock for my A service , and my local MB dealer never said anything. It was super easy
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Old Mar 13, 2025 | 11:02 AM
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AMG GTS
I have the Renntech HHT (Hand Held Tuner) that allows you to flash the ECU anytime and as many times as you want. I've had no problems with it. Works very good!
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