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GT/C192/R192: Anyone ECU tune their AMG GT 55 yet?

Old Mar 13, 2025 | 11:28 AM
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2024 AMG GT 55, 2024 BMW 760i
Anyone ECU tune their AMG GT 55 yet?

Wondering if anyone has done an ECU tune yet for their AMG GT 55? If so, would love to hear your thoughts....positive or negative.

Thanks!
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Old Mar 14, 2025 | 02:42 PM
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Originally Posted by Jparsons
Wondering if anyone has done an ECU tune yet for their AMG GT 55? If so, would love to hear your thoughts....positive or negative.

Thanks!
I haven’t yet, but I’m planning on getting the Renntech one for my ‘25 GT55 Coupe as soon as I hit the 1000 mile mark. Seems like a no-brainer to spend the $3k to have near-GT63 power, and I would imagine it’ll be a very safe tune since the car is identical to the GT63.

Side note from your other thread: my car still is missing all the burbles and pops like yours did initially. Did you have any more info to share from the technicians? I don’t know if it matters if I take it in now or if I can just wait until after the break-in period.
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Old Mar 14, 2025 | 03:57 PM
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Awesome! Can't wait to hear your thoughts on the Renntech ECU....that would be the only one I would consider. Are you getting the Renntech warranty with this?

And, my dealer never sent me details on what they did to get the burbles back....I will reach out again....BUT....they can definitely fix this for you....and it's SOOO worth it! This is how the car was engineered by AMG...so it should be making this sound. The service advisor thinks it was some kind of tech reset....but I will find out.

Good luck with your car!!
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Old Mar 14, 2025 | 07:54 PM
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I was told they don't have the flash ready for the c192 yet. Was I given bad info?
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Old Mar 17, 2025 | 01:21 PM
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Jordy...here is the description of what MB did to find my burbles (cracks & pops) on overrun/downshifting)....this should be enough to help your dealer fix for you....good luck!


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Old Mar 20, 2025 | 05:02 PM
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The Renntech solution is not an ECU Tune, it is a "Piggyback" solution like the JB4.

https://www.renntechmercedes.com/ind...-192-55-detail

It is available for the GT 55, it gets the GT 55 to similar HP and Torque numbers as the GT 63.
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Old Mar 28, 2025 | 06:13 PM
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My tech is a race chip dealer and so Im gonna test out their piggy on my GT63-

I have had RC on my

2018 M5
2020 M8
2021 M3
2022 M3
2023 M8
2024 M4CS
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So Im used to a cheap easy plug and play walk away device. The gains are not aggressive and on 91 its even less but the hp/tq gain per buck is fair. Ill update here after its on.

Not the GT63 but the same engine:

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Old Mar 28, 2025 | 06:28 PM
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Renntech just released theirs for the gt63
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Old Mar 28, 2025 | 07:03 PM
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Originally Posted by Zmangt63
Renntech just released theirs for the gt63
Yep, piggy back too at 5x money
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Old Mar 28, 2025 | 08:57 PM
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Originally Posted by Vic55
Yep, piggy back too at 5x money
Yeah definitely not cheap but 783hp and almost 800 lbft is impressive
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Old Mar 29, 2025 | 12:20 AM
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Originally Posted by Zmangt63
Yeah definitely not cheap but 783hp and almost 800 lbft is impressive
renntech sir- they crank adjust with no street tests

I like real world tests like 100 to 200.
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Old Jun 24, 2025 | 07:05 PM
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Any updates on the performance of the RaceChip tune?
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Old Jun 24, 2025 | 07:14 PM
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Any updates on the performance of the RaceChip tune?
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Old Jun 25, 2025 | 05:18 PM
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No RaceBox or Dragy times but there is definitely a gain in the SOTP feel. I have turned it off and on on the same roads over and over and the aggressive behavior of how the boost comes on and holds is stronger. Its not some exponential box adjuster but I think the gains are around 50hp and 60tq (as claimed) which is fine for me and the pricepoint. Plus I can take it off and not have any ECU mods if I need to bring it in for warranty.

Again for me, its a good safe mod.

Last edited by Vic55; Jun 25, 2025 at 05:22 PM.
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Old Jun 25, 2025 | 06:31 PM
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Thanks for the update
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