GT/C192/R192: 2024-2025 GT63 Coupe/Renntech RPM ECU Piggy Back
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From: EARTH
2026 MB/AMG GT63 PRO
2024-2025 GT63 Coupe/Renntech RPM ECU Piggy Back
Any use cases out there of anyone using Renntech's RPM ECU Piggy Back? If so please provide driving feedback. I just got mine but have not installed it as I am still in the break-in period.
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2019 G63 AMG & 2024 AMG GT63
I am considering the renntech piggy back for my gt63, is that what you got?
If so, what are your thoughts on it? Worth it? Noticeable difference? Any issues? How is the install?
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From: THE Orange County, California
2024 C8 Z06- 2025 BMW CS- 2022 Porsche 992 GTS
I looked at the RT piggy but knowing its just tweaking the boost; I went with the cheaper RaceChip which will do the same thing. The gains on paper might not be as optically favorable but its the same sht for a fraction of the RT tax.
I have had zero issues with mine and the gains are NOT negligible at all. I switch the maps off and on all the time and there is a noticeable gain. It makes the car more like I feel it should have come from the factory and doesnt mess with the ECU (which is super hard to unlock I hear).
So no RT experience.
I have had zero issues with mine and the gains are NOT negligible at all. I switch the maps off and on all the time and there is a noticeable gain. It makes the car more like I feel it should have come from the factory and doesnt mess with the ECU (which is super hard to unlock I hear).
So no RT experience.
Last edited by Vic55; Nov 17, 2025 at 11:07 AM.
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I've heard its great, waiting until next season to put one on my 63. Have a solid connect I've bought most my vehicles form at Mercedes and him and a bunch of other employees told me that the RT tune is the perfect and most optimal route to go, it also gives noticeable gains when driving. Also great considering its reversible back to stock whenever you want.
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2019 G63 AMG & 2024 AMG GT63
I looked at the RT piggy but knowing its just tweaking the boost; I went with the cheaper RaceChip which will do the same thing. The gains on paper might not be as optically favorable but its the same sht for a fraction of the RT tax.
I have had zero issues with mine and the gains are NOT negligible at all. I switch the maps off and on all the time and there is a noticeable gain. It makes the car more like I feel it should have come from the factory and doesnt mess with the ECU (which is super hard to unlock I hear).
So no RT experience.
I have had zero issues with mine and the gains are NOT negligible at all. I switch the maps off and on all the time and there is a noticeable gain. It makes the car more like I feel it should have come from the factory and doesnt mess with the ECU (which is super hard to unlock I hear).
So no RT experience.
Are you saying this is all nonsense and the gains are the same no matter what piggy back it is? If thats the case I would just go with racechip also, but if I can get almost double the gain with the RT I would go that route maybe.
Thanks again
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From: THE Orange County, California
2024 C8 Z06- 2025 BMW CS- 2022 Porsche 992 GTS
Thank you sir, appreciate the insight. My F90 Comp I had race chip on, and it was definitely noticeable, but they advertised like 90-120 HP gain I thought on the F90. ON the GT63 they only say like 50-60HP gain, which is why im considering renntech as they advertise 100hp also.
Are you saying this is all nonsense and the gains are the same no matter what piggy back it is? If thats the case I would just go with racechip also, but if I can get almost double the gain with the RT I would go that route maybe.
Thanks again
Are you saying this is all nonsense and the gains are the same no matter what piggy back it is? If thats the case I would just go with racechip also, but if I can get almost double the gain with the RT I would go that route maybe.
Thanks again
I think on the F90 (which I had too) the RC used crank gains = creative.
Im definitely not saying its all the same but Im also saying Im not sure how much the gains would be with RT over RC.
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2019 G63 AMG & 2024 AMG GT63
I can not validate the RT one--- so it might be more but its thru boost bumping. RC is the safe and cheap alternative.
I think on the F90 (which I had too) the RC used crank gains = creative.
Im definitely not saying its all the same but Im also saying Im not sure how much the gains would be with RT over RC.
I think on the F90 (which I had too) the RC used crank gains = creative.
Im definitely not saying its all the same but Im also saying Im not sure how much the gains would be with RT over RC.
AFAIK Renntech and Racechip are the only 2 piggy backs/ or any sort of tune avail? I know Brabus offers something but likely even a lot more $.
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From: THE Orange County, California
2024 C8 Z06- 2025 BMW CS- 2022 Porsche 992 GTS
I think you will be very happy with Racechip and the gains plus monies not wasted. I was ripping mine today in the rain in ESP Sport and that car impresses with the grip and the added power didnt sway it.
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Thread Starter
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Joined: Aug 2018
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From: EARTH
2026 MB/AMG GT63 PRO
OMG...this dude. No need to worry about the so called brand tax.
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From: THE Orange County, California
2024 C8 Z06- 2025 BMW CS- 2022 Porsche 992 GTS
DUDE LOL are you 10? Of course brand tax plays some sort of role. But hell I dont have that many cars that fall into that range. 
AND the RC charges a relatively flat fee for all their products regardless of brand so lets call that a flat tax.
Anyways let us know how your 3000 dollar piggy works.
AND the RC charges a relatively flat fee for all their products regardless of brand so lets call that a flat tax.
Anyways let us know how your 3000 dollar piggy works.
Last edited by Vic55; Nov 20, 2025 at 09:49 AM.
Thread Starter
Junior Member
Joined: Aug 2018
Posts: 59
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From: EARTH
2026 MB/AMG GT63 PRO
DUDE LOL are you 10? Of course brand tax plays some sort of role. But hell I dont have that many cars that fall into that range.
AND the RC charges a relatively flat fee for all their products regardless of brand so lets call that a flat tax.
Anyways let us know how your 3000 dollar piggy works.
AND the RC charges a relatively flat fee for all their products regardless of brand so lets call that a flat tax.
Anyways let us know how your 3000 dollar piggy works.
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2019 G63 AMG & 2024 AMG GT63
Cool now that that little spat is out of the way..... Since this was your thread to begin with, and you apparently have the RN piggy back... anything else to add other than it works fantastic?
Any thoughts on it? Is it worth the $ over the RC? The RT piggy back is 3800.00, RC is 800.00....
I, like i'm sure many others, can afford to buy both multiple times over, light them on fire along with the car and my house on fire, and still have enough to replace it all, and not really notice....
HOWEVER, if they do the exact same thing, with no noticeable or quality gains over the other, why would I light $3,000.00 on fire if I don't have to? Just because I can, doest mean I should have to, or even want to. But if theres anything notable over the other? Then, I'll go with whichever I find to be the better value, for me, regardless of the price.
Basically looking for the same info you were when you posted this to begin with.
Thanks in advance
Last edited by ffejnotrom; Nov 20, 2025 at 10:19 PM.
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2024 C8 Z06- 2025 BMW CS- 2022 Porsche 992 GTS
Why is that--- its not a dme/ecu block- its the same install and the same engine no with same boost sensor location(s)?? (not being sarcastic just really asking cause I think there are others with a 25 and RC)
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Mercedes tightened the parameters on the boost controller and rc hasn't figured a way around it yet. Rt has it figured out.
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From: EARTH
2026 MB/AMG GT63 PRO
NOTE: My car is a 2025. Production date was 11/21 2024. Not sure when that new SW turnover occurred. My factory SW was updated in July of this year. You can use that as a starting point.
Last edited by Area51; Dec 19, 2025 at 12:17 PM.
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From: THE Orange County, California
2024 C8 Z06- 2025 BMW CS- 2022 Porsche 992 GTS
And I thought Audi was tight AF with my 2025 RS6!
BTW I got another Z06 (3LZ HTC)... that car is smile deliver as well.
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Administrator
Joined: Nov 2001
Posts: 12,263
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From: THE Orange County, California
2024 C8 Z06- 2025 BMW CS- 2022 Porsche 992 GTS
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Joined: Jul 2023
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2019 G63 AMG & 2024 AMG GT63
Yes sir true statement. My Rt worked perfect with the from factory ECU SW. However over the summer I took the car in to get the latest and greatest SW update. That's when I almost immediately started to go into limp mode (Amber Turtle on the instrument cluster). Downloaded the code and got with Renntech for a solution. They were already aware of this from previous cars. Sent my RPM (Renntech Power Module) and harness back to them for a software update and harness update. Got it back in the same week. Going on 5 months now after update with no problems.
NOTE: My car is a 2025. Production date was 11/21 2024. Not sure when that new SW turnover occurred. My factory SW was updated in July of this year. You can use that as a starting point.
NOTE: My car is a 2025. Production date was 11/21 2024. Not sure when that new SW turnover occurred. My factory SW was updated in July of this year. You can use that as a starting point.
is it worth it you think over a rc? I have a 2024. Is it worth the cost in general? Do you feel it actually does what they claim?
ive been trying to get some real world feedback on a RT and decide if I should get one, or just go with RC, or nothing at all.
anything to add here? It is your thread after all, and you asked the same thing originally with the thread. But have yet to answer why I resurrected this thread. Any input would be great.
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ok, so I resurrected this thread a little while ago to find out your thoughts on the piggy back you have.
is it worth it you think over a rc? I have a 2024. Is it worth the cost in general? Do you feel it actually does what they claim?
ive been trying to get some real world feedback on a RT and decide if I should get one, or just go with RC, or nothing at all.
anything to add here? It is your thread after all, and you asked the same thing originally with the thread. But have yet to answer why I resurrected this thread. Any input would be great.
is it worth it you think over a rc? I have a 2024. Is it worth the cost in general? Do you feel it actually does what they claim?
ive been trying to get some real world feedback on a RT and decide if I should get one, or just go with RC, or nothing at all.
anything to add here? It is your thread after all, and you asked the same thing originally with the thread. But have yet to answer why I resurrected this thread. Any input would be great.
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Joined: Nov 2001
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From: THE Orange County, California
2024 C8 Z06- 2025 BMW CS- 2022 Porsche 992 GTS
I actually had the opportunity to see both the RC and RT on the same dyno on the same day. The RT is definitely the way to go. It had significantly more gains than the RC on the dyno. It wasnt my car so i can't provide the dyno sheet but i witnessed it and it's a no brainer. Who knew you actually do get what you pay for
I went to the RT site to see what the current price was and its not even listed on their site anymore??
Not sure what happened there?
C192
