SL/R232: Tune/flash for the R232
Thread Starter
Newbie
Joined: May 2025
Posts: 9
Likes: 6
AMG SL 63
Tune/flash for the R232
I am surprised there are enough ECU flashes available for the R232 series just a couple of piggybacks given the new AMG gt has the same engine I had hopped something was out there by now does any one know of a tuning shop working on it?
SPONSOR
Joined: Dec 2010
Posts: 5,745
Likes: 134
From: Santa Ana, CA
OE Tuning C63 AMG
Newbie
Joined: Sep 2023
Posts: 10
Likes: 11
S580
When I searched for a tune for my MY22 SL55 a few months ago Renntech RPM was about the only option. Anyway, I had it installed this week and the results are fantastic. I was fearful of 2 things: 1) it would alter the normally well behaved nature of the car and 2) the horsepower increase would not be substantial enough. Happy to say fears were unfounded. There is no change in the normal driving behavior and the increase in power is immediately noticed and appreciated. I'm so glad I had it done. IMHO, the only thing lacking in the SL55 is a shortage of hp and that is now corrected.
Newbie
Joined: Sep 2023
Posts: 10
Likes: 11
S580
The unit from Renntech was $3200 and install labor was around $1000. The install does not look complicated and should probably have been DIY but I just felt more comfortable having a shop so it. I consider myself handy on most stuff but not around the engine bay of a modern car.
Member
Joined: Mar 2023
Posts: 108
Likes: 90
SL55 2023
When I searched for a tune for my MY22 SL55 a few months ago Renntech RPM was about the only option. Anyway, I had it installed this week and the results are fantastic. I was fearful of 2 things: 1) it would alter the normally well behaved nature of the car and 2) the horsepower increase would not be substantial enough. Happy to say fears were unfounded. There is no change in the normal driving behavior and the increase in power is immediately noticed and appreciated. I'm so glad I had it done. IMHO, the only thing lacking in the SL55 is a shortage of hp and that is now corrected.
Newbie
Joined: Sep 2023
Posts: 10
Likes: 11
S580
I don't have any under hood photos but I'll try to get one. Actually, i haven't even opened the hood to look at it. I have not seen one single iota of change in the driving behavior. Zilch, zero. If it wasn't for the extra g forces i would never know if was done. It can be a little jerky in first gear and that has not changed good or bad. Sorry, can't comment on launch mode, never used it.
Trending Topics
Member
Joined: Mar 2023
Posts: 108
Likes: 90
SL55 2023
Would love to see wires and hardware visible when you have a chance to take a photo. Launch mode is a "must do"...make sure you are in sport plus mode and make sure the engine is warmed up with a 10-15 minute drive...then at a full stop: use your left foot to fully and strongly depress the brake, then hold the accelerator full with your right foot...then you will see launch mode displayed on the screen and the engine will rev a regulated amount...then let off the brake and the car will tighten the seat belts and take off like a monster...super fun ! Let us know if you try it. Nothing like the "first time"
Last edited by xtdoc777; May 18, 2025 at 08:55 PM.
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
Member
Joined: Mar 2023
Posts: 108
Likes: 90
SL55 2023
https://youtu.be/sCxgtuQQy-8?si=TUK-4zaFHM3UDWXG
Only for DYNO misures, in the street the 63 KILLS 3 TIMES A 55!!!
Only for DYNO misures, in the street the 63 KILLS 3 TIMES A 55!!!
MBWorld Fanatic!
Joined: Jan 2013
Posts: 1,170
Likes: 413
From: Irvine, California
2022 AMG SL63
In the video, the stock 63 clearly beats the tuned 55 on the quarter mile BUT the tuned 55 launched faster and it took a bit for the 63 to pass the 55. So for normal street driving I would think the faster launch with the tune would be appreciated. Would also be interesting to see a video with the tuned 55 vs stock 55.
Member
Joined: Mar 2023
Posts: 108
Likes: 90
SL55 2023
I missed that in the video but may be right…I have been going back and forth about getting the rentech piggyback upgrade....perhaps someone will break the mercedes protection and be able to do a full tune which may be more effective.
Thread Starter
Newbie
Joined: May 2025
Posts: 9
Likes: 6
AMG SL 63
I have a Renntech unit going in next week will report back soon.
Newbie
Joined: Jun 2025
Posts: 1
Likes: 3
I just had the renntech installed on my '22 sl55. It's such a great improvement. Much better throttle response, acceleration, driving experience. Absolutely worth it imo. This is the 3rd car I've tuned, one of the times the difference was sort of negligible and I had to try to convince myself I could tell a difference. That is not the case here. It was instantly noticeable and significant.
Thread Starter
Newbie
Joined: May 2025
Posts: 9
Likes: 6
AMG SL 63
Well I have had the renntech piggyback on my SL 63 for a couple of months now no issues and cars feels faster have run against a modded RS7 ( 4 pulls) and walked the RS easily it was actually embarrassing how much faster I was.
Thread Starter
Newbie
Joined: May 2025
Posts: 9
Likes: 6
AMG SL 63
your assumptions and I will with my real-world experience
Member
Joined: Jul 2023
Posts: 209
Likes: 67
2019 G63 AMG & 2024 AMG GT63
Hello, refreshing a thread mainly because I cant find much about this Renntech RPM...
I have a 2024 GT63 2dr, and it appears that this renntech unit is identical to the unit for the SL63.
So i'm looking for some real world information on it before I order.
Im coming from a BMW M5 Competition that I had installed a Racechip in which added I think 70-80hp to, and it was pretty noticeable. Racechip makes a unit for the R232, as well as the C192 AMG GT63, but the power numbers are almost 1/2 of the Renntech unit.
So i'm looking for real world experience with the RT piggy back. Is it worth the cost? Because it is 4x more than the Racechip. Are the gains noticeable? Any other additional details you may have or be able to provide for someone trying to guage if I should add this to my GT63?
Thanks in advance!
I have a 2024 GT63 2dr, and it appears that this renntech unit is identical to the unit for the SL63.
So i'm looking for some real world information on it before I order.
Im coming from a BMW M5 Competition that I had installed a Racechip in which added I think 70-80hp to, and it was pretty noticeable. Racechip makes a unit for the R232, as well as the C192 AMG GT63, but the power numbers are almost 1/2 of the Renntech unit.
So i'm looking for real world experience with the RT piggy back. Is it worth the cost? Because it is 4x more than the Racechip. Are the gains noticeable? Any other additional details you may have or be able to provide for someone trying to guage if I should add this to my GT63?
Thanks in advance!
Newbie
Joined: Dec 2025
Posts: 2
Likes: 0
SL 63 & GLE 63S
I’m interested in a tune as well. Did the Renntech HHT on my 2019 C63S and it was awesome. Not so sure about the piggyback and the issue of bringing it to the dealer for service
when under extended warranty.
Is the difference with Renntech piggyback noticeable enough to put up with potential warranty concerns?
when under extended warranty.
Is the difference with Renntech piggyback noticeable enough to put up with potential warranty concerns?
MBWorld Fanatic!
Joined: Jan 2013
Posts: 1,170
Likes: 413
From: Irvine, California
2022 AMG SL63
If my memory serves me correctly, there are some Mercedes dealers who have a relationship with Renntech and they do Renntech work that doesn't interfere with or invalidate Mercedes' warranty.
Member
Joined: Oct 2017
Posts: 217
Likes: 95
From: PA
2020 S63 Coupe, 911, BMW 760 2022 SL55 2024 Range Rover
Having built more that 150 one off cars in the 30 years I spent as a builder (it was my hobby not a business), everyone of those cars are still running (the ones that are not were because their owners or someone else crashed them). The 911 in my garage that I built 20 years ago did blow up a few transmissions until I found the right way to modify it, but it is still running great. Yes too much torque can mess with transmissions, but the unit in these cars all appear to be the same and built to likely take more the the 63 is putting out. Personally I prefer tuning the ECU (with a handheld unit that store the original files), but it appears like Porsche the ECU must be unlocked before it can be tuned, which would require sending your ECU to someone who has figured out how to do it. I can only assume (I just bought my SL55 last Friday and it is still sitting at the dealership since we had a pretty big winter storm here over the weekend) that is why I cannot find any tunes other than the piggy back. If you can follow directions you don't need to pay $1000 to have someone install it. I did a favor for a friends grandson and put a piggy back in his BMW, took about 10 minutes. If there is a vendor out there that can do this, I invite them to contact me.
Senior Member
Joined: Jun 2010
Posts: 465
Likes: 121
2022 SL 55 AMG, 2020 AMG GT 53, 2015 GL 550
I've Renntech tuned several Mercedes. They're the cleanest tunes out in my opinion. Never had a single issue. But I must say, this car is already so damn fast I don't think I need to tune it. My AMG GT 53 on the other hand, I'm very disappointed in a V6, I usually don't test drive cars, I obsess over them when I see them, find one online and pull the trigger. I regret that decision with the AMG GT 53. That one, I may go with the piggyback. I wished they cracked the ECU because the old OBD flash tunes were perfect! No labor costs.
