SL/R232: SL R232 Tuning to 805hp
Junior Member
Joined: Jan 2016
Posts: 44
Likes: 6
SL63,X6M,Mc600LT,296GTB
Unfortunately there has been very little information about the M177 engines in the AMG SL.
But it has been surprising that all engine outputs for the SL are below what these engines deliver in other cars. Even the SL43 is well below the power output of the engine in the CLA45.
The SL55 power is actually surprisingly similar to the non-AMG version of the same engine (M176). This is the standard Mercedes V8, which also was originally developed by AMG. These use single scroll turbos. So looking at the old W222 S560 S-Class, here is a comparison.
The only reason why I use Renntech numbers is that their dyno numbers provide for some consistency across models, along with stock figures.
S560:
Rated by Mercedes-Benz: 463 HP @ 5,250-6,000rpm; 516 LB-FT @ 2,000-4,000rpm
Dyno measured by RENNtech: 484 HP @ 5,600rpm; 538 LB-FT @ 4,750rpm
SL55:
Rated by Mercedes-Benz (avg.): 469 HP @ 5,500-6,250rpm; 516 LB-FT @ 2,250-4,500rpm
Dyno measured by RENNtech (peak): 489 HP @ 4,900rpm; 582 LB-FT @ 3,400rpm
Both engines even seem to tune to roughly the same power output.
Like others, I am eager to discover the exact specs of this particular engine and if for some reason, power is throttled perhaps for things like emissions reporting where MB is paying heavy penalties in Germany.
But it has been surprising that all engine outputs for the SL are below what these engines deliver in other cars. Even the SL43 is well below the power output of the engine in the CLA45.
The SL55 power is actually surprisingly similar to the non-AMG version of the same engine (M176). This is the standard Mercedes V8, which also was originally developed by AMG. These use single scroll turbos. So looking at the old W222 S560 S-Class, here is a comparison.
The only reason why I use Renntech numbers is that their dyno numbers provide for some consistency across models, along with stock figures.
S560:
Rated by Mercedes-Benz: 463 HP @ 5,250-6,000rpm; 516 LB-FT @ 2,000-4,000rpm
Dyno measured by RENNtech: 484 HP @ 5,600rpm; 538 LB-FT @ 4,750rpm
SL55:
Rated by Mercedes-Benz (avg.): 469 HP @ 5,500-6,250rpm; 516 LB-FT @ 2,250-4,500rpm
Dyno measured by RENNtech (peak): 489 HP @ 4,900rpm; 582 LB-FT @ 3,400rpm
Both engines even seem to tune to roughly the same power output.
Like others, I am eager to discover the exact specs of this particular engine and if for some reason, power is throttled perhaps for things like emissions reporting where MB is paying heavy penalties in Germany.
Junior Member
Joined: Jan 2011
Posts: 64
Likes: 6
From: Riverview, Fl.
2006 IWC Ingenieur CLS 55 AMG
There is no software only that will get 805 HP out of this engine. I emailed them several times for info and dyno charts no response. Someone said they don’t sell to USA? No way tune will make that much power without turbo and exhaust upgrades. I have the RPM from Renntech coming today and it takes it to 721HP. Will report back later how it feels.
Junior Member
Joined: Jan 2011
Posts: 64
Likes: 6
From: Riverview, Fl.
2006 IWC Ingenieur CLS 55 AMG
This is a curious remark. I literally backed my comment with information from Renntech that cannot take a tuned SL55 to the power of the SL63 in stock form. If both engines were mechanically identical then the ECU tune should equalize them.
Here is their Renntech's data, based on dyno results.
SL55 Stock Dyno measured by RENNtech (peak): 489 HP @ 4,900rpm; 582 LB-FT @ 3,400rpm
SL55 Tuned - Rated by RENNtech (peak @crank): 579 HP @ 5,050rpm; 664 LB-FT @ 3,350rpm
SL63 Stock Dyno measured by RENNtech (peak): 625 HP | 681 LB-FT
SL63 Tuned - Rated by RENNtech (peak @crank): 721 HP | 748 LB-FT
Opposite, you just quoted some MB engineer (or was it just a tech at the dealer) providing a quote that should not come out of an engineers mouth. No specifics whatsoever but with some goosed up software. Why don't you help the forum in contacting said engineer and ask him to provide specific details?
Here is their Renntech's data, based on dyno results.
SL55 Stock Dyno measured by RENNtech (peak): 489 HP @ 4,900rpm; 582 LB-FT @ 3,400rpm
SL55 Tuned - Rated by RENNtech (peak @crank): 579 HP @ 5,050rpm; 664 LB-FT @ 3,350rpm
SL63 Stock Dyno measured by RENNtech (peak): 625 HP | 681 LB-FT
SL63 Tuned - Rated by RENNtech (peak @crank): 721 HP | 748 LB-FT
Opposite, you just quoted some MB engineer (or was it just a tech at the dealer) providing a quote that should not come out of an engineers mouth. No specifics whatsoever but with some goosed up software. Why don't you help the forum in contacting said engineer and ask him to provide specific details?
Junior Member
Joined: Mar 2024
Posts: 65
Likes: 53
SL63 AMG (R232)
The added power will show mostly in the 100+ mph speed range. Maybe interesting for the German Autobahn (I live in Germany) or drag strips but for street driving, there are no real benefits, other than putting a LOT more stress on your drivetrain, especially if you love to race from stop light to stop light and/or use launch control frequently. Makes no sense to put more power into this car, unless you have a location to use it.
Thread Starter
Junior Member
Joined: Nov 2005
Posts: 48
Likes: 46
From: Northern California
2022 AMG SL55 Dynamic, 2005 Lotus Elise
I got the Renntech tune for my SL55 but haven't installed it yet, the issue is the ECU hasn't been hacked yet so it's a chip that spoofs the sensors. This is why they can't get the same perf out of the 55 as the 63. I am holding off for a proper ECU tune option and might return the Renntech chip.
Last edited by vbrisebo; Mar 26, 2024 at 08:24 PM.
Junior Member
Joined: Mar 2024
Posts: 65
Likes: 53
SL63 AMG (R232)
Is it? I heard that turbo chargers and a few other parts are different. Am I wrong?
Newbie
Joined: Jul 2024
Posts: 4
Likes: 1
SL63
I'm sensitive to the tuning voiding the warranty too, but understand that a Houston MB Dealer does Renntech installs so I wonder if that helps any.
I am actually more interested in an exhaust upgrade since the 63 is pretty fast as is: any input on a new exhaust creating a warranty issue?
I am actually more interested in an exhaust upgrade since the 63 is pretty fast as is: any input on a new exhaust creating a warranty issue?
Newbie
Joined: Jul 2024
Posts: 4
Likes: 1
SL63
That would be a pretty lame answer for an engineer and incorrect. We know that Renntech can't get to 600hp tuning the SL55 but over 700HP on the SL63. If this were to be mechanically the same engine, this literally wouldn't be the case and the 55 should make the same HP tuned as the 63.
So there will be some hardware differences just like in many of the other 4.0 liter AMG engines.
So there will be some hardware differences just like in many of the other 4.0 liter AMG engines.
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