19 AMG GTR: Tune or not to Tune?

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Old Dec 5, 2019 | 03:52 PM
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Question 19 AMG GTR: Tune or not to Tune?

So my 2019 AMG GTR is coming this weekend and I am planning some upgrades such as brake cooling for the track. But the question is should I tune or not?
What do you think? Is it worth it? Stage 1 (no turbos or downpipes) or is too much risk with the warranty? What are some of the pros and cons? And if tune which one: renntech?

Last edited by tmemore; Dec 5, 2019 at 03:57 PM.
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Old Dec 5, 2019 | 05:56 PM
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/////PRO
Absolutely tune!
DME Tuning.
Pros:
-unleashes all the full potential, especially when dealing with reputable tuner experienced on the platform.
Cons:
-none, although many will try to panic you into all sorts of them.
-IF you choose a tuner make sure they are providing a nice linear tune so the throttle input isn’t choppy.

Last edited by dlefty; Dec 5, 2019 at 06:44 PM.
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Old Dec 5, 2019 | 06:15 PM
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Just make sure if you tune it use a tune that uses the handheld tuner thru the OBD port so you can reverse it yourself when you take it into the MB dealer for service or warranty.
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Old Dec 5, 2019 | 06:53 PM
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Originally Posted by badbenzz
Just make sure if you tune it use a tune that uses the handheld tuner thru the OBD port so you can reverse it yourself when you take it into the MB dealer for service or warranty.
Yeh I think Renntech does this, but doesnt ECU keep track of software updates anyway? I assume dealer will know if ECU was updated even if it goes back to stock.

Interesting thing is why E63S or GT63S makes 630hp with the same motor vs 577hp in thr GTR, I am assuming it is all in the tune.

Last edited by tmemore; Dec 5, 2019 at 06:55 PM.
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Old Dec 5, 2019 | 07:23 PM
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Originally Posted by tmemore
Yeh I think Renntech does this, but doesnt ECU keep track of software updates anyway? I assume dealer will know if ECU was updated even if it goes back to stock.

Interesting thing is why E63S or GT63S makes 630hp with the same motor vs 577hp in thr GTR, I am assuming it is all in the tune.
If the dealer looks for it, they will find it, no matter which tune you use. Best to make sure your service guy knows not to hook it up to scanning systems, before you decide to tune it.


If you do decide to, I'd go with Eurocharged. Renntech is vastly overpriced, and gives less performance.

Last edited by Orcbolg; Dec 5, 2019 at 07:26 PM.
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Old Dec 5, 2019 | 07:53 PM
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If you are wanting more power because you want to run the car at the drag strip, and if you are willing to pay out of pocket for a drivetrain failure, then by all means tune the car.

But on a road course this car has plenty of power, and you’ll need to treat the gas pedal as a rheostat, not an on-off switch. Otherwise you’ll loop the car easily at corner apex before track out. In other words on the vast majority of tracks, the 577 hp which Renntech found to be actually around 607 hp iirc, is more than enough. Money for the tune far better spent on alignment; brake upgrades; tyres/wheels, etc.
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Old Dec 5, 2019 | 08:56 PM
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Originally Posted by thebishman
But on a road course this car has plenty of power, and you’ll need to treat the gas pedal as a rheostat, not an on-off switch. Otherwise you’ll loop the car easily at corner apex before track out. In other words on the vast majority of tracks, the 577 hp which Renntech found to be actually around 607 hp iirc, is more than enough. Money for the tune far better spent on alignment; brake upgrades; tyres/wheels, etc.
I never knew Renntech uncovered the GT R to be underrated. I know they found the GTS to be underrated by MB.
Do you have the article which shows their findings of the GT R? I'm not disputing it, I just find that to be interesting.
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Old Dec 5, 2019 | 09:40 PM
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Originally Posted by P Rock
I never knew Renntech uncovered the GT R to be underrated. I know they found the GTS to be underrated by MB.
Do you have the article which shows their findings of the GT R? I'm not disputing it, I just find that to be interesting.

https://www.renntechmercedes.com/ind...mg-gt-r-detail
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Old Dec 5, 2019 | 10:02 PM
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Why M178 in GTR makes less HP than in E63s or GT63s? 609 is still shy of 630 hp. I think all have same turbos and same motor minus the dry sump in E and GT63s.
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Old Dec 6, 2019 | 08:28 AM
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Keep in mind you might overheat at the track with a tune.
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Old Dec 6, 2019 | 08:38 AM
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Tmemore, keep in mind Bish is not a bench racer, he tracks his GT R frequently and has done his upgrades as needed... He is one to listen too
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Old Dec 6, 2019 | 09:09 AM
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Originally Posted by tmemore
Why M178 in GTR makes less HP than in E63s or GT63s? 609 is still shy of 630 hp. I think all have same turbos and same motor minus the dry sump in E and GT63s.
I've questioned this a lot. Its not the same motor since one is dry and one is wet sump. How the earlier generation is more tuneable I still don't understand.

GTRs have rolling roaded as high as 625bhp stock I believe but then there is a big variance between facilities.
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Old Dec 6, 2019 | 09:44 AM
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Renntech GTR at ring very fast. I believe 760hp.

https://www.google.com/url?sa=t&sour...5h8hoPWDxQonzg
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Old Dec 6, 2019 | 11:25 AM
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Originally Posted by tmemore
Why M178 in GTR makes less HP than in E63s or GT63s? 609 is still shy of 630 hp. I think all have same turbos and same motor minus the dry sump in E and GT63s.
I believe I read that the difference is due to exhaust routing being more restrictive on the GTR; hence hp down versus the E63S, etc.

Bish
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Old Dec 6, 2019 | 11:32 AM
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Originally Posted by thebishman
I believe I read that the difference is due to exhaust routing being more restrictive on the GTR; hence hp down versus the E63S, etc.

Bish
Maybe on the BS we will get a side exit exhaust like the SLR then

Always remember the first time I heard one of those. At 180mph it sounded like a spitfire trying to take off.
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Old Dec 6, 2019 | 11:33 AM
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Originally Posted by thebishman
I believe I read that the difference is due to exhaust routing being more restrictive on the GTR; hence hp down versus the E63S, etc.

Bish
I've read that somewhere as well, but I don't buy it. It makes no sense to lose 50HP over some restriction in the exhaust?. Makes no sense. I think exhaust routing is very similar.. I think it is a tune only.
Detuned for track use, maybe a heat issue.. I dont know.. But exhaust makes no sense.
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Old Dec 6, 2019 | 11:48 AM
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I think the lower HP rating on the GT R i s all done in the name of sales. The E63S has a 1000lbs on the GT R and needs the added HP to be relevant in its segment. Had the first run of the GT's been launched with 630HP in 2016, where would they go from there? We'd be disappointed that it didn't increase to 800HP today. They give us what they want to show us, not what we want. My 2 cents.
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Old Dec 6, 2019 | 03:07 PM
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Originally Posted by WhiteBlack
Maybe on the BS we will get a side exit exhaust like the SLR then

Always remember the first time I heard one of those. At 180mph it sounded like a spitfire trying to take off.
Got to love a RR V12 Merlin!
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Old Dec 6, 2019 | 09:05 PM
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Originally Posted by wawrecker
I think the lower HP rating on the GT R i s all done in the name of sales. The E63S has a 1000lbs on the GT R and needs the added HP to be relevant in its segment. Had the first run of the GT's been launched with 630HP in 2016, where would they go from there? We'd be disappointed that it didn't increase to 800HP today. They give us what they want to show us, not what we want. My 2 cents.
Yes except, renntech Dyno confirms that GTR makes less WHP than E63s.. so I don't think it is just sales or marketing ploy. I think stock GTR does really make less HP, although not clear why.. most likely software restriction.
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Old Dec 7, 2019 | 12:58 PM
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Originally Posted by tmemore
So my 2019 AMG GTR is coming this weekend and I am planning some upgrades such as brake cooling for the track. But the question is should I tune or not?
What do you think? Is it worth it? Stage 1 (no turbos or downpipes) or is too much risk with the warranty? What are some of the pros and cons? And if tune which one: renntech?
I don't know how much you track cars, but from a power and giddy up perspective, this car is pretty stout out of the box. If your experience level is mild to moderate, I would recommend getting used to what the car comes with. It takes some skill (and couragec ou get the max out of this thing.

J
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Old Dec 7, 2019 | 04:57 PM
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Pretty sure the E63S has different manifolds and turbos than the GT lineup. Saw a discussion somewhere else on the forum about people trying to source those parts for their C63S.

For a street car or highway cruiser, I'd say tune it. For a track car, it depends on a few more things: your skill level, can the cooling system keep up, can the braking system keep up, etc.
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Old Dec 7, 2019 | 05:31 PM
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I think I will leave it stock for now...It will see track 3-5 DE events per year. I've been tracking my GT3 for a few years and have RS as well. I dont touch my Porsches (just center delete exhaust)..
Money better invested in break upgrade: cooling, rotors, pads.
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Old May 19, 2021 | 05:04 PM
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Originally Posted by tmemore
So my 2019 AMG GTR is coming this weekend and I am planning some upgrades such as brake cooling for the track. But the question is should I tune or not?
What do you think? Is it worth it? Stage 1 (no turbos or downpipes) or is too much risk with the warranty? What are some of the pros and cons? And if tune which one: renntech?
did you end up tuning?
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Old Dec 26, 2021 | 01:03 AM
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Originally Posted by tmemore
Yes except, renntech Dyno confirms that GTR makes less WHP than E63s.. so I don't think it is just sales or marketing ploy. I think stock GTR does really make less HP, although not clear why.. most likely software restriction.
THE E63S has a set of twin scroll twin turbos... not the gtr ( the amg gt black serie has the twin scroll twin turbos though)
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Old Dec 26, 2021 | 01:18 AM
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Originally Posted by thebishman
I believe I read that the difference is due to exhaust routing being more restrictive on the GTR; hence hp down versus the E63S, etc.

Bish
100 percent not true. The GT has a pretty free flowing exhaust setup.
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