AMG_Comeon

Hoping someone can help me here. I have a 2021 AMG GTR, had it since new, and last week I took it in for its regular service.

When I picked it up, I RIGHT AWAY noticed it quieter... Then when I drove it, it was like I was driving a different car. Everything is quieter, less pops, everything.

What do I do? I drove it right back and they said they didn't do any software updates or anything.

I took the service guy for a drive and he said he notices it a bit quieter...

I know this has been an issue for some c63 and GT folks, but wow this is just terrible.

Is there a fix? (without a tune and all that)...

DK308

I don't believe that they didn't do an update. The problem is that it is often very difficult to roll it back.

It is very common for car companies to make such changes due to emissions.
When the Ferrari 458 launched in 2010, it had a fuel map which created a lot of pops and burbles. When they launched the 458 Spider in 2012 they also rolled out a new mapping without the pops and burbles to meet new emission standards. That means that a Ferrari 458 from 2012 does not have the pops and burbles, and when a pre-2012 car is updated, they are lost. In that case we know that it cannot be rolled back at the dealer.

When your car is at service, they will ALWAYS hook it up to the computer, and it will automatically install any updates there is. Ask them to hook it up to see what version of firmware there is in it now. If that firmware predates your previous service, then they did not install a new firmware. If it is newer, then they did.

In the case you can contact an indy to see if they have an older firmware. Other than that, I don't know what else to do.

W205C43PFL

See if EVM brings back the sound, the updates usually all it does is closes the valves more.

MG1422

This happened to my 2019 whenever I did the 10k service. Start ups are not as loud and you can just tell it is a little bit more quiet. I even have a resonator delete.

HHS550

Is there a way to save our tunes before going in for service? And if dealer updates the software and we reload our own tunes to overwrite theirs?

luvair

Cannot speak for a 2021 GTR, but I know of the Ferrari 458 with their software update that reduced the pops and gargles.

What I did for the 458 was plug the vacuum hoses that now keep the valves open all the time. It is pretty common with the 458s, FWIW.

I don't know about the newer GTRs that can plug vacuum hoses, but maybe someone here knows.

W205C43PFL

So does that mean all the update did was close the valves more than before making it sound less and I guess ECU retard the timing less which also results in less pops?

luvair

No. The 458 SW ECU update included the closing of injectors when you lift off the throttle. This affects how much unburnt fuel is delivered to the exhaust system. Plugging the vacuum line just keeps the valves open all the time which provides louder exhaust tones, especially below 4,500 RPMs. I just don't know how that relates to the new GT-R between C, S, S+, and R. I Like to think the dealer would know, or an independent that knows AMG.

W205C43PFL

Appreciate the info.

DK308

That will not work here. It has nothing to do with valve control. The burbles and pops are gone because of different fuel mapping, Your 458 does not pop and burble like a pre-2012 458 if it has been updated. You just get the added noise.