G63 awaiting ECU upgrade
Thread Starter
Member
Joined: Oct 2012
Posts: 78
Likes: 0
From: Danville, CA
2013 G63
Yeah, you can see the horror on my FA's face when I tell him I bought another car. I finally got a test drive in the G63 today and I agree with most owners that say it's quite a bit better than the G55 - making my order on Monday. Not that it needs help, but how much better does it sound with the ECU?
I won't knock the G55 at all, I loved mine. It was plenty fast and fun. My most favorite feature of the 63 is the interior. I've been driving G's for ten years, so the new cabin to me is a major plus!
Thread Starter
Member
Joined: Oct 2012
Posts: 78
Likes: 0
From: Danville, CA
2013 G63
Not sure, but I do tend to currently average 15mpg on the highway, running in sport mode...I did the mod almost immediately after the initial break-in, at approx 1100 miles.
Junior Member
Joined: Jul 2012
Posts: 28
Likes: 3
2013 g63, 2018 488 spider,2019g63, 2016 cayenne turbo s, 2015 458 speciale, 2010Ghost,2019 812
How are the ecu upgrades working out now that its been a couple of months? I just happened to look at Renntech's website and it appears they have dialed down the boost a bit. Now the ecu upgrade gets you 630hp and 620 tq which is still significant but the older upgrades look like they were claiming 669 hp and 734tq. Wonder if there have been issues.
Thread Starter
Member
Joined: Oct 2012
Posts: 78
Likes: 0
From: Danville, CA
2013 G63
How are the ecu upgrades working out now that its been a couple of months? I just happened to look at Renntech's website and it appears they have dialed down the boost a bit. Now the ecu upgrade gets you 630hp and 620 tq which is still significant but the older upgrades look like they were claiming 669 hp and 734tq. Wonder if there have been issues.
Member
Joined: Mar 2007
Posts: 150
Likes: 12
How are the ecu upgrades working out now that its been a couple of months? I just happened to look at Renntech's website and it appears they have dialed down the boost a bit. Now the ecu upgrade gets you 630hp and 620 tq which is still significant but the older upgrades look like they were claiming 669 hp and 734tq. Wonder if there have been issues.
Probably gonna pull the trigger on this, but have another week or two until I crack 1000mi, so I was hoping to hear some more first impressions and more long-term experiences to push me over the edge.
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Senior Member
Joined: May 2004
Posts: 466
Likes: 32
I have Kleemann's ECu upgrade and down pipes. I have before and after dyno sheets that I can post when I get back in town if you're interested. The power difference is huge. I have about 5000 miles on the tune so far and it's been flawless.
Junior Member
Joined: Jun 2011
Posts: 60
Likes: 1
From: NYC/NJ
13 G63/ 15 Huracan
I talked with Renntech about this today. Their explanation for this decrease was not that they dialed down the boost or they had issues with the tune, but rather the G63 and some of the other 4WD/AWDs with the 5.5 aren't putting down the power like the 2WD cars, therefore they reduced the published gains. Most of us realize that you'll lose power when it travels to 4 wheels instead of just 2, but the numbers they publish are at the crank, so why wouldn't they show the same numbers (669 and 734) for all 5.5 AMG equipped cars, if they were all really the same tune?
Probably gonna pull the trigger on this, but have another week or two until I crack 1000mi, so I was hoping to hear some more first impressions and more long-term experiences to push me over the edge.
Probably gonna pull the trigger on this, but have another week or two until I crack 1000mi, so I was hoping to hear some more first impressions and more long-term experiences to push me over the edge.
Im debating on this upgrade, the explanation that I heard from them directly is that it's the fuel quality, apparently majority of the pump quality in the US is not as good as they liked, therefore the tune needs to accommodate the lower quality and therefore published gain was reduced.
I would like to hear from owners whose had this tune for a long period of time, is it really worth it once the novelty wears off. I can certain appreciate the gain as I've always modded my cars, from giac/novitec to cobb, however I wonder if the ROI is there for a vehicle this heavy, as I don't plan to go drag race any one and the acceleration in its current state is impressive.
Newbie
Joined: Feb 2018
Posts: 5
Likes: 0
From: Seattle
G63
The upgrade made a huge difference. Throttle response was so much better and the power is incredible.
Daily drivability has not been adversely effected. Everything is normal until you flex your big toe.
Kleemann was able to do the flash and send the ecu back, same day.
