DME Stage 2 Tune With Stock Cats
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From: Atherton, CA
2019 GLS63 AMG Diamond White
DME Stage 2 Tune With Stock Cats
Hey guys, I’ve been running DMEs Stage 2 tune for awhile now on stock cats. The car runs great but am I doing the engine harm by not freeing up the exhaust flow? I’ve been thinking about getting 300 cell cat downpipes from Redstar. I’ve been noticing a slight jerk before I get into boost and add throttle. Could it possibly that I need colder plugs or could it be that my cats are restricting the engine too much? My oil temps don’t go higher than 221F during spirited driving. Car has 21k miles.
Johncy
Johncy
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E55, GLS450, GL63, GLE350
It's always a good idea to free up the exhaust when running modifications. I would do downpipes and higher flow cats with stage 2 tune. You will see additional hp and the engine should run a little cooler. Would not change the plugs unless the person installing is good at indexing the plugs. Where the plug rests in the cylinder head really matters in these engines and there have been some failed engines that were not properly indexed and used non-MB plugs.
Thread Starter
MBWorld Fanatic!
Joined: May 2010
Posts: 1,496
Likes: 24
From: Atherton, CA
2019 GLS63 AMG Diamond White
It's always a good idea to free up the exhaust when running modifications. I would do downpipes and higher flow cats with stage 2 tune. You will see additional hp and the engine should run a little cooler. Would not change the plugs unless the person installing is good at indexing the plugs. Where the plug rests in the cylinder head really matters in these engines and there have been some failed engines that were not properly indexed and used non-MB plugs.
MBWorld Fanatic!
Joined: Aug 2003
Posts: 8,882
Likes: 1,212
From: In my garage
E55, GLS450, GL63, GLE350
Get with the tuner on the gap or Weistec's recommendations but I'd imagine they will come pre-gapped but you may want to check for accuracy, Indexing is even more important.
Thread Starter
MBWorld Fanatic!
Joined: May 2010
Posts: 1,496
Likes: 24
From: Atherton, CA
2019 GLS63 AMG Diamond White
MBWorld Fanatic!
Joined: Aug 2003
Posts: 8,882
Likes: 1,212
From: In my garage
E55, GLS450, GL63, GLE350
Thread Starter
MBWorld Fanatic!
Joined: May 2010
Posts: 1,496
Likes: 24
From: Atherton, CA
2019 GLS63 AMG Diamond White
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Super Member
Joined: Jul 2003
Posts: 963
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From: Illinois
2014 Mercedes-Benz GL63 AMG
100% do NOT get any aftermarket spark plugs.
I spoke with my Master MB tech about this in detail. The spark plug is indexed (must face a certain way) and if the tech senses any damage to the plug or is dropped, he will throw it away and use a fresh one.
Even if you call Renntech who used to recommend different spark plugs, now has gone back and recommends OEM spark plugs.
Weistec still recommends different spark plugs.
I also run a 91 octane tune - the difference in HP for a 93 octane tune is non-material and in case you ever run into a situation of not having 93 or getting bad fuel - just protects your engine from knock.
Use OEM spark plugs and change them every 30k miles for tuned cars if you want to play it safe.
I spoke with my Master MB tech about this in detail. The spark plug is indexed (must face a certain way) and if the tech senses any damage to the plug or is dropped, he will throw it away and use a fresh one.
Even if you call Renntech who used to recommend different spark plugs, now has gone back and recommends OEM spark plugs.
Weistec still recommends different spark plugs.
I also run a 91 octane tune - the difference in HP for a 93 octane tune is non-material and in case you ever run into a situation of not having 93 or getting bad fuel - just protects your engine from knock.
Use OEM spark plugs and change them every 30k miles for tuned cars if you want to play it safe.
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Super Member
Joined: Jul 2003
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From: Illinois
2014 Mercedes-Benz GL63 AMG
Oh and this is controversial - I see you have BMC Air Filters. My MB Master tech also told me these do allow more airflow but also allow more debris to get into the engine. The HP gains are at top end and high hp application and not worth it.
He has also seen a case of the filter deteriorating and getting into the engine and ruining it.
I'm not going to risk and and sticking with stock. If I were to change filters, I'd use the Blackboost which I believe uses BMC, but I'd get that just for the sound=)
I doubt you'll run into issues, but just sharing.
He has also seen a case of the filter deteriorating and getting into the engine and ruining it.
I'm not going to risk and and sticking with stock. If I were to change filters, I'd use the Blackboost which I believe uses BMC, but I'd get that just for the sound=)
I doubt you'll run into issues, but just sharing.
