E55 SC pulley
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From: UAE
E55 AMG 2003
E55 SC pulley
Recently I bought smaller SC pulley for my E55 and I'm wondering whether I can install it without ECU tuning or not? the new SC pulley diameter is 84mm which is about 7mm smaller than the stock pulley.
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Junior Member
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From: UAE
E55 AMG 2003
I was planning to install it for 3-6 months without tuning then I will do the tuning when I get cash in hand, however if this effect the engine negatively I will change my plan, please let me know?
Out Of Control!!
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haters crazy
Any time you add boost to a car you should retune. That's my opinion and I'm sure many will agree. If you want to run the pulley and you don't get it tuned and you do end up hurting the motor don't expect Shardul to help pay for damages.
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From: UAE
E55 AMG 2003
that's mean I have to do customised tuning as per the added boost .... who is the best to provide the correct tuning for my case?
Out Of Control!!
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haters crazy
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From: JHB, South Africa
03 E55 AMG
I am in the same boat, however, my S/C pulley will have to sit in a cupboard and I will only fit it once I have the money for a tune. I am sure the ECU will compensate, but I am petrified of running my car lean. My problem with modding is that I get used to the new power fairly quickly and when I spend money I like to have that 'holy s**t' feeling when my car pulls like a demon. This is my second reason why I will only install once I can afford a tune simultaneously.
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2006 cls 55 amg
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Joined: Jan 2014
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From: Hood River, OR
2004 AMG E55, 2011 Ram 2500 6.7L
Being a speed/density setup, the only time a tune might be required is if we exceed the software boost/fuel mappings. Can anyone quantify exactly where that limit is? Also, what mechanical device handles our boost bleed, as stated earlier? The only thing I have seen in our engine is the SC pulley clutch. So should be easy to identify or monitor when the engine "de-boosts".
My thoughts:
Yes, you can put a pulley on your car without tuning. The ECU will keep the proper mixture up to the point where it doesn't know/trust the boost PSI. At that point the SC pulley will "un-clutch" to limit itself. So you will not gain the full benefit from a pulley, but can do the upgrade in two stages. Pulley and then tune.
My thoughts:
Yes, you can put a pulley on your car without tuning. The ECU will keep the proper mixture up to the point where it doesn't know/trust the boost PSI. At that point the SC pulley will "un-clutch" to limit itself. So you will not gain the full benefit from a pulley, but can do the upgrade in two stages. Pulley and then tune.
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Joined: Jan 2013
Posts: 52
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From: UAE
E55 AMG 2003
To be in the safe side I decided to go with the tuning however I really like your statement and it is important to have a technical experts to judge and clarify this point.
Being a speed/density setup, the only time a tune might be required is if we exceed the software boost/fuel mappings. Can anyone quantify exactly where that limit is? Also, what mechanical device handles our boost bleed, as stated earlier? The only thing I have seen in our engine is the SC pulley clutch. So should be easy to identify or monitor when the engine "de-boosts".
My thoughts:
Yes, you can put a pulley on your car without tuning. The ECU will keep the proper mixture up to the point where it doesn't know/trust the boost PSI. At that point the SC pulley will "un-clutch" to limit itself. So you will not gain the full benefit from a pulley, but can do the upgrade in two stages. Pulley and then tune.
My thoughts:
Yes, you can put a pulley on your car without tuning. The ECU will keep the proper mixture up to the point where it doesn't know/trust the boost PSI. At that point the SC pulley will "un-clutch" to limit itself. So you will not gain the full benefit from a pulley, but can do the upgrade in two stages. Pulley and then tune.
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From: Hood River, OR
2004 AMG E55, 2011 Ram 2500 6.7L
dchl21, why would this be ghetto? Splitting a project up into two distinct (and separable) parts is quite logical. It may not be your preference, nor mine even, but it is logically sound. I am open to opinions and counter points, but please do so with facts, data, and logic.
MBWorld Fanatic!
Joined: Jun 2013
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From: 'Merica
'04 E55 (Gone but not forgotten), '13 C63 P31 (RIP), another '13 C63 PP
dchl21, why would this be ghetto? Splitting a project up into two distinct (and separable) parts is quite logical. It may not be your preference, nor mine even, but it is logically sound. I am open to opinions and counter points, but please do so with facts, data, and logic.
Sure, it's a project that can be split in to two distinct (and separable) parts, but it's still ghetto and not a good idea.
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From: toronto
Gallado Spyder / AMG C63S / Cayenne
^thanks g money
also because this topic was prob covered before. theres no shame driving a stock e55. its a beast already. why change sc pully without tune ? whats the point ?
are you going to cry about it if something breaks ?
also because this topic was prob covered before. theres no shame driving a stock e55. its a beast already. why change sc pully without tune ? whats the point ?
are you going to cry about it if something breaks ?
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From: UAE
E55 AMG 2003
Guys, as I mentioned before I will go for tuning directly with the SC pulley installation, in the meanwhile I’m planning to replace the exhaust cat back with straight pipes (resonator delete) and c63 mufflers 
Future plan to delete the upper catalyst only or buy headers + delete upper catalyst (depend on my budget) but I will keep oxygen sensors as-is, and I’m not sure whether I have to modify the tuning when I do that directly or I can keep with the same tuning level (again my concern here is the motor safety rather than the total HP power).
Future plan to delete the upper catalyst only or buy headers + delete upper catalyst (depend on my budget) but I will keep oxygen sensors as-is, and I’m not sure whether I have to modify the tuning when I do that directly or I can keep with the same tuning level (again my concern here is the motor safety rather than the total HP power).
