retune with pulley change
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MBWorld Fanatic!
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2005 e55 AMG
retune with pulley change
Is a re tune with a smaller pulley really needed. These E55 engines are speed density so I dont see what adding 2lbs of boost more will do to the engine as far as throwing off the air ratio to much. I know on all of the Western Motorsport and FAST DFI system that are speed density on Ford musangs we have tuned adapt perfectly with no problem and only because they are speed density. Just useing them as an example and not trying to compare to a Ford.
More boost...more fuel ....as long as it does not swing off the factory fuel scale it should be all good I would think, no? There are guys I heard of just throwing on a pulley and have had no problems.What do you guys think.
More boost...more fuel ....as long as it does not swing off the factory fuel scale it should be all good I would think, no? There are guys I heard of just throwing on a pulley and have had no problems.What do you guys think.
Last edited by SICAMG; Jul 28, 2014 at 06:30 PM.
Senior Member
Joined: Nov 2012
Posts: 381
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From: Houston, TX
2006 E55
I would tune. Also keep in mind that depending on your cars mileage, if your fuel pump/senders are aged over 60,000 miles chances are your filter is getting nasty and you may see fuel pressure drops under load. I'd deal with a tune that may have a slight hiccup (I'm not sure that is really as big an issue on these cars as you are making it out to be) than lean out hard and smoke an expensive power plant.
Fueling and cooling are huge deals on these cars. I would seriously consider looking into both if you are going to keep throwing mods at it.
Fueling and cooling are huge deals on these cars. I would seriously consider looking into both if you are going to keep throwing mods at it.
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From: Houston/ Austin /Toronto / UAE / Minneapolis / Orlando /Cincinnati
Eurocharged Performance ML63 and TT lambo
Tune the car or go with a pulley and tune package. (we can help with that)
The costs these days of tuning is dramatically lower that it has been and it is cheap insurance.
We have done thousands of cars...we know these engines very very well.
The costs these days of tuning is dramatically lower that it has been and it is cheap insurance.
We have done thousands of cars...we know these engines very very well.
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Joined: Jan 2014
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From: Hood River, OR
2004 AMG E55, 2011 Ram 2500 6.7L
Think you are confused on Speed/Density versus Mass/Flow. Speed/Density calculates the mass of air entering the engine (using RPM and known efficiencies of the engine). So changing efficiencies (boost, exhaust, head porting,...) will throw off the calculation and hence fuel mixture. On a "Ford", like a Mustang, they are Mass/Flow, where a sensor on the intake side (MAF) determines the mass (using velocity and density). Changing efficiencies on this system will not have the same issues as long as all the air is drawn through the MAF. (the MAF will have limits though)
MBWorld Fanatic!
Joined: Jun 2009
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From: Cypress, TX
'06 E55, '15 Jeep SRT8, '94 Mustang GT
Think you are confused on Speed/Density versus Mass/Flow. Speed/Density calculates the mass of air entering the engine (using RPM and known efficiencies of the engine). So changing efficiencies (boost, exhaust, head porting,...) will throw off the calculation and hence fuel mixture. On a "Ford", like a Mustang, they are Mass/Flow, where a sensor on the intake side (MAF) determines the mass (using velocity and density). Changing efficiencies on this system will not have the same issues as long as all the air is drawn through the MAF. (the MAF will have limits though)
