Will Stock E55 Injectors Work On A C55?
MBWorld Fanatic!
Joined: Mar 2004
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From: North NJ
2002 C32 AMG, 2013 GLK 350/4, 2015 E63S AMG Wagon
Please don't see this as an attack but for the sake of discussion. Here is what will happen if the injectors were used on a stock M113- I don't know the flow rates but taking what ZAYED has mentioned.
The ecu thinks it has 283cc injectors so knows just how many milliseconds of duty to give at any particular throttle position, rpm and MAF reading. The ecu is calibrated to the 283cc injector. You have 396/283= 1.4x larger injectors so the engine will be receiving approximately 40% more fuel than was intended. This will wash the oil film from the cylinder walls causing scoring, it will foul the spark plugs, it will ruin the cats and also the oxygen sensors. Power will be much reduced.
Some of this effect can be tuned out by adjusting the fuel tables but I don't know if it could compensate for the extreme difference. I know the supercharged guys have a lot of trouble with adjusting the resolution of the stock MAF. Even so, no one is wanting to spend heaps of money on tuning to get back to where they were before.
The other thing to consider is that most OEM applications have significant head room as far as injectors go. They usually only run somewhere around 60-80% of maximum fuel flow rate when the engine is making full power. This means that there is still a lot of scope for increasing power without needing new injectors. This is more than enough for headers, intake, port/polishing, cams, ecu tuning, almost anything on an NA engine. Of course when you increase your volumetric efficiency 50-100% with turbos or superchargers then that head room, is instantly gone and 400cc and larger sized injectors are needed.
The ecu thinks it has 283cc injectors so knows just how many milliseconds of duty to give at any particular throttle position, rpm and MAF reading. The ecu is calibrated to the 283cc injector. You have 396/283= 1.4x larger injectors so the engine will be receiving approximately 40% more fuel than was intended. This will wash the oil film from the cylinder walls causing scoring, it will foul the spark plugs, it will ruin the cats and also the oxygen sensors. Power will be much reduced.
Some of this effect can be tuned out by adjusting the fuel tables but I don't know if it could compensate for the extreme difference. I know the supercharged guys have a lot of trouble with adjusting the resolution of the stock MAF. Even so, no one is wanting to spend heaps of money on tuning to get back to where they were before.
The other thing to consider is that most OEM applications have significant head room as far as injectors go. They usually only run somewhere around 60-80% of maximum fuel flow rate when the engine is making full power. This means that there is still a lot of scope for increasing power without needing new injectors. This is more than enough for headers, intake, port/polishing, cams, ecu tuning, almost anything on an NA engine. Of course when you increase your volumetric efficiency 50-100% with turbos or superchargers then that head room, is instantly gone and 400cc and larger sized injectors are needed.
Thread Starter
Senior Member
Joined: Nov 2014
Posts: 299
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From: So.Cal.
2003 W211 E500
Thanks for all the feedback guys, I learned A LOT! The guy I bought the E55K's from was willing to take them back. Now, I need to find a set of pre owned C55 N/A injectors that are reasonably priced. The part number is 0280156074 or A1130780349
The reason that I am not using my old injectors is because I do not trust them. I changed the filter baskets which were not supposed to be changed (I had to mod the edges of the universal baskets because they did not fit). I also cleaned them the wrong way and used carb cleaner with the filter basket out. I learned from my mistake.
Thanks
The reason that I am not using my old injectors is because I do not trust them. I changed the filter baskets which were not supposed to be changed (I had to mod the edges of the universal baskets because they did not fit). I also cleaned them the wrong way and used carb cleaner with the filter basket out. I learned from my mistake.
Thanks
MBWorld Fanatic!
Joined: Aug 2011
Posts: 3,428
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From: New Zealand
I know but the original question was in regards to the C55. NA M113's do and when you kleemann supercharge them or retrofit an E55 supercharger you run out of sensor resolution from the increased airflow and there is only so much you can do to scale it down to make it work.
I would send them to a professional cleaning place. They will clean and flow test them. I know from when I used to mess around with toyota mr2's people used to use "witchhunter" for this service in the US. Otherwise you can probably also source injectors from the 03-06 CLK55 or 05-07 SLK55.
The reason that I am not using my old injectors is because I do not trust them. I changed the filter baskets which were not supposed to be changed (I had to mod the edges of the universal baskets because they did not fit). I also cleaned them the wrong way and used carb cleaner with the filter basket out. I learned from my mistake.
Thread Starter
Senior Member
Joined: Nov 2014
Posts: 299
Likes: 0
From: So.Cal.
2003 W211 E500
If you want it done right here locally (RC Engineering) its $191 US for the rebuild of all 8. Its $9 per injector to test. I don't really want to ship them out. I have a feeling that I messed them up so I would rather get ones that have not been messed with. I can get them remanufactured for $27.95 each on Carid.com and if I cannot find some soon I will probably do that. The only drawback to that is they charge you a core charge of $10 per injector and I don't have that extra money to lend out and wait to get back. Thanks for the suggestion.
Member
Joined: Sep 2022
Posts: 107
Likes: 1
E430
Please don't see this as an attack but for the sake of discussion. Here is what will happen if the injectors were used on a stock M113- I don't know the flow rates but taking what ZAYED has mentioned.
The ecu thinks it has 283cc injectors so knows just how many milliseconds of duty to give at any particular throttle position, rpm and MAF reading. The ecu is calibrated to the 283cc injector. You have 396/283= 1.4x larger injectors so the engine will be receiving approximately 40% more fuel than was intended. This will wash the oil film from the cylinder walls causing scoring, it will foul the spark plugs, it will ruin the cats and also the oxygen sensors. Power will be much reduced.
Some of this effect can be tuned out by adjusting the fuel tables but I don't know if it could compensate for the extreme difference. I know the supercharged guys have a lot of trouble with adjusting the resolution of the stock MAF. Even so, no one is wanting to spend heaps of money on tuning to get back to where they were before.
The other thing to consider is that most OEM applications have significant head room as far as injectors go. They usually only run somewhere around 60-80% of maximum fuel flow rate when the engine is making full power. This means that there is still a lot of scope for increasing power without needing new injectors. This is more than enough for headers, intake, port/polishing, cams, ecu tuning, almost anything on an NA engine. Of course when you increase your volumetric efficiency 50-100% with turbos or superchargers then that head room, is instantly gone and 400cc and larger sized injectors are needed.
The ecu thinks it has 283cc injectors so knows just how many milliseconds of duty to give at any particular throttle position, rpm and MAF reading. The ecu is calibrated to the 283cc injector. You have 396/283= 1.4x larger injectors so the engine will be receiving approximately 40% more fuel than was intended. This will wash the oil film from the cylinder walls causing scoring, it will foul the spark plugs, it will ruin the cats and also the oxygen sensors. Power will be much reduced.
Some of this effect can be tuned out by adjusting the fuel tables but I don't know if it could compensate for the extreme difference. I know the supercharged guys have a lot of trouble with adjusting the resolution of the stock MAF. Even so, no one is wanting to spend heaps of money on tuning to get back to where they were before.
The other thing to consider is that most OEM applications have significant head room as far as injectors go. They usually only run somewhere around 60-80% of maximum fuel flow rate when the engine is making full power. This means that there is still a lot of scope for increasing power without needing new injectors. This is more than enough for headers, intake, port/polishing, cams, ecu tuning, almost anything on an NA engine. Of course when you increase your volumetric efficiency 50-100% with turbos or superchargers then that head room, is instantly gone and 400cc and larger sized injectors are needed.
c32,c43,e55,cl55, clk55,s55 amg are all the same injectors and same tunes/computers as well. The size is 25 lb/hr !!
same goes for the e500,e430,s430,s500,cl500,sl500 these are the same ecu and all use 20.5 lb/hr injectors
i tune these ecu’s
Last edited by Gutentight11; Feb 4, 2024 at 12:53 AM.
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MBWorld Fanatic!
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05 c55 silver, 98 Imperial Red C43
Question for you @Gutentight11
If I want to swap injectors for my c43 w202, I was told injectors from a w208 clk430 would work. Is that not correct?
If I want to swap injectors for my c43 w202, I was told injectors from a w208 clk430 would work. Is that not correct?
Member
Joined: Sep 2022
Posts: 107
Likes: 1
E430
Question for you @Gutentight11
If I want to swap injectors for my c43 w202, I was told injectors from a w208 clk430 would work. Is that not correct?
If I want to swap injectors for my c43 w202, I was told injectors from a w208 clk430 would work. Is that not correct?
Member
Joined: Sep 2022
Posts: 107
Likes: 1
E430
Question for you @Gutentight11
If I want to swap injectors for my c43 w202, I was told injectors from a w208 clk430 would work. Is that not correct?
If I want to swap injectors for my c43 w202, I was told injectors from a w208 clk430 would work. Is that not correct?
Same goes for the e55/c55/s55,clk55 use the same computers, cams and injectors in theirs
