W211 AMG Discuss the W211 AMG's such as the E55 and the E63

My 55 is just… slower than other ones

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Old Apr 6, 2023 | 09:13 PM
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E55 amg
My 55 is just… slower than other ones

Hello, when I bought my e55 2 years ago I thought it was running good for stock, although not gonna lie I was underwhelmed. I added a 77mm pulley, 82mm throttle body, ECU tune, TCU Tune, 550 injectors, XL heat exchanger and more cooling and raced a BONE STOCK CL55 and he beat me in a roll race, he didnt gap but it was close and he pulled away. .

Now after driving other stock 55’s they are much much faster than mine was stock, they feel like how mine is now. Which is ridiculous because the modifications should make it way faster than any stock car.

I have replaced coil packs, plug wires, spark plugs, all fluids, basically any maintenance you can think of, I did it. My IATs stay relatively low, they dont go above 118. It is NOT heat soaked, the supercharger DOES ENGAGE. so I’m really angry. Could it be a low engine compression issue?? I really don’t know why my car is slower than other 55’s.

it is a 2003 model, build date is 12/02. Could that also be why?

Last edited by justintrain; Apr 6, 2023 at 09:17 PM.
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Old Apr 6, 2023 | 09:19 PM
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Sounds like a tune issue.
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Old Apr 6, 2023 | 09:22 PM
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E55 amg
Originally Posted by Highline-Autos.com
Sounds like a tune issue.

I thought this was the case as well, I bought three different tunes from three different companies and they all yielded the exact same results. Also,when I was stock the car was a good bit slower compared to other stock cars. I did not know it at the time, I thought mine was running perfect because it never felt rough or anything
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Old Apr 6, 2023 | 09:36 PM
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e55 AMG
check the compression.
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Old Apr 6, 2023 | 09:48 PM
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1999 C43 AMG, 2005 E55 Wagon
Don't 2003-2004 E55's have a lower displacency supercharger?
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Old Apr 6, 2023 | 09:50 PM
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E55 amg
Originally Posted by Sulaco
Don't 2003-2004 E55's have a lower displacency supercharger?
yes but the CL I raced was a 2003 as well
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Old Apr 6, 2023 | 09:52 PM
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why don't you put that thing on dyno?
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Old Apr 6, 2023 | 10:04 PM
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Originally Posted by BMW Owner
why don't you put that thing on dyno?
+1
Put it on a Dyno and obtain verifiable info on the torque curve.
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Old Apr 6, 2023 | 11:24 PM
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This place is a joke.
How old is the fuel pump and fuel filter? Stock exhaust?
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Old Apr 6, 2023 | 11:28 PM
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E55 amg
Originally Posted by E55Greasemonkey
How old is the fuel pump and fuel filter? Stock exhaust?
the fuel pump was replaced in 2018 according to my car fax. The exhaust has secondary cats and resonators straight piped. With higher flowing primary cats
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Old Apr 7, 2023 | 04:26 AM
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2006 E55 AMG Kombi
Have you ever replaced the intake air temp sensor? Replacing mine yielded a huge power bump, butt-dyno estimate would be in the neighborhood of 40-50 HP. It's a cheap part and a super easy 15 minute install with basic hand tools only.

They go bad progressively over time, and register higher than actual intake air temps as they do, throwing off your tune in the process. Well worth replacing to be sure.
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Old Apr 7, 2023 | 05:32 AM
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I made a video for that, easy install indeed.


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Old Apr 7, 2023 | 09:45 AM
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ez-go
Mine was a sticky valve.
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Old Apr 7, 2023 | 10:47 AM
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2005 e55 AMG
Do a compression test first to see how healthy the engine is. If it's down it does not matter what you do,it will not make optimum power.....ever !
If it's good get a data logger. I am still baffled by how many guys just dont do it and have no idea whats going on with the engine.
When logged you can go in and SEE exactly what the ECU/ENGINE was doing and you can go from there.
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