View Poll Results: Its the boost okay?
Good boost
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E55Amg Low boost
Thread Starter
Junior Member
Joined: Jun 2024
Posts: 31
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E55AMG
E55Amg Low boost
Hello im new on the forum so i have the e55 amg 2005
With this mods:
76mm sc pulley
Long Tube Headers
And secondary Heat Exchanger and Primary XL Heat Exchanger
im only hiting 12.57 psi on 3rd gear and 13 psi on 4th gear its my boost okay or where its the problem
im doubting on the obdII cuz i measured the boost on 2 diesel cars and they both hit 22 psi one its bone stock and the other one its 450hp i have used the torque pro app
So its my boost okay if not where its the issue and its not to hot here 22 degre celsius and 18m above sea level please help
With this mods:
76mm sc pulley
Long Tube Headers
And secondary Heat Exchanger and Primary XL Heat Exchanger
im only hiting 12.57 psi on 3rd gear and 13 psi on 4th gear its my boost okay or where its the problem
im doubting on the obdII cuz i measured the boost on 2 diesel cars and they both hit 22 psi one its bone stock and the other one its 450hp i have used the torque pro app
So its my boost okay if not where its the issue and its not to hot here 22 degre celsius and 18m above sea level please help
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Joined: Aug 2003
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E55, GLS450, GL63, GLE350
You are aware that boost is a measure of resistance, right? Long tube headers will cause a reduction in boost pressure but create more hp. In addition, you have a positive displacement supercharged so the boost will typically be less than a turbocharged engine.
Thread Starter
Junior Member
Joined: Jun 2024
Posts: 31
Likes: 1
E55AMG
im not saying that i have to make the same boost as them but i think that its not measuring right
because why the 2 diesel cars made the same amount of boost when one was stock and the other was 450hp diesel car in the dyno that diesel car it made 34.8 psi
so all im asking its my boost level okay on my e55 with my current setup or it should be higher or my obdII its not reading right
Last edited by E55amg01; Jun 15, 2024 at 07:29 PM.
MBWorld Fanatic!
Joined: May 2022
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From: The Netherlands
2005 CLS55 AMG W219 C219
My stock CLS55 is making about 0.6-0.7 BAR (psi) of boost. You cannot compare this supercharged car to diesel turbocharged engines, they will be making a lot more boost.
Also @BlownV8 is right, the longtubes will cause a reduction in boost but will make more power. If you do the Needswings intake plenums, you will also lower boost, but will make more power as it becomes more efficient.
[edit]
Boost does not equal a certain horsepower...
Also @BlownV8 is right, the longtubes will cause a reduction in boost but will make more power. If you do the Needswings intake plenums, you will also lower boost, but will make more power as it becomes more efficient.
[edit]
Boost does not equal a certain horsepower...
Last edited by nd-photo.nl; Jun 16, 2024 at 03:17 PM.
MBWorld Fanatic!
Joined: Aug 2003
Posts: 8,882
Likes: 1,214
From: In my garage
E55, GLS450, GL63, GLE350
Yes, it is really a measure of what your engine can't flow or resistance to flow. Increase flow and you reduce boost. Lower the intake temperature and you will also lower the boost pressure. Also, if you beat the air to death and don't have proper cooling, increased boost can lower power. You have to understand all the inputs, resistance to flow, and cooling abilities before you can understand the relationship between boost and horsepower. So, the answer the question of is the boost pressure too low, well that depends.
Last edited by BlownV8; Jun 16, 2024 at 04:03 PM.
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2005 e55 AMG
Boost can vary big time from car to car.
My boost at sea level in 50 degree air peaks at 16.5lbs and will drop to 14.5 or so at red line.
A hot day loses 1 lb across the board.
At the track it will peak at 15 and drop to 13 but that's also at 1,200 elevation. Even my Dyno day was only 12.8 at red line and 1k elevation.
Clearly the blower can not keep up with engine air flow and why it will drop in the top rpm curve.
My boost at sea level in 50 degree air peaks at 16.5lbs and will drop to 14.5 or so at red line.
A hot day loses 1 lb across the board.
At the track it will peak at 15 and drop to 13 but that's also at 1,200 elevation. Even my Dyno day was only 12.8 at red line and 1k elevation.
Clearly the blower can not keep up with engine air flow and why it will drop in the top rpm curve.
Thread Starter
Junior Member
Joined: Jun 2024
Posts: 31
Likes: 1
E55AMG
Boost can vary big time from car to car.
My boost at sea level in 50 degree air peaks at 16.5lbs and will drop to 14.5 or so at red line.
A hot day loses 1 lb across the board.
At the track it will peak at 15 and drop to 13 but that's also at 1,200 elevation. Even my Dyno day was only 12.8 at red line and 1k elevation.
Clearly the blower can not keep up with engine air flow and why it will drop in the top rpm curve.
My boost at sea level in 50 degree air peaks at 16.5lbs and will drop to 14.5 or so at red line.
A hot day loses 1 lb across the board.
At the track it will peak at 15 and drop to 13 but that's also at 1,200 elevation. Even my Dyno day was only 12.8 at red line and 1k elevation.
Clearly the blower can not keep up with engine air flow and why it will drop in the top rpm curve.
