Loosing boost! Help me out!
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Joined: Jan 2010
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E55 K
Loosing boost! Help me out!
I am loosing boost. Can anybody help me out?
Or is it regular 12.3 psi boost by this modifications?
mileage: 25.000 miles
168 mm pulley
3 mm (0.12") milled of (supercharger pulley)
82 mm TB
kleemann cams
longtube headers (supersprint)
cats delete
resonator delete
ECU
slip differential
3.06 differential
> only 12.3 psi boost
Or is it regular 12.3 psi boost by this modifications?
mileage: 25.000 miles
168 mm pulley
3 mm (0.12") milled of (supercharger pulley)
82 mm TB
kleemann cams
longtube headers (supersprint)
cats delete
resonator delete
ECU
slip differential
3.06 differential
> only 12.3 psi boost
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From: Bloomingdale,IL
2004 W211 E55K, GL550
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From: NJ/Greece
2006 CLS55 & 2002 SL55 (R129) Silver Arrow
I dont think your loosing boost. Your particular mods have made your engine more efficient (especially the headers and cams).
If you want more boost I'd go with a larger crank pulley.
If you want more boost I'd go with a larger crank pulley.
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From: Long Island, NY
Whatever we're tuning!
I am loosing boost. Can anybody help me out?
Or is it regular 12.3 psi boost by this modifications?
mileage: 25.000 miles
168 mm pulley
3 mm (0.12") milled of (supercharger pulley)
82 mm TB
kleemann cams
longtube headers (supersprint)
cats delete
resonator delete
ECU
slip differential
3.06 differential
> only 12.3 psi boost
Or is it regular 12.3 psi boost by this modifications?
mileage: 25.000 miles
168 mm pulley
3 mm (0.12") milled of (supercharger pulley)
82 mm TB
kleemann cams
longtube headers (supersprint)
cats delete
resonator delete
ECU
slip differential
3.06 differential
> only 12.3 psi boost
Just enjoy it!!
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Thread Starter
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Joined: Jan 2010
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E55 K
Yes! It is rare!
The IAT is perfect. I am running a modified KC.
Before mods I am running a 172 mm pulley with 15.2 psi (maximum)
I am very unhappy. I don´t know if the new mods swipping the boost.
12.3 psi makes me dissatisfied!
Only by running a 168 mm pulley I got 13.8 psi (without cams and headers).
MBWorld Fanatic!
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From: Atlanta
2006 E55 AMG
Who cares how much boost you make man, as long as your HP has increased under the curve since your new round of mods, that is all that matters. You are probably making more power now with less boost, and that is exactly what you should strive for!
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From: Vancouver, BC
CLS55 AMG
i think you are feeling no power after 180 mph is because of the 3.06 rear diff... if you had the regular 2.55 rear diff, you top speed would be better... 3.06 is better for acceleration
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From: NJ/Greece
2006 CLS55 & 2002 SL55 (R129) Silver Arrow
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E55 K
I don´t talk about about top speed. Top speed is 202 mph with 3.06.
There is no power and by running 3.06 instead of 2.65 is more advantageous to climb fast to top speed.
For about 4 weeks my car was running stronger with the same mods.
There is no power and by running 3.06 instead of 2.65 is more advantageous to climb fast to top speed.
For about 4 weeks my car was running stronger with the same mods.
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From: The Granite State
.
What sort of RPM are you at at 180MPH? Are you doing any data logging to capture ignition timing, IATs, etc? I'm surprised that there are no fuel system mods in your list...... Long, top-gear pulls at WOT are pretty tough on the stock fuel system. I wonder if you are either running out of fuel or the injectors are at 100% duty cycle (static) at those kinds of speeds.
-G
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From: Puerto Rico
2005 E55 AMG
The numerically higher rear gear should make the car pull harder in top gear... He is just trading odd some top-end MPH.
What sort of RPM are you at at 180MPH? Are you doing any data logging to capture ignition timing, IATs, etc? I'm surprised that there are no fuel system mods in your list...... Long, top-gear pulls at WOT are pretty tough on the stock fuel system. I wonder if you are either running out of fuel or the injectors are at 100% duty cycle (static) at those kinds of speeds.
-G
What sort of RPM are you at at 180MPH? Are you doing any data logging to capture ignition timing, IATs, etc? I'm surprised that there are no fuel system mods in your list...... Long, top-gear pulls at WOT are pretty tough on the stock fuel system. I wonder if you are either running out of fuel or the injectors are at 100% duty cycle (static) at those kinds of speeds.
-G
As for the fueling, he must be running SOMETHING other than stock. I have a lot less stuff than he does and my car was maxed out on the stock fueling.
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E55 K
The numerically higher rear gear should make the car pull harder in top gear... He is just trading odd some top-end MPH.
What sort of RPM are you at at 180MPH? Are you doing any data logging to capture ignition timing, IATs, etc? I'm surprised that there are no fuel system mods in your list...... Long, top-gear pulls at WOT are pretty tough on the stock fuel system. I wonder if you are either running out of fuel or the injectors are at 100% duty cycle (static) at those kinds of speeds.
-G
What sort of RPM are you at at 180MPH? Are you doing any data logging to capture ignition timing, IATs, etc? I'm surprised that there are no fuel system mods in your list...... Long, top-gear pulls at WOT are pretty tough on the stock fuel system. I wonder if you are either running out of fuel or the injectors are at 100% duty cycle (static) at those kinds of speeds.
-G
At 180 mph exactly 6000 U/min
At 192 mph exactly 6400 U/min
This is correct. Higher gears make the car accelerate faster in every gear at every rpm, they just limit the top speed ( this is without discussing wheel spin and fuel economy ).
As for the fueling, he must be running SOMETHING other than stock. I have a lot less stuff than he does and my car was maxed out on the stock fueling.
As for the fueling, he must be running SOMETHING other than stock. I have a lot less stuff than he does and my car was maxed out on the stock fueling.
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From: NJ/Greece
2006 CLS55 & 2002 SL55 (R129) Silver Arrow
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From: Puerto Rico
2005 E55 AMG
You REALLY need to datalog and you REALLY need injectors.
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From: murfreesboro,tn
2003 porsche 996 turbo
amazing thing these motors, with my v/6 i push 16 psi avg and 19 psi on a cold day. stack the pullies and you get 25 psi!!
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E55 K
the LSD is from wavetrac. How it made to plays nice with the TCU ask my mechanic at www.sportwagenwerk.bcd-ost.de and www.vortrieb-dresden.de
The oem boost is already 11.6 psi.
By running a 172mm for month ago I had a peak of 15.2 psi on dyno.
You have no fueling mods? You can tell the ECU to run rich but our injectors are pretty small so they max out at about 500-520whp. Any higher than that and you start to run lean. You have a lot of mods which should put you at around 550whp I'd think, and without any fueling mods I bet you are running pretty lean and the car is pulling lots of timing which could explain your car running slower up on top.
You REALLY need to datalog and you REALLY need injectors.
You REALLY need to datalog and you REALLY need injectors.
www.sportwagenwerk.bcd-ost.de
Last edited by lorie; Apr 14, 2012 at 10:05 AM.
