pros and cons to locking up an E55 supercharger clutch
Member
Joined: Oct 2012
Posts: 230
Likes: 1
From: Santa Monica
2005 e55
before you guys melt your motors spinning the blower all the time think of this,our ecus basically are NA and Bossted ecus,we run very high timing when the blower is off and once on load the ecu pulls timing big time and dumps a **** load of fuel.
now lets say you are crusing at 40mph in 4th gear with 4 people in the car and you have your blower making full boost and you give the car 10% throttle,guess what? you just ran 35D timing with almost zero fuel and put massive load on your engine with max boost!!!
do NOT run the blower all the time without a proper off boost tune
now lets say you are crusing at 40mph in 4th gear with 4 people in the car and you have your blower making full boost and you give the car 10% throttle,guess what? you just ran 35D timing with almost zero fuel and put massive load on your engine with max boost!!!
do NOT run the blower all the time without a proper off boost tune
this is a simple Speed density system. it runs off the map sensor if the map sensor is seeing full boost and you tip in throttle it should already be on the boost side of timing.
Last edited by groove66; Jan 8, 2013 at 10:59 AM.
MBWorld Fanatic!
Joined: Dec 2008
Posts: 2,190
Likes: 35
shrimp boat
before you guys melt your motors spinning the blower all the time think of this,our ecus basically are NA and Bossted ecus,we run very high timing when the blower is off and once on load the ecu pulls timing big time and dumps a **** load of fuel.
now lets say you are crusing at 40mph in 4th gear with 4 people in the car and you have your blower making full boost and you give the car 10% throttle,guess what? you just ran 35D timing with almost zero fuel and put massive load on your engine with max boost!!!
do NOT run the blower all the time without a proper off boost tune
now lets say you are crusing at 40mph in 4th gear with 4 people in the car and you have your blower making full boost and you give the car 10% throttle,guess what? you just ran 35D timing with almost zero fuel and put massive load on your engine with max boost!!!
do NOT run the blower all the time without a proper off boost tune
When you cruising the by-pass valve would open like normal. When you get on it the by-pass valve would shut and boost would be build, again just like a normal operation.
Eleminate the clutch would only affect fuel economy and the longevity of the sc a bit. This is not trying to re-invent the wheel, it's meerly re-engineering what Weistec had done. Like I said, if Weistec want to be nice they CAN tune the car without the clutch no problem.
Senior Member
Joined: Oct 2011
Posts: 419
Likes: 3
From: Southern Maryland USA
06 E55 AMG, 13 C63 AMG
I guess I need to draw a picture or something.
The manifold pressure is controlled by the throttle. If the supercharger is spinning or not spinning the throttle still controls the manifold pressure. If the throttle is less than roughly 30% open the manifold will be in vacuum whether the supercharger is spinning or not.
There will not be boost in the manifold if the throttle is not open enough. It cannot grab air to compress. It is just that simple.
The manifold pressure is controlled by the throttle. If the supercharger is spinning or not spinning the throttle still controls the manifold pressure. If the throttle is less than roughly 30% open the manifold will be in vacuum whether the supercharger is spinning or not.
There will not be boost in the manifold if the throttle is not open enough. It cannot grab air to compress. It is just that simple.
Super Member
Joined: Nov 2006
Posts: 952
Likes: 9
From: NJ/Greece
2006 CLS55 & 2002 SL55 (R129) Silver Arrow
My N/A SL500 has a clutch less blower on it. At a 40mph cruise she's at around -15lbs of vacuum. The rotors are definitely spinning, but there's no boost.
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Joined: Dec 2011
Posts: 1,485
Likes: 26
From: new ringgold pa
99 ford lightning
I would imagine calculated load based on tp is what changes the fuel and timing parts of the tune so a direct drive wouldnt really be a issue as long as you can figure the bypass in the tune.
Member
Joined: Feb 2010
Posts: 162
Likes: 1
From: Loveland, OH
2019 S63, 2006 CLS 55, 2005 Infiniti QX56, 1994 Softail Springer
I know this is a very old thread, but can you tell me where the bypass valve is located on a 55 engine? I have a mechanic telling me there is no such thing.
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Senior Member
Joined: Sep 2015
Posts: 367
Likes: 36
From: Dawesville, West Australia
2006 E55, 2006 SL55, 2006 LS7 Ute
I have only a 83mm fixed pulley and a Race IQ tune. Massive increase in seat of pants pull confirmed by a 4.5 sec 100-160kph pull compared to 5.2 sec stock. Times by V-box. My stock pulley broke and damaged my hoses etc. with only 100k km on the car. Throttle response is better.
