13.7 PSI Max boost is this normal
#1
Member
Thread Starter
13.7 PSI Max boost is this normal
I purchased a 2005 e55 a few months back and just did some logging and saw that the car was making about 13.7psi of peak boost. I'm trying to figure out if the car was previously tuned or had a pulley installed and wanted to get some feedback to what you guys think the previous owner did to the car. I didn't want to buy something I didn't need like a new pulley if it already has one.
Thanks!
Thanks!
#3
MBWorld Fanatic!
It has a pulley with that boost. The sc pulley is fairly easy to recognize. Google it for pics. The crank pulley you will have to measure in Mm's
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#8
Senior Member
As Jerry explained to me, peak boost will not be seen until the top of 5th gear which I doubt anyone has done on the street. As I see it, for a given blower rpm, boost correlates to the back pressure the intake charge sees. The higher the load the slower the rpm build rate and thus higher back pressure resulting in higher boost. In the lower gears the rpm builds rapidly, back pressure is much less. My own SL55 with 77mm pulley, in 3rd gear runs to redline, only sees 12.7psi. I am confident it get to 15psi in 5th. Please correct if necessary people.
#12
Senior Member
#13
#14
Senior Member
The log shows my boost drops off at higher rpm in 3rd gear which conflicts with what Hulk said that it happens at the top of 3rd gear. Eurocharged claim 15psi for the stage 3 kit with TB and headers and only an 83mm pulley and I have a 77mm pulley which Jerry tuned for. I asked Jerry all of this but still remain in the dark now. I have a V-box performance logger and from that I am very happy with how my car is performing. So what is the truth about boost levels in these cars?
#15
The log shows my boost drops off at higher rpm in 3rd gear which conflicts with what Hulk said that it happens at the top of 3rd gear. Eurocharged claim 15psi for the stage 3 kit with TB and headers and only an 83mm pulley and I have a 77mm pulley which Jerry tuned for. I asked Jerry all of this but still remain in the dark now. I have a V-box performance logger and from that I am very happy with how my car is performing. So what is the truth about boost levels in these cars?
#21
Senior Member
#22
Senior Member
Eurocharged Performance Stage 3 Power Package
Make:
Mercedes Benz
Model:
55 Series AMG 5.5 V8
Series:
W211
Years:
2003-2006
Flash Type:
OBDII
Mygenius Compatible:
Yes
Dealer Flashable:
Yes
Stock Eurocharged
Peak Power (bhp) 469 642
Peak Torque (lb-ft) 516 696
Speed Limiter* (mph) 155 200
Rev Limiter* (rpm) 6300 6700
Boost (psi) 11.2 15.0
Package Includes
Eurocharged 55 Series Performance Engine Software
Eurocharged 55 Series Performance Transmission Software
Eurocharged Supercharger Pulley with a Eurocharged 180mm Crank Pulley Kit option to buy
Eurocharged Shorty Headers
82mm Throttle Body Kit
Injectors
55 Series Heat Exchanger
Johnson CM30 I/C Pump
#23
That description is for the optional 180 mm crank pulley that adds 400 dollars to that package. I think they should make it more clear but I asked the questions when I was ordering things and that's what it means.