P30 package only building 13 psi???
Thread Starter
Member
Joined: Aug 2013
Posts: 131
Likes: 4
From: Reno, NV
2012 ML63 AMG, 2015 RAM 2500, 1968 Charger
P30 package only building 13 psi???
Hello gents, longtime member of the group, previous m156 owner, new to the ML63 AMG, m157 platform, having issues building boost. As noted, this is an ML63 AMG with an m157, P30 performance package, 2012 MY. My butt dyno had a hunch something wasn’t right, so I ordered up an AutoMeter dash link and it confirmed what the butt dyno feared - the m157 is only building about 13 psi at WOT. No codes present. I’ve had some experience with boots issues in the past; my brother has a Nissan Frontier with the supercharged V6, and it would randomly cut boost as the knock sensor began to fail. There were no codes present, but a gauge confirmed that the computer was limiting the boost to 2 psi when the max boost at WOT was supposed to be around 5 psi. Has anyone else experienced anything similar with their m157??? If so, what was the root cause? Any assistance would be greatly appreciated.
Thread Starter
Member
Joined: Aug 2013
Posts: 131
Likes: 4
From: Reno, NV
2012 ML63 AMG, 2015 RAM 2500, 1968 Charger
Thread Starter
Member
Joined: Aug 2013
Posts: 131
Likes: 4
From: Reno, NV
2012 ML63 AMG, 2015 RAM 2500, 1968 Charger
FYI - For those interested, I reached out to Weistec about this, looking for information before I spend $2k on a tune that may be ineffective if I had an underlying mechanical issue that was limiting boost. Per Weistec, 13.2 psi for my elevation (~5550ft) is nominal. Sea level vehicles will see nominal boost of 15-16 psi with peaks of near 19 psi. Per Weistec, if there were an issue reaching the target boost level, the ECU would log a P0299 code for "turbocharger underboost" and limit boost further to protect itself. Hope this helps anyone looking for info like I was.
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Junior Member
Joined: Feb 2012
Posts: 18
Likes: 0
From: Sacramento, CA
C63 Coupe
FYI - For those interested, I reached out to Weistec about this, looking for information before I spend $2k on a tune that may be ineffective if I had an underlying mechanical issue that was limiting boost. Per Weistec, 13.2 psi for my elevation (~5550ft) is nominal. Sea level vehicles will see nominal boost of 15-16 psi with peaks of near 19 psi. Per Weistec, if there were an issue reaching the target boost level, the ECU would log a P0299 code for "turbocharger underboost" and limit boost further to protect itself. Hope this helps anyone looking for info like I was.
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Junior Member
Joined: Sep 2016
Posts: 37
Likes: 6
From: Mercer Island
ML63 AMG BiTurbo
FYI - For those interested, I reached out to Weistec about this, looking for information before I spend $2k on a tune that may be ineffective if I had an underlying mechanical issue that was limiting boost. Per Weistec, 13.2 psi for my elevation (~5550ft) is nominal. Sea level vehicles will see nominal boost of 15-16 psi with peaks of near 19 psi. Per Weistec, if there were an issue reaching the target boost level, the ECU would log a P0299 code for "turbocharger underboost" and limit boost further to protect itself. Hope this helps anyone looking for info like I was.
Junior Member
Joined: Jul 2018
Posts: 36
Likes: 4
From: Seattle
CL600, ML550, SL65
FYI - For those interested, I reached out to Weistec about this, looking for information before I spend $2k on a tune that may be ineffective if I had an underlying mechanical issue that was limiting boost. Per Weistec, 13.2 psi for my elevation (~5550ft) is nominal. Sea level vehicles will see nominal boost of 15-16 psi with peaks of near 19 psi. Per Weistec, if there were an issue reaching the target boost level, the ECU would log a P0299 code for "turbocharger underboost" and limit boost further to protect itself. Hope this helps anyone looking for info like I was.
It appears they are telling you that the turbo controller is not altitude compensated? That seems unusual to me. At 5500' elevation you lose just under 2.5psi of atmospheric pressure. With the P30 package you should make 18.2psi above atmospheric. Using their reasoning (18.2-2.5=15.7psi) the numbers are still way off. Page 22 of Introduction of the New Generation of V-Engines 8-cylinder M 157 AMG, states "In this way the boost pressure of max. 1.0 bar
(1.3 bar in engines with Performance Package) relative to the environment..." Relative to the environment indicates this is an altitude compensating system. You should make the 18psi of relative boost above ambient conditions. That would be 18 + 2.5 (5500' altitude). The gauge is referenced to atmospheric pressure. Your absolute manifold pressure will of course be much higher.
Dave
Junior Member
Joined: Jul 2018
Posts: 36
Likes: 4
From: Seattle
CL600, ML550, SL65
Greetings:
I have an update gained from recent service at the MB dealer. I have a mechanic at the dealer that I trust completely. I was experiencing the "low boost" that has been mentioned earlier. He said that these vehicles on;y make about 0.9bar/900mb. I shared the info I read in the above-referenced MB publication. He researched it and found that the factory diagnostics show the 900mb id normal based on my VIN. I have a 2014 with the P30. It would appear that there is a large misconception regarding the boost pressure of the P30 equipped vehicles. I also noticed that the date of the M157 publication was 2010. He pointed out that low boost would have triggered an indicator light.
I'm still reading and researching.
Dave
I have an update gained from recent service at the MB dealer. I have a mechanic at the dealer that I trust completely. I was experiencing the "low boost" that has been mentioned earlier. He said that these vehicles on;y make about 0.9bar/900mb. I shared the info I read in the above-referenced MB publication. He researched it and found that the factory diagnostics show the 900mb id normal based on my VIN. I have a 2014 with the P30. It would appear that there is a large misconception regarding the boost pressure of the P30 equipped vehicles. I also noticed that the date of the M157 publication was 2010. He pointed out that low boost would have triggered an indicator light.
I'm still reading and researching.
Dave
