*** Does your car "fall on its face" during part-throttle acceleration? ***
#76
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#79
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E55 / E350 Sport
#80
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So far - fantastic. Car is at CPT right now having Kleemann mufflers installed... got tired of car being too quiet. Gonna hit the dyno on Saturday see if the new VRP/Powerchips software is making more power than before along with mufflers. Have NOT had throttle cut once yet, since ECU update from VRP/Powerchips
-m
-m
#82
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2003 E55 AMG
I know alot of you guys have symptoms that "mimic" this real problem, but, the only way to know for sure if you are suffering from P2040D is to hook up STAR DAS and do a test on the ME2.8. If it returns this code then you have the problem.
My car is now fixed; the load limit is finally gone (after more than 1yr of chasing it down). Marcus' car is fixed; the load limit is gone.
My car is now fixed; the load limit is finally gone (after more than 1yr of chasing it down). Marcus' car is fixed; the load limit is gone.
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E55 / E350 Sport
Took car to independent tuner / local MB experts... They ran the STAR Diag. and the car returned no codes. They said that many other customers with the E55 had similar complaints, but they would investigate.
Findings:
Supercharger belt in disrepair with missing "teeth" and supercharger (belt) tensioner pulley completely shot.
Fixed both ($600 parts and labor), car runs MUCH better, but still some very, very mild hesitation. Two of their techs test drove the car (as well as the shop owner), and they all concluded that they felt that car was running characteristically for a E55.
Somewhat disappointing... Asked about supercharger clutch. Said that the SC has an electromechanical clutch (much like an A/C condensor) that engages and disengages as deemed appropriate by the ECU. SC clutch checked, noted to be unremarkable.
I wish it were better, but I am satisfied with the answer and the outcome. Any suggestions?
JH
Findings:
Supercharger belt in disrepair with missing "teeth" and supercharger (belt) tensioner pulley completely shot.
Fixed both ($600 parts and labor), car runs MUCH better, but still some very, very mild hesitation. Two of their techs test drove the car (as well as the shop owner), and they all concluded that they felt that car was running characteristically for a E55.
Somewhat disappointing... Asked about supercharger clutch. Said that the SC has an electromechanical clutch (much like an A/C condensor) that engages and disengages as deemed appropriate by the ECU. SC clutch checked, noted to be unremarkable.
I wish it were better, but I am satisfied with the answer and the outcome. Any suggestions?
JH
#88
#89
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There has been a behaviour that has been plaguing some member cars for many months. Some of you complained about the throttle flaps closing for a split second and then re-opening on you during part throttle acceleration.
This behaviour doesn't occur if you start off and go directly to WOT, but if you are cruising around at part throttle and try to accelerate you will likely run into this if you have this problem in your car.
This is not a mechanical problem. It is attributed to the dreaded "Secondary Airpump Recall Flash" that many people went through last year. During this campaign MB added some code which implemented load limiting. (I know this has been posted many times in the past, but I am reiterating because I have some new information.). I am not sure if some of the code falls over onto the EGS module or if it is isolated to the ECU only.
There is some data to suggest that some cars still haven't been able to get rid of this load limit problem.
How do you know if you have this problem? Very easy to find out:
1) Go onto a stretch of road and maintain a constant speed (say 50mph)
2) Slowly depress the accelerator and work your way to WOT.
3) At some point during this process you should feel a sudden jerk. The sensation will be like the throttle body flap suddenly closed shut on you for a split second but the car will then keep going on its way.
Now, take the car to someone with a STAR DAS device and do a "Quick Test" on all the function groups. If you have this problem, Code P2040D ("Load Limit Active") should be stored in your ME2.8.
The thing to remember here is if you do a dyno pull, or 1/4mile run, or anything where you are going WOT right away you will not notice this. This behaviour seems to be isolated to part throttle only.
Now for some data:
- My personal ECU with the original VRP tune that was developed on RFlow's car through Active Autowerke has this problem (Code is constantly presenting itself). My car is a 2003.
- E55 Baller has K2 programming and I am sure if he checks he will see he has this problem. We all know Isaac's car is strong because it ran an 11.11 @ 125mph. Isaac's car is a 2004.
- Marcus with his VR550 has this code stored (we just found out today) and his VRP tune is the newer one developed with Powerchip. His car runs strong and dyno'd well. Marcus has a 2005.
3 different tunes, 3 different years, all the same behaviour, so its not related to 1 particular tuner or year of vehicle.
I am sure there are more of you out there but you just don't know it. It's very interesting that these load limits are still present at part throttle driving even though they were effectively removed from the ECU code during the tuning process.
Nate's blistering E55 does not have this problem but I had a new EGS put on his car with all the load limits removed.
I purposely left my own ECU alone because I have been systematically going through everything on the car (mechanical and software related) to try and figure out the source. I have eliminated everything except for the EGS. I am waiting on my EGS to arrive from Germany with all the load limits removed on it like we did for Nate. Once I put this back in my car I will verify if the P2040D goes away.
Either the EGS alone will resolve this, or the EGS and ECU both have to be matched up and revised to completely eliminate the problem. I will post more data as I find it.
If any of you have this behaviour please post up.. I'd like to get a greater sampling of data to see what software you are running and what year your car is.
This behaviour doesn't occur if you start off and go directly to WOT, but if you are cruising around at part throttle and try to accelerate you will likely run into this if you have this problem in your car.
This is not a mechanical problem. It is attributed to the dreaded "Secondary Airpump Recall Flash" that many people went through last year. During this campaign MB added some code which implemented load limiting. (I know this has been posted many times in the past, but I am reiterating because I have some new information.). I am not sure if some of the code falls over onto the EGS module or if it is isolated to the ECU only.
There is some data to suggest that some cars still haven't been able to get rid of this load limit problem.
How do you know if you have this problem? Very easy to find out:
1) Go onto a stretch of road and maintain a constant speed (say 50mph)
2) Slowly depress the accelerator and work your way to WOT.
3) At some point during this process you should feel a sudden jerk. The sensation will be like the throttle body flap suddenly closed shut on you for a split second but the car will then keep going on its way.
Now, take the car to someone with a STAR DAS device and do a "Quick Test" on all the function groups. If you have this problem, Code P2040D ("Load Limit Active") should be stored in your ME2.8.
The thing to remember here is if you do a dyno pull, or 1/4mile run, or anything where you are going WOT right away you will not notice this. This behaviour seems to be isolated to part throttle only.
Now for some data:
- My personal ECU with the original VRP tune that was developed on RFlow's car through Active Autowerke has this problem (Code is constantly presenting itself). My car is a 2003.
- E55 Baller has K2 programming and I am sure if he checks he will see he has this problem. We all know Isaac's car is strong because it ran an 11.11 @ 125mph. Isaac's car is a 2004.
- Marcus with his VR550 has this code stored (we just found out today) and his VRP tune is the newer one developed with Powerchip. His car runs strong and dyno'd well. Marcus has a 2005.
3 different tunes, 3 different years, all the same behaviour, so its not related to 1 particular tuner or year of vehicle.
I am sure there are more of you out there but you just don't know it. It's very interesting that these load limits are still present at part throttle driving even though they were effectively removed from the ECU code during the tuning process.
Nate's blistering E55 does not have this problem but I had a new EGS put on his car with all the load limits removed.
I purposely left my own ECU alone because I have been systematically going through everything on the car (mechanical and software related) to try and figure out the source. I have eliminated everything except for the EGS. I am waiting on my EGS to arrive from Germany with all the load limits removed on it like we did for Nate. Once I put this back in my car I will verify if the P2040D goes away.
Either the EGS alone will resolve this, or the EGS and ECU both have to be matched up and revised to completely eliminate the problem. I will post more data as I find it.
If any of you have this behaviour please post up.. I'd like to get a greater sampling of data to see what software you are running and what year your car is.
Also TCU can be programed and RPM limit moved...We have this done to one Evotech 55...it runs very strong..faster the CLK63 BS and new RS6...and CL65...
but what I really need to from you is to reply my e-mails ))) dont forget !!!
#90
MBWorld Fanatic!
You need to find this code or load limit in ECU...we had this problem with my Tiptronic TT...only after we removed it the car runned 0-60 in 2.4
Also TCU can be programed and RPM limit moved...We have this done to one Evotech 55...it runs very strong..faster the CLK63 BS and new RS6...and CL65...
but what I really need to from you is to reply my e-mails ))) dont forget !!!
Also TCU can be programed and RPM limit moved...We have this done to one Evotech 55...it runs very strong..faster the CLK63 BS and new RS6...and CL65...
but what I really need to from you is to reply my e-mails ))) dont forget !!!
so how is evotech still having problems or have they fixed them all and running good now?
also was this new RS6? how is the new one by the way?
#91
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2003 E55 & 2014 GL550
Heh Russ, was this really you against the Porsche?
Sure miss ya over here buddy!!
http://www.youtube.com/watch?v=VL5wG-4ITvg
Sure miss ya over here buddy!!
http://www.youtube.com/watch?v=VL5wG-4ITvg
#92
MBWorld Fanatic!
Actually it will happen on a supercharged car.
Cold air doesn't combust better it's DENSER, surge is a mass air issue NOT a pressure issue (Which is what you are assuming) Since the cold air is denser and the intercooler is more efficient at retaining that density you are hitting the mass load limits. Part throttle is easier to do it on since you have a higher intake velocity with reduced cylinder filling causing a surge condition due to the excess flow of the supercharger. Remember there is no wastegate to limit the flow rate to the compressor since it's flow rate is fixed to RPM.
Cold air doesn't combust better it's DENSER, surge is a mass air issue NOT a pressure issue (Which is what you are assuming) Since the cold air is denser and the intercooler is more efficient at retaining that density you are hitting the mass load limits. Part throttle is easier to do it on since you have a higher intake velocity with reduced cylinder filling causing a surge condition due to the excess flow of the supercharger. Remember there is no wastegate to limit the flow rate to the compressor since it's flow rate is fixed to RPM.
#94
MBWorld Fanatic!
#95
MBWorld Fanatic!
Rolling start mod E55 killed them all...but each race is different, need more testing...
#96
MBWorld Fanatic!
Heh Russ, was this really you against the Porsche?
Sure miss ya over here buddy!!
http://www.youtube.com/watch?v=VL5wG-4ITvg
Sure miss ya over here buddy!!
http://www.youtube.com/watch?v=VL5wG-4ITvg
No man I leave in Russia not in Arab country...
I miss U too man...Please buy Porsche, soon and I will help you out with tuning...Opening my tuning company soon )))
Missthis forum as well...I still think 55 crew are the best people on the NET
#97
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Kleemann S55 AMG
I have an '01 S55 with the Kleemann supercharger and headers and I have this issue as well. It isn't just when it is cold, but all the time. The dealer flashed over the Kleemann code, so I had to send the ECU back to Kleemann to have it reprogrammed with their code a few months ago, yet I still have this problem. What is the procedure to go about getting this fixed?
#98
MBWorld Fanatic!
I have an '01 S55 with the Kleemann supercharger and headers and I have this issue as well. It isn't just when it is cold, but all the time. The dealer flashed over the Kleemann code, so I had to send the ECU back to Kleemann to have it reprogrammed with their code a few months ago, yet I still have this problem. What is the procedure to go about getting this fixed?
#100
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2008 BMW 135i
I know alot of you guys have symptoms that "mimic" this real problem, but, the only way to know for sure if you are suffering from P2040D is to hook up STAR DAS and do a test on the ME2.8. If it returns this code then you have the problem.
My car is now fixed; the load limit is finally gone (after more than 1yr of chasing it down). Marcus' car is fixed; the load limit is gone.
My car is now fixed; the load limit is finally gone (after more than 1yr of chasing it down). Marcus' car is fixed; the load limit is gone.