Originally Posted by cls55

marcus
did they work on ecu or tcu?
i dont think the weather has any thing to do with what we have,i think its a boost related because mine does it in 2 celsius in winter and 50 celsius summer where i live.

Originally Posted by E55Pilot

it means the ECU saw too much boost

Originally Posted by OXOJE55

My car does the samething
I got tried explaining it to my SA. He said it was normal for the 55's acting that way.

Originally Posted by cls55

marcus
how is your car acting so far?any change in performance.

Originally Posted by fredxxx

Hello,

does someone has a solution for the problem.
I have it also ( ECU, 180 mm , separatly HE, Headers ), it is very bad in the higher speed.

bw
fred

Originally Posted by jamusa

Try it with traction control off.....if it detects a slight wheel spin with the T/C on some car will "nose down" then recover once the car get traction.

Originally Posted by jhisghman

Findings:

Supercharger belt in disrepair with missing "teeth" and supercharger (belt) tensioner pulley completely shot.

Originally Posted by vrus

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.

Originally Posted by E55 RUSS

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 !!!

Originally Posted by E55Pilot

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.

Originally Posted by Jakpro1

No Code 3 belt wrap for E55, just C32's.

Bummer too.

VRP belt wrap worked perfect on some....not so good on others.

I threw belts constantly.

Originally Posted by Zod

Russ lives!

so how is evotech still having problems or have they fixed them all and running good now?

NO too sure...Ok I think...we will never know the truth about any tuners )))


also was this new RS6? how is the new one by the way?

Originally Posted by Jakpro1

Heh Russ, was this really you against the Porsche?

Sure miss ya over here buddy!!

http://www.youtube.com/watch?v=VL5wG-4ITvg

Originally Posted by dkinder

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?

Originally Posted by E55Pilot

Findings: You got fleeced out of $600, Our belts are flat, not cog belts, there are no "Teeth"

Originally Posted by vrus

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.