dvdcore

No, i have not found a solution yet.
I will take it soon to another tuner and do some dyno runs with it, to analyze more what happens when going in 5th at around ~230kph

Tiago

That problem also appeared on my car after the DPF removal. Exhaust and intercooler put my car at 375hp level and after adjusting the ecu it went to 404hp. The tuner made a OBD scan and it showed a MAF problem but i forgot the error code. I need to take it to local BMW dealer to see if it is really related with a faulty maf. I really need to solve this because the car now hits 230km/h in a blink of a eye and i can't play with the big sharks (stock cars at 400-500hp power range).

dvdcore

I had to replace the MAF too in the past, because of using a K&N filter. After installing a new one, the acceleration felt a bit more liniar.
That still did not solve the problem.

I know exactly what you mean. My 535d stays near an Audi R8 V8 4.2 from 100-190kph.
It does 100-200kph in ~12 seconds, i guess yours in 11s (same as m3 E92).
I see you have lots of mods installed, it would be nice if you can take a video of the acceleration.

Please keep me updated if you find the solution for the problem.

Tiago

If i find the issue i will tell you for sure. I miss the time when the car was able to hit 4400rpm in 6th and embarass some real sports cars.

Why did you change the torque converter? And why didn't you, during that process, added more clutch discs to reinforce the gearbox. This is a usual mod on heavily modded mercedes with big engines.

Liam

Keep me posted on this one; I'm having a similar issue; chipped 535d also going into limp mode at high speed - DDE throwing an error 428b charge-air pressure too high...

I'm pretty sure it's not the vacuum hoses as the whole turbo assembly including pipes was recently changed.

I also had a similar issue with my chipped 530d before this.

Cheers,
Liam

dvdcore

Well it started to have some slippage around 1200-1500rpms in 2nd and 3rd. When you pressed the gas pedal, the rev counter was fluctuating going 50-100rpm for 1-2seconds up and down in the above range, and then starting to move while going from torque converter to the clutch system. I repaired it a service that does only automatic gearboxes, and the guy from there told me he did some reinforcements on other boxes, but unfortunately he could not find the parts for my model.

Mine throws the same error:

I know from BMW documentation, that in every gear at around 3900rpm, the wastegate for the large turbo is opened, and some boost is bypassed.
Somehow our cars think they have too much boost at that point(3900rpm) in 5th , and fault the wastegate, and trigger the above error.

Some videos of the car in action:

Tiago

I found a bit odd that comment from an expert in automatic gearboxes. Maybe he didn't want to waste much time on research... ZF sells kits and spare parts for every of their gearboxes.

The 6HP26 of our cars has a tq limit of 600nm. The LCI version has the 2nd generation of the ZF, the 6HP28 that has the tp limit set in the Bentley Continental GTC at 700nm and has physically the same dimensions. Torque converter and clutch discs should be interchangeable.

There is also the 6HP34 which is capable to handle safetly with 850nm and belongs to the same 6 speed automatic gearboxes family.

dvdcore

Yes, i know about the TQ limitations of the gearbox and the other types. The TQ converter was changed more than 1 year ago, and no problems so far with the gearbox. The guy from the service told me to change the tranny oil at 50K miles intervals.

Anyway, hope to find on the Dyno why the car boost level readout goes up to 3.6 bars at 3900 rpm in 5th.

P.S: I noticed you are using 245/35 and 275/30 tires. I had the same setup before on M5 19" wheels, totally uncomfortable. Currently on the rear tires i have 273/35, and plan to put 245/40 on the front. It will reach the limit without rubbing.

Tiago

Our diff ratio is already the longest from all the 6AT 35d models. By increasing the tire diameter, it will also increase even more the speed per rpm, making it less responsive during the rpm climbing. In some cases with taller tires, it can occur some steering wheel vibrations at high speeds. I feel my car pretty comfortable even with all suspension mods and 19" wheels. More comfortable than with stock setup (suspension, Mtech 18" wheels, and Goodyear RFT). My stock shocks last only 80.000km and that is why it was replaced with the Konis. Have you ever check the shocks wear condition?

sanjsanj

Guys....I was reading somewhere that removal of the DPF could cause over-spooling of the turbo, because of the change in pressure... which could cause a limp mode. I've noticed both of you have removed your DPFs, so maybe this is the cause?