Change that resistor in a box 'aka' tuning box for something that reconfigures the in gear torque limiters and increases boost and airflow limiter maps (all that is raised by a tuning box is fuel pressure, resulting in the engine running on the torque limiters) and you will be blown away by the improvement. An extra 60-70 ftlb is easily achievable and loads more mid range bhp.
I hear what your saying, and I would be tempted to have a remap, but due tot he frequency I change my vehicles it's value for money for me running a tuning box.
Mine isn't the cheapo 'resistor in a box' as you say, those types come with a load of problems !
Correct, my tuning box does up the fuel pressure, but it also increases the boost level too - and having had it checked by a local diesel tuner the cylinder temps ect.... Are all optimal, no undue stresses and no limits being being archived on fuelling side of things, likewise with the boost.
I agree, yes, from a remap I could get more out of the engine, but the ZF box coupled to the 35d engine would be on the manufactures (ZF) limits !
As I do allot of miles and at time drive spiritedly, I have no wish to broach these limits as I would like longevity out of the car and associated parts.
I bought the car with circa 40k on it, and have done nearly an additional 60k in under two years, with only the seals in one of the boost hoses needed to be replaced.
Never hadley DPF issues, never had a DPF light, the regen's occur as they should and I have literally had no issues
The only thing I have had done to the car was a full software update from BMW as it was on the original 2007software and I thought it wouldn't hurt to update it :D
Just out of curiosity, the price for a remap of my car, E92 335d would be what from yourself ???