Dinan sells flash tunes. It is in his best interest to put piggybacks down and make them appear cheap or inferior. However, he is right that flash tuning allows a greater degree of accuracy and it is more difficult. Full control of a BMW DME through flashing is harder to achieve than using a piggyback to alter the signals the ECU sees.
There are merits to both approaches including negatives to both approaches. BimmerBoost features vendors that sell products based on both tuning approaches. Steve Dinan does not mention any tuners using both approaches simultaneously omitting a vital area that should be included in his argument. He also does not mention any of the plusses to a piggyback that his flash tunes can not match such as changing boost maps on the fly or meth injection flow safeties. Some tuners are readily combining both approaches to get the best of both worlds so to speak.
Steve says the ECU is 'lied to' by piggybacks. Saying it is lying rather than modifying the signal is excessively negative terminology that is not really appropriate from a professional. He also states when the boost is raised from 9 psi to 14 psi in his example the car is using fuel for 9 psi instead of 14 psi and timing for 9 psi instead of 14 psi. The ECU then is forced to compensate.
The factory DME's are capable of adjusting fuel and timing on the fly with the piggybacks. This seems like an odd scare tactic from Dinan considering the amount of miles BimmerBoost members have successfully logged with piggyback tunes. Additionally, even without a piggyback tune the stock DME in modern BMW's is constantly adjusting timing and boost. What does he thinks happens when the cars go into high elevation?
His points about the transmission slipping and the stability control not working are comments that are really reaching. BimmerBoost has yet to see a piggyback user lose their stability control or have the trans slip for any reason other than too much torque thanks to the tune.
Steve is right that he has a large computer science department at Dinan. He hires some very talented students from top engineering schools to work for him paying them large salaries. He has some very powerful computers working 24/7 at cracking BMW DME's. However, even he does not have control of all the functions of the factory DME in modern BMW's so slighting piggybacks for not having full control either seems unfair. Why not let the DME do the functions it does best and alter only those that need to be altered? A piggyback does that and his flash tunes also do that. They just go about it in different ways.
Dinan says they can do things others can not. BimmerBoost has yet to see Dinan do anything on par with other tuners in the street BMW scene. His offerings are consistently outperformed for less money. Yes, he cracked the N63 V8 quickly but since then so have others either thanks to help from someone inside BMW or by getting their hands on the codes in whatever manner they did. What is it Dinan can do that anyone else can't exactly? Where are their projects that blow everyone else away? What performance records do any of their street cars actually hold?
Watch the video and come to your own conclusion.