Not to stir the pot, but my dealer has stopped doing Dinan upgrades as well, both software and hardware. The comment I got at the time was that BMW was coming out with their own performance products. While only the E90 has offerings so far, my dealer indicated that stuff for the E60 and others was coming. I have no other knowledge beyond this but it would not surprise me to see BMW trying to take the market from Dinan for itself. We'll see what really happens...

 

I was told by my dealer that they have stopped doing Dinan flashes because of emissions issues. That information was supplied to all service managers at the dealership today. The person I talked to said that the changes created by the reflash may be illegal as far as emissions are concerned. I don't know if he is reffering to federal or state emissions. I also read the same thing on N54tech.com coming from a dealer in another part of the country.

 

I think the turbo lag misnomer is getting misstated because its misunderstood. A turbo has an turbine in the exhaust header and when the exhaust gases pass the turbine it spins the turbine exactly like when you blow on a pin wheel. Turbo lag is the time it takes for the exhaust gases to build velocity, which spins the turbine, which is attached to the impeller that spins and compresses the air intake charge.
Two things made turbo lag very pronounced in the last generation of turbo engines. One was the mass of the turbine and impeller, which were relatively very heavy. Second was the time needed to increase the exhaust velocity needed to create boost.
BMW in the current generation turbo engine has utilized very light weight material for the turbine and impeller and using two smaller turbos instead of one larger one, thus drastically reducing mass and inertial forces (a body at rest tends to want to stay at rest). BMW has also created a controlled explosion in the exhaust track creating instant increase in exhaust gas velocity to jump start the turbos when boost is needed.
Those of you stating that you sense turbo lag are being confused by the smooth linear way the BMW turbo engine generates power. The torque curve is flat from about 1400 rpm to near redline so there is no peak or rush of power.
A normally aspirated engine when it comes on the CAM will feel like its producing a lot of power, buts that only because it fall short at every other RPM before and after it sweet spot power curve.
The valvetronic on the 545/550 was designed to help broaden the power delivery curve.

 

Ok, whatever he said.

I'll take the 550i, a lot less complicated.

 

I have the 535 xi with the aero kit and just installed the Dinan... The car looks great and screams, the acceleration from 50 on up is ridiculus, it makes passing on the highways fun and thus the ultimate driving machine

 

I would'nt get too fussed about the weight, it's not a significant amount and it's likely you would never feel it, especially with A/S, .................I like V8's. Torque, sound , overall performance but I'm sure that the i6tt is a pretty impressive power plant as well .................your call , but my nickle

 

Hey, us 535 guys do try to help I do agree, its complicated.

 

Very much appreciated.

 

Good Lord, this did turn into a p*ssing match!

They're both great cars everyone!

 

Ha!! Saw it coming, we've been down this path. But you're right, everyone just enjoy driving which ever car you have...