Quote:
Originally Posted by Razor2010
The information on my car shows a B48D / B48B20O1, not sure where the B46D is coming from at your end? Edit: I see that the 6 or 8 is depending on NA or outside of NA as you stated for the SULEV. See image below. I am obviously outside of NA hence the 8.
Also, don't understand the logic here. B58 is running 382 HP and 369 TQ, so 2 litres / 3 litres or 4 cyl / 6 cyl X 382 and 369 = 255 HP and 246 TQ. HP is almost bang-on and we are actually quite lucky to have 295 TQ based on our engine being down 1 litre and 2 cylinders on the B58. This engine is being pushed pretty hard right from factory so not sure how much room it has in a hot climate running 95 RON / 91 API octane, my guess is not much room at all safely.
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That’s because all these engines, the B46D, B48, the B58, are all great engines that BMW gave very conservative numbers on because of emissions requirements. This is the worst case scenario for B46D owners, because they added SULEV parts in the exhaust and engine, in order to hinder the performance of the car even more. All of the engines are heavily detuned because of emissions. I can see why going Stage 1 can be bad for the engine because there is too much built up pressure inside the turbo and DP due to the catalytic converter. You’re adding too much boost, but the cats are still in, therefore worse for the turbo. But if you added a catless downpipe and upgraded charge pipes, always ran 91 V-Power from Shell (In Canada so that is probably the best gas I can get from pump), and then put the car on Stage 2 OTS tune from BM3, it would be okay for the engine. And if you did your oil changes every 5K and changed to 5W40 instead of 0W20, I think all of this should be more on the reliable side. BM3 OTS maps are meant to be mosty very reliable compared to other custom maps or tunes.