Originally Posted by agraham2252
I was looking at the specs yesterday for the 550i and the 550GT. For the 550i they say:
4.4-liter BMW TwinPower Turbo V-8, 32-valve 400-hp engine. Combines two turbochargers with variable valve control (Double-VANOS and Valvetronic) and high-precision direct injection
For the 550GT it says:
4.4-liter, 32-valve 445-hp V-8 engine with TwinPower Turbo technology, piezo direct fuel injection, 4 overhead camshafts, and Double-VANOS steplessly variable valve timing
I believe the key is the twinpower vs the two turbochargers. That should be easy enough to spot. However, I am still waiting on my car that was caught up in the Sandy delays.
There is a nice explanation on why the single turbo twin power is more efficient at:
The N63 and N63tu use single scroll turbos. The N63tu does NOT use twin scroll turbos, like the S63 and S63tu engines do.
2013 F10 550i M-Sport | Space Gray | ZMP | ZEC | 6-speed | Dinan Stage 3 Tune | Dinan Exhaust | ACS Springs | 35% Ceramic Tint
***On Order*** 2015 F80 M3 | Mineral Grey | M-DCT
Last edited by P-TownM3; 11-28-2012 at 08:14 AM.