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Old 11-28-2012, 08:13 AM
P-TownM3 P-TownM3 is offline
Silverstone F80 M3
Location: Pleasanton, CA
 
Join Date: Apr 2010
Posts: 176
Mein Auto: '15 F80 M3
Quote:
Originally Posted by agraham2252 View Post
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:

http://www.popsci.com/content/two-one-turbocharger

The N63 and N63tu use single scroll turbos. The N63tu does NOT use twin scroll turbos, like the S63 and S63tu engines do.

http://www.bimmerboost.com/content.p...and-S63-motors

Last edited by P-TownM3; 11-28-2012 at 08:14 AM.
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