is this considered a twin-turbo system? i had always kind of figured that normal tt's are used simultaneously, rather than to provide boost at different ranges. if somebody can correct or inform me i'd appreciate it.
(yes, i'm aware that bmw has long had turbos installed on diesel motors.)
No, I think that TT's are not used simultaneously. I think that the Supra TT (i know its not a BMW) used each turbo for different ranges throughout the RPMs. One was for low RPMs and the other was for higher RPMs.
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97 Jet Black 318ti Sport. Not so stock anymore!.... Now Featuring:318ti.org sticker Now featuring: Hartge exhaust|Blacked out Grilles|Front Clear Corners or Ambers depending on how I feel|325is vented front brakes|Bilstein Sports|H&R Sports|E46 RSMs w/ Z3 reinforcment plates|16" Style 45s|17" E46 M68 rims|18" Authentic Hartge Classics C|OEM M135 ZHP wheels and 99 Titan Silver 323is Dinan S1+few more mods Coming sometime in the future:...SCed 2.1...new (to me) car mod maybe?...all in one car
only 76+ hp from a tt system. kinda wierd, when not jsut get the new m3 engine? but then turbo kicks ass and will probably be able to mod alot more hp out of it...
Interesting. As far as the twin turbos are concerned, they can be sequintial (different sizes for different RPMS) like on the 3rd gen RX7 and Supras, or one turbo used for each bank of cylinders like on the 30ZXTT
bmw to start adding turbos 
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