View Single Post
      09-25-2013, 12:41 PM   #2
Savory
Kaskasero
Savory's Avatar
54
Rep
345
Posts

Drives: You Insane
Join Date: Sep 2013
Location: Azusa, Ca

iTrader: (0)

Quote:
Originally Posted by BRAISKI View Post
Ok now that the new M3/M4 will have a "bi turbo".

What exactly is the difference? Is there a difference, since technically bi=two so 2=twin.

Is one turbo for a first range of RPM and second is the the next range of RPM. This would be interesting comparison since BMW now has a car with a Twin Turbo (N54) and a car thats called Bi Turbo (S55).

Tried searching around Google but nothing no satisfactory answer everyone seems to have some different opinions.
Same thing. Bi=two. What you are thinking of is a sequential twin twin turbo system in which one turbocharger (smaller of the two) is specified for a lower set of RPMs to provide fast boost/response, then an actuator let's the second pre loaded turbo spool for the higher RPM range. At least that's how I remember it working. M4 appears to use a parallel twin turbo setup (two of the same turbos)
__________________
Rides:
BSM E53 X5 3.0i | Mods: 4.8is Style 168 wheels
1996 MB C280 Sport
2001 E39 M5
Appreciate 0