View Single Post
Old 02-02-2009, 03:33 PM
dakarm dakarm is offline
Officially Welcomed to the 'Fest
Location: Danville, CA
Join Date: Apr 2002
Posts: 519
Send a message via AIM to dakarm
Mein Auto: 00 M Coupe, 08 MCS JCW S1
Originally Posted by DaShoker View Post
What does DISA do anyway?
found this in my search:

To be exact, the DISA valve does not change the length of the intake system on the six-cylinder engines from the M52TU onwards - its function is to be open at low speeds, so feeding all six intake pipes together.

At mid-range speeds it closes, seperating the front and rear groups of three cylinders from each other. At higher speeds it opens again, joining the cylinder groups together. It therefore acts like a massive balance pipe which can be closed when required.

The effect of this is to give more mid-range torque without interfering with bottpm and top-end torque.
member of CRS Club
'00 Dakar Duck CRS Edition
'10 335d
'12 X5d
'12 MINI Countryman S
Reply With Quote