Thread: boost bleed off
View Single Post
beepbeep beepbeep is offline
Registered User
 
beepbeep's Avatar
 
Join Date: Jun 2001
Location: Sweden
Posts: 5,565
What kind of exhaust? If wastegate has straight dump pipe and turbocharger restrictive damper, there will be some difference in boost produced.

Other from that, tapering boost is quite common for simple wastegate-regulated circuit w/o boost controller. It's more pronounced on turbochargers with internal wastegate though. Only way to keep boost at constant level is by fitting EBC or Dawe's device.

On the other hand, tapering boost isn't such a bad thing as it prevents turbo from overspining. VE is usually best around mid-range and air mass flow is moderate. As engine climbs up the revs VE starts to decrease and mass flows increase which "chokes" the engine and decreases the boost.
__________________
Thank you for your time,

Last edited by beepbeep; 12-17-2007 at 04:14 AM..
Old 12-17-2007, 01:39 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)