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Old 01-03-2011, 05:06 PM   #2 (permalink)
COcyclist
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Join Date: Dec 2007
Location: NW Colo
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TDi - '04 VW Golf
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Quote:
Originally Posted by ted frater View Post
on adviceof a friend I blamked off the EGR valve in my programme of engine efficiency improvement. As anside that has certainly made a noticeable difference in fuel efficiency.

When off boost from the turbo, how much efficiency am i likely to lose with
a dirty fouled up inlet system?
Ive always thought that its important to keep the inlet system clean and smooth
to get the best cyl filling possible, especially on a diesel, where one is always looking for the max amount of clean cold air getting into the cylinders?
Any thoughts or advice welcome.
Ted
In Dorset
UK
We only get the VAG passenger diesels here in the states but from what I have read, the clogging is most noticeable when you are trying to flow a lot of air or make a lot of power. You may not be losing much efficiency at light or part throttle driving.

Do you have any data about your mileage gains without EGR? On the VW blocking off the EGR confuses the computer and many report decreased mileage.
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Quote:
Originally Posted by freebeard View Post
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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