I've thought of steppers before... complexity, and heat aren't your friends.
Ray Ayala <[EMAIL PROTECTED]> wrote: Control would be much simpler all
around if the WG had an electric-powered actuator. The boost-powered version
requires compensation for continuously-changing boost pressure and it can't do
anything at all when boost is too low.
----- Original Message -----
From: Jason C
To: [email protected]
Sent: Monday, June 23, 2008 6:49 PM
Subject: turbos and fuel economy
I know some of you guys don't surf the miataforum so here.
This article shows the BSFC plots of an engine before and after turbo:
http://www.tc.gc.ca/programs/environment/climatechange/subgroups1/vehicle_technology/study2/Final_report/image/Final_30.gif
Here's the specific graph:
http://www.tc.gc.ca/programs/environment/climatechange/subgroups1/vehicle_technology/study2/Final_report/image/Final_30.gif
On a slightly different topic, the BMW 335i offers very good MPG for the
car's power and weight. One strategy they have is that the wastegate is
open during cruise. This would presumably reduce backpressure and thus
reduce "blowdown" losses during the exhaust stroke.
I've always advocated using a large-diameter, low-PSI wastegate can, and
using TPS-controlled EBC, for driveability. One downside is that tuning
boost control will be tricker.
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