Date:         Fri, 5 Jul 2002 19:30:30 -0400
Reply-To:     Christopher Berchin <ctb1@PEOPLEPC.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Christopher Berchin <ctb1@PEOPLEPC.COM>
Subject:      Thrust/Accel curves of 2.1 WBX v. Subaru 2.2
Content-Type: text/plain; charset="iso-8859-1"

Hi all.  Using the info previous supplied by Warren Chapman at his website
(http://www.pbase.com/warren8/subaru_vanagon_conversionhttp://www.pbase.com/
warren8/subaru_vanagon_conversion), I plotted the thrust curves of the WBX
v. 2.2 Subaru.  These curves were plotted for a standard 4-speed gearbox,
205/65-15 tires, and 3500lb vehicle weight.  What you will see is the
acceleration (in g's) in each gear throughout the rev range, based on the
torque curves of each engine.  Any gearing change, tire size change,
horsepower change, weight, etc., will affect this.

What I found particularly interesting is how this graphically shows the
extra range you get with an engine that pulls more than 5300 rpm.  Note how
you can be in 3rd gear at anything up to 80 mph in the Subie, aiding in
climbing those hills.  Also, for around-town punch, note the huge difference
in acceleration right after the WBX shifts to 2nd gear - the Subaru is
accelerating at 0.7g, while the WBX drops to about 0.31g at the same speed.

The graphs can be found at

http://www.imagestation.com/album/pictures.html?id=4291653823

Enjoy.  Please don't flame me, btw.  I'm just doing some hopefully
interesting analysis.  If anyone wants the spreadsheet (written by a friend
of mine - I always give him credit since I didn't write the software, I just
use it) to input your own dyno curves and gear ratios, let me know and I can
mail it out to you.  I've used it to consider gear changes on some of my
cars, analyze the effects of weight on accel, etc.

Chris