Date:         Mon, 15 Jul 2002 18:55:13 -0400
Reply-To:     Christopher Berchin <ctb1@PEOPLEPC.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Christopher Berchin <ctb1@PEOPLEPC.COM>
Subject:      Re: tiico's, subies and diesels oh my...
Content-Type: text/plain; charset="iso-8859-1"

<< I'm just curious if there is a definitive place to look for
comparisons on these engine conversions? >>

I wouldn't call it "definitive," but I'm currently working on finishing a
spreadsheet with graphical analysis of the 2.2 Subie, 3.3 Subie, 1.9 and 2.1
WBX engines.  Basically I've plotted the thrust curves for each engine in
each gear over the entire rev range.  What I'm working on now is adding the
effects of powertrain losses (i.e. frictional losses that are internal) and
aero drag.  I have it figured out, I just haven't finished it yet.  Once
done, I can post the graphs - right now, the only thing that really "has it
all" is my comparison of the 2.1 WBX to the Subaru 2.2, but only for top
gear.  I have drag and powertrain loss effects only for fourth gear for
those engines - what's left to do is to do the rest of the gears and
engines.

The whole thing is an Excel spreadsheet, so you can play with tire sizes,
gear ratios, and dyno cuves to see what happens.  Note that all are
approximations, but so far my 1.9 WBX chart says that I should top out at
about 91 mph, and since the top speed is really 88 mph in reality, that's
close enough for gov't work.

If anybody wants the final results, drop me a line and I can send it along
to you.  Once I have something close to complete, I can upload the graphs at
my Imagestation albums.

To add more engines, all you would need is dyno data and gear ratios.  Punch
it in on the spreadsheet, do a little Excel work, and bammo - a new
comparison is born.

Chris