Diesel motor wanted/Diesel bus

[drew at scirocco.cs.uoguelph.ca (Drew)]

On Mon, 2004-05-17 at 11:02, Eric S wrote:

> Woah Drew...no!  The eco-diesel was a special 1.6TD that utilized a cat
> and had the boost aneriod removed.  It used a smaller turbo, and was rated
> at 68HP (though I've found that turbos spool characteristics to make it a
> much more fun engine to drive than the standard 1.6TD)

Uh, NO, Eric - there WAS a 1.6TD ECO diesel on the US market (we were
spared this abomination north of the border,) but the 1.9TD AAZ motor
was ALSO called an ECO diesel.  This engine has fuel delivery and timing
maps to minimize soot and NOX output.  It is a non-EGR engine with a
one-way catalyst (same as the 1.6 ECO and TDIs)  The engine came in B3
Passat and A3 platform cars in Canada.

And the 1.6 ECOdiesel would ONLY be fun to drive because of the 4.25
final drive.  This engine was coupled with short gear ratios to keep
particulate emissions low.  Its torque numbers were more in line with a
normally aspirated diesel (75-80 lb-ft range) do to the lack of fuelling
on boost.

> Many dynos have proven that the numbers VW quoted for the stock TDI were
> silly low.  I've seen multiple dynos showing 100 hp and 185+ ft lbs *to
> the wheels* from stock TDIs.

The TDI's (like any diesel) power output varies greatly depending on
factors such as ambient air temperature, and fuel temperature and cetane
rating.  The EDC (elctronic diesel control) computer's job is to monitor
these and other parameters (the key ones being air mass at the MAF and
intake manifold pressure) and adjust fuel timing and volume to minimize
emissions and maximize power output.  Because of this, a stock TDI (or
any other diesel) will perform much better at sea level on a cool day
than it will on a hot day at 7500 feet.

Drew

84 Wolfsburg Ed. Scirocco GTD http://scirocco.cs.uoguelph.ca/gtd 
89 Audi 200 Turbo Quattro Avant 
94 A3 Golf GL TurboDiesel, 99 A3 Jetta GL TDI 
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