[Vwdiesel] Why gasss cars mpg sucks (fwd)

[Shawn Wright]

On 14 May 2005 at 0:01, Libbybapa at wmconnect.com <Libbybapa at wmconnect.com> wrote:

> In a message dated 5/13/05 8:58:35 PM US Mountain Standard Time, 
> Libbybapa at wmconnect.com writes:
> 
> 
> > > how  do I know ? ----- I shut fuel solenoid off going down a big hill.
> > > 
> > 
> > How did the car respond?
> > Andrew
> 
> If it didn't respond poorly, wouldn't it be possible to cut the fuel any time
> the accelerator lever is in the idle position and the rpm's are above idle, to
> save fuel of course.  

I wonder if this is how it is done in the TDIs. It would seem to be a fairly simple thing 
to design, perhaps using the dynamic oil pressure circuit which triggers at 2000rpm, 
or just working off the tach signal. But I wonder if prolonged fuel cutoff at highway 
speeds could cause fuel starvation in the pump, ie: lack of lubrication? I don't know if 
the location of the solenoid poses a problem in this way or not...

Shawn Wright
http://zuiko.sls.bc.ca/~swright
'85 Jetta D 
'88 Westy 2.1L, soon to be 1.6TD 5 speed
 (see progress at http://members.shaw.ca/vwdiesels)
'82 Diesel Westy