On 30 March 2012 16:55, Sean Breheny <shb7@cornell.edu> wrote:

> I am curious here: where would all the extra energy be going? is the
>

My assumption was that the engine needs to push the exhausting gas through
this filter and that takes quite a few horse power out, so removing that
DPF you have more energy left for driving the car itself. But again, this
was only my speculation.

Tamas




> backpressure causing incomplete burning and fuel is being lost without
> all the energy being extracted from it, or is the engine becoming much
> less efficient and all the extra energy is going into heat somewhere?
> If it is the latter, it seems likely that something would have
> overheated. I suppose that maybe the cooling system could handle it
> but it certainly would be a big increase in waste heat.
>
> On Fri, Mar 30, 2012 at 11:17 AM, Bob Blick <bobblick@ftml.net> wrote:
> > On Fri, Mar 30, 2012, at 11:30 AM, Tamas Rudnai wrote:
> >> However, after removing the
> >> filter I have noticed that the fuel consumption is much better, it is =
61
> >> mpg (Imperial, or 51 us mpg, or 4.5 l/100km). Previously (with the DPF
> >> still in) this figure was way worse, maybe I could achieve 40 mpg (33 =
us
> >> mpg), which is not entirely surprising as the filter is basically a
> >> blockage in the exhausting pipe system -- causing the engine work hard=
er
> >> to
> >> push the exhausting gas through that.
> >
> > It's broken. When it's functioning properly it does not block the
> > exhaust. Most exhaust systems are well-designed and you should not have
> > an increase in fuel economy by removing a component. Do you have a
> > warranty? Emissions-related parts have a 70,000 (or something equally
> > large) mile warranty here. The on-board diagnostics should have alerted
> > you with a "check engine" light a long time ago.
> >
> > Bob
> >
> > --
> > http://www.fastmail.fm - Does exactly what it says on the tin
> >
> > --
> > http://www.piclist.com PIC/SX FAQ & list archive
> > View/change your membership options at
> > http://mailman.mit.edu/mailman/listinfo/piclist
> --
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>



--=20
int main() { char *a,*s,*q; printf(s=3D"int main() { char *a,*s,*q;
printf(s=3D%s%s%s, q=3D%s%s%s%s,s,q,q,a=3D%s%s%s%s,q,q,q,a,a,q); }",
q=3D"\"",s,q,q,a=3D"\\",q,q,q,a,a,q); }
--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.