My guess is the electronic engine management on your TDI is
compensating for the lower BTU's in the B100, whereas the older cars
with mechanical systems cannot do that dynamically. I have heard
that you can gain back some performance/economy from an older vehicle
by advancing the injection timing a degree or two.
Regards,
J.B.
At 01:34 PM 8/30/2005, you wrote:
We run B100 in our '03 TDI and B50 in our '82 240D.
Our results are basically the same as yours, but I
think we've had low to no drop (0 to 10%) in mileage
on B100 in the late model TDI; anecdotally, the older
the engine (or design thereof), the bigger the drop in
mpg going to biodiesel - any hypotheses, folks?
DG
--- "J.B. Hebert" <[EMAIL PROTECTED]> wrote:
> I have run about 100 gallons of B100 through my '95
> E300D (doesn't
> take long for me) and was looking to compare numbers
> with others on
> the list who are running B100. I gathered a fair
> amount of
> performance and economy data before and after the
> switch and was a
> little surprised by the outcome. Every source I've
> read on biodiesel
> indicates that you should expect a slight decrease
> in power and
> economy because there is slightly less energy in
> biodiesel. Well, I
> have noticed no significant drop in performance as
> indicated by the
> stopwatch. The butt dyno tells me that I'm a little
> down, but
> barely. So, I was expecting about a 5% drop in
> power, and I would
> guess that I am seeing less that 2%. What I have
> noticed, however,
> is that my economy is down a little over 15%, from
> around 29.9 MPG to
> 25.3 MPG. To make sure it wasn't the car, I ran a
> few tanks of dino
> fuel through and it again returned to around 29.9
> MPG.
>
> Is anyone else out there running B100 who is as anal
> as I am and
> documented the changes? I'd love to compare notes.
>
> Thanks,
>
>
> J.B. Hebert
>
> ----------------------------------------------
> Current Vehicles:
>
> '76 Ford Bronco
> '78 Volvo 262C Bertone V8
> '80 Alpina B7 Turbo Coupe
> '82 Mercedes 300CD (Deceased)
> '93 GMC Sierra 2500
> '95 Mercedes E300D
>
>
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