[s-cars] E85 fuel

[Jim Green]

On 4/15/06, Joern Amundsen <joeamund at online.no> wrote:
>
> http://www.gatebil.no/index.php?objectid=459&pageid=153&offset=10
>
> E 85 Pros:
> 1) Exhaust temp is significant lower, approx 60-80 Degr C in favour of E85
> to race gas on full load
>
> 2) Power is up 10-15% with use of E85 due to more oxygen molecules, (its
> like getting a new turbo with slightly increased airflow)
>
> 3) Price pr liter is around 1 USD/liter compared to 6 USD/liter in Norway
>
> 4) High resistance against knocking, at 2 barg boost with race gas we were
> limited to 20 degrees ign advance, with E85 we advanced to 40 + degrees with
> no signs of knocking(Dyno shop used a special electronic sensor with head
> phones)
>
> 5) No material problems observed due to alcohol mix, I were running Russel
> hoses and couplings, two Bosch 044 fuel pumps aluminium fuel rail etc
>
>
> Cons:
>
> 1) Approx 30 % more fuel required pr horsepower, which sets high demand on
> the fuel system.
>
> 2) Unable to start engine with temperatures below 4-8 degrees celcius due
> to low atomization.
>
> 3) Normal Motronic with 5 Beru coils ala AAN or ADU will give misfires at
> 1,3-1,4 barg boost
>
> 4) Ignition system is real expencive in order to run high boost
>
> Thanks for the info Joern.  That's very interesting what you've found on
the timing values.  Do you have any experience with the factory modules that
detect the percentage of ethanol in the fuel on the flex fuel cars?  If it
was a simple linear 0-5v output it would be very easy to intall one of these
sensors with a standalone ECU that adds timing and fuel as the ethanol
content goes up.

It's actually illegal to retrofit cars to E85 here unless done by an
approved shop, but that's not going to stop me from playing with it at some
point.  Especially since there's a pump only two miles from me.

Ohh yea, nice project!

--
Jim Green
'89 90 GT35R quattro
'89 80q
http://www.mswanson.com/~jgreen/car_home.html