Question about BSFC on a fuel injected car.

[Carl Summers]

Hi Roger,
     I have seen some finely tuned Pro Stock engines in the high .3's at
~13:1 but I would have to venture that his .33 is coming from his 18:1
AFR....I'm thinking 18:1 is so lean it won't even damage the engine....I
have never heard of a self contained dyno that also tuned but doesn't mean
it doesn't exist,   curious as to how a guy on the F-body list would have
access to it :)  If it is a self tuning dyno then there probably is a
programmable desired AFR so he needs to set that at 12.5:1 and start leaning
from there in my opinion....ttyl
-Carl Summers



-----Original Message-----
From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
Behalf Of Roger Heflin
Sent: Thursday, April 27, 2000 1:51 PM
To: diy_efi at diy-efi.org
Subject: Question about BSFC on a fuel injected car.



Here is some background:
There is a person on the f-body fourth-gen list whose car is running
at a BSFC of .33 (calculated from the engine dynos lb-hr and
horsepower rating).

Can a fuel injected car run reasonably with that low of BSFC?

He did say he was getting A/F ratios (wide ratio O2's I am assuming)
that were high enough to make him nervious (18:1) at WOT.  He is going
to tune it more.

He also said that the engine dyno equipment was running the motor not
the computer from the car.   Is anyone familiar with this sort of
equipment?    He did say it was sequential injection and that the fuel
pump was part of the engine dyno setup.

			Roger

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