Question about BSFC on a fuel injected car.

[Greg Hermann]

>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?

1. What's his compression ratio? --higher will give lower BSFC.

2. Is he using coatings (piston crowns, chambers, valve heads)--this will
help lower it.

3. He must be running a pretty mild cam.

4. Must be getting awfully good fuel atomization (higher than usual fuel
pressure?)

5. Must have REALLY nice chamber shape/piston crown design AND really tight
squish clearance.

6 18: 1 a/f would be OK for cruising type loads IF it was lighting and
burning smoothly.

7. At WOT, he would be getting a whole lot more power if he richened it
down to about 13 : 1!!

BUT--the first thing I would check carefully would be the calibration of
his dyno equipment!! (Maybe it reads in California HP!

It would take a _LOT_ of skill, and a bit of luck, to get the BSFC down
this low!

Greg
>
>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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