Question about BSFC on a fuel injected car.

[Seth]

Superflow 901-T dynos SORT OF control the engine. You can put in a load
program, set it a WOT and it will pause at every 250 or 500 or 1000 rpm
increment to get a number. Semi automatic, I guess. Great way to grenade
a motor if it's a long way out of tune and has a lot of boost.

-Seth

Carl Summers wrote:
> 
> 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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