Date: March 10th 2010

Matt,

I have research fuel ratios to great length for supercharged applications such as mine and according to the engineers I'm in the sweet spot for a non racing application.  Maybe for turbos running under a racing condition 8;1 is correct I don't know but from what I've read in the last few hours 8:1 is extremetly rich.

My motor pulls very very hard, doesn't miss a beat, no black smoke, no unusual engine temps.  I'm totally satisfied that A/Fs are correct for my usage.

BTW - running 6 pounds of  boost on a 10:1 compression ratio engine  has an effective boost rate of 10 pounds of boost on a 8:1 engine like that found on a VR4 

Appreciate your input.

>>>Murray
94 3000GT SL Supercharged       



----- Original Message ----
From: Matt Jannusch <mjannusch@gmail.com>;
To: murraybruns@yahoo.com
Sent: Wed, March 10, 2010 2:32:42 PM
Subject: [Team3S] Re: Supercharging a NA DOHC


> If stoich is considered a f/a ratio of 12.5 and 14.5,  I would say that under
> acceleration I run around little less than 12 and cruise a little below 14.
> Obviously the A/F is changing constantly but I would say those numbers
> are fairly representative.

The definition of stoichiometric for gasoline is 14.7:1.  You should
be around there during light load cruise, and around 11.5-11.8:1 while
under heavy load (boost).

-Matt
'95 3000GT Spyder VR4
'93 3000GT VR4