Date: March 10th 2010

Thanks Pete,
 
FMU and ECU will be adjusted accordingly.

>>>Murray 



----- Original Message ----
From: "Rivenburg, Pete" <privenburg@firstam.com>;
To: murraybruns@yahoo.com
Sent: Wed, March 10, 2010 3:41:23 PM
Subject: [Team3S] Re: Supercharging a NA DOHC


When you put the new headers on Murray,
You should get it made with bungs for EGT sensors (Exhaust Gas Temperature) on both sides, get the EGT setup with built in ignition cutoff. You CANT go wrong that way & fry your engine. $300 to protect $6000.
Headers tend to lean out fuel mix.
EGT sensors don't care WHY it went lean (too hot) they just shut it down right now before the damage is done.
Tweak A/F & run again.


Pete Rivenburg
Privenburg@firstam.com


-----Original Message-----
From: Murray Bruns [mailto:murraybruns@yahoo.com]
Sent: Wednesday, March 10, 2010 1:17 PM
To: Rivenburg, Pete
Subject: [Team3S] Re: Supercharging a NA DOHC


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