Date: March 10th 2010

At least you seem wise enough to have considered that you were coloring outside the lines. Some very creative and imaginative folks do not even recognize the lines, and that's where the danger lies. Congratulations on your ingenuity and perserverence! If you happen to have some objective data, such as a time slip from a drag strip, I'm sure the folks on this list would be even more impressed with your result!

I am curious to know how the speed of your supercharger is modulated, whether by a mechanical belt drive or an electrical signal.

Chuck Willis

-----Original Message-----
From: Murray Bruns [mailto:murraybruns@yahoo.com]
Sent: Wednesday, March 10, 2010 3:48 PM
To: Willis,Charles E
Subject: [Team3S] Re: Supercharging a NA DOHC


Pete,

I found in my queries back in October of 2009 most folks overwhelming favored turbos to the point that it impared their imagination and thought processes.  Had most folks not been so vehemently opposed to supercharging I may have not pursued it.  Because of this overwhelming prejudice towards supercharging I decided to make it my quest to prove those nay sayers wrong.  Besides, I wanted to do something different and create something unique,not just be another turbo owner.  Supercharing has been done for decades.  whether big hp applications or small.  I saw nothing impossible about this task so I decided to do it.  All it took was a "can do attitude" some imaginaion, and a little reseach.  Many TeamS3 folks need to try thinking "Outside the Box" where they will discover there is more than one way to skin a cat..

>>>Murray             



----- Original Message ----
From: "Rivenburg, Pete" <privenburg@firstam.com>;
To: murraybruns@yahoo.com
Sent: Wed, March 10, 2010 4:12:17 PM
Subject: [Team3S] Re: Supercharging a NA DOHC


Let us all know how it works out, this has been a hot button subject here over the years with a lot of heat & very little light for us NA drivers.
The consensus here has been that it's not worth the money, cheaper to buy a VR4.
Id like to see some different input since I own a 93 NA DOHC.
This group IS really technical though and a GREAT resource, without this list my NA would have gone south LONG ago.


Pete Rivenburg
Privenburg@firstam.com



-----Original Message-----
From: Murray Bruns [mailto:murraybruns@yahoo.com]
Sent: Wednesday, March 10, 2010 1:58 PM
To: Rivenburg, Pete
Subject: [Team3S] Re: Supercharging a NA DOHC


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