Ferrari Mailing List: Re: NGK Powerdex AFX Wideband O2 Air Fuel Ratio Monitor

[Jeff Greenfield (coyote]

No experience with the NGK unit.

I have used some of the stuff from these guys (LM-1 and related stuff) with
good results. In the last few years they've come out with many new products.

http://www.innovatemotorsports.com/products.php

Whatever you use, you want to make sure that the controller has a
'conventional' output. IOW, you install the wide band sensor in the existing
holes in your exhaust replacing the conventional o2 sensor. You then run the
output from the controller to the cars ecu.

However, when you are tuning the engine, you want to do it in open loop with
the cars ecu disconnected from the oxygen sensor(s) otherwise you will not
get accurate results.

Once you get the AFR where you want it (which should be close to 14:1 during
part throttle cruise, and about 12.5:1 during WOT) you then reconnect the
oxygen sensor so that the ecu can help fine tune it within the range.

If you are too far out of range, the system won't be able to compensate.
There is no reason to leave the ecu disconnected from the sensors, this will
only hurt performance and fuel economy. 

Regardless of what mods have been done, tuning for performance, etc., and
internal combustion engine will still run best and make the most power at
close to an ideal AFR which is 14:1, which is exactly what the oxygen sensor
is designed to do.

Jeff



-----Original Message-----
From: Martin Stark [mailto:MStark [at] Copper.net] 
Sent: Friday, April 06, 2007 12:35 PM
To: Jeff Greenfield
Cc: The FerrariList
Subject: [Ferrari] NGK Powerdex AFX Wideband O2 Air Fuel Ratio Monitor

I've been making small adjustments to my TR's fuel distributors' mixture 
settings and then reading the spark plugs to see if the banks are 
running at about the same A/F ratio.  In an effort the make the process 
more quantitative, I'm considering buying a pair of the NGK A/F ratio 
monitors and wonder if anyone on the list has had experience with them.
http://www.ngksparkplugs.com/products/air-fuel/index.asp?nav=19000&country=U
S
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