Cosmo,
Another place to look for info about tuning with a wide-band oxygen sensor is
on the Innovate Motorsports website. They have a forum there as well. I did
post some pictures of my plugs on my TR4A in order to get some comments.
The days of expecting to see a nice caramel color on the plugs are gone, at
least in the US. The color came primarily from lead deposits. Now, the
insulator should be pretty clean. My pix are in this link:
http://www.innovatemotorsports.com/forums/showthread.php?t=6007
I have found that the wideband oxygen sensor is very helpful, but since it ONLY
measures the residual oxygen, then if you have an exhaust leak (allowing air
INTO the exhaust) or a misfire, you can have confusing readings. But with a
reasonably well running engine, it will definitely help to dial-in the mixture
over the full performance range.
There are a variety of different interfaces that Innvoate sells, some of them
offer datalogging. I got one of these. It logs the AFR, RPM, and I also
record MAP. I had been logging piston lift in the carburetor so I can
determine what part of the needle is active at any particular time, but I have
devised a mathematical formula using RPM and MAP to predict the position rather
than directly measure the lift. It seems to work well, but the calibration
numbers probably only apply to a single car, but other similar engines with the
similar intake manifolds and carbs would be pretty close, I think. I even used
these numbers as an initial guestimate as I started tuning my TR7, and the
position numbers seem reasonable.
Which other forum is diuscussing oxygen sensors?
-Tony
--------------Original Message-----------------
Date: Sun, 6 May 2007 07:14:33 -0700 (PDT)
From: Cosmo Kramer <tr4a2712@yahoo.com>
Subject: [TR] Brownish spark plugs & Classic Motorsports
Hi List!
A follow up to my thread: 'Adj. Su's leaner'. I've finialy been able to adj.
the Su's to a leanest to the point of NOT having my spark plugs black.
Yesterday, I removed the plugs to find them a brownish colour & installed new
ones. I haven't had a chance to drive the Garage Queen yet. to see what colour
the plugs will be. I'm counting on them being a lightish brown colour, but
really won't know until I drive & pull the plugs for inspection.
The other reason for this post is to thank everyone who replied to my request
of having an artical in Classic Motorsports. I'm having a list member sending
me
the artical for me to read. I also had a person infom me about the 'British
Form' that is running a discution on Oxgent sensoring testing.
- -Cosmo Kramer
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