[urq] air fuel gauges and other special electronic gizmos

[Charles Baer]

The LM has been a topic for some 930 (CIS turbo) guys on the PP BBS in 
the last few months,
here's two threads with some experiences that got me thinking about 
getting one:

http://forums.pelicanparts.com/showthread.php?s=5c1cc23a0d8e99bde0f040778c34cc87&threadid=152519&highlight=wideband+AND+LM1

http://forums.pelicanparts.com/showthread.php?s=5c1cc23a0d8e99bde0f040778c34cc87&threadid=165439&highlight=wideband+AND+LM1

Wayne sells the base kit (LM + sensor) for $339, I don't know if that's 
a deal or not.

Charlie

packley wrote:

>I have been gaining experience with computer controls
>with my A4 1.8T race car, where airfuel ratio is critical.
>
>I have Split Second AFR gauges in cars that have been seriously
>modified (930,S6, and A4) and find that the narrow band old technology
>is nice, and the lights show me general AFR, but the new technology
>is now the wide band units that are much more accurate, and data
>logging.
>
>These used to be quite expensive, and the 5 wire oxy sensors very
>costly.
>Now the sensors are under $100 and the gauges are under $400 instead of
>the
>$000's several years ago.
>
>We are trying out this LM-1 unit that gives real time AFR numbers on a
>digital screen that can be downloaded with a laptop.  We are also
>installing a new splitsecond piggyback controller that will enable us
>to reprogram timing and afr throughout the rev range.  We are doing mods
>on the A4, different turbo, front mount intercooler, larger
>injectors, special software, and other stuff and have too rich a mixture
>that we are having difficulty getting customized programming through
>Garrett
>(GIAC) so now we can do it ourselves, essentially.  We are approximately
>(confirmed by dyno) about 250 wheel hp with the A4 but with several
>problems 
>we have corrected.  The older Greddy profec boost controller was unable
>to
>hold 22 psi boost pressure at high rpm, and would bleed off through
>integral
>wastegate as the solenoids were incapable of producing enough vacuum to
>hold
>the diaphragm shut. A new Profec B series II corrected that problem.
>Too
>much information on a non-3B engine, so will end here.
>
>We also have an adjustable fuel pressure regulator on the car, similar
>to the one you can buy from ECS.
>
>Essentially a dyno in a box.  The LM-1 can be shifted from car to car,
>after each car has a special oxy sensor installed, and is prewired to
>plug the unit in.
>
>Several tests using this system will easily pay for itself vs. dyno
>time.
>
>http://www.innovatemotorsports.com/
>
>
>We will be using this same system on our urq with modified AAN engine
>to get the proper ratios from the K26/27 turbo and SQ manifold working
>with the RS2 hardware.  This process will be a fast learning curve.
>
>The piggyback controller from Split Second
>Split Second
>1949 East Deere Ave. Santa Ana, CA 92705
>TEL: (949) 863-1359 FAX: (949) 863-1363
>
>can be found here:
>http://www.splitsec.com/
>
>I mention all this, as the new wide band technology is really worth
>investigating, the narrowband is just not very useful in comparison.
>  
>