[urq] air fuel gauges and other special electronic gizmos

[packley]

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.

Phil