EFI Question...

[MICROYS Robert]

     I own a 1995 Nissan 200SX SE-R.   It has a 2.0L SR20DE engine in it 
with an OBD-II ECU.  Nissan in its infinite wisdom has put a speed limiter 
in my car which shuts down my engine at an indicated 180km/hr.  The vehicle 
has a pulse generating vehicle speed sensor, which first goes to the gauge 
cluster and is then passed to the ECU (I haven't gotten the 'scope on the 
signal to the ECU yet to find out what it sees).  What I intend to do is 
design/create a device which sends a fixed (say 180km/hr) signal to the ECU 
after I exceed 180km/hr so that I may bypass this cursed functionality.

     My question is:  How does this effect the ignition and fuel delivery? 
 I know that the ECU uses the vehicle's speed in its calculation for these 
functions and I am wondering what effect passing an incorrect speed of 
180km/hr when I start to drive faster, say at 200km/hr (not that there 
really is any place that we can safely drive that fast, but a limiter on my 
car is really annoying...)

     On a side note, I have already created and installed my own AFR meter 
as documented on the DYI-EFI WWW pages.  I have also created a good resource 
for anybody interested in making their own AFR with refreneces to National 
Semi's Spec sheets, and all that other groovy stuff.  You might want to 
refrence it (I have documented my efforts through the project, and my page 
is aimed at helping novices)... http://www.magi.com/~rmicroys/afr.htm
 --
Rob Microys, rmicroys at shl.com, http://www.magi.com/~rmicroys/

The Motorsport Club of Ottawa:
http://www.magi.com/~rmicroys/mco/home.htm