[urq] .Ur Q meets 4000Q board computer

[Tony Lum]

At 08:58 PM 1/15/2006, Andrew Finney wrote:
>Is it possible to adapt a 4000Q computer to work correctly with a 1985 Ur
>Quattro. Assuming the inputs were there.... like an MC fuel distributer with
>MPG output..... is there enough range in the MPG and range settings to get
>the thing to work? Thanks.
>
>Andrew Finney
>1985 and 1983 UrQs.
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Like Steve says, you would need an MC mass airflow sensor to get the pot 
input for the computer.  But something more important would be 
missing.  The 4kq actually has a modified ecu (I think its a xxx xxx 264 D) 
to help run the display.  The D ecu outputs a signal (pin 23) that I call 
enrichment or scaling level to the trip computer.  Without this signal the 
trip computer is way off.  I ran into this when I converted my '85 4kq to 
trip computer.  You would need some sort of digital mapper that used the 
pot as input and that could get pretty complicated to be accurate.

A digidash from a 87.5 CGT would be a better bet.  It doesn't need the pot 
at all.  Just uses fuel level and speed to make its calculations.  It would 
be correct for a Euro urq if you can "adjust" to the way the digi-dash 
works.  There are a few parts missing that correct for the urq's bigger (90 
vs. 70 liter) tank.  I believe Steve Eiche has the info on that.

HTH,
Tony
'83 urq #302