[Diy_efi] Jetronic

[ScottyGrover at aol.com]

In a message dated 2/27/06 7:10:37 P.M. Pacific Standard Time,  
davida1 at hiwaay.net writes:

Anyone remember the old D-Jet system?  It was the grandfather of  our
modern speed-density systems.  Had a fascinating magnetic /  mechanical
pressure transducer for measuring density; and sets (yes- setS)  of breaker
points (early version) for the speed sensor! Electronic  ignition, but points
for the EFI... Leave it to Bosch!    The  throttle switch would pulse on and
off as the throttle moved open and  create extra injector pulses for
pumpshot.   The ECU was fully  analog.  There ARE people who re-map these
units by changing  resistors, etc.



I had one of those taken from a VW squareback. No electronic  ignition.  The 
points cam was mounted on the distributor shaft--a  special Housing with the 
points was mounted on the side of the  distributor.  I added two power 
resistors and two power transistors to the  case and mounted the whole thing in a 
Corvair--used everything else stock as  Bosch built it--worked just fine until I 
had an engine fire and destroyed the  works.  If I were to rework the thing for 
use now, I'd adapt a Hall-effect  sensor to the harmonic balancer for timing 
and get rid of those points.  
What I'd like to know is--were any of the digital Jetronics using the  
flap-type MAF sersor like the analog Jetronics-say the one in a Datsun Z280? And  if 
so was it linear or logarithmic?
 
Scotty
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