[Gmecm] Jetronic

[nhromyak at comcast.net]

Peak and Hold computer?  Can it drive four TBI injectors?  Better still, is there a mask for this computer around?  

If the above is yes, if you have the computer number, I would be interested in finding one.  :)

Thanks.
Nick

-------------- Original message -------------- 
From: bcroe at juno.com 

> That system is only somewhat different than the 76-79 
> Cadillac injection system. Analog computer and all, 
> but they did replace the points with reed switches. The 
> switches work fine, but sometimes the magnets come 
> off the HEI shaft. 
> 
> My 79 Eldo and many other Cadillacs are using this 
> system today. I do some repairs on the ECUs for owners 
> around the world. Peak and hold port injection, ahead 
> of its time. Now they use "learning" ECUs and feedback 
> to compensate for the poorer accuracy of saturated 
> injectors. At my house, I'm trying to marry a modern 
> sequential injection, closed loop ECU to the original 
> fuel handling components on Olds 350/403, and Cad 
> 425/472/500. I have an ACCEL VII working. 
> 
> Bruce Roe 
> 
> 
> 27 Feb 2006 "David Allen" 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 saw one of these on an older Mercedes V8. It was an early 70's 
> > model 
> > IIRC. I'm not the type to scrap a unique system like this if there 
> > is any 
> > hope. I would try to repair if feasible, but if not, it would sure 
> > be 
> > tempting to install a Delco 1226869 (or similar). The distributor 
> > had a VR 
> > pickup directly compatible with an HEI ignition module. You could 
> > hull out 
> > the transducer, and there might be enough room inside to "hide" a 
> > modern 
> > Delco MAP sensor. The injector impenence would be an unknown, as 
> > would be 
> > mounting the TPS. After taking the time to develop a good 
> > calibration; 
> > you'd have quite a system. It would appear to be original, but with 
> > the 
> > advantage of fully mapped fuel and ignition. 
> > Fun to think about anyway! 
> > David 
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