[Diy_efi] GM TBI for 1.8 to 2 liter engines

[Torbjörn Forsman]

In Europe, the GM TBI system (P4) is widely used on Opel cars with 1,6 l 
engines (C16LZ and C16NZ), around 1986 to 1992. I think that the same 
cars may have been sold as Daewoo or Chevrolet in the US. I have 
relatively successfully used a such system on a 2,0 l Volvo B20 engine,
it is necessary to increase the fuel pressure to compensate for the 
bigger engine, this was done by a separate, adjustable pressure 
regulator connected into the fuel return line.
It was somewhat tricky to modify the ignition distributor (Bosch with 
breaker points) to get an inductive sensor into it and remove the 
mechanical ignition advance. The main problem was that the distributor 
rotates counterclockwise, and it was difficult to find a CCW Bosch 
distributor with inductive sensor. After some searching, i found that i 
could use parts from on a '86 Ford Escort (german built) with 1,6 l 
engine. When modifying the distributor, one must be very careful to get 
both the sensor rotor and the distributor rotor in the correct height, 
as well as making sure that the trigger pulse is correctly synchronized 
to the high voltage distributor.

/Torbjörn Forsman

Dan Sawyer wrote:
> All,
> 
> I am planning an MGB conversion to a GM TBI system.
> 
> Does anyone have any experience with 1.8 to 2 liter conversions? What 
> were the GM vehicles and years? Did they use the same ECM as the 4.3l 
> V6? What were the TBI models?
> 
> The MG is a side draft intake manifold. Will the TBI work in a 
> horizontal configuration?
> 
> Thanks,
> Dan
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