[DML] Re: Retrofitting Throttle Enrichment Circuit

["endotex23" <endotex23@xxxxxxxxx>]

--- In dmcnews@xxxxxxxxxxxxxxx, "Rick" <rdevaux@xxxx> wrote:
> 
> 
> I'm looking to retrofit a throttle enrichment circuit onto my PRV.  
> Does anyone have a schematic of the components and connections?  
> Thanks

Sorry Rick, I missed this. Plus I've been out of town. This could be
useful to Jim Reeves too, whose post I also missed until now.

Pulling pin 11 (currently unused) low on the stock lambda controller 
will set a fixed FV cycle for nearly maximum enrichment. It can be
further combined with the WOT input (the pin current number currently
escapes me at the moment) to gain even more. You can easily use this
pin for accel enrichment via a differential pressure switch measuring
intake tract vacuum and venting through a calibrated orifice. Volvo
later went this route and it beats using the CPR any day. With a bit
more hardware you can also do electronic warm up enrichment and the
CPR can be removed.

For accel enrichment it works well but note using it will result in
surpressing the lambda loop and result in a fixed output. If you want
to use it for closed loop or warm up you'll need a seperate control
element for PWM, then you can control lambda at any point you desire
as long as you have a wide band O2S. If you go that far you might as
well use the controller to do all three functions. Contact me if you
need part numbers or more help.

G








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