MWP":3chcztql said:You don't care about knock protection? :shock:
As for fuel pressure control, it is useful on our cars with the stock smaller fuel return line (I control my pump speed with the ms3).
hoys":2hgyq44y said:The 165 has no variable pump speed control, just a vacuum modulator on the fuel pressure regulator to increase fuel pressure in effort to cool the engine down if it's overheating.
MWP":1o8e96na said:You don't care about knock protection? :shock:
As for fuel pressure control, it is useful on our cars with the stock smaller fuel return line (I control my pump speed with the ms3).
captaingowa":2h6hu0i0 said:hoys":2h6hu0i0 said:The 165 has no variable pump speed control, just a vacuum modulator on the fuel pressure regulator to increase fuel pressure in effort to cool the engine down if it's overheating.
It does have fuel pump voltage regulation..
It however, was not implemented to regulate fuel pressure rather conserve the life of the fuel pump.
Voltage regulation was based on Air Flow signal which in turn would signal the Fuel Pump Voltage Regulator to either high or low voltage..
Example:
your sitting in traffic... The pump would run at low voltage, thus conserving the life of the fuel pump.
Most people ditched it when modifying for performance since they did not want any chance of losing fuel pressure via the pump not getting full voltage signal when required.
hoys":27c2sn6y said:I thought the AFM circuit was just a pump kill, not a high or low speed switch.
captaingowa":36nxif5z said:hoys":36nxif5z said:I thought the AFM circuit was just a pump kill, not a high or low speed switch.
One of its functions does control the Circuit Opening Relay .. or as you say pump kill.
That Vane Air Flow meter or VAF was pretty much the corner stone to Toyota engineers and Engine Management.