Author Topic: Injector opening pressures..  (Read 5379 times)

Reply #15September 06, 2009, 09:15:47 pm

Rabbit TD

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Re: Injector opening pressures..
« Reply #15 on: September 06, 2009, 09:15:47 pm »
my car started BETTER with the lift pump. i noticed more power at the far end of my pedal, but thats it, it doesnt idle higher or anything. i dont see how a lift pump would make it idle faster... cause there is more than 4-7 psi inside the pump even at idle.
I wouldn't think it should make any difference at idle either but it is deffinately a little smoother and faster now idling.  Like I said, I haven't chcked to see if the plugs are actualy glowing but I suspect they are and there is power to the bus bar.  One thing I noticed this afternoon when I started it when it was warm outside was that it actualy idled slower with the advance lever pulled out and a little rougher, just backwards from the way it was before the pump was put on.  I think this thing is really messing with the timing especialy at low speed.  Next time it's cold I'm gonna pull the inline fuse and see if it makes any diference.  If it does then I think I'll put on a spring loaded toggle switch to the pump or just take the damn thing off altogether ::)

Reply #16September 07, 2009, 08:08:57 am

Rabbit on Roids

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Re: Injector opening pressures..
« Reply #16 on: September 07, 2009, 08:08:57 am »
the problem is not from the lift pump. it just supplies the vane pump with a pressurized source, rather than a suction source.
i think that the vane pump then pumps up the pressure to 30-40 psi inside the pump just at idle. the internal pressure stays the same, unless you are feeding it with a VW CIS fuel pump, those things make like 90 psi.  :o