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SilverGhost
Forums Junkie

Location:
Sydney
Registered:
September 2004

Re: 18R_GU vacum advance

Wed, 22 December 2004 07:46

allencr wrote on Tue, 21 December 2004 02:17

the vacuum advance really retards the ignition timing when accelerating. lower vacuum = less advance.
opening the throttle lowers the vacuum until the rpm's catch up, and only then it will be advancing any more then it does at idle.
WOT = almost no vacuum advance.
down shifting/engine braking gets the most advance out of it, but it's useless for the engine at that time.

accelerator pump??????
static timing & mechanical advance.

I think you have it the wrong way around. Why would you want to retard timing on acceleration??

less vacuum on the unit allows it to spring back to a more advanced state then when your off the throttle the increased vacuum works on the actuator to retard timing.

This is going off a Nissan CA20E with a vacuum advance module...IMO they should call it a vacuum retard module Razz

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