Subject: RE:ignition timiming by CFI-EFI on 2008/2/1 2:03:24
Quote:
Please explain. (checking timing)because all I know is how to set base timing.My mistake ,I thought it would be like a non-efi when it come to checking total advance.
When you check the advance curve and total timing with a mechanical advance distributor, you disconnect the vacuum hose from the vacuum advance cannister and read the centrifugal advance. At WOT you have no vacuum so whatever the centrifugal advance does, is what you get. How are you disabling the "vacuum advance" with your computer controlled distributor? You can't. The TPS isn't sending a 100% throttle reading to the computer, the MAP isn't reading 0 (ambient) manifold pressure, the MAF isn't reading the air flow that WOT would produce at the same rpms. Unless you can read the chip, to see how it is programmed, the only way to check your WOT ignition timing curve is on the fly. A recording scanner might do it, but just hooked up, in the garage, it will only give you what you get with the timing light, which is meaningless.
