Do you run or race with a mechanical or vacuum advance? Race on the weekends get groceries on Monday?? Dyno numbers are not the end all peak of performance if 'performing' is based on the ability to get the vehicle moving in sub zero weather, have it idle at 210F with the A/C on, lug a load up a hill with a 6000 foot elevation change...and still run close to what it did at sea level. Knock sensors? The ability to pull back the timing on the fly when the sensor detects knocking or when you have to use a different grade fuel on the road. How about hop out rate on your advance. Need it all in faster, need to add more at top end? Flexibility is built it without spring or advance pot changes. Interesting that you wont change your advance curve from the street to the strip. Is one advance curve ideal for both? Buying an EFI system will adapt to a wide variety of motors, street or strip. Without setting up your curve to your specific motor (and possibly to its function that night) on a distributor machine, I think your leaving performance on the table, either in ET's or driveabilty, opposite ends of the spectrum. Here is a quote from someone obviously more educated on the matter than me, "...Vacuum advance calibrations are different between stock engines and modified engines, especially if you have a lot of cam and have relatively low manifold vacuum at idle. Most stock vacuum advance cans aren’t fully-deployed until they see about 15” Hg. Manifold vacuum, so those cans don’t work very well on a modified engine; with less than 15” Hg. at a rough idle, the stock can will “dither” in and out in response to the rapidly-changing manifold vacuum, constantly varying the amount of vacuum advance, which creates an unstable idle. Modified engines with more cam that generate less than 15” Hg. of vacuum at idle need a vacuum advance can that’s fully-deployed at least 1”, preferably 2” of vacuum less than idle vacuum level so idle advance is solid and stable.." Just pointing out the fact that different curves suit different motors and all these curves can be had i(or learned) in one system. Time marches on....
