what all can change where the timing should be? does degreeing a cam affect this? what about any mods? (besides f/i etc that need less timing)?
I ran 89 with 14 degrees timing, but it might make a difference that ALL gas in my state is atleast 15% ethanol. Soon i'll be running E85. That stuff is saweet.
I find that hard to believe. There are some schools of thought that anything over 18 is bad for a regularly driven car, even with premium (91+). tho, like someone said before, ethanol blends are common in fuels today, so maybe the fuel you use has some ethanol in it (effectively increasing the octane rating)? Do you regularly use additives like Sea Foam?
I'm not trying to call you out or anything, but 18-20 degrees seems like it could almost be counter-productive. Keep in mind the EEC-IV will compensate for some amount of knock by retarding the ignition.Anyway, beautiful car man.
That is not true. The eec iv has no knock sensor so it can not retard timing based on knock. I wish it did. It would make it easier to tune for boost.
87 octane here in both my 5.0 and 2003 GT
Why?
It's cheaper, and burns more efficiently anyway.
Higher octane is not "better" anyway. It's a huge myth. Different engine setups require different octane levels depending on timing, boost, tune, etc. But having a octane number that is high does not signify "higher performance".
I can fill you in to a degree. It's easier if you can see what the eec uses.Wow, you're right. I read in the infamous "The Official Ford Mustang 5.0 Technical Reference & Performance Handbook" that the EEC-IV compensates for knock, but I was just looking at a wiring diagram and it seems the 5.0 doesn't have a knock sensor after all.
Which confuses me. Is the information in TOFM5.0TR&PH incorrect or is there another way to detect or predict engine knock with the sensors the EEC-IV uses?
So is the spark map on a stock EEC-IV "dumb" and stays constant aside from initial advance? Obviously it has different operations for different conditions (part-throttle, WOT, deceleration, start-up, etc) but will the computer make changes to the original spark map with changes in environmental factors or modifications to the engine?
This is getting into a tuning conversation- who can fill me in on this?
SUNOCO ULTRA 94 or Aviation fuel!! but its expensive!
FYI -Yeah, I have pushed the timing ahead a bit. I hand-tune until it runs the way I want it. It's probably about 15 degrees ahead or so. I'll have to check, but I do like the way they run on 92, and with advanced timing, much better.
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