This is getting out of hand, but I'll play one more time...
Quote:
"i'm not confused; numerals refer only to the volatility of the fuel."
Unless you're peer posting under a different handle, I wasn't referring to you. My post was a follow-up to
his post. Are you peer?
Quote:
"how is it better behaved? does it ask permission before pre-detonating? it doesn't detonate as easily, that's it."
Bingo. It is better quality (better behaved) because it doesn't detonate as easily.
"how about diesel engines?"
Non-sequitur.
"what are these "highly desirable burn characteristics" you're talking about? "
Resistance to pre-ignition.
Quote:
""making the premium fuel necessary in some engines that require it.""
"agreed, except for the "necessary" part."
Really? You know more than the OEM's? Cool.
A high compression or turbo engine "requires" high octane gas. You own story about your boost gauge proves that. The protection that the OEM builds into the engine management is just that... protection. The engine wants/needs/requires premium to operate in its design performance envelope. The OEM tells you that. You're smarter than they are?
Quote:
"that's the point of the thread."
Actually, the thread was started by someone asking if 93 was necessary. You replied "allegedly (it's recommended). i'm sure there'll be disagreement, but i don't think you'll blow up if you run 87. you most likely won't be as fast, and i probably wouldn't flog the car through extreme heat/mountains/etc."
Actually, it
is recommended, not just "allegedly". You don't "think" it will blow up. That makes us all feel more secure. You agree it will lose power. That's
my point... thanks.
Quote:
"what would be the "first" ditch effort to save the engine?"
Retarding timing, enrichening the mixture, cutting fuel/spark are some that come to mind. You do realize that the boost is produced by exhaust gases, right? It could be you are seeing the results of other adjustments when you see boost drop. Kill spark, kill fuel, reduce exhaust gas, boost drops.
"no, this is the first and only adjustment made in response to pre-detonation. if i (and the knock sensor) don't notice pinging, then it ain't happening. and agreed, that's the engine management system doing its job--preventing potential engine damage."
Did you write the software that runs the engine computer? Are you completely sure that the turbo boost is the only response that it has? Cite? Besides, the knock sensor can hear pinging before you do.
Quote:
"the manufacturer specifies it because under some circumstances, you won't get as good performance, and possibly fuel economy, on lower grade fuel. not always, not even usually. they specify it because it gives an extra margin of safety which may or may not be needed. "
Is it performance, or safety? You bounce around in your thought about why they specify premium. And you also wrote that you "don't think you'll blow up if you run 87", but now it's for safety? What exactly is it you do think?
"it's quite possible that the engine detunes under some circumstances when using lower grade fuel. is that dangerous to the engine? no. does it degrade performance under these circumstances? yes."
No... it's a fact that it detunes. The OEM's state that is exactly what they do.
"which engineering class explained to you the differences between premium and unleaded fuel and their effects on sports car performance? right, that's what i thought. if yer gonna flame, maybe you should have some facts or references to back up your bs?"
I'm waiting for your cites, references, and engineering classes to back up your BS. If you require them for me, surely you have them for your own BS, right?
BTW.. I didn't flame you. You seemed to take it personally. Maybe you should learn to read a thread, and remember what you said back in post two of this thread, " i'm sure there'll be disagreement". There is, and you're surprised?
BTW... pony up for a shift key. Capital letters... what a concept.
