Fuel (Ron) Type
#21
There's no such thing as 'pre-detonation'. It's 'detonation' or 'pre-ignition'. Very different phenomena.
I was referring to the individuals who have consistently used lower than 91 fuel and suffered no ill effect. There is only speculation and theory as to what might happen from others, but no evidence to back it up.
Virtually every car or bike discussion board has the same argument- I've yet to see any cases of unmodified cars driven on the street suffering bona fide damage from use of low octane fuel.
Flame suit on.
I was referring to the individuals who have consistently used lower than 91 fuel and suffered no ill effect. There is only speculation and theory as to what might happen from others, but no evidence to back it up.
Virtually every car or bike discussion board has the same argument- I've yet to see any cases of unmodified cars driven on the street suffering bona fide damage from use of low octane fuel.
Flame suit on.
#22
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#23
that aside - it was on one of the 350z forums where someone took apart an engine and posted pictures of damage to the pistons allegedly from detonation or pre-ignition - so as stated such a small sample that it can't really be relied upon
#24
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No, no sarcasm intended whatsoever. It was a legitimate question looking for some actual evidence. This particular topic comes up almost as frequently as oil and air filter discussions and unfortunately sometimes degrades into nastiness. I choose to post in these topics as the subject is of great interest to me.
I have no doubt that pistons can become damaged (I've fried many myself)- but whether it's actually from detonation on a stock engine driven on the street continues to be an elusive thing to pin down. I've yet to see a genuine case.
I have no doubt that pistons can become damaged (I've fried many myself)- but whether it's actually from detonation on a stock engine driven on the street continues to be an elusive thing to pin down. I've yet to see a genuine case.
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deltagroup (01-14-2016)
#25
No, no sarcasm intended whatsoever. It was a legitimate question looking for some actual evidence. This particular topic comes up almost as frequently as oil and air filter discussions and unfortunately sometimes degrades into nastiness. I choose to post in these topics as the subject is of great interest to me.
I have no doubt that pistons can become damaged (I've fried many myself)- but whether it's actually from detonation on a stock engine driven on the street continues to be an elusive thing to pin down. I've yet to see a genuine case.
I have no doubt that pistons can become damaged (I've fried many myself)- but whether it's actually from detonation on a stock engine driven on the street continues to be an elusive thing to pin down. I've yet to see a genuine case.
#26
"...The F-Type does not progressively adjust for varying grades of fuel. It has two distinct sets of ignition and A/F maps (just discovered this over the past few days). It uses the high performance maps when the engine conditions suggest octane in excess of 91(AKI) and a de-tuned map that is (maybe) safely used down to 87 AKI...."
#27
Me neither, Mikey, on a stock engine. Very elusive to pin down for sure. Conservative maps and sensitive knock sensors keep things in check. The cracked pistons and plugs-missing-electrodes cases I can confirm were running aggressive curves, high boost and/or compression, or to quote from Unhingd's earlier post, "silly tuning." <--(Good one.)
#28
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Me neither, Mikey, on a stock engine. Very elusive to pin down for sure. Conservative maps and sensitive knock sensors keep things in check. The cracked pistons and plugs-missing-electrodes cases I can confirm were running aggressive curves, high boost and/or compression, or to quote from Unhingd's earlier post, "silly tuning." <--(Good one.)
Also of note, Nissan does place severe restriction on the usage of low octane fuel (<97 RON) by limiting it to essentially emergencies only and restricting the engine to lower revs and load only.
There is also discussion about the knock sensor being deactivated above 5200 RPM which would jibe with the limitations of the manual.
Such restrictions and limitations appear to be only for the Euro market cars- the N.Am versions are tuned for 91 AKI.
Hmmmmm.
#29
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