Pre-Detonation or "Pinking"
#1
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Can anyone describe the issue concerning pre-detonation or pinking. I know what it is - i just can`t tell if my 8 is doing it or not. I`m suspicious though....and somewhat concerned. I always run at least 93 Octane, sometimes 94. On acceleration in any gear, from about 2500 rpm to about 4000 rpm i get a light plinking noise, metallic rattle from the engine which goes away at higher rpms. It sounds very much like a conventional engine with a loose camshaft drive chain. That type of noise.
I have read all sorts of wierd and slightly potty sounding theories about pinking causing premature rotor tip seal wear etc, etc.
Anyone know about this subject? Any dealer experience? - my Mazda dealer tried to convince me that i was not using the right octane of gas which really pissed me off.
Yours hopefully - Tom
I have read all sorts of wierd and slightly potty sounding theories about pinking causing premature rotor tip seal wear etc, etc.
Anyone know about this subject? Any dealer experience? - my Mazda dealer tried to convince me that i was not using the right octane of gas which really pissed me off.
Yours hopefully - Tom
#2
Ive gotta 2k5 6-speed and it does it as well. I notice it at the rpms you mentioned...and from about 6k - 6250k. It's got about 940 miles and I dont abuse my car. From what I hear, it's normal...
#6
Here is another question. I notice that when I left off of the gas pedal my 8 sounds as if it slightly backfires. the performance has not taken a nose dive so far I just want to make sure it isn't too serious.
#8
Good I have had it to a dealership for routine maintenance and they have never said anything. I do have a GReddy SP2 with a high flow catalytic converter on it so the backfire is probably just pronounced a little more.
#9
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pinging on my 8 sounded like a pepsi can crushing, very painful sound. I was/will be again turboed don't know if that altered the sound or if yours would sound like that or not.
#19
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Originally Posted by djseto
Our cars shouldnt be backfiring right? Isnt the ECU suppose to adjust the air/fuel to eliminate backfiring or popping? I have yet to hear any abnormal sounds from my 8 w/11K miles
#20
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Originally Posted by Brice-RX8
Why do you think that is rubbish?
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no, the car isn't a torque monster, but it makes more than enough for normal, daily driving, at rpms below 3k even. if you are experiencing dangerously low power below 3-4k rpm, then have your dealer inspect your coils.
#21
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You are correct, but if you want any sort of acceleration then you will need to drop it a couple gears from there and get going.
I don't know about you have to shift fast as hell to keep it below 3k when going through the gears, boy does it rev fast!
I don't know about you have to shift fast as hell to keep it below 3k when going through the gears, boy does it rev fast!
#22
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Originally Posted by Brice-RX8
You are correct, but if you want any sort of acceleration then you will need to drop it a couple gears from there and get going.
I don't know about you have to shift fast as hell to keep it below 3k when going through the gears, boy does it rev fast!
I don't know about you have to shift fast as hell to keep it below 3k when going through the gears, boy does it rev fast!
and it doesn't feel like i'm shifting through the gears all that quick. let it leisurely climb to 2.5k-3.5k rpms and then shift. repeat.
i said rubbish before because there are some people that honestly think the car is incapable of movement at anything under 3-4k rpm. i'm just trying to at least partially dispell this myth one thread at a time.
![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
one person even said they have to rev to at least 3k rpm to launch in first or else it will bog.
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Last edited by Glyphon; 10-17-2005 at 03:03 PM.
#24
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Originally Posted by Brice-RX8
I feel the same you do. It does have power below 2k, but sometimes it is nice to hear the 3-4k rotary hum.
![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
but there's a difference between "you have to stay above 3k rpm to have power" and "the engine is at its best at higher rpms".
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#25
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Originally Posted by miker2005
i have the same sound and i dont think its pinging; id like to hear somebody give a definitive explanation of what it is tho;