hey guys occasionally on high RPM my car makes some sort of popping sound, and is it does so, you can feel the power drop, maybe like boost is dropping... this is on low boost aswell, so shouldnt have to worry about turbos maxing out. i done a search but couldnt find anything that seemed to match it. car stats for peeps who dontk now, TT bovs, boost controller, 1bar high jst over half low, pod, Zorst, mines chip, running 98 octane with octane booster.
That is detonation, and detonation is not your friend although you could be getting spark blow out aswell... What are you plugs gapped to?
i have no idea, ill pull em up and check sometime this week... so 100% on it being detonation? does datascan pick that up or? cos mark ran data scan on it like last week? p.s. talked to the old owner, he said he got them straight from caz, iridiums and he didnt change the gap they were suited right up.?
I couldnt say for certain without viewing it in person, but from what you've described it sure does sound like it. The simple thing to do would be to wind down the boost a little and see if it goes away, if it does then it's most definately pinging. Also there's no golden rule when it comes to gapping your plugs, if they're at the stock gap then I would try reducing it little by little and see if that helps any. It's a pain in the ass job but it's an important one because without spark you're not going to get too far! You could be lucky and just simply need new plugs! I'm not familiar with that chip, but the best way to troubleshoot these issues if all the simple things dont check out is to bang it up on a dyno and get a professional tune done. That will also show you how your A/F ratio is going as I'm sure you know lean = bad at the top end of the rpm range as you describe is where it happens. It's not your turbos maxing out that is the problem, it's that all important A/F ratio!
I good way to explain the sound of detination is.... like shaking small rocks in a can. The sound is the piston vibrating due to early spark, and being pushed down when it is trying to come up Mines ECU's have very advanced ignition timing... specially if you are running 1bar boost! I wouldn't run more than stock boost. If you want to run more, I'd have a stock ECU socketed & tuned.
no way man it doesnt sound anything like small rocks in a can... its more of a low pitched pop almost the the point its a boom... like bwap bwap bwap, sounding really high pressured air being released or hitting something...
could be pinging, it can make different sounds. Try what 300zxt said and turn the boost down and see if it goes away.
Is it only high RPM, what RPM if really high could be the rev limiter cutting in sort of sound like a key banger, or you have a failing coil pack or connector which is breaking down at high RPM. Dont think its pinging though especially if you have a loud exhaust pinging can be very hard to pickup without the right gear. Thats why cars have knock sensors.
nah not rev limiter, id imagine about 5000rpm+. so would the pinging be picked up via the data scan? how can i check the coilpack connectors?
Each car is different as to what it sounds like, and alot of pinging is infact inaudible to the human ear. But it is true that alot of people mistake pinging for a lifter tick or a spark blow out etc and without the experience of hearing each it is quite hard to tell the difference to the untrained ear so to speak. That is why I suggest for people to always think the worst, then if it doesn't turn out to be that then great! The flipside of that is "zomg my car was pinging and now I blowd my engine up lolz!" so first and foremost is to always, ALWAYS turn down the boost. Still does it? Ignition tune up and sparkplug gap check. SILL does it? (unlikely unless it's a rod knock or something BAD) then it's time to read what the AFR is doing and look into fuel delivery.
hmmm a lifter tick would be around 40dB... meanwhile this pop/booming sound is more like 90dB, if thats pinging i dont got it, no way in hell anyone could confuse this with a lifter tick, next time i go for a strap ill record the sound.
OH YEAH something i just thought of, it doesnt do it in 1st gear... but in second gear i do get it? not sure about any others...
I wouldn't be thrashing your car just to show people the sound it makes as that could be the last trip you make... You need to work this out before driving the car hard anymore, just do what I said above. If turning the boost down makes it go away then there's your answer, if not there's other things to try. See above... Detonation a pre-ignition is VERY bad, it's better to be safe than sorry otherwise you might end up pulling a piston that looks like this!
You seem very reluctant to turn your boost down for a minute to do a quick test The relation to gearing makes it even more likely to be detonation as there is more load.
just a quick question its not just a boost leak and you are getting a crap load of fuel and back fireing are you
ive not shown one ounce of reluctancy to turn down the boost at all? majority of communication with the english language is in body language maybe thats why your so far off. i had boost leak fixed and shes off safety boost datascan said she was running fine, so no chance its that... and ive never heard of rapid back firing before due to a boost leak.
No, he's saying turn down the boost to see if that's causing pinging. Having no boost leaks makes it more likely to be boost related, as now you have more air pressure hitting the engine. If you turn down the psi to say 12 and it stops happening you have your answer.
well he said that he is running his EBC on low setting, which is just over half a bar, which is like 8 psi, so I'll just assume he's running stock 9 psi boost when this happening, he said this after all. How can he turn the boost if he is running stock boost? I had some pinging and it sounds like rocks being shaken in a tin, everyone I've spoken too has said this.. I don't think a 90dB boom is detonation. I'm no mechanic and I'm not that experianced I'm just reading what he actually said before giving him my ideas. I don't think its pinging, does the boom repeat, almost like a rev limiter? rom-vg30dett had a similar problem that ended up being something pretty minor.
