Is Anyone Very "in Tune" With What Pinging Sounds Like Inside A R33 Cabin?

[sadr33]

I cant tell if my engine is pinging or not because I hear the noise but cant be sure!? Its recently come up.

For months I thought It was something loose but Ive been trying to fix those and I still hear it. It sounds exactly like knocking, a rattling coiny noise that comes after about 5000rpm under WOT. Its very noticeable.

I can be at 70% throttle, 5000rpm, steady, all fine, then I go WOT suddenly I hear the noise.

The trouble is I have a LOT of loose stuff that make almost identical noises and as the rpm increases the natural skyline VCT vibrations kick in. The dash rattles, the pillars creak. The seats creak, and tiny rocks that get caught in the tyres and get throwing in the body maxing coiny rattly noises. The bonnet and front kit isnt the tightest fitting either.

If there any way of knowing aside form a tuner, and how much does this cost?

It would be great if anyone that can tell it apart well could take a listen?

I know these common engine changes things affect pinging.

Increasing Timing

Running hotter plugs

Running more boost.

But what about spark plug gap? The only thing I have changed since the noise starter is I was having a murmur/burb under idle the recommended 0.8 gap so I went up to 1.1 maybe even 1.2. Murmur is gone, but now that pining noise is

The only thing I can think of is I was going to use new plugs as I don't like gapping however I was convinced to I re-gapped em anyway, when a mistake was made I tapped the top of spark plug ground electrode on rough cement. I'm sure this created jagged edges on the metal of the plug which likely acting as a super heated hot spit in the combustion chamber and causing additional ignition in addition to the combustion chamber this pinging?

One last question. Any experiences of things going wrong running the manufacturer recommended heat range of 5 i.e bcpr5es instead of the bcpr6es most recommend? I only run 10 psi max.

Next step is to try new plugs that haven't been mashed on cement to see if that fixes it, but I want to run bcpr5es. I want to get the mostly stock engine running as optimally as possible thus the hotter plugs.

P.S how much damage can you do in about a month of pinging, about 150-200 WOT "runs" in that time ( where pining certainly happens)

Edited December 13, 2012 by sadr33

[StevenCJR31]

sounds like you need to go over the whole car with a spanner and tighten up evrything that is loose and go from there. . .also fuel choice can affect pinging too

[sadr33]

Never run anything other than V power. I cant really help the bonnet as the latch that keep it shut has play in the teeth, its not about spanners. I did fit new mounting rubbers the bonnet sits on though which helped. IM 99.999% sure the bonnet isn't making those types of noises though. The dash I have nfi how to stop making noises.

I tightened up the front bar and grills as much as I can but it really needs a professional fit maybe even repair which is costly.

Edited December 13, 2012 by sadr33

[wolverine]

How about sticking it on a dyno with an experienced tuner listening?

Crazy idea, I know, but it just might work.

ps. to answer the question of how much damage can it do...it can only wreck the engine.

[AngryRB]

Never run anything other than V power. I cant really help the bonnet as the latch that keep it shut has play in the teeth, its not about spanners. I did fit new mounting rubbers one bonnet sits on though which helped. IM 99.999% sure the bonnet is making those types of noises though. The dash I have nfi how to stop making noises.

I tightened up the front bar and grills as much as I can but it really needs a professional fit maybe even repair which is costly.

drive it along side some concrete barriers like an on ramp, you'll hear it clearer, sounds like pinging to me..

Edited December 13, 2012 by SliverS2

[sadr33]

How about sticking it on a dyno with an experienced tuner listening?

Crazy idea, I know, but it just might work.

ps. to answer the question of how much damage can it do...it can only wreck the engine.

Is there any group dynos happening soon or recommendations? They seem a bit pricey otherwise.

[sadr33]

drive it along side some concrete barriers like an on ramp, you'll hear it clearer, sounds like pinging to me..

Yea good idea actually. But I cant build boost and got WOT long enough on a ramp lol Ill fly off the building. Ive been across a few roads like that where you hear your car echo close and very clearly but remember off the top of my head.

[34GeeTeeTee]

Is there any group dynos happening soon or recommendations? They seem a bit pricey otherwise.

You do realize Dynos are an expensive bit of gear? And you get what you pay for?

[Lithium]

How much boost are you running, and with what mods? It sounds like it could be.... and if your car is that noisy then quite bad.

[sadr33]

You do realize Dynos are an expensive bit of gear? And you get what you pay for?

Yea they cost about 100k and some of the nastier ones can be way off in terms of figures.

I get it though I'm only trying to determine is my car is pining I coudln't pay more than about $80.

I

'm running 10 psi. In terms of mods, not much. 2 stage boost contoller (holds boost fine) Yellow jacket coils, and forged internals.

oh and just kidding about the last one. no major engine mods

Anyway about the car knocking, doesn't ECU detect knock and retard the timing and if so and flash the check engine? Or put the car in limp mode?

OR does it have only limited adjustability i.e 5 degrees +- and if knock is caused by sharp objects in the combustion chamber such as a flake hanging of a spark plug it cant do $h!t about it?

[Lithium]

Stock intercooler? First thing I'd try is bring the boost right down to stock.... see if it goes away. If it does, then that would be a good start.

[DVS JEZ]

Also check base ignition timing. Make sure the CAS is adjusted properly.

Alot of cars i have had come in have had the CAS over advanced causing them to ping with the stock ecu.

[kitto]

Is there any group dynos happening soon or recommendations? They seem a bit pricey otherwise.

Quick dyno tune is cheaper than a new engine..

[simpletool]

Also check base ignition timing. Make sure the CAS is adjusted properly.

Alot of cars i have had come in have had the CAS over advanced causing them to ping with the stock ecu.

And make sure to take into account parallax error

Could be pinging, especially stock ECU, 10psi and flooring from 5000rpm. The process of AFM > ECU > timing change isn't especially quick in that region, compared to the ability of the tiny stock turbo to overboost. If it's a high pitched rapid semi-regular tinkle then it's probably pinging.

Edited December 14, 2012 by simpletool

[Dose Pipe Sutututu]

a metallic pop corn popping noise (if you're exhaust is quiet) other than that hard to detect in cabin

[HR32GTS 4DOOR]

The sharp bits you knocked on the ends of the spark plugs usually don't cause pinging. It would however cause pre ignition which is much worse, but you would know if it has happened. As above, check the base timing it is probably over advanced, also the stock intercooler isn't to "more than stock boost" happy.

Also the ecu does have knock protection, but it isn't actually that good and iirc it doesn't do much to pull timing/add fuel above 4000 rpm

You may have a slight exhaust leak. sounds weird but I had that problem, sounded like pinging but turned out to be a sh*tty turbo/mani gasket

[MagicMikeZ32]

Retard cas to be safe all round.

[Dose Pipe Sutututu]

Retard cas to be safe all round.

hahah that's what I did, coz I poor karnt and run 95.. waste of 98 on a stock car

[JustinP]

semi-regular tinkle

Thats a good way to describe it. The semi regularity (but still rapid) nature of pinging is a good way to differentiate it from from other more regular vibration kind of noises. Still its pretty quiet so it still can be hard to hear over all the other engine / exhaust noises.

As others have said, if it is pinging and everything is pretty much stock, it's most likely your base timing is out and you need to adjust your CAS.

[sadr33]

The CAS was rotated to the left, not all the way but almost as far as it goes. I put the bolts back to the center where it looked like the original grooves and dirt marks were, it slotted in easily and snugly so I'm sure this is the original position. FAAAAAARK@!!!!! pinging gone .

Most people would be happy but I'm pissed because it means all that times damage was being done. This is what happens when you have more than one problem with a car, they escalate exponentially. My front bar was loose, making a clattering noise, almost identical to the pinging, I was almost certain it was that making the noise, but it wasn't.

I recently had some of the belts at the front including the timing changed. Don't you have it when you spend money hopefully for the better of the engine and it turns out fiddling with it screwed you over the belts weren't even that bad. money spent going backwards. argh

Anyway now the car feels slow as. Feels like I lost 70-100hp and engine feels like its running in slow motion. I don't remember it being this slow before these problems arose and I have put everything back to the way it was. So the pinging has done damage causing a loss of power?

About pre-ignition The reason I started changing plugs and increasing gap is because I was also getting a sudden "jerk" out of the engine every 10 seconds or so at idle, like someone just kicked it real hard sideways very very like a misfire on boost which I have felt in other cars, but at idle.

The best way I can describe is the feeling you get when you drop a piece of ice into a blender. It runs smooth then all of a sudden when the blades munch whatever is in there there is a shudder and then it goes smooth again in the space of a second. Is this what pre-igitnion feels like? Under throttle it was fine as far as as the "kick" goes, only the pinging was there.

People told me it was a harmless misfire but I have new yellowjacket coils that can handle 1.1mm at 10psi no problems, why would it miss under idle if it doesnt miss under WOT. it didn't make sense to me but I took the advice.

So I was getting both knocking and pre-ignition wasn't I?

Edited December 15, 2012 by sadr33