Pinging

[deano27]

Hi Guys,

I have a fairly stock R34 GTT, full exhaust, FMIC, pod filter, BOV, AVCR.

I have set low on the AVCR to 0.5bar and high to .75bar.

I have noticed especially on high boost pinging at and above 4000rpm.

What causes pinging, and what sort of things can resolve pinging?

[R31Nismoid]

Too much timing, poor fuel, not enough fuel

So it'll either be your running too much timing, or fuel pump dying and/or blocked fuel filter

I assume your using PULP... so one of the above

I would go and get a FULL service, oils, plugs, filters and THEN put it on a dyno and check the AFR's and go from there

[JonnoHR31]

is it pinging or missing?

[deano27]

i get both. When changing gears and driving normal I get the gurgling missing or backfiring sound, but when hard on the throttle going above 4500 revs I can hear definate pinging.

[R31Nismoid]

As per what i said dude, it doesnt seem like you've done any troubleshooting at all, so time to hand it over to professionals

[deano27]

Yes i think you're right. I already did a service about 1000kms ago, s i will book it in for a dyno.

Will the gap of the spark plug make a difference? I've got the 1.1, should I go for less?

[PM-R33]

Most people can't hear detonation, easiest way to describe the sound is the sound that is made on a geiger counter that detects radiation. This is what you are hearing?

Very rare for the stock ECU (with only such minor mods) to allow such audible detonation at only 4000rpm, hence why im thinking it might be something else that you think is detonation.

[deano27]

yeh sounds like little stones being thrown under the bonnet

[blind_elk]

The term is PINKING. And if you can hear it, you are already in trouble.

One other cause can be a spark plug with the incorrect heat range - it runs too hot and pre-ignites the fuel / air mixture.

[blind_elk]

Have a read:

http://en.wikipedia.org/wiki/Engine_knocking

[PM-R33]

Lol at pinking. Not in the UK bud, no one calls it pinking here.

[Wacky Dee]

I've never heard anyone call it "pinking" before either lol It's eithet dotonatin/knocking or pinging.

Anyway, I have tried to hear an engine pinging when the tuner said it was doing it ..and I was right next to the engine with the bonnet up and I couldn't hear shit over the engine noise.

So for you to be able to hear it from your driver seat whilst driving .. hmm, it's either not detonation or you've got some violent detonations and the engine is about to blow up

[Wacky Dee]

By the way, at the very least you should have your ecu remapped if you can't afford an aftermarket one .. Toshi here in Sydney does a GTT for $400 I believe. He'll fix up your ignition timing and AFRs to prevent detonations

I think there's a guy called Dr Drift down in Melbourne who does the same thing.

[deano27]

Just ordered myself a Walbro fuel pump and will be changing that, will also get myself a fuel filter on the weekend.

I have booked my car in for a remap and dyno run with Dr Drift, but he couldn't fit me in till mid may so I will just have to wait until then.

Thanks everyone for all the advice I appreciate it :-)

[Wacky Dee]

just take it easy and drive off-boost until Dr Drift has tuned it if you're certain that it's pinging or you might be up for a new engine and that ain't cheap..

[deano27]

Ended up being fuel. I refilled with BP Ultimate and took it for a squirt and the pinging was gone.

I had bought the fuel filter and fuel pump before refilling so decided to change those anyway. Probably better to have new better stuff anyway.

Still gonna get it tuned though as I have been hanging to do it for a while and this just gave me the push I needed to book it in.