Pinging,knocking,detenation

[Flukey]

Well I have had pinging quite a bit lately and it was very noticable during the recent Snowies cruise.

Is pinging more likely to happen at say fuel tank only 1/3rd full? It was pinging quite badly just before we re-filled at Tarcutta. If so, I think my problem maybe needing a bigger fuel pump

hi Luke!

I also thought I might need a new fuel pump not so long ago (due to the go/stop/go problem I once had... ). I have been told I do not.

As you know I also had major problems with the car on the run in to Jindy.

I cant think of any reason as to why the car would be more suseptable to pinging on the last 1/3 of a tank (doesn't mean there are no reasons - just that I can't think of any... any one else??? ). In terms of fuel pressure, if memory serves the fuel pumps operate to supply fuel at 4 bar or 400kPa, change in pressure as a result in change fuel level in the tank will no more than about 1% so relatively insignificant...

Mine ran fine after adding the octane booster in Jindy, except for the fact that the exhaust manifold started leaking as we came into Melb at the inlet to the turbo. Now fixed

Simon from Nizpro has told me that the nulon Octane booster can have a detramental impact on the iridium/platium spark plugs. Poor spark could also contribute to knocking.

I would suggest you take the car in - either to Nizpro or back to HPF and have them check it out, but it would probably be a good idea to run the tank really low a couple of times and refil with fuel from a relable petrol station.

Good luck!

Ben.

My original thought was that maybe it might have been a bit starved for fuel. However, I gave the car a squirt tonight with a full tank and it pinged So, that isnt the problem.

Back to HPF.

[Geeseman]

Things that have to be considered are:- such as the intercooler suffering from heat soak after a few hard attacks, or the fuel pressure dropping off after a period of time. After all, everything wears out eventually (and usually gradually) - fuel pumps don't run the same presure from day one to the use-by date. They don't just suddenly die - it happens over a period of time and during this time the pressure gradually declines. This is just one item I've used as an example but the analogy applies to ALL the engine components, fuel injectors, spark plugs, air filters ... everything that is in the inlet tract that can have an effect on the operating efficiency of the engine.

Sorry for the long post but hope it helps some people to understand the issue.

Good points, Turbo6man.

I think that lots of customers today, and especially with the T given its great potential for increase in power, expect lots of power when they get tuned. The tuners might feel under 'pressure' to increase timing and boost, to make the customer happy, only to have that car play up when the customer encounters such conditions as you mention above when they are out on the road (conditions that are markedly different to what was in the dyno room at the time).

A point to note is that APS have always been conservative with their tunes for reasons such as this. It's easy to ramp up the power because the hardware is there, so increasing boost and timing to make a great dyno graph or seat of the pants launch may cost a lot more than your tune fee in the long run. The 'Phase' kits have set power levels for this very reason - to accomodate varying levels of engine and environment conditions.

[Adam]

The PCM will compensate for the climatic conditions.

Your car is tuned with knock control off so that the only changes that are occurring to the tune are the changes that your tuner is making. If it was left on it would be like trying to kick a goal with the goal posts always moving.

Nizpro tune your car to a safe point then take 1-2 degrees of timing out as an extra safety measure, from here your knock sensor can pull a further 8 degrees out.

[Romulus]

Pinging= Bad tuning

<{POST_SNAPBACK}>

Or bad fuel,

Sick of hearing this excuse from tuners what a joke

<{POST_SNAPBACK}>

Got to agree as well. Blame the fuel etc.

Maybe if the tune was done properly in the first place and the knock sensors were doing their job pinging wouldn't be an issue.

BTW, someone told me there's been another XR6T engine failure in Perth.....bit of a worry. Not a stock car either.

[Ralph Wiggum]

care to elaborate on the failed eng in perth?

[Xtreme F6]

.. The other I was told is running enabled knock sensors, so go figure?????

if you doubt it drop by and ill show u ther are enabled. The only time I dissable them is to tune on the dyno, then turn them back on.

[Xtreme F6]

Pinging= Bad tuning

Or bad fuel,

Sick of hearing this excuse from tuners what a joke

Got to agree as well. Blame the fuel etc.

Maybe if the tune was done properly in the first place and the knock sensors were doing their job pinging wouldn't be an issue.

BTW, someone told me there's been another XR6T engine failure in Perth.....bit of a worry. Not a stock car either.

You talking about youngys? or you talking about milz's original tune dont in perth by someone else that bent his rods with a stock car? Milz has since had his car tuned by me and is runing 12.3's, As for youngys, well lets just say he will think next time someone tells him that to much is to much he will listen

Not really much of a shock is it jason? I mean stock motors bending rods making 220 rwkw's is bad but engines making well over 350 rwkw's stock breaking, sort of expect that, specially when there have been stock motors doing the same thing as youngys with no mods..

The stuff being said about youngys engine is the exact reason why I refused to push his car past 330 rwkw's originally.. then he said this.

Youngy  Oct 6 2005, 12:13 PM

also it would be good to have some1 that's not wary of pushin mk11 internals well past the 330rwkw mark in a manual considering I have nizpro valve springs, a well run in 4500km old motor and have eliminated all the restrctions in the system so the motor and turbo aren't stressing no where near as much

SO as you can see I made it quite clear I wasnt prepared to shift his power up... Bad call on my behalf to let him talk me out of my original choice, But Youngys a nice guy and I decided against my better judgement plus I didnt like being given sh*t for not giving him what he wanted.

[Milz]

all I can say is ever since simon started doin the work on my car car it has been excellent.wat a car now unbelievable

[dingah2]

As per Adam - correctly tuned, Snowies or Sunshine coast there should no repeat no ....absolutely no detonation or need to use fuel additives.

Dingah

[Goobz]

absolutely no need to use fuel additives.

Dingah

<{POST_SNAPBACK}>

What you need to realise Dingah, is that some people(myself included) choose to have a map tuned with fuel additives in the tank(usually race/thrash map), as you are able to safely extract a bit more power. For the sake of a $20 bottle of octane booster I can get a bit more potential for my car, on a map I don't use all the time anyway. In my box I have - (1) fuel map, (2) Everyday map - 98 octane, & (3) race/thash map.

If I needed to use it on my 1 & 2 maps I wouldn't be impressed, but as my 3 is tuned for it, whats the problem?

I do agree that if a car is tuned without it and then needs it it can be a problem, but if the customer chooses to, then it is absolutely no reflection on the quality of the tuner.

I understand you choose not to use it. You just need to understand some people do...

Chris