Lancair wrote:EGT taken after the turbo is of no diagnostic value my loacl diesel guy tells me. Its before the turbo that tells the best story. After the turbo its cooled significantly, and 430c is cool for a diesel EGT. Apparently stock D4D should be around 490 -520 before the turbo.
Lancair
dirtyharry wrote:My eyes are glued to this thread trying too decide whether to "Chip It" or stay stock! The EGT's are the only concern for me. I'd be concerned mostly only when i'm towing. I tend have a heavy foot too which may not help the cause!!
tonymtber wrote:With any diesel, 550 degrees POST turbo is considered a good safe level. Some people will push this out to 600 degrees but the higher you go the more stress & possible damage can be caused.
The difference between POST & Pre turbo temps vary from vehicle to vehicle, but can be as much as 150 degrees higher than post turbo (on some vehicles it can be as high as 200 degrees). Fitting an EGT pre turbo is preferred, but due to the modern design of vehicles, most probes are fitted post turbo. I think 720 degrees was considered the safe level PRE Turbo (cant remember exactly as I've always fitted my probes POST turbo).
With the tuning of any diesel, the correct air/fuel ratio must be maintained to keep EGT's at a safe level & with modern common rail engines, the ECU makes this a simple thing to do. With a simple chip installation & no other engine mods etc, you shouldn't have any probs gaining some good power with little or no change to EGT's.
Lancair wrote:OK, Im only repeating what my mechanic told me on monday. Maybe he is misinformed.
I thought you told me that your EGT probe was pre turbo and that 650 was getting too hot ? ?
I think Im going to sell my chip as the vehicle is worth too much to me to be f##king with it without solid data. I had the death rattles going on, with the chip in, at highway speeds and at normal running temps on my trip south but didnt notice it at all with the chip out on the return trip. No rattle at start yesterday morning with chip out but this morning with chip in my little boy asked if the engine was broken
rodw wrote:Lancair wrote:EGT taken after the turbo is of no diagnostic value my loacl diesel guy tells me. Its before the turbo that tells the best story. After the turbo its cooled significantly, and 430c is cool for a diesel EGT. Apparently stock D4D should be around 490 -520 before the turbo.
Lancair
Can't see figures as being correct. I have seen EGT's over 600 degrees from the Stock D4D post turbo (no chip) on several occasions.
CHIP IT wrote:rodw wrote:Lancair wrote:EGT taken after the turbo is of no diagnostic value my loacl diesel guy tells me. Its before the turbo that tells the best story. After the turbo its cooled significantly, and 430c is cool for a diesel EGT. Apparently stock D4D should be around 490 -520 before the turbo.
Lancair
Can't see figures as being correct. I have seen EGT's over 600 degrees from the Stock D4D post turbo (no chip) on several occasions.
was the 600 deg in Fahrenheit ???
600 deg C, after the turbo, seems a little high from a standard build.
Remember, most stuff coming from USA is in F.
2alandvan2 wrote:I have still not heard an explanation for louder motor ticking sound? This has been experienced by a couple of people. I would like a response from you Robert.
2alandvan2 wrote:I have still not heard an explanation for louder motor ticking sound? This has been experienced by a couple of people. I would like a response from you Robert.
CHIP IT wrote:2alandvan2 wrote:I have still not heard an explanation for louder motor ticking sound? This has been experienced by a couple of people. I would like a response from you Robert.
The ticking is the injectors. They are now injecting more fuel. It is quite normal but now this extra fuel is being injected lower in the rev range where it is noramlly quieter... but you should hear it at idle.
Cheers
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