Thread: D4 and Remap Impacts on crankshaft etc>

Originally Posted by discorevy

Yes, simplistic, but how else would you expect the torque curve to be improved?.
There's a difference between pulling a camper trailer and a 3.5 tonne Caravan through hot and hilly country



Gavin, I had forgotten yours was the 520nm TDV6 so, considering your mechanical sympathy, you'd be fine to go the 600nm of the SDV6. 700nm tends to warp exhaust manifolds with towing heavy and as you know there's a bit more involved than a TD5

Torque has nothing to do with warping exhaust manifolds (and I've not heard of that problem in a D3/4 engine?). High Exhaust gas temps (EGT) will affect pistons and ex manifolds.
As I said, the latest RRS has 700nm torque and no probs that I've heard of.

Originally Posted by Discodicky

High Exhaust gas temps (EGT) will affect pistons and ex manifolds.
.

Some tunes increase the EGT's,which caused the issue.

Stock there are no issues.

Originally Posted by gavinwibrow

g'day Craig. I have a slight suspicion that I might already have the SDV6 remap . The car goes well and was previously owned by a Barbagello manager who was planning to turn it into a tow tug but got sick and sold it off - will find out with Cambo).
If I do go the whole hog, shouldn't I be safe with the manifolds if I use 600 degrees at the EGT sensors as the backoff temp (and maybe up to 650 very short term if needed?)

650 deg is fine.
It's only if you get up around or over 800 deg for some time that you possibly may expect problems.
At what temp do alloy pistons melt...........
I've seen mine dump trucks up around 900 deg and still survived.

Originally Posted by Discodicky

Torque has nothing to do with warping exhaust manifolds (and I've not heard of that problem in a D3/4 engine?). High Exhaust gas temps (EGT) will affect pistons and ex manifolds.
As I said, the latest RRS has 700nm torque and no probs that I've heard of.

Have a look at this,Post 30 is interesting.
There is not much JC doesnt know about LR's.
But tunes are different,some much better than others.
i had my D4 tuned,for 9yrs,never had an issue,had the BAS tune.But it was the 2.7L.
Huge increase in drivability,torque,reduction in lag,etc.

Are the EGR sensors before the Turbo on the 3.0L?

3.0 D4 re maps

Originally Posted by scarry

Some tunes increase the EGT's,which caused the issue.

Stock there are no issues.

Some of the el cheapo diesel tunes (eg, "chips") simply push in more fuel to increase hp and not taking into account all the myriad of other parameters (throttle position/engine temp/rpm, etc etc).
These are the tunes which will potentially cause engine failures and in particularly high EGT's.
I had one such on my 2004 GXL Cruiser when I bought it in 2007 and removed it due to the risk of engine damage was too high.
Was far too easy to see the EGT's rise unacceptably.

Generally speaking, high EGT's are usually caused by the above (sub standard re-maps/chips) and/or driver negligence. ie, pushing foot through floor at low rpm which is stuffing heaps of unburnt fuel through the engine and due to poor/inefficient combustion, it raises EGT's.

Keep your rpm up, foot NOT thru the floor, and engine efficiency is at optimum. The EGT's will be fine under those circumstances.

Originally Posted by Discodicky

650 deg is fine.
It's only if you get up around or over 800 deg for some time that you possibly may expect problems.

I'm assuming these are manifold temperatures. My D3 has the EGT sensor post-turbo and I don't see anywhere near that.

I haven't remaped because the gearbox is only rated at 445NM and it has a ****y little clutch, let alone fear of doing another crank.

Just another angle Gavin, it might have a tune already, but it might not be the one that you want, it might be wise to just get cambos tune just so you actually know what you have.

A smoother running engine will help the crank last in all cases, there was a guy on here chasing an engine misfire which turned into a snapped crank!

Originally Posted by BradC

I'm assuming these are manifold temperatures. My D3 has the EGT sensor post-turbo and I don't see anywhere near that.

That is why i was asking,does anyone know for sure?

I watch the EGT's,and other Temps on a readout on our LC,and i am yet to see them over 490 degrees.Most of the time they sit around 300 to 350 depending on ambients,load,etc,etc.They can rise quickly once a large hill comes along.Even in soft sand,Low Range on Fraser,35 ambient,they didnt go over 480 degrees.
They are situated post turbo,just in front of DPF's.

i recon before the turbo is probably better as the reading is more accurate,and its the exact reading.