CRD overfuelling ?

[Jamiepatrol]

Hi guys. Happy new year from Jamie.

I have a feeling that my CRD is overfuelling. Is there any way to adjust fuelling / air rations, other than a chip ??

I believe my boost is just right, so I don't know how adjusting boost will help. I'm about to do the NADS< but other than a faster spool up with the needle valve, i don't know how a dawes valve would help me? But please smebody correct me.
My reasoning behind this is the following.
@ 100km/h my EGR sits on 400 - 450C boost hovering around 10-12, I believe this is the way it should be boost , btu albeit that its still EGT too high? This is on 33" all terrains, not towing no NADS and no EGR blocked with an ambient temperature of around 26-28. I believe this is a bit too high in terms of EGR after my brief research on these forums.

Around town it's 200-350 etc... A bit more if I give it to it.
Also, the cat of my beautidert exhaust begins rattling once it's heated up, for example after a brief run on the ring road at 100km/h. I'm told this could be due to too much unburnt fuel accumulating in the cat and it burning off in there instead of in the chambers?
Wil the NADS helpe me if it is overfuelling or, is this another sinister problem?
If so, how could it be controlled?

Thanks. Jamie.

[threedogs]

The rattle will more than likely be your heat shield , you
could block your EGR so exhaust gas escape quicker lowering your EGTs.

check all hoses are tight, clean MAF

[Maxhead]

@ 100km/h my EGR sits on 400 - 450C boost hovering around 10-12, I believe this is the way it should be boost , btu albeit that its still EGT too high? This is on 33" all terrains, not towing no NADS and no EGR blocked with an ambient temperature of around 26-28. I believe this is a bit too high in terms of EGR after my brief research on these forums.

Around town it's 200-350 etc... A bit more if I give it to it.


Thanks. Jamie.

These look very much like my temps and boost. I can get to 650degC towing if I let it...LOL I have no nads.
You will find most CRD's will have similar figures. You can drop EGT by blocking the EGR but might get boost issues.

Whats your fuel economy like? I get around 12-13lph

[Winnie]

The engines do run hot like that from factory... Surely they are built to withstand the temps.

[Maxhead]

The engines do run hot like that from factory... Surely they are built to withstand the temps.

Yep, They are designed like that and those temps are normal

[Jamiepatrol]

@ threedogs
The rattle is 100% at the cat. Once it heats up a bit and begins rattling, if i jump out and hold it with something it stops the rattle. All mounting points of the exhaust are super tight and its not up against anything. Once EGT's drop below 300 or once at idle, rattling stops.*
I have a brand new MAF installed and it made stuff al difference. I'll block the EGR when my nads get fitted. That way i can at least manage any consequent boost issues.*

@ Nisshead
I noticed a few people having such temps and boost, but then i've also noticed a few have lower EGT's even when towing.*
Fuel economy i dont know yet as my tyres are fresh so still going through a tank but the 33"s definitely are felt on the foot i had to adjust my driving / acceleration and gearing to suit.


To be honest I'm not fussed one bit about the fuel economy. My main concern is if it is overfuelling, that supposedl can leat to warped */ cracked EGR tubes and or exhaust manifols which is a ton of $ to fix up. I'd like to preevent that as much as I can because this car is a long term family car for us. Big trips planned.*

Thanks for the replies.

[Maxhead]

Is the cat discoloured due to heat? Does it glow red on a long run??

Also any smoke???

[Jamiepatrol]

Is the cat discoloured due to heat? Does it glow red on a long run??

Also any smoke???

Not glowing red or anything. Just rattle noise coming of it felt. Throughout the car.
Also no smoke unless I really gun it. Even then nothing much. The other thing I forgot to mention is sometimes it drops dark patches on concrete under exhaust outlet. Multiple droplets of crap. It didn't do this prior to getting the exhaust fitted.

[Jamiepatrol]

Also all the power is there I don't lose much power unless its really hot and air con running. But for example I'm doing 90-100kmh in 5th its manageable once I hit cruising speed. But if step on it to gain some speed or overtake the engine feels like its labouring. Or under stress hard to describe.

[threedogs]

Maybe the guts of the CAT are blocking the exhaust flow ,
Fit a sports/ racing CAT, or Gut yours and re weld