Water Injection

Someone will correct me if I'm wrong but water injection in a diesel wouldn't be a good thing.

This is reserved for petrol engines that have much lower compression ratios.

Backing the foot off as in slowly lift it off the floor until a drop in performance is felt and then lower back down a smidge will give the engine only the amount of fuel it needs. Overfuelling will cause the egt's to rise.
Or go down a gear.

Cheers
Dave

Hi Jugga,
And welcome to the site.
I don't have an answer to your question, It maybe better asked to the guys at Lcool, become a member, Anything to so with 80's they'll know about it.
I'm sure you will get an answer to what your chasing there. A very helpful bunch they are. Now I'm not say the knowledge isn't helpful here either. ;)

Several ways to reduce EGT in a Diesel.

1. Install a EGT gauge and drive accordingly. Shifting down and running the engine at it's sweet spot is one way.
2. Install a larger exhaust. I have a 4" dual exhaust on my Duramax and it does
reduce EGT by 5-8% under load.
3. Water vapour injection is a possible technology (used in the US on diesels) and can be triggered by EGT temps or revs, but I think it only makes sense on larger volume engines.

Gas will increase EGT when you keep the accelerator floored. Gas DOES NOT reduce EGT primarily. It is only a secondary effect when you back off with the accelerator due to higher power.

If the first 2 methods does not keep it a bay you either ask too much of your engine or your engine does not burn all the fuel it should. Injector cleaning might be an idea

good luck
gmd

Is the exhaust gas temp you are seeing within spec and safe for the type of vehicle you have and the type of driving you do or is above acceptably levels?

No use trying to fix a fault that isn't there in the first place.

Yes, water injection will reduce EGT's, will also make it run better. Most owners set the injection up so that it comes on at certain boost pressures. For security, you could set yours up with a thermo switch set to your desired EGT and let it come on then. check out this site for a couple of guys who've fitted water/meth injection.

Intercooling will also drop your EGT's and will be a lot easier to install. What are your EGT's at currently?

I was getting high EGTs on my pajero, such as 840c before the turbo.

Turned the fuel back slightly so I get max of 700C before the turbo.

Almost the same performance, and EGTs OK now.

Need lots of fuel to get high EGTs :o)

I did try some extra boost (3 psi more) for more air, but not that much extra performance, and just working the engine harder.

I also change down to a lower gear earlier too, 2500 rpm instead of 2000rpm, when climbing hills with trailer on back, and sit on 2500/2800 instead of lugging it at 2000/2200. More air, better cooling to the combustion chamber, lower EGTs.

Did think of a water spray on the intercooler fins to lower EGTs. But how much water would I need? A pain to keep topped up. Friend in EVO with water injection soon uses his 2 litres when it is going hard.

Jugga

I am unsure about water injection
BUT

Changing your driving habits, will be the best way to drop your EGT's.
Better to never load up the motor, ie change down gears as soon as you feel the motor drop "free reeving".

When I tow I seldom use 5th gear (only down hill) I just keep the revs up.

Cheers
Bucky

G'day Jugga.

Do a google search for "methanol injection". Will bring up a few pages from the US that sell kits. About $4-500 delivered. You can also make your own with a bit of research.
Will lower EGTs and give a bit more power when set up properly.

Sculls.