Thread: turbo fitted and running

Originally Posted by lambrover

ok thanks, yes I will be intercooling most likely water to air. do you have the oil squirters onto the pistons? 15 psi would be nice but I will intercool it first.

No oil squirters, mine was an NA engine like yours. IMHO they aren't really necessary, well at least in the late 4BD1's because they used good quality turbo pistons anyway. The engines were desined to run a high duty cycle in a heavy truck for at least 750K to 1 million KM service life. Even at 15psi I suspect it is hardly raising a sweat.

Water to air is at least 3 to 4 times as efficient as Air to air, but what with the pump, heat exchanger and other bits and bobs led me to use a front mount Air to air for simplicity sake.

JC

Originally Posted by justinc

No oil squirters, mine was an NA engine like yours. IMHO they aren't really necessary, well at least in the late 4BD1's because they used good quality turbo pistons anyway. The engines were desined to run a high duty cycle in a heavy truck for at least 750K to 1 million KM service life. Even at 15psi I suspect it is hardly raising a sweat.

Water to air is at least 3 to 4 times as efficient as Air to air, but what with the pump, heat exchanger and other bits and bobs led me to use a front mount Air to air for simplicity sake.

JC

Also fitting the barrel over the rocker cover could prove a little troublesome

Originally Posted by Bearman

Those temps are a little high for my liking. I would be fiddling with a little increase in fuel and see if that brings it down. You will know when the fuel is too high as it will smoke. On a hot day with a full load, a trailer, full roof rack, a few passengers, head wind and a long pull up a hill those temps are going to rise considerably. I would be trying to get them down at least 100 lower than they are. A snorkel will also help with bringing cooler air into the turbo and i would hook up the turbo cooling water. Turbine temps of 450 - 600 are going to transfer some heat throught the barrel to the compressor side increasing the charge temps, however if the cooling water temp in the barrel area is 80 odd degrees (engine temp) it is going to dissipate some of the heat there instead of going through to the compressor side. This will also prolong your oil life.

I also run 400-450C at 100km/h. To be honest I'd be questioning the accuracy of any measurements recording lower temps at that load. Unless of course they were geared much lower.

Reducing the max fuel delivery will have absolutely no impact on EGT's at cruise. The only way to reduce cruise EGT's are making sure you have a good cool intake position and reducing vehicle load.

Increasing the fuel loadings as Bearman suggests will increase EGT's at full power and have no effect on cruise. This is not a petrol engine, you cannot tune it like one.

Turbo water cooling is for hot-shutdown protection on petrol engines, it does nothing while the engine is running. The housing is cooled by engine oil when running, there is no significant heat transfer across a turbo core.

Originally Posted by Dougal

I also run 400-450C at 100km/h. To be honest I'd be questioning the accuracy of any measurements recording lower temps at that load. Unless of course they were geared much lower.

Reducing the max fuel delivery will have absolutely no impact on EGT's at cruise. The only way to reduce cruise EGT's are making sure you have a good cool intake position and reducing vehicle load.

Increasing the fuel loadings as Bearman suggests will increase EGT's at full power and have no effect on cruise. This is not a petrol engine, you cannot tune it like one.

Turbo water cooling is for hot-shutdown protection on petrol engines, it does nothing while the engine is running. The housing is cooled by engine oil when running, there is no significant heat transfer across a turbo core.

Well it did on mine....if you mean adjusting the main fuel screw on my NA pump, that has effected all my EGT across the board

JC

Originally Posted by justinc

Well it did on mine....if you mean adjusting the main fuel screw on my NA pump, that has effected all my EGT across the board

JC

Was that the only change you made?
I have changed my max fuel setting several times, cruise EGT's haven't moved beyond the normal variation.

Because it takes X amount of fuel injected per bang to push your vehicle down the road at Y km/h. As long as the pump can deliver the volume required, it will deliver that volume and that dictates your EGT's.

If you'd changed the timing, boost, intercooling or intake then that would have an impact on EGT's. Likewise external vehicle mods (tyres, tyre pressure, roofrack etc).

Originally Posted by rovercare

Also fitting the barrel over the rocker cover could prove a little troublesome

I may fit a bonnet from a puma, or make a hump. you don't need to run it over the top either, I know there is not heaps of room but where there's a will there's a way.

At 100k on the flat I am sitting at about 5psi boost,how dose this compare.


As dougle has mentioned different loads and engine speeds I think my egt's would naturaly be high than the rangie set ups and standard countys. The intake at the moment is also from the back of the engine bay as I have not fitted a snorkel yet.

I think I will be getting the over drive unit when they come out would be nice to drop some revs.

I have just done my first long trip with the new engine and I am happy. the fuel savings are great and with a combination of highway and town driving I have returned 13.12lts per 100km so much better than the v8. My max egt temp flat out up a long steep hill was 670, and sitting on the high at 105km into a slight head wind was between 450 to 510.

now this seems high to some of the posts on here but the exhaust emissions seem perfect, I called my mate in darwin and he has just turboed his patrol and he is running same boost pressures and same egt's at the 100k mark.

So I am still a little convused as to what to do, I turned the screw out 1 turn and it went ok but not great and temps where still ok I thought so I turned it up to 1.75 turns and it went alot better but did have some exhaust emissions when the throttle was planted with no boost and still the temp was what I thought was ok, then I posted my run on here and I turned it down to 1.25 turns as the consencess was it was to hot.

so I surpose what is considered to be to hot for an extended period.

Hi Lamby, You say it went better with the fuel increased but had exhaust emissions at low speed with little boost. It is normal to have some black smoke at low boost unless you have a turbo fuel injector pump. They have a boost compensator that reduces the fuel at low boost. As long as it doesnt smoke at highway revs, I wouldnt be too concerned with smoke at zero boost. The main thing is the EGT's. Was there any difference in them.
The engine specs for the turbo motor states that the max temp is 750 measured at the turbo intake so you are still below that......Brian