82 HJ60 2H Turbo - A few Questions

[ASHHJ60]

G'day all from a new bloke who is making his first post!

I have recently bought myself a 82 HJ60 Lancruiser, has the 2H diesel with an aftermarket Turbo kit on it. But there are a few things that don't add up. For starters the accelerator butterfly and venturi is setup before the turbo, now I am not a turbo expert, but in "normal" not WOT circumstances wouldn't this block decent airflow to the trurbo and prevent it from making boost? Wouldn't it also create a vacume inside of the turbo and possibly pull oil back through the turbo seals? The reason I ask this is because the turbo does not make boost untill 2500RPM 3-4PSI and then will only do this when you are driving it flat foot, push the revs even further and the boost creeps up to 5PSI @ 3000RPM and then tops ot at 9 at 3800-4000RPM, Not the way I would like to drive my 2H. Also if this is setup incorrect would it cause a loss of power? See the pic's attached.

I am planning to move the butterfly back to it's orginal position after the turbo. One would assume that everything would still work OK?

I will greatly appreciate any ideas/help folk on this forum can provide. Look forward to hearing from you all shortly.

 

[ozwallaby]

From what you've said, it seems the turbo is waaaay too big. If you're at WOT, even with the butterfly in that odd position, you should be making better boost than that. It could also have a badly warn turbocharger.

If you can post all the numbers on the turbo, somebody on here may be able to give you an idea of what the turbo came off and whether it is compatable with your 2h.

I think your butterfly position is more common on steady state settups like gen sets that basically run at a fixed rpm. As you said, I think changing back to the "normal" position for the butterfly is a good idea.

 

[Jan-78FJ40]

I agree that this does not make sense, but I could be missing something. None of the commercial 2H turbos have this setup. as you said, you are restricting the airflow.
cheers,
J

 

[marting]

Wow!

I actually debated about this thing with a few guys when making my "turbokit"... I expected problems with the vacuum-lines that go to the injection-pump..And concidered moving the entire throttle-housing to pre-turbo

Ended up just leaving it all like stock.. works perfectly.

You can put everything back where it belongs..

Your setup means the throttle-linkage/cable has been rerouted,
I asume you have checked that a flat pedal actually opens the butterfly completely?

Also check if the vacuum-hoses are connected correctly, they might have messed things up..

Sure you have no air-leaks in the preasurre-pipes?

Have you tried giving it some more diesel? Makes more exhaust!

And yeah... turbo looks a bit big...but looks aren't all..(objects in the rear wiew..etc etc)... But that might be the problem i guess
Check out my "turbo-journey" here: https://forum.ih8mud.com/diesel-tech-24-volts-systems/225695-turbo-2h.html

 

[ASHHJ60]

Thanks Fellas for your comments already. All this, kind of confirms my original thoughts that there where two possible problems. Turbo being to big and the throttle in the wrong place. I have ordered an orignal throttle body from a 4x4 wrecker, and should have that by sometime next week. I'll rerout all the pipes, tidy it up, and then see if there are any changes in drivability etc.

Just some more technical info for you all though, The Turbo has only these markings on it;

The exhaust side of the turbo has 6201800-11a A/R 1.60
Now if I remember correctly, didn't someone here mention A/R in the size of around .45? If that is so, this Turbo is miles out....

The Compressor side of the Turbo has the number 1081.

The Car is running a 4 speed, with a fairly (Is that it?) over drive and all other orginal equipment. It has also has a "Home made" Snorkel fitted to it, which seems pretty air tight. I checked my blow by the other day, and there is hardly a puff of air coming out of that, and no blue smoke while running, only a small amount after long periods of idle and startup. Could that be turbo seals or buggered Valve stem seals? Oh yeah, I also replaced my Injector pump Diaphram and all filters etc as well and ran through a couple of bottles of Nulon injector cleaner. I have also checked and presureised (Off the car of course) the vacume lines (no leaks) and resealed most of the joins from the turbo through. I haven't done a compression test though, thats on my list. The ol girl blows a little (Very little) black smoke on acceleration but thats about it. I am thinking about fitting a EGT guage to it as well for extra safety.

I would like to think I am pretty thourough in checking these things but If I've missed anything feel free to let me know.

 

[Tapage]

I'm runiing 14 PSI with a ( sure ) much smaller turbo, in a stock throtle configured 2H .. first bet, it's the size of your selected turbo ..

 

[ASHHJ60]

Thanks Tapage,

I had a feeling that it was that, and has now been confirmed as I reconfigured it all back to factory this weekend just gone. Seems to have more power down low now but still only pumps in 5PSI boost at 2500RPM and continues up as Revs increase. I'd be happy with 9 PSI accross the rev range..... Oh yeah turned the fuel up 1/2 a turn as well, made heaps of smoke at 2500RPM so cranked that back when I got home.

Now just to find the right sized turbo........

Thanks for all your help.

 

[marting]

Sounds like the fuel already had been adjusted then.. Good luck on finding a suitable turbo... Mine gives 8 psi from 1800rpm and has exhaust a/r of .70 i think... .60 would be spot on i guess..

 

[Tapage]

Mine it's pretty small .. .38 AR and seen 5 -6 PSI @ 1600 rpm and 14 PSI at max 2800 rpm ..