Wizard
hey guys
recently i snapped my turbine wheel off my GT2052s (found on td5 discoverys) main reason being it is an incorrectly matched turbo to the isuzu and also due to me pushing the poor thing to hard
as posted in isuzurovers thread on turbos's i said i was fitting a TB28 which i have just done and found some things that i found very interesting.
After turning the fuel up and then getting a few little things done to the pump on the test bench it was running fine with the GT2052s apart from at idle it idled smooth but seemed like it was choking it just did not seem right (before and after any adjustments to pump).
I then just started the engine with the TB28 exhaust A/R of 0.67 and it started much smoother and with much less noise and the motor sounded smooth and like a diesel should which made me come to the conclusion the GT2052s is not an appropriate choice at all this is also shown with Bush65's and Dougals numerous posts over the years about turbo selection and sizing and numerous graphs.
This turbo i put on unfortunately is leaking oil out the seals on the compressor side and after fidiling with it for awhile i got further and further behind and is probably looking at a rebuild which i cannot warrant spending the money on because it was a turbo that was on a truck that was burnt and probably has more internal problems than first thought
What i am looking at now is my options on what to spend my money on
my thoughts were:
1.twin turbo (compound setup) such as 2 others have been tinkering with and if so what size turbos are going to be suitable to match to each other? and also what brands are the best choice Turbonetics,Borgwarner,Holset,IHI or Garrett...
or
2.a hybrid turbo such as what def90 has a super Ct26 or something along those lines.
or
3. or if theres an off the shelf size turbo that will do what i am looking for. such as some i have seen are gt30's that have an option of a 0.63A/R exhaust housing which is smaller than the gt25's that some are using
Righteo the purpose of this truck is not for holidays,not for camping,not for daily driving but more of a weekend play truck and experiment which is why i am searching for higher than usual performance levels.
TopicToaster
SubscriberIf you want something to fiddle with, then throw on a VNT like the one Rovercare is running, and a decent intercooler. Pulls like a train from idle, and more boost than a standard pump can provide fuel for.
If you're still not happy you can also upgrade your pump and get an even bigger I/C...
How high a performance level are you looking for? Do you want to be able to spin all 4 on the tar??
Steve
Wizard
Im still weary about the vnt's after hearing some bad things about them but then again every new diesel uses them so mmm
as for pump after mod in 3rd 4th and 5th there was a constant jet of black smoke even with intercooled 30psi (granted the flow wouldnt have been great due to size of turbo)
im looking at achieving rediculous amounts of power as stupid as that sounds but i dont care about fuel economy at all.
Weird thing i found was that when i had everything running good i could plant it in any gear and it was scary and that was said by a owner of a ls1 holden ownerit also sounded like it was bouncing on and off the governor flat out if the foot was planted flat
...
So all up im looking at gaining even more stupid power.
ChatterBox
SupporterDont bother with the turbo Matt, just chuck on a hiclone and your all good
OldBushie
If I get time to ever play with mine, I'm just gonna yank it and fit a 6bd1, they are cheap as chips
What have you had done to the pump?
TopicToaster
30 psi is still 30 psi, if you were not able to flow enough air then you would not raise 30 psi. I don't believe this is a high pressure low flow situation, ultimately the flow is restricted by the engine. A bigger turbo set up will need to raise the pressure above 30 psi to flow any more air. I'd expect that you will get more efficiency through a compound turbo setup so the air charge may be a bit cooler when it enters the engine.Originally Posted by c.h.i.e.f
Im still weary about the vnt's after hearing some bad things about them but then again every new diesel uses them so mmm
as for pump after mod in 3rd 4th and 5th there was a constant jet of black smoke even with intercooled 30psi (granted the flow wouldnt have been great due to size of turbo)
im looking at achieving rediculous amounts of power as stupid as that sounds but i dont care about fuel economy at all.
Weird thing i found was that when i had everything running good i could plant it in any gear and it was scary and that was said by a owner of a ls1 holden owner
...
So all up im looking at gaining even more stupid power.
Master
Will it fit?
6BD1 is a big engine, one of my customers has one in an FSR beaver tail
OldBushie
Grinders, welders, plasma cutter, everything fits
County/defender body's are already a pressed tin/al thing, easy to molest
ForumSage
Turbos spitting oil are usually caused by drain issues. Where is your turbo drain going to? You can try a restrictor in the oil feed to reduce the pressure inside the turbo too.
I'm currently battling the same issue (it's happy hour, my turbo is feeding my engine all the oil it can drink and then some. 1 litre gone in 20km). Turbo drain (factory) is completely clear, crankcase pressure is too low to register (thanks to provent and 1" lines), turbo seals and bushings are good too.
Time to rip it off again today and look for oil drain issues inside the turbo.
But anyway.
If you want to fit a compound set, you need to start with a turbo that works satisfactorily as a single and has a strong enough shaft to handle being fed air at 50%-100% higher density than atmosphere. So finding a good single is still the first step. The second step is finding a big turbo that will cover the flow requirements and still fit under the bonnet.
If you want a VNT then a GT2256V is the smallest you want to fit.
Black smoke when you've got that much air might mean your injectors are jetting fuel into the pistons or other cooler surfaces where it can't burn. Did the injection shop tell you the cc/1000 strokes your pump is putting out? The 9mm pumps used on the US 4BD1T's are burning clean with mid 20's for boost and good intercooling. This is around the 200hp and 600Nm mark. One pump was benchmarked around 140cc/1000 shots.
What gearbox have you got?
Wizard
Haha molest lol you would have to position the motor towards the centre of the car more to dustribute the weight i would suspect....
Mick thats a perfect idea haha
True slug burner i suppose 30psi is 30psi the efficiency wasnt great and the compressror temps were not ideal.
The pump was setup on the machine and im not sure how it was done but max fuel was opened up another 25% over standard max setting plus we ground the torque cam to a profile that is way more even. it was alot of mucking around trying to get it in the correct spot then internal idle was set.
The discusting thing was the fuel delivery curve for the 4bd1ts is discusting im asuming it was to try and stop polution in lower revs.
Unfortunately the thing i wanted to do with the pump could not be done because i wanted to get larger elements than 9.5mm but it would have meant changing the frame from a "c" to an AD (i think unless ive been fed crap because i swear dougal is running 10.5mm ones) the main problem was trying to get hold of plungers and barrels because noone would talk about it and bosch australia was VERY rude and told numerous lies such as "it wont do anything you must change your cam plate so stop trying to change things you people that play with diesel dont know anything its ment for us and us only" funny thing he was reffering to a rotary pump and not a inline the idiot
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