Turbo for 2H

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marting said:
Hmmm.. what would be the disadvantages of having a turbo that is a bit to big? To much boost? Only boost at high revs.?
Click to expand...

It'll give less boost in the low and mid range but will give more top-end power. Yes it's another compromise.

If you disable the wastegate, a smaller turbo will give you higher boost than a big turbo.
 
I see.. well i'm not really after to much top end power.. would be nice to have full boost at ,say 1500, and still be able to cruise at 2400rpm without too much boost..


This choice is proving difficult.:p.I have found GT2560R's that you recommended but they are a bit expensive,,:o (I'm cheap)
I thought this one had pretty much the same specs.

I'll keep looking around..
 
marting said:
I see.. well i'm not really after to much top end power.. would be nice to have full boost at ,say 1500, and still be able to cruise at 2400rpm without too much boost..


This choice is proving difficult.:p.I have found GT2560R's that you recommended but they are a bit expensive,,:o (I'm cheap)
I thought this one had pretty much the same specs.

I'll keep looking around..
Click to expand...

A similar turbo to that one but with a slightly smaller exhaust housing will work fine.
How much boost you use at cruise depends on engine load, my vehicle runs 9psi boost when cruising at 100km/h, the EGT's run around 430 deg C upstream of the turbo in this situation. But planting my right foot delivers 20psi at that rpm.

Unlike a petrol engine, boost at cruise doesn't hurt fuel economy on a diesel, it actually helps a little.
 
Dougal said:
A similar turbo to that one but with a slightly smaller exhaust housing will work fine.
How much boost you use at cruise depends on engine load, my vehicle runs 9psi boost when cruising at 100km/h, the EGT's run around 430 deg C upstream of the turbo in this situation. But planting my right foot delivers 20psi at that rpm.

Unlike a petrol engine, boost at cruise doesn't hurt fuel economy on a diesel, it actually helps a little.
Click to expand...

How many different exhaust housing sizes is there? I can find t3/t4 with A/R 50.. really cheap on e-bay:grinpimp:
 
marting said:
How many different exhaust housing sizes is there? I can find t3/t4 with A/R 50.. really cheap on e-bay:grinpimp:
Click to expand...

The size sounds good, I can't vouch for the quality.:cheers:
 
THE SEARCH IS OVER!

I have bought a turbo.. Garrett/Nissan... was supposed to be sort of in between a GT25 and a T3.
From a singel-turbo 300zx

I honestly dont know A/R figures and stuff... It looks big enough. Hopefully not too big.:hhmm: The guy i bought it from sells lots of turboes and has tried "everything" so i followed his recommandations (an enthusiast not a vender)
Lets hope it does the trick!
It's oil and water-cooled.
I got a XS pop-off valve too.:bounce::bounce::bounce::bounce:
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marting said:
THE SEARCH IS OVER!

I have bought a turbo.. Garrett/Nissan... was supposed to be sort of in between a GT25 and a T3.
From a singel-turbo 300zx

I honestly dont know A/R figures and stuff... It looks big enough. Hopefully not too big.:hhmm: The guy i bought it from sells lots of turboes and has tried "everything" so i followed his recommandations (an enthusiast not a vender)
Lets hope it does the trick!
It's oil and water-cooled.
I got a XS pop-off valve too.:bounce::bounce::bounce::bounce:
Click to expand...

I hate to put a damper on your enthusiasm, but I had one of those turbos and sold it. They're not suitable for diesel use as they can't produce boost at low flow without surging.
It's called a T25G.

The compressor wheel has a very high trim (intake diameter is very close to the overall wheel diameter) which allows the boost to surge back through it when you try to get high boost at the rpm that diesel engines run. This surge over time damages the compressor blades, when they fail they head into your engine.
The T25 I'm currently running is a 60 trim which has a 40mm intake, that one is 74 trim which has a 44mm intake.
 
marting said:
:doh:....hehe.. damn!

So are you saying it's a NO-GO?

I'm sure i could swap it for something else...It sort of feels like you know what you are talking about Dougal..

:bang:
Click to expand...

Yes it's a no go. But on the bright side, you should find plenty of ricers who'll be happy to swap a normal T25 for the T25G.
They're rumoured to flow more than a T28, but I haven't found any compressor maps for them.
 
marting said:
Yeah.. we'll see.. I will have to talk to the guy I bought it from.. I asume he will let me cancel the buy if I want to.

Well... F##K!:censor:

:lol:

The search continues. I'm getting confused with all the numbers and sizes..:rolleyes: What about this then?
eBay Motors: T25/T28 TD04-H TURBO CHARGER INTERNAL WG +FLANGE SET (item 380040192552 end time Jun-30-08 15:01:34 PDT)
Click to expand...

Well on second thoughts, if you only want to run low boost (like single figures in psi) then the T25G will most likely cope well. I was planning to run 15-20psi which is why it was very unsuitable.

That Ebay one is what you're looking for. Similar exhaust turbine to the T25G, but a bigger compressor wheel with a smaller trim.
 
I will run below 10 psi. Like an original 12HT i guess..
I just talked to the guy, and he also said that it would be no problem with low boost..And that he sold it to me because i said i would run low boost..wich i did..:rolleyes:.
The wastegate-spring feels pretty soft so he said it's probably set somwhere around 8 or 9 psi.

I'm keeping it.

:meh:
 
marting said:
Yeah.. we'll see.. I will have to talk to the guy I bought it from.. I asume he will let me cancel the buy if I want to.

Well... F##K!:censor:

:lol:

The search continues. I'm getting confused with all the numbers and sizes..:rolleyes: What about this then?
eBay Motors: T25/T28 TD04-H TURBO CHARGER INTERNAL WG +FLANGE SET (item 380040192552 end time Jun-30-08 15:01:34 PDT)
Click to expand...

Well on second thoughts, if you only want to run low boost (like single figures in psi) then the T25G will most likely cope well. I was planning to run 15-20psi which is why it was very unsuitable.

That Ebay one is what you're looking for. Similar exhaust turbine to the T25G, but a bigger compressor wheel with a smaller trim.
 
It looks like the center-part of the turbo can be rotated.

Is there a particular way it shold sit? I'm thinking about oil lines an stuff..Since the oil-feed goes through a small hole and the return is much bigger, should the return point upwards so the whole "chamber" is full of oil?
I't looks as if I mount it the other way around, oil will just run right through without even touching the axle?
 
marting said:
It looks like the center-part of the turbo can be rotated.

Is there a particular way it shold sit? I'm thinking about oil lines an stuff..Since the oil-feed goes through a small hole and the return is much bigger, should the return point upwards so the whole "chamber" is full of oil?
I't looks as if I mount it the other way around, oil will just run right through without even touching the axle?
Click to expand...

You need to rotate it (some call it "clocking") so the oil inlet is at the top and drain vertically below it.
Turbos use labyrinth seals to keep the oil in, they will leak oil into the inlet and exhaust (making lots of blue smoke) if the oil can't drain out easily.

The oil in the top port will be spread along the shaft and to the journal bearings, from there the whole centre section is open to drain out the hole in the bottom.
 
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