New Turbo Questions

[Matt_85Lux]

I'm looking at getting a new turbo for the Hilux (2.4D) and not sure what to get specification wise. I'm looking at 2 different ones at the moment but as my experience in this area is lacking I'm not sure which one would be my best option. I would like the boost to come on fairly low in the rev range, say around 1500-2000rpm and be able to hold till about 3500-4000rpm. Any help would be great

here the specs on the 2 I'm looking at

Turbo 1.
Cooling type: Oil & water
Waste gate PSI: 10
Journal Bearing: Wet Float
Inlet Diameter: 3”

Compressor Wheel
A/R: 0.6 Cold Side || Ind: 54 mm || Exd: 70 mm || Trim: 60

Turbiner Wheel
A/R:0.64 || Ind: 52.9 mm || Exd: 45.47 mm || Garrett 4 Bolt T25 Flange

Turbo 2
Cooling type: Oil & water
Waste gate PSI: 10
Journal Bearing: Wet Float

Compressor Wheel
A/R: 0.6 Cold Side || Ind: 42.50 mm || Exd: 60 mm || Trim: 50

Turbiner Wheel
A/R:0.49 || Ind: 52.9 mm || Exd: 45.47 mm || Garrett 4 Bolt T25 Flange

[ISUZUROVER]

If I was buying a new turbo I would be going VNT (variable vane) for sure.

A VNT2256 should be about the right size.

[anzac]

the second one will spool earlier.

BUT, journal bearings? You could use a larger ball bearing turbo and still get same early boost but far better turbo.

They are more expensive but worlds ahead in performance

I do a GT2554R for $1750 including oil and water lines. I also do a dump pipe to suit for $330.

uses the larger exhaust housing .64 and a much bigger compressor side .8. With the advantages of ball bearing, it'll still boost early but flows much more air.

I also have a few options for inlet flanges etc that may suit you better.

PM me if you want more details

[Matt_85Lux]

I would go a ball bearing turbo if it was within my budget but sadly I can't stretch it that far. So the second one would be better for boost earlier in the rev range. When would it start to boost roughly and what sort of rev range would it be working in rougly?

[KiwiBacon]

Honestly both are too big for that engine.
Your 2.4 at 10psi boost and 4000rpm only draws 17 lb/min of airflow. Even the smaller turbo you've got there will do about double that (~33 lb/min for a 60mm T28).

A garrett GT1548 will pump all the air you need and spool up way quicker than either of those will.
If you want to save some bucks, pick up a used T25. If you want the best performance try to find a GT1749V variable vane turbo. I'm not sure how common they are in Aus but virtually all 1.8-2.2L modern car diesels use them.

[Matt_85Lux]

specs for a T25 (S13 silvia) are as follows

Compressor: T-25, 60 trim 56mm 0.60 A/R BCI-1 compressor.
Turbine: T-25, 62 trim 53.8mm 0.64 A/R turbine housing.

which seem similer to the 1st turbo I'm looking at, so maybe lean towrds that one?

[Clanky]

That T25 off the Sylvia is the same as the standard Nissan GQ 2.8 turbos
They are cheap and plentiful
Be aware there are new Chinese copies on the market, so make sure you get what you pay for

[KiwiBacon]

specs for a T25 (S13 silvia) are as follows

Compressor: T-25, 60 trim 56mm 0.60 A/R BCI-1 compressor.
Turbine: T-25, 62 trim 53.8mm 0.64 A/R turbine housing.

which seem similer to the 1st turbo I'm looking at, so maybe lean towrds that one?

Which engine is that? I've found a lot of T25 specs on the net and very few of them are correct. Here are some of my specs, from turbos which I've stripped and measured.

T25 from a CA18DET bluebird.
TH 1456J
14411-96f11 - Nissan Part #
455767-0003 - Garrett Part #
51.3mm/40mm cold, 60 trim 0.48 A/R cold
53mm/42mm hot, 63 trim, 0.49 A/R hot

T25G - I think fitted to the early SR20DET, but unconfirmed
51.3mm/44mm cold 74 Trim 0.80 A/R
53mm/42mm hot, 63 trim, 0.64 A/R hot

I also have a selection of T25 and T28 parts and have yet to see a 56mm compressor or a 0.6 A/R compressor housing. The 98- W11 turbo avenir has a GT2554R with a 54mm compressor wheel. The rest are either 51-52mm T25 or 60mm T28 compressor wheels.

[Matt_85Lux]

specs for a T25 (S13 silvia) are as follows

Compressor: T-25, 60 trim 56mm 0.60 A/R BCI-1 compressor.
Turbine: T-25, 62 trim 53.8mm 0.64 A/R turbine housing.

which seem similer to the 1st turbo I'm looking at, so maybe lean towrds that one?

Which engine is that? I've found a lot of T25 specs on the net and very few of them are correct. Here are some of my specs, from turbos which I've stripped and measured.

SR20, apparantly they also had the 0.8A/R compressor as well

[KiwiBacon]

SR20, apparantly they also had the 0.8A/R compressor as well

I've had two of those. They're the T25G, same turbine as the smaller T25 but a bigger trim compressor wheel (same 51.3mm OD, but bigger intake), bigger compressor A/R (0.8 vs 0.48) and bigger exhaust housing (0.64 vs 0.49).

For the 2.4, I'd suggest the small T25. Going bigger is just going to lose more and more low end boost.

[Matt_85Lux]

What sort of A/R and Trim should I be aiming for?

[spazbot]

if your putting it on a hilux 2.4D why not just but a ex jap kit from a wreckers to suit a 2.4 when i got one for my 2.8 it cost around $800

[KiwiBacon]

What sort of A/R and Trim should I be aiming for?

T25 with 0.49 exhaust A/R will be okay, they come with a 0.48 compressor A/R.
The compressor A/R isn't important by itself, it's more used to identify which compressor wheel is inside.

I've got drawings for a CT20-T25 adapter plate somewhere.

[Matt_85Lux]

if your putting it on a hilux 2.4D why not just but a ex jap kit from a wreckers to suit a 2.4 when i got one for my 2.8 it cost around $800

Already have a kit on my lux but the seals in the turbo are on the way out and would rather buy a new turbo then get a second hand one