Turbo for low/med performance, GT2052 or CT26(12HT)

[Chris Wilcox]

I've searched and found lots of GT2052 on 3B and one CT26 on a 2H that produced 10lb boost at 1900 rpm. I've also found claims the opposite of that CT26 performance.
I'm looking for low to medium performance on my non-turbo 2H and am wondering if the GT2052 is too small. Should I just source a 12HT spec CT26?

I've also educated myself on turbos by reading a few books and the garrett website plus found the squirrel calculator. I mostly understand the theory and curves but have no experience so am asking for opinions from those with experience and knowledge.

My goals, 8-9psi boost serving the low/medium rpm performance. Top end power is of no concern and I would think 30-35% extra power would be great.

There is also a volvo 740 turbo that has been mentioned but I haven't been able to determine specs. Info on that would be helpful too.

Thanks,
Chris

 

[blis]

I've searched and found lots of GT2052 on 3B and one CT26 on a 2H that produced 10lb boost at 1900 rpm. I've also found claims the opposite of that CT26 performance.
I'm looking for low to medium performance on my non-turbo 2H and am wondering if the GT2052 is too small. Should I just source a 12HT spec CT26?

I've also educated myself on turbos by reading a few books and the garrett website plus found the squirrel calculator. I mostly understand the theory and curves but have no experience so am asking for opinions from those with experience and knowledge.

Thanks,
Chris

If I had the money I would definitely get a Gturbo (by gbentik)...

 

[Chris Wilcox]

I saw a thread on this. What are the specs on it again or a reference thread.
Chris

 

[gerg]

The volvo 740 turbo you mention that would suit your needs is a t3 50 trim I believe with a .48 exhaust. If you know squirl well the map is on there. It will go off the map I think at 3000rpm at 15 or so lbs for you, but would spool well in the lower rpms. However, it is an old design (circa 1970's) and not nearly as effecient as newer (1990-2000's) turbos. Graeme's turbos hold all the latest tricks short of holset extended tip technology as far as I know.

Graeme's turbos are most likely the best match you will find short of a VNT turbo. There are alot of other turbos that will work to varying degrees as well, it all comes down to your budget.

Here is a link for a good read
https://forum.ih8mud.com/diesel-tec...5371-gbentink-turbo-upgrade-users-thread.html

 

[ForealBoreal]

anyone know how hard it is to come by a 12h-t manifold?

 

[ukaviator]

I just put a Gturbo on my 1HDFT and am very happy with the performance gains.
As a result I have the stock turbo off my 1HDFT motor if your interested. It's a CT26

 

[Dougal]

The 2052 is too small for a 12HT. Talk to Graeme about his Gturbos.

CT26 is a turbo family, so you'll get a massive spread of results depending on which CT26 and what it was originally fitted to.

 

[Chris Wilcox]

I would be after a 12HT CT26 only.
Chris

 

[Tapage]

The 2052 is too small for a 12HT.

ain't the OP planning that turbo on 2H ..? still small .. anyhow ..

 

[Dougal]

ain't the OP planning that turbo on 2H ..? still small .. anyhow ..

Yeah still too small.
The GT2052 is physically smaller than a T25.

 

[Chris Wilcox]

I trust your judgement and am glad I asked since the garrett boost advisor program on their website proposes the GT2052(1) as one of three candidates.

Maybe you can tell me if my assumptions are reasonable for a 2H
INPUTS:
145 HP
3.98L
Single turbo
Diesel
22:1
0.38 BSFC
2 valves per cylinder
VE = 0.85
Mid range rpm = 2400 (what my gearing/tires is at highway cruise)
Peak power = 3500 (what I think the 2H peak power occurs at)
Intercooler = none
pressure drop = 1 psi
Effectivness = 0.0
Barometric Pressure = 14.7 (I'm at 60-80 ft above sea level)
Ambient air = 20 celsius (reasonable summer temperature here)
OUTPUTS:
-----------------------------Mid----Peak
Crank Power HP--------- 98 ---- 144
Boost psig---------------- 7.75 -- 7.75
Press Ratio--------------- 1.60--- 1.60
Intake Temp F----------- 171---- 171
Airflow lb/min------------ 13.79 --20.12
Crank Torque ft-lb------ 216----- 216

Recommended Turbochargers from Boost Advisor:
GT2052(3) - 52.0mm, 50 Trim, 0.51 A/R
GT2052(1) - 52.2mm, 52 Trim, 0.51 A/R
GT2056 - 56mm, 55 Trim, 0.53 A/R

 

[Tapage]

around .48 to .50 hot side AR sound about right .. but then we need to take a look on the cold side ..

 

[Chris Wilcox]

More information from Garrett site

Turbo ---------- Compressor --- Compressor -- Comp --- Comp --- Turbine -- Turb -- Turb
GroupName ---- ind diameter -- exd diameter -- Trim ------ A/R ---- diameter - Trim -- A/R ----- HP -- Displacement

GT2052 (1) ------- 37.60 ---------- 52.20 ------- 52 ------ 0.51 ---- 47.00 ----- 72 ---- 50 ---140-230 -- 1.4-2.0
GT2052 (3) ------- 36.10 ---------- 52.20 ------- 50 ------ 0.51 ---- 47.00 ----- 72 ---- 50 -- 140-210 -- 1.4-2.0
GT2056 ----------- 41.50 ---------- 56.00 ------- 55 ------ 0.53 ---- 47.00 ----- 72 ---- 46 -- 140-260 -- 1.4-2.0

I think I like the look of the GT2056, what do you guys think?

 

[Chris Wilcox]

Graphs of GT2052 and GT2056 from Squirrel Performance calculator

 

[Dougal]

The GT2052 would choke at that 8lb boost and 3,500rpm. Which means any altitude or air filter restriction would see you off of the map.

GT2056 is a far better choice. I would also look at the GT22 range.

 

[gerg]

Im not saying to buy an cheesbay turbo, but this combo would work for a 2h. TD05h 16g with a .58 hot side which is a 8cm if I remember. You can also buy 7cm and 6 cm hot sides as well if you want lower rpm boost. TD05hr turbines are inbetween a t25 and a t3 size.

http://www.ebay.ca/itm/TD05-TD05-H-...Parts_Accessories&hash=item43b8970811&vxp=mtr

 

[gbentink]

Gturbo Grunter Stage 1 - orientation for 12HT would be bolt up (to 12HT manifold). 16psi at 1600rpm. A stock 12HT turbo will work well, but no comparison. The Grunter is better than the TD05H with any config for this application - and costs a lot more than the cheesbay one though (guaranteed to be perfect for your job though - no guesswork.....and reliable to 30psi....)

The 2056 has a nice little comp wheel, but is too small on the turbine and too small on exducer to load up a large enough turbine...... Would be nice if turbine was a bit larger, more axial in design and vnt though....

 

[gerg]

Im not trying to say that a journal bearing td05 is better than your turbos Gerame, and certainly not the cheap ebay ones, but for low rpm response and a low boost situation (15ish psi) I think the small turbine would work out alright. I certainly think that turbine is too small for high rpms and high boost. It is an option most people dont consider. I think it is a better choice then the older t3 families lots of people use.

 

[Dougal]

Gturbo Grunter Stage 1 - orientation for 12HT would be bolt up (to 12HT manifold). 16psi at 1600rpm. A stock 12HT turbo will work well, but no comparison. The Grunter is better than the TD05H with any config for this application - and costs a lot more than the cheesbay one though (guaranteed to be perfect for your job though - no guesswork.....and reliable to 30psi....)

The 2056 has a nice little comp wheel, but is too small on the turbine and too small on exducer to load up a large enough turbine...... Would be nice if turbine was a bit larger, more axial in design and vnt though....

So on a turbine, what percentage of the torque is developed at the inducer compared to exducer?
I know if we reduce exducer size, we get higher gas speed and more resolved force, but less torque due to the reduced radius. But is this minor compared to the accelerated flow already turning the outer fins at the inducer?

BTW, may need to talk to you about a 1KZ turbo. We ripped an intake hose on a hilux. Haven't looked at the turbo yet, but one driver thinks power is down.

 

[Chris Wilcox]

I own "Maximum Boost" by Corky Bell and was able to find a copy of the book "Diesel Engine Reference Book" chapter 2 can be found here: https://forum.ih8mud.com/ca-bc-coastal-cruisers/283634-diesel-reference-book.html
Both discuss sizing the turbine, also the garrett website has turbine curves as you know. I can't say they answer your specific question but there is good technical information in there.
I think you said it best in one of the many posts of yours I've read, something to the effect of "you look at comparable turbines used on existing engines and can scale by rpm and displacement if necessary"
However there is discussion on turbine size in the book that indicates that too small is just as bad as too big.
Chris