[Nutron]

24 psi (1.66bar) on over boost but they settle at 22psi (1.52 bar) usually .
28psi is a hell of alot for a standard turbo and will be chewing through your thrust bearing.
52mm hybrids struggle to get 26psi above 4000rpm, so the standard 49mm will be superheating the boost charge at the pressures you are getting.

 

[Nutron]

28psi on a standard GT1749MV is going to kill it.

 

[Nutron]

A 56mm cover from what turbo? It seems highly unlikely they stuck a 56mm comp wheel cover on a 52mm wheel as there would be a big gap between compressor and housing, resulting in poor performance. 1.8 bar (26psi) from a 52mm unit is quite acceptable.

 

[Nutron]

Missing:
Does it say GT before the 2056? It should be a 56 cover if that is stamped on it but where did you get the turbo from? Did you get that mapped down at courtenays? Lots of questions

I have three hybrids in the garage and two standard units dismantled ready to hybrid, so I shall try to remember to measure the turbine tomorrow night.

 

[Nutron]

Yes, the one they gave up on because it did not give the results they wanted. They must have done something wronge somewhere as the smallest 56 I use, which is in a standard cover milled out has made 246bhp on mine. I think EDS had them made up in Germany.

The details I have in my logs suggests my turbine is

Inducer 43
Exducer 38
Tip height 7.2
Journal bearing 7.88
Compressor wheel bore 5.08
Straight shaft

I will have to check and measure the tip height.

 

[Nutron]

Ah yes, RS did the map, I'm getting old and I forget things. I am sure EDS had 52mm units made as I was following with much interest at the time.

The inducer on the turbine is always bigger as the inducer is the primary driver.

 

[Nutron]

Clarify what? Look up some pictures of turbine and compressors in google.

The air flows into the compressor inducer, is accelerated down and compressed as it moves into the exducer, where it is further compressed and accelerated radially outwards into the cover plate and is slowed again to increase pressure.

The air flows into the turbine inducer at an angle and speed controlled but the VNT mechanisum. The air drives the turbine inducer like a water wheel and flows down into the exducer, where it acts more like a aerofoil.

 

[Nutron]

Lol

Have to be clear about what you want

I did not get round to measuring last night as I was working until 21:30 but I will shortly

 

[Nutron]

The dimensions from above seem to be right and the total height is about 21.5mm

 

[Nutron]

I machined a turbine housing and made up a GT2556 from mine, it didn't spool until near on 3000rpm lol
The current trimmed turbine unit I have seems to be performing well and with a simular spool threshold, that would be easier.

 

[Nutron]

Not surprised.
Get it out and have the bearings swapped before it pops.
I can recommend some where if you need.

 

[Nutron]

Be carefull buying cheap chinese comp wheels, they balance them with lead, which and come out in operation and throw the balance, resulting in destruction.

 

[Nutron]

I'll PM you because I don't want to openly disparage anyone today.

 

[Nutron]

Nope, not in open forum as I said but if you are desperate to know then PM me too.

 

[Nutron]

Disparage, I missed the 'a' at the end because I was rushing.
To speak of someone or something as if it has little or no value.

 

[Nutron]

Take off the intake and/or the exhaust and feel for play in the shaft.