43 replies to this topic

[Jimbo]

Nah, B4 VF33 uses a larger inducer and is the only TT turbo that does. VF31 has a smaller inducer and wont fit on your intake tract.

You may be able to make a hybrid out of a VF25 or 26 using the compressor cover of the VF33. Unsure, some of the other TT gurus may be able to shed some light. Occasionaly a VF33/32 set will pop up on Import Monster.

[PeeKay]

IHI VF 32 (Secondary)
IHI VF 33 (Primary)

RHF4 Family

PRIMARY
Manufacturer IHI
Turbocharger Type VF 33
Turbine Blade no. 9
Compressor Blade no. 6 + 6
Turbine Rotor Size 46.5mm / 35.4mm
Compressor Rotor Size 47mm / 35.4mm
Max. Turbine Speed 190000 rpm
Wastegate Port Diaphragm 17mm
Wastegate Open Press. 78 kPa
Intercept Point 1900rpm @ 760mmHg
A/R Ratio 11
Bearing Type Floating Metal


SECONDARY
Manufacturer IHI
Turbocharger Type VF32
Turbine Blade no. 9
Compressor Blade no. 10
Turbine Rotor Size 46.5mm / 35.4mm
Compressor Rotor Size 52.5mm / 36.6mm
Max. Turbine Speed 180000RPM
Wastegate Open Press. N/A
Intercept Point N/A
A/R Ratio 18
Bearing Type Floating Metal

Sorry for digging this up but according to the above what is the efficient boost pressure for the 33/32?

[duncanm]

well - looking at that map, and assuming the lines are per usual, surge to the left, highly inefficient to the right, then you want to operate in about the top right 2/3 (X and Y axis) - ie: around 1.25bar or less and 6m^3/min (each turbo).

 

according to this: https://www.rbracing.../calcboost.html, that should flow about 300hp - which sounds a little low.

 

oh - and you could probably run more like 1.5bar at lower rpm (flow). Table says max 1.7bar