20 replies to this topic

[tmh983]

I know this has probably been covered before but I've searched and can't find a good answer.
Which set of turbo is bigger or higher flow capacity, adm 32/33 or jdm 26/27?

[Delete This Account]

AUDM 32 and 33.

[Murf B4]

Get em ported if there out!

[Murf B4]

Get em ported if there out!

[tmh983]

How much bigger is the adm turbos over the jdm? Is it worth changing them over? What about a adm primary with a jdm secondary combo? My car (jdm) is slow on the primary but fast on both.

[tmh983]

The turbos on my car are coming off in a couple of weeks for some exhaust mods.

[tmh983]

according to this list: http://www.rexnet.co...rbo-comparison/ the vf26/27 combo is almost 500hp worth of turbo, which doesn't sound right to me. It doesn't have any specs for the aussie turbos tho

[Jimbo]

If you wish to use the B4 primary you will need to modify the intact tract and use the B4 turbo > intercooler hose. Reason being is the B4 VF33 has a bigger intake snout and wont fit on your tract. You will need to take the manifold off and modify the intake to fit. It can be done with the right silicone joiner. What i did was cut the B4 primary turbo tract off and join it to the other tract to fit.

Howver if you can source the whole tract you can use it. I couldnt becuase i had a Gen2.

[Billsy]

I havent measured them. but to me they seem the same size wise...

The difference comes in the wheel design and the 33 has a larger, less restrictive intake so theoretically it can be more efficient..
the turbine housings are also slightly different aswell, which makes the BIGGEST difference between most of the TT turbos out there.

i know what the 26/27 is capable of and i doubt the B4 turbos would be much more than them. but they would probably be better at spooling up earlier.

[zanzarah]

I know this has probably been covered before but I've searched and can't find a good answer.
Which set of turbo is bigger or higher flow capacity, adm 32/33 or jdm 26/27?

The VF26/VF27 combo will 'out flow' the VF33/32.
The VF26/27 run matched wheel sets (comp and turbine).These turbos have the 8 blade high performance turbine wheels (less weight with higher exhaust flow and top end run out)
Comparing primary turbos:
VF26 has larger compressor wheel (37/48mm) than the VF33 (35.6/47mm).
VF26 has P14 turbine A/R compared to the P11 for the VF33 (VF33 will come on boost earlier but will restrict exhaust before the VF26)
VF26 has the lighter less restrictive 6200 or 8 blade turbine wheel compared to the 4600 or 9 blade VF33
Both turbo CHRAs use (high drag) sleeve bearings.
Both turbos use superback,saw tooth design 6/6 compressor wheels designed for high boost applications.
Comparing secondary turbos:
The VF32 uses a straight 10 blade less efficient flatback (36.5/52.5) comp wheel.
The VF27 use (37/48mm) superback,saw tooth design 6/6 compressor wheels designed for high boost applications
VF27 has the lighter less restrictive 6200 or 8 blade turbine wheel compared to the 4600 or 9 blade VF32
Both turbos CHRAs use twin race ball bearing.
Both turbos have P18 turbine A/Rs.
My recommendation would be to keep your existing turbos and improve upon the intial response of the VF26.
This can be achieved by converting the VF26 from sleeve to a ball bearing turbo.Purchase a VF27 and have the CHRA swapped into the VF26.
If you wish to use a VF33 primary the compressor intake can be milled down from 60mm to 50mm and will fit up nicely.This will save swapping the intact out.

[tmh983]

Wow, thats a pretty good answer. So is there any advantages at all to the 32/33? I think subaru used the 32/33 on their sti legacy, so there must be some advantages to them...?

Is it possible to simply get a 27/32 cartridge and bolt onto it the vf26 turbine,compresser and housings? Or is the shafts of the bb vs thrust bearing turbos different?

[zanzarah]

Wow, thats a pretty good answer. So is there any advantages at all to the 32/33? I think subaru used the 32/33 on their sti legacy, so there must be some advantages to them...?

Is it possible to simply get a 27/32 cartridge and bolt onto it the vf26 turbine,compresser and housings? Or is the shafts of the bb vs thrust bearing turbos different?

To improve the rate rise of the VF26 convert to a BB with straight swap of the CHRA (cartridge)from a VF27 only
Alternative to this is a primary VF25 same as a VF26 turbo with a turbine of P12.This would be as good a choice if not better than a VF33 plus easy fit.

[Jimbo]

aw man.. all that time i wasted fitting the 32/33 to my old GTB.

[tmh983]

What about using a vf33 primary and a vf27 secondary combo?

Or would that just be stupid? I have a set of 32/33 turbos here, I could make a BB vf33 using the 32 core?

[zanzarah]

What about using a vf33 primary and a vf27 secondary combo?

Or would that just be stupid? I have a set of 32/33 turbos here, I could make a BB vf33 using the 32 core?

For optimization of the turbos you have, I would swap the VF27 BB core into the VF26 for the primary and use the VF32 secondary.

[Billsy]

zanzaraha are these measurements taken in person or from forum?

Reason i ask is ive looked at them side by side and they looked the same. although maybe its an optical illusion as the intake is bigger?
i didnt have anything to measure them with at the time.

[zanzarah]

zanzaraha are these measurements taken in person or from forum?

Reason i ask is ive looked at them side by side and they looked the same. although maybe its an optical illusion as the intake is bigger?
i didnt have anything to measure them with at the time.

Hand measured using digital calipers.
The turbo codes can also confirm the variation in the compressor wheel inducer size ie: between VF27 and VF33

[Murf B4]

i have a spare GTB black box of solenoids that your going to need with the TT setup LOL , im hearing a VF34 or a TD05 18G will solve your problems

[Mosti]

Stick with the 33/32 combo and have them ported along with the ECV

[BEE004]

Stick with the 33/32 combo and have them ported along with the ECV

where would one go to get this done