IHI Turbo And TD Information

[Ash007ks]

just incase you want to sticky the information.

 

IHI Turbos



VF22

This turbo has the highest output potential of all of the IHI VF series
turbos and is the best choice for those who are looking for loads of top
end power. The top end power however, does not come without a cost. The
VF22 spools significantly slower than the rest of the IHI models due to
the larger P20 exhaust housing and is much less suited for daily
driving than some of the other models. Although the largest VF series
turbo, the VF22 is not quite optimal for stroked engines or those who
wish to run more than 20PSI of boost.



VF23

This turbo is considered a great all-around turbo. Like the VF22 it
utilizes the largest P20 exhaust housing. This housing is mated with a
smaller compressor housing of the of the VF24. This turbo is considered
optimal in applications with range from mild to slightly wild. It does
not have the same top end power of the VF22, but spools up significantly
quicker.



VF24

This turbo shares its compressor housing with the VF23 however, this
housing is mated with a smaller (P18) exhaust side. The smaller
characteristics of this turbo allow it to provide ample bottom end power
and quick spool. This turbo is very popular for Imprezas with automatic
transmissions and Group N rally cars.



VF28

This turbo came standard on the STi Version 5. In terms of overall size,
it is smaller than the VF22, VF30 and VF34, and about same size as the
VF23.



VF29

This Turbo is nearly identical to the VF24, with the same compressor and
exhaust housings. However the compressor wheel in the VF29 is has been
changed slightly. The changes made to the compressor wheel in this model
are generally viewed as improvements, and as such this unit is
typically chosen over the VF24.



VF30

The VF30 is commonly considered the best bang for the buck turbo in the
IHI VF series line. A relatively new model the VF30 features the same
exhaust housing as the VF24 but a larger compressor side similar to the
VF22. The combination of these two parts results in increased output
potential without the lag associated with the VF22. Although it doesn't
offer the top end supremacy of the VF22, the VF30 is a great compromise
between these unit and the quicker spooling models.



VF34

The VF34 is nearly identical to the VF30, with the same exhaust housing
and compressor. However the VF34 goes back to the ball bearing design,
and in doing so achieves full boost approximately 500RPM sooner than the
comparable VF30. The VF34 is the most recent IHI design and as such
costs slightly more than its counterpart. Top end performance and
maximum output are identical to the 30.



VF35

VF35 The VF35 has identical internals as the VF30 and it uses divided
thrust bearings. However, the exhaust housing is a P15 which means this
turbo will have fantastic spool characteristics. This turbo is standard
on the new WRX Type RA. LIMITED SUPPLY.



VF36

Roller bearing version of the twin scroll VF37, also has a titanium
turbine and shaft for even quicker spool. Same compressor housing as
VF30/34, however twin scroll P25 exhaust housing provides slightly
better top end output due to reduced exhaust pulse interference. This
turbo is good for 400HP and used on JDM STI Spec C from 2003 onwards.



VF37 (thrust bearing)

Enter the age of twin scroll IHI turbos. Same compressor housing as
VF30/34, however has a new twin scroll P25 exhaust housing that provides
slightly better top end output due to reduced exhaust pulse
interference. Twin scroll also provides better spool up for improved low
down response over the VF30/34. This turbo is good for 400HP and used
on JDM STI from 2003 onwards.



VF38

Twin scroll turbo with titanium turbine and shaft. Smaller compressor
housing than VF36/VF37 provides tremendous spool up capabilities but
less top end than VF36/37. The spool capabilities of this turbo are
demonstrated on the JDM Legacy GT, which reaches peak torque at 2400RPM.



VF39

Single scroll turbo used on USDM STI and latest 2.5L STIs released internationally. Smaller than VF30/VF34.



VF42

Exclusive turbo to the S203/S204 models, this features a twin scroll
design with a slightly larger compressor than the VF36/37 turbos and
different turbine design (more blades). The VF42 is a roller-bearing
turbo and is likely of similar size to the VF22 turbo, but with twin
scroll exhaust housing for faster spool and superior top end performance
due to reduced exhaust pulse interference.



TD04L-13T

(390cfm at 14.7psi, 200-275whp, Bolt-On)

This is the standard equipment turbocharger used on the USDM Subaru
Impreza WRX. It can be found on all the current model years from
2002-2007.

Expect to achieve full boost with the proper mods and a quality tune between 2500-3000rpms.



IHI VF10

This is the standard equipment turbocharger used on the USDM Legacy 4EAT MY91-94.



IHI VF11

This is the standard equipment turbocharger used on the USDM Legacy 5MT MY91-94.



IHI VF12

This is the standard equipment turbocharger used on the JDM Legacy RS MY89-93.



IHI VF13

This is the standard equipment primary turbocharger used on the JDM Legacy MY93-95.



IHI VF14

This is the standard equipment secondary turbocharger used on the JDM Legacy MY93-95.



IHI VF18

This is the standard equipment primary turbocharger used on the JDM Legacy MY96.



IHI VF19

This is the standard equipment secondary turbocharger used on the JDM Legacy MY96.



IHI VF20

This is the standard equipment turbocharger used on the JDM Legacy MY97.



IHI VF22

(490cfm at 18.0psi, 250-325whp, Bolt-On)

This is the standard equipment turbocharger used on the JDM V3 Subaru
Impreza WRX and optional on the JDM Subaru Impreza WRX STi 22b. Of all
the IHI models, the VF22 has the largest potential for peak horsepower,
and is capable of supporting the highest boost levels. It is capable of
running up to 25 psi. The VF22 is a roller bearing turbo that utilizes
the P20 exhaust housing.

Expect to achieve full boost with the proper mods and a quality tune
between 3200-3700rpms. 2002-2005 WRX owners will need fuel upgrades for
this turbocharger and proper engine management is highly recommended for
all vehicles.



IHI VF23

(388cfm at 18psi, 250-325whp, Bolt-On)

This is the standard equipment turbocharger used on the JDM Subaru
Impreza WRX STi 22b. The VF23 is a ball bearing turbocharger that
utilizes the P20 exhaust housing like the VF22. This housing is mated
with the smaller compressor housing of the VF24 for fast response and
excellent low and mid-range performance. It does not have the same top
end power of the VF22, but spools up slightly quicker.

Expect to achieve full boost with the proper mods and a quality tune
between 2800-3300rpms. 2002-2005 WRX owners will need fuel upgrades for
this turbocharger and proper engine management is highly recommended for
all vehicles.



IHI VF24

(425cfm at 18psi, 250-325whp, Bolt-On)

This is the standard equipment turbocharger used on the JDM V4 Subaru
Impreza WRX STi. This turbo shares its compressor housing with the VF23,
however, this housing is mated with a smaller (P18) exhaust side. The
smaller characteristics of this turbo allow it to provide ample bottom
end power and quick spool. This turbo is very popular for Imprezas with
automatic transmissions and Group-N rally cars.

Expect to achieve full boost with the proper mods and a quality tune
between 2800-3300rpms. 2002-2005 WRX owners will need fuel upgrades for
this turbocharger and proper engine management is highly recommended for
all vehicles.



IHI VF25

This is the standard equipment primary turbocharger used on the JDM
Legacy B4. Utilizes a thrust-bearing design and a P12 exhaust housing.



IHI VF26

(400cfm at 18psi)

This is the standard equipment primary turbocharger used on the JDM
Legacy B4. Utilizes a divided thrust-bearing design and a B14 exhaust
housing.



IHI VF27

(420cfm at 18psi)

This is the standard equipment secondary turbocharger used on the JDM
Legacy. Utilizes a ball-bearing design and a P18 exhaust housing.



IHI VF28

(425cfm at 18psi, 250-325whp, Bolt-On)

This is the standard equipment turbocharger used on the JDM V5 Subaru Impreza WRX STi.

Expect to achieve full boost with the proper mods and a quality tune
between 2800-3300rpms. 2002-2005 WRX owners will need fuel upgrades for
this turbocharger and proper engine management is highly recommended for
all vehicles.



IHI VF29

(425cfm at 18psi, 250-325whp, Bolt-On)

This is the standard equipment turbocharger on the JDM V6 Subaru Impreza
WRX STi. The VF29 is nearly identical to the VF24, with the same
compressor and exhaust housings. However, the compressor wheel in the
VF29 has been changed slightly. The changes made to the compressor wheel
in this model are generally viewed as improvements, and as such, this
unit is typically chosen over the VF24. Has a different location for the
pressure hose on the wastegate actuator.

Expect to achieve full boost with the proper mods and a quality tune
between 2900-3300rpms. 2002-2005 WRX owners will need fuel upgrades for
this turbocharger and proper engine management is highly recommended for
all vehicles.



IHI VF30

(460cfm at 18psi, 250-325whp, Bolt-On)

This is the standard equipment turbocharger used on the JDM V7 Subaru
Impreza WRX STi. The VF30 is a thrust-bearing turbo that utilizes the
P18 exhaust housing of a VF24 and the compressor housing sized between a
VF23 and a VF22.

Expect to achieve full boost with the proper mods and a quality tune
between 3000-3500rpms. 2002-2005 WRX owners will need fuel upgrades for
this turbocharger and proper engine management is highly recommended for
all vehicles.



IHI VF31

Utilizes a P11 exhaust housing.



IHI VF32

This is the standard equipment primary turbocharger used on the JDM Legacy. It utilizes a ball-bearing design.



IHI VF33

This is the standard equipment primary turbocharger used on the JDM
Legacy. It utilizes a P11 exhaust housing and a divided thrust-bearing
design.



IHI VF34

(460cfm at 18psi, 250-325whp, Bolt-On)

This is the standard equipment turbocharger used on the JDM V7 Subaru
Impreza WRX STi Spec-C. The VF34 is nearly identical to the VF30 but has
improved spool up due to its roller bearing design. It also utilizes a
P18 exhaust housing.

Expect to achieve full boost with the proper mods and a quality tune
between 3000-3500rpms. 2002-2005 WRX owners will need fuel upgrades for
this turbocharger and proper engine management is highly recommended for
all vehicles.



IHI VF35

(425cfm, 250-325whp, Bolt-On)

This is the standard equipment turbocharger used on the JDM Subaru
Impreza WRX. The VF35 is similar to the VF34. It utilizes the same
compressor housing and the same compressor inducer size. The differences
are in the divided thrust-bearing design and the P15 exhaust housing.
This allows the VF35 to spool slightly quicker than the VF34 at the cost
of less top-end performance.

Expect to achieve full boost with the proper mods and a quality tune
between 2800-3300rpms. 2002-2005 WRX owners will need fuel upgrades for
this turbocharger and proper engine management is highly recommended for
all vehicles.



IHI VF36

(430cfm, 250-325whp, Modification Required)

This is the standard equipment turbocharger used on the JDM V8-V9 Subaru
Impreza WRX STI Spec-C Type RA. The VF36 is a twin-scroll turbocharger
that utilizes a ball bearing design, a P25 exhaust housing, and Titanium
(possibly TiAl?) compressor wheel for improved spool. It is essentially
a fast spooling VF34.

Expect to achieve full boost with the proper mods and a quality tune
between 2800-3300rpms. 2002-2005 WRX owners will need fuel upgrades for
this turbocharger and proper engine management is highly recommended for
all vehicles.



IHI VF37

(430cfm, 250-325whp, Modification Required)

This is the standard equipment turbocharger used on the JDM V8-V9 Subaru
Impreza WRX STI. The VF37 is a twin-scroll turbocharger that utilizes a
thrust bearing design and a P25 exhaust housing. It is essentially a
fast spooling VF30.

Expect to achieve full boost with the proper mods and a quality tune
between 2800-3300rpms. 2002-2005 WRX owners will need fuel upgrades for
this turbocharger and proper engine management is highly recommended for
all vehicles.



IHI VF38

The VF38 is a twin-scroll that utilizes a Titanium turbine and shaft.
This turbocharger yields tremendous spool-up but offers less top-end
than the VF36/VF37. The spool capabilities of this turbo are
demonstrated on the JDM Legacy GT, which reaches peak torque at 2400RPM.



IHI VF39

(250-325whp, Bolt-On)

This is the standard equipment turbocharger used on the USDM Subaru
Impreza WRX STI. It can be found on all model years from 2004-2006. The
VF39 utilizes a thrust bearing design and the P18 exhaust housing.

Expect to achieve full boost with the proper mods and a quality tune
between 3000-3500rpms. 2002-2005 WRX owners will need fuel upgrades for
this turbocharger and proper engine management is highly recommended for
all vehicles that utilize this turbo aftermarket. Though they are prone
to cracking, VF39’s can be had for very cheap if bought used.



IHI VF40

This is the standard equipment turbocharger used on the USDM Subaru
Legacy GT. It can be found on all the current model years from
2005-2006.

Deadbolt Upgrade



IHI VF41

This is the standard equipment turbocharger used on the JDM Subaru Forester STI. It utilizes a P18 exhaust housing.



IHI VF42

This is the standard equipment turbocharger used on the JDM Subaru
Impreza WRX STi S203 and S204. The VF42 features a twin-scroll design
with a slightly larger compressor than the VF36/VF37 turbos and
different turbine design (more blades). The VF42 is a roller-bearing
turbo and is similar in size to the VF22 turbo, but the twin-scroll
exhaust housing yields faster spool-up and a superior top-end.



IHI VF43

(250-325whp, Bolt-On)

This is the standard equipment turbocharger used on the MY07 USDM Subaru
Impreza WRX STI. It can be found on both base STI's and STI Limited's.
The VF43 utilizes a thrust bearing design and the P18 exhaust housing.
The primary difference between the VF43 and the VF39 used previously on
STI's seems to be the stiffness of the wastegate. The VF43 has a stiffer
wastegate designed to reduce boost creep issues. Info

Expect to achieve full boost with the proper mods and a quality tune
between 3000-3500rpms. 2002-2005 WRX owners will need fuel upgrades for
this turbocharger and proper engine management is highly recommended for
all vehicles that utilize this turbo aftermarket.

[Jay762]

Lots of great info there Ash - thanks

[KG Tuning]

What TD models are found on Subarus just TD05 and TD04? 

[stants]

Theres also a smaller one fitted to some 1st gen uk foresters. Think it's a td series but a bit unsure

[savage bulldogs]

Im not a 100 % but i Think the early foresters have a tdo3

early impreza's (v1&v2) have either a tdo4 or tdo5 top entry

v3 onwards classic impreza's have front entry , tdo4's on uk's and wrx's but vf series on the sti versions

All newage impreza's have front entry turbos with either Tdo4's , Tdo5's and vf series .The latter either comes in single scroll or twin scroll depending on the year/ model

[KG Tuning]

I think the early STI's did have a TD05 and Newage WRX's only had the TD04. I think some of the early EVO's might have run a TD05 too. 

 

Anyone know what the quickest spooling single scroll aftermarket turbo is for the Impreza that supports up to 350bhp? 

 

I like my TD05 but it's dead below 3500. 

[stants]

Ever looked into hybrids ? Have a look here

http://www.andyforrestperformance.co.uk/16307.html

[KG Tuning]

Not sure if it's a rumour or not but apparently the company who makes Andy's Hybrids for him has gone bust. 

 

I bet a 310bhp WRX with an Hybrid TD04 is a whole lot of fun on the road. Full boost at 2500rpm!!!

[stants]

Boo [emoji35] I was following a van for a company based in leeds thw other day that said they did hybrids amongst others.

It's something that's on the wishlist thats as long as my arm.

[savage bulldogs]

The popular choice stock location turbo is the vf 34 as roller bearing turbos will spool quicker Ash had some good results with his . i don't think they hold the boost as well higher up in the rev range as the tdo5 16g though.

Have you got any other mods , headers , de catted upipe/downpipe ?

mine isn't running right atm :-(

But my tdo5 still hits 1bar @ 2.8 k on the road

tbh id love a sc42 billet or equivalent md series turbo but haven't got a spare £1.5k :-(

[KG Tuning]

I'm running 1.35bar and it's making 1bar by 3800rpm full boost at 4200rpm

 

Running decat up-pipe, sports cat and decat centre, All 3" from turbo back though. 

 

Car has pretty poor compression too that won't help.

 

I've noticed on my graph that my TD05 holds better than VF34 charts, it drops from 19.5 psi to 17psi, seen some VF's go from 22psi to nearly 15psi. 

[savage bulldogs]

Mine hits 1bar @ 3.2k on the rollers which is 400 rpm later than when underload on the road but I have got sti cams, gruppe headers/4 bolt upipe , reversed inlet and a few engine mods .

I'd be a bit dubious of trying to squeeze more power until you've investigated the reason for the low compression though bud

[KG Tuning]

The Tuner diagnosing wasn't sure what caused the low compression par se but he did say part of a spark plug tip was broke off. He said botched wiring caused injector interference and that the map was rich on idle. Bore wash! 

 

I'm happy with 330hp. Further mods will target WHP only. 

 

One thing I did notice is that the car was making 1bar before the remap and also making it at 3800rpm. The interesting bit is that I had no restrictor pill. The scary part is my last 3 mappers all told me they were aiming for circa 1.4bar and none of them told me they couldn't achieve it!!!!!! They must just set wastegate duty and presume the car will make the boost??