Author Topic: VF Turbo Info  (Read 10030 times)

August 17, 2011, 01:59:23 PM
Read 10030 times

Stev0

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The VF series (VF22, VF23, VF24, VF29, VF30, VF34, VF39) are the most common direct replacement turbos. All VF-series turbochargers use the same roller bearing, water-cooled core assembly. The differences are in their wheels and housings to achieve different flows.

The VF22 has the largest potential for peak horsepower. In other words, in the IHI model range, the VF 22 supports the highest boost levels. It is capable of running up to 25 psi. Because it is a roller bearing turbo, turbo lag is minimal...the boost comes on around 3300 rpm. Expect to max out the VF22 somewhere in the 400-450 hp range.

The VF23 starts the middle ground. It comes on boost around 3100 rpm and is capable of running 20 psi of boost. Expect to max out the VF23 somewhere in the 300-350 hp range.

The VF 24 starts to come on around 2900 rpm and will significantly improve power through the midrange over the stock TD04 turbo. However, the VF 24 is only capable of running around 17 psi.

The VF23 and VF 24 are a great replacement for those who value drivability higher than maximum power.

The VF29 & VF30 delivers a very wide increase in torque over the standard TD-series turbos.

The VF 30 is a fairly new IHI model that utilizes the exhaust housing of a VF24 and the compressor housing sized between a VF 23 and a VF 22. It comes on boost down low (around the 3000 rpm range). With upgraded injectors, fuel pump, and engine management, the VF 30 is good for 365-390 horsepower. It is important to note that the VF30 is NOT a roller bearing turbo.

The IHI VF34 (which comes standard in the Japanese market STi version "RA") is a new roller bearing turbo. It has the same specifications (compressor size, etc.) as the VF 30. The difference lies in the roller bearing which, theoretically, allows quicker spool and better response. It costs a couple hundres more than a VF 30. The VF 34 maxes out around 365-390 hp. It is probably the most popular option for big turbos on the WRX.

One other turbo to note is the VF 39...it comes standard in the USDM STi. While we don't have all the specs yet, these are a new roller bearing, TWIN SCROLL design. Performance numbers are pretty similar to the VF34...maxing out just under 400 hp.

A new high performance modified IHI turbo has made its way to the market recently. They are the Power Enterprises PE 1818 and the 1820. The 1818 supposedly comes on boost extremely fast...which make it great for road racing or aggressive driving (remember to be responsible :^). The 1818 maxes out somewhere between 350-375 hp.

The 1820 is larger than the 1818 and is capable of running more boost, but at the expense of more turbo lag. Expect it not attain full boost until you have passed 4000 rpm. However, it can be tuned to 400+ hp.



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.
Jeep Commander CRD - GDE Hot Tune
ex Prodrive Xt, X, XT, WRX STI, Outback 3.0R

August 18, 2011, 08:54:29 AM
Reply #1

Manfred

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Hmmm, interesting.
I would fall into this category:
  "The VF23 and VF 24 are a great replacement for those who value drivability higher than maximum power."
I find the TD04 runs out of steam from about 5K rpm.
Not like there is much more revs anyway, but would still be great if it used it all.
Pretoria

2011 XT Sportshift
2013 Ford Fiesta Ecoboost (Turbo Triple)

August 18, 2011, 08:58:29 AM
Reply #2

Manfred

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What do the guys usually swap the std one with..?
Pretoria

2011 XT Sportshift
2013 Ford Fiesta Ecoboost (Turbo Triple)

August 18, 2011, 09:04:27 AM
Reply #3

Stev0

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vf35/39 is the easiest to come by. They are directly from the STI's.
Jeep Commander CRD - GDE Hot Tune
ex Prodrive Xt, X, XT, WRX STI, Outback 3.0R

August 18, 2011, 09:19:23 AM
Reply #4

Manfred

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I'm sure I read somewhere that the housings tend to crack.
Do the new STI's still use the VF's
Pretoria

2011 XT Sportshift
2013 Ford Fiesta Ecoboost (Turbo Triple)

August 18, 2011, 09:53:09 AM
Reply #5

Stev0

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yep the new cars still use the vfs

I would go with a td05h16g-20g depending on how much power you want. They are cheaply rebuildable with ample parts. The Vf's are bolt on though, with the exception that you have to retune.
Jeep Commander CRD - GDE Hot Tune
ex Prodrive Xt, X, XT, WRX STI, Outback 3.0R

August 18, 2011, 09:56:06 AM
Reply #6

Manfred

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Well then the VF's cant be that bad then.

TD05, I understand that, I'm just having a problem with the Greek after that.
My first turbo car, I can only speak TD04   ;D
Pretoria

2011 XT Sportshift
2013 Ford Fiesta Ecoboost (Turbo Triple)

August 18, 2011, 10:05:31 AM
Reply #7

Stev0

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The most popular TDO5s are the 16g, 18g, 20g, hence the tdo5h16g-20g :P

The tdo4 is capable of making 200kw - 410nm  more than enough!
Jeep Commander CRD - GDE Hot Tune
ex Prodrive Xt, X, XT, WRX STI, Outback 3.0R

August 18, 2011, 10:17:11 AM
Reply #8

Manfred

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so what does the 16G-20G part do..?
Pretoria

2011 XT Sportshift
2013 Ford Fiesta Ecoboost (Turbo Triple)

August 18, 2011, 10:39:13 AM
Reply #9

Stev0

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Thats the size of the compressor wheel. 16g is smaller than the 20g. The turbo housing is the tdo4/5/6 part. Higher number is a bigger "looking" turbo
Jeep Commander CRD - GDE Hot Tune
ex Prodrive Xt, X, XT, WRX STI, Outback 3.0R

August 18, 2011, 10:48:39 AM
Reply #10

Manfred

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So the smaller the compressor wheel, the less pressure it will generate
Pretoria

2011 XT Sportshift
2013 Ford Fiesta Ecoboost (Turbo Triple)

August 18, 2011, 01:04:27 PM
Reply #11

Stev0

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No, pressure is controlled by the wastegate. Bigger turbos blow or flow more air. Sort of like a hair dryer.

a tdo4 can boost 3.1bar (we've done it) but a tdo5 boosting 3.1bar will flow much more air and make more power.

For example, a tdo4l on our cars boosts .8bar and makes 169kw. you should be able to make the same power with a vf35 boosting only .5bar, make sense?
Jeep Commander CRD - GDE Hot Tune
ex Prodrive Xt, X, XT, WRX STI, Outback 3.0R

August 18, 2011, 01:25:44 PM
Reply #12

Manfred

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Ok, I get now.
Probably more reliable as well, less heat
Pretoria

2011 XT Sportshift
2013 Ford Fiesta Ecoboost (Turbo Triple)

August 18, 2011, 06:14:03 PM
Reply #13

Stev0

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Exactly. Car might start boosting abit later though, about 2-300rpm before you get to max power, but its said that it makes the car more drivable and lighter on fuel.
Jeep Commander CRD - GDE Hot Tune
ex Prodrive Xt, X, XT, WRX STI, Outback 3.0R

March 07, 2012, 10:12:30 AM
Reply #14

Deon

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steve, were can we get td 05 turbo's, even a rebuilt unit ?
and at what price