Turbo upgrade
27 February 2010, 09:29 PM
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27 February 2010, 09:36 PM
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They both flow about 425 cfm @ 18 PSI. The VF24 sourced from the V4 STi and the VF28 from the V5 STi. If you're looking for the most power out of a bolt on single scroll VF series turbo, try and find yourself a VF22.
27 February 2010, 09:45 PM
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this should give you something to think about lol
IHI turbo.
The VF series (VF22, VF23, VF24, VF29, VF30) 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. .
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 mid range 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 driveability higher than maximum power.
The VF29 & VF30 delivers a very wide increase in torque over the standard TD-series turbos. It is important to note that the VF30 is not a roller bearing turbo.
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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.
more info
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.
IHI turbo.
The VF series (VF22, VF23, VF24, VF29, VF30) 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. .
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 mid range 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 driveability higher than maximum power.
The VF29 & VF30 delivers a very wide increase in torque over the standard TD-series turbos. It is important to note that the VF30 is not a roller bearing turbo.
----------------------------------------------------------------------------------------------------
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.
more info
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.
Last edited by The Stitcher; 27 February 2010 at 09:46 PM.
but thats just me.... go for it mate if your 101% it's a gooden
27 February 2010, 11:20 PM
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Richard what about a VF34? 
These are meant to be the best of the VF single scrolls listed, there are plenty about usually and can make good bhp and spool quicker than the VF22/30 and 35.
I have also read a few reports of the VF22 being a little 'fragile', perhaps it might be worth doing a google search on VF22 failures.
Failing the VF34 then I would go for a VF30 or 35.
These are meant to be the best of the VF single scrolls listed, there are plenty about usually and can make good bhp and spool quicker than the VF22/30 and 35.
I have also read a few reports of the VF22 being a little 'fragile', perhaps it might be worth doing a google search on VF22 failures.
Failing the VF34 then I would go for a VF30 or 35.
28 February 2010, 09:29 AM
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Richard what about a VF34?
These are meant to be the best of the VF single scrolls listed, there are plenty about usually and can make good bhp and spool quicker than the VF22/30 and 35.
I have also read a few reports of the VF22 being a little 'fragile', perhaps it might be worth doing a google search on VF22 failures.
Failing the VF34 then I would go for a VF30 or 35.
These are meant to be the best of the VF single scrolls listed, there are plenty about usually and can make good bhp and spool quicker than the VF22/30 and 35.
I have also read a few reports of the VF22 being a little 'fragile', perhaps it might be worth doing a google search on VF22 failures.
Failing the VF34 then I would go for a VF30 or 35.
28 February 2010, 09:33 AM
#15
i'm running the VF28 on mine it's a great upgrade.... watch you don't get something that will make you do a load of work to the car to support it.
What else are you planning to do along with the turbo, what are you already running there ? check out my profile for a list of engine related mods on mine.
What else are you planning to do along with the turbo, what are you already running there ? check out my profile for a list of engine related mods on mine.
28 February 2010, 10:47 AM
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i'm running the VF28 on mine it's a great upgrade.... watch you don't get something that will make you do a load of work to the car to support it.
What else are you planning to do along with the turbo, what are you already running there ? check out my profile for a list of engine related mods on mine.
What else are you planning to do along with the turbo, what are you already running there ? check out my profile for a list of engine related mods on mine.
28 February 2010, 12:15 PM
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I emailed a few of the sellers of these units on eBay and none would guarantee that they were based on genuine units and guarantee the turbo to increase power.
28 February 2010, 06:51 PM
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Have you thoght about one of these? on Andy F's web site;
AndyForrestPerformance
The TD04 can be setup to produce very early boost but starts to run inefficient at higher rpm if used at higher boost levels. A hybrid version of the TD04 can bridge the performance gap to the Sti turbos but with less lag.
Products
AFP4H – is based on a TD04 this is available new or fully re-manufactured on an exchange basis. It is fitted with a new high efficiency, high flow rate compressor wheel and compressor housing which is capable of maintaining the fast spool up rate typically associated with the TD04 but with the ability to run higher boost efficiently over a wider rpm band. This turbo has been tested to levels in excess of 320lbft and 320bhp. With full boost still coming in as low as 2500rpm on a 2.0
£400 exchange (includes 12 months warranty)
AndyForrestPerformance
The TD04 can be setup to produce very early boost but starts to run inefficient at higher rpm if used at higher boost levels. A hybrid version of the TD04 can bridge the performance gap to the Sti turbos but with less lag.
Products
AFP4H – is based on a TD04 this is available new or fully re-manufactured on an exchange basis. It is fitted with a new high efficiency, high flow rate compressor wheel and compressor housing which is capable of maintaining the fast spool up rate typically associated with the TD04 but with the ability to run higher boost efficiently over a wider rpm band. This turbo has been tested to levels in excess of 320lbft and 320bhp. With full boost still coming in as low as 2500rpm on a 2.0
£400 exchange (includes 12 months warranty)
Last edited by Black-Hawk; 28 February 2010 at 06:54 PM.
28 February 2010, 06:56 PM
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Have you thoght about one of these? on Andy F's web site;
AndyForrestPerformance
The TD04 can be setup to produce very early boost but starts to run inefficient at higher rpm if used at higher boost levels. A hybrid version of the TD04 can bridge the performance gap to the Sti turbos but with less lag.
Products
AFP4H – is based on a TD04 this is available new or fully re-manufactured on an exchange basis. It is fitted with a new high efficiency, high flow rate compressor wheel and compressor housing which is capable of maintaining the fast spool up rate typically associated with the TD04 but with the ability to run higher boost efficiently over a wider rpm band. This turbo has been tested to levels in excess of 320lbft and 320bhp. With full boost still coming in as low as 2500rpm on a 2.0
£400 exchange (includes 12 months warranty)
AndyForrestPerformance
The TD04 can be setup to produce very early boost but starts to run inefficient at higher rpm if used at higher boost levels. A hybrid version of the TD04 can bridge the performance gap to the Sti turbos but with less lag.
Products
AFP4H – is based on a TD04 this is available new or fully re-manufactured on an exchange basis. It is fitted with a new high efficiency, high flow rate compressor wheel and compressor housing which is capable of maintaining the fast spool up rate typically associated with the TD04 but with the ability to run higher boost efficiently over a wider rpm band. This turbo has been tested to levels in excess of 320lbft and 320bhp. With full boost still coming in as low as 2500rpm on a 2.0
£400 exchange (includes 12 months warranty)
28 February 2010, 07:49 PM
#26
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VF34 on my old my99 classic produced 330bhp with STI TMIC, sports cat and associated mods with Bob Rawle ecutek remap.
TD05 16g on my bug produces 336bhp with STI TMIC, full decat and associated mods with Zen ecutek remap.
Both rapid, VF34 cannot be rebuilt/16g can i think. 16g more laggy than VF34 in my experience so would be wary of 18g & even more lag. VF34 had almost zero lag and has more of a whistle on boost than the 16g.
Out of the two I've had the VF34 would get the nod.......just my 2p However, there are many turbos and hybrids out there that suit the 2ltr well, just make sure you don't go too far with the BHP and torque and your engine and box will last a bit longer
TD05 16g on my bug produces 336bhp with STI TMIC, full decat and associated mods with Zen ecutek remap.
Both rapid, VF34 cannot be rebuilt/16g can i think
. 16g more laggy than VF34 in my experience so would be wary of 18g & even more lag. VF34 had almost zero lag and has more of a whistle on boost than the 16g.Out of the two I've had the VF34 would get the nod.......just my 2p
However, there are many turbos and hybrids out there that suit the 2ltr well, just make sure you don't go too far with the BHP and torque and your engine and box will last a bit longer
28 February 2010, 08:26 PM
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VF34 on my old my99 classic produced 330bhp with STI TMIC, sports cat and associated mods with Bob Rawle ecutek remap.
TD05 16g on my bug produces 336bhp with STI TMIC, full decat and associated mods with Zen ecutek remap.
Both rapid, VF34 cannot be rebuilt/16g can i think. 16g more laggy than VF34 in my experience so would be wary of 18g & even more lag. VF34 had almost zero lag and has more of a whistle on boost than the 16g.
Out of the two I've had the VF34 would get the nod.......just my 2p However, there are many turbos and hybrids out there that suit the 2ltr well, just make sure you don't go too far with the BHP and torque and your engine and box will last a bit longer
TD05 16g on my bug produces 336bhp with STI TMIC, full decat and associated mods with Zen ecutek remap.
Both rapid, VF34 cannot be rebuilt/16g can i think
. 16g more laggy than VF34 in my experience so would be wary of 18g & even more lag. VF34 had almost zero lag and has more of a whistle on boost than the 16g.Out of the two I've had the VF34 would get the nod.......just my 2p
However, there are many turbos and hybrids out there that suit the 2ltr well, just make sure you don't go too far with the BHP and torque and your engine and box will last a bit longer 
, they can be rebuilt but only by specialists; as per my VF48 being rebuilt, the spares are only available from IHI dealers and I understand they can be quite a job to overhaul. The VF34 does spool up very quickly and IMO would be the best choice for your car, not as fast as a TD04 hybrid but the VF34 is capable of 370bhp given supporting mods.
As I understand it the TD05 turbos have what Top Gear would call "Barn Door Engineering" being easy to overhaul, upgrade and repair by virtually anyone with mechanical experience (this does not include me).
28 February 2010, 10:22 PM
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The VF34 is a great turbo i had one on my UK car at one point, The VF30 and 35 are also good, the VF2* range r supposed to be more fragile at high boost levels than the newer VF3* range.
370 is very optimistic for a VF34 though, they normally make around 330-340 and ocassionally 350ish.
Best Bang for Buck is probably a VF35 as they are quite common and therefore cheaper than the rarer VF34 (which only came on V7 STI RA's i beleive). A VF35 will typically make around 330ish but spool very quickly.
370 is very optimistic for a VF34 though, they normally make around 330-340 and ocassionally 350ish.
Best Bang for Buck is probably a VF35 as they are quite common and therefore cheaper than the rarer VF34 (which only came on V7 STI RA's i beleive). A VF35 will typically make around 330ish but spool very quickly.
28 February 2010, 11:12 PM
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The VF34 is a great turbo i had one on my UK car at one point, The VF30 and 35 are also good, the VF2* range r supposed to be more fragile at high boost levels than the newer VF3* range.
370 is very optimistic for a VF34 though, they normally make around 330-340 and ocassionally 350ish.
Best Bang for Buck is probably a VF35 as they are quite common and therefore cheaper than the rarer VF34 (which only came on V7 STI RA's i beleive). A VF35 will typically make around 330ish but spool very quickly.
370 is very optimistic for a VF34 though, they normally make around 330-340 and ocassionally 350ish.
Best Bang for Buck is probably a VF35 as they are quite common and therefore cheaper than the rarer VF34 (which only came on V7 STI RA's i beleive). A VF35 will typically make around 330ish but spool very quickly.
It could support more but I am going for a VF48 plus further mods and hope to get 385-390 bhp.