Hunting around for a VF35 turbo upgrade for my blob WRX but have been offered a VF28 for a really good price, so, what are the main differences between the two, has anyone fitted a 28 to their new-age and general opinions?!

 

VF28 is generally great turbo and mainly spooly,but 15 years old which has been found on Classic,usually will make 330bhp with supported mods

VF35 is newer turbo and usually will make with supported mods around 330-350bhp.

I would have look for VF35 usually you will find them too for good price.

Jura

 

Thanks Jura, if there is one opion I trust it's yours lol Think I'll hold out..

 

I went through a similar exercise.
I eventually plumped for a VF35, but I've seen identical power to mine made on a VF28.
Ultimately, if you're buying second hand a lot will depend on how good the part you're buying is, together with your car and the person mapping it - every one is different, and each mapper will probably have their own safety margins etc etc.

The VF35 is a good compromise for a daily driver, as it gives you similar spool characteristics to a TD04 with more middle and top end power, but it wasn't quite as "explosive" as I'd expected it to be - which I think is why a lot of people go for a TD05 18G - in which case the car's more than likely to get over 350bhp without too much problem!

My VF35 made 328bhp with NGK 6's and the other usual accompanyments, although we think the up pipe had a split in it and was blowing slightly.
My specialist replaced it with a Hayward and Scott item, and fitted NGK 7's, only to find I'd lost 15bhp - it further discussions with my mapper and the specialist would seem to indicate the wider bore of the H&S item is the cause of the drop.
For this reason, I've just managed to source a Harvey up pipe, which is due to be fitted next week.
My mapper reckons it should hopefully make nearly 340 on this setup based on previous runs, which isn't bad for a bug.

 

Good answer! Defo going to stick to my guns with a 35. Not going for mad power, up to 330bhp great as daily driver.. the hunt continues..

 

the VF48 is a cracking turbo aswell but they are a bit expensive and harder to find.

 

But will be very laggy on WRX without the AVCS.Rather VF34 or VF35,these both turbos are best for WRX




Jura

 

Currently negotiating a 35, will find out tonight if I've got it..

 

VF24, is also a good turbo.

Very quick spool, and I made 344 on it.

Just another one to consider.

 

Just a little bit of info for you, i found this on another site.

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 highes 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. 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 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 P15 exhaust housing. The difference between the VF43 and the VF39 used previously on STI's is the size of the wastegate. The VF43 has a larger wastegate designed to reduce boost creep issues.
Expect to achieve full boost with the proper mods and a quality tune between 3000-3500rpms

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 2005-2007.


IHI VF41
This is the standard equipment turbocharger used on the JDM Subaru Forester STI. It utilizes a P18 exhaust housing.

 

If only I had a pound for every time I saw this post!
Whilst useful, the only problem with that is nearly every entry says the same thing - the first paragraph is definitely a bit handier! Oh - and VF35's are "rare" .

It would be really handy if someone in the know were to post a realistic power bracket for each turbo, together with spool characteristics vs other turbos, and increase the first section to include the later turbos (30 on)

Just FYI, a VF28 will probably get you the same figures you're after, and is supposed to be a little quicker bottom to mid than a VF35 although it'll be marginal. VF35 supposedly has more top end.

I know Harvey also supplies TD05 18G's - just throwing a few more options out there for you

 

+1

and i have 1 which will up for grabs soon its on for sale section

 

Excellent replies Gents, now feel suitably clued up! Went for the 35 in the end, collecting in a few weeks..

 

I have just bought a VF48 off S10WRC and I have a ported low miler VF35 if that deal falls through if interested pm me